Influence of rolling connection rays of mechanical parts and manual rolling equipment

SIcircRBU NICOLAE 1 LIHTEŢCHI IOAN2 SORIN VLASE2 GHEORGHE VASILE2 NICOARA DUMITRU2 LUMINITA SCUTARU2

1)SC INAR SA BraşovStr Poienelor nr 5 Braşov

ROMANIAnica_sirbuyahoocom httpwwwinarbvrdsbvro

2)Transilvania University of BraşovB-dul Eroilor nr 29 Braşov

ROMANIAlihtetchiunitbvro httpwwwunitbvroitgdgt

Abstract - The present paper describes a simple manual device to roll connecting rays To determine the effectiveness of rays connection using the rolling method we used tests with two spindle on a stand having the following test procedure a spindle with an unrolled connection ray and a spindle with a rolling connection ray using a manual device made in SC INAR SA Brasov The rolled spindle had a significant increase in durability (double the spindle without rolling)The efficiency of this rolling operation and the manual rolling device may be the necessary support to make decisions of cold mechanical treatment on parts manufactured in small volumes and there is no cost to import special rolling devices of connection rays

Key-Words - Roll rolling radius rolling equipment fatigue resistence durability system application

1 IntroducereFatigue breaking of mechanical parts used during variable time periods is produced in high stress areas where there are construction or technological factors producing cracks Power concentrator called radius conection has a negative influences to the fatigue resistance more so since the change of section is larger and conection radius is smaller If you can not modify the geometry section it may be possible to use mechanical surface treatments such as roll with roller or bal jet shot hardening etc These treatments are based on the principle of inducing compressive residual tensions in the surface layerIn this paper we present - A manual rolling equipment designed and manufactured in the laboratory of the institute - Roll of radius conection of a spindle truck with this device and - The fatigue attempt for two spindle at the same level of demand one with rolling radius the second without rolling radius to determine efficiency

2 A manual rolling equipment of radius conection

The rolling opperation using the equipment must have the following functions - Support component (to a mechanical part of roll)

- Supporting rollers - Roll force development in a closed chain of forces - Producing a relative movement between the roller and the conection radiusFigure 1 presents the rolling equipment mounted on the servohidraulic cylinder machine with four columns The device ensures the arrangement of the rolled forces in closed chain

Fig 1

Figure 2 shows the roller equipment in the close chain of forces (the rollers are in contact with the radius of the

Recent Researches in Manufacturing Engineering

978-960-474-294-3 207

spindle) The servohydraulic cylinder provides the force necessary for rolling The cylinder rod is rotated to ensure the rolling of rolls is pressed on the conection radiusThe equipment manufactured in the laboratory consists of portable roller device rolls device of fixing components (parts)

Fig 2

The equipment shall- angle required between roll and component- adjustement and movement of rolls to the diameter of arrangement of connection radius- roll of rolls over rolling surface In Fig 3 shows the overall design of the device port rollers This device provides- fixing support rolls- angle of inclination of the rollers 300 about the axis of the component- rolls position adjustment of connection radius diameters between 44 mm and 80 mm

Fig 3

The rolling opperation can be achieved in two ways- port device roller rotates and the machine component is fixed on the crosspiece- the device is placed on crosspiece machine and it is rotate the component

3 Rolling method and program for fatigue test of spindleTo determine the processing parameters and emphasize efficiency of rolling spindles following steps- rolling of a spindle using equipment made with existing devices and laboratory equipments- recording and analysis rolling parameters made on the spindle connection radius- the fatigue test on a stand of a rolled spindle at a higher application unlimited fatigue endurance limit (σ-1)- the fatigue test on a stand of a rolled spindle at the same level of request- comparative analysis of test results

31 Rolling method and rolling opperation311 Initials dimensional measurementThe connection radius was measure for the two spindles proposed for research still numbered 1 and 2 (1 - spindle with unrolled radius and 2 ndash with rolling radius) Rays have a deviation from the theoretical radius R15 (125 mm for spindle no 113 mm for spindle no 2)In Fig no 4 spindle 1 radius is presented (R = 125 mm) In Fig No 5 spindle 2 radius is presented (R = 130 mm) Connection radius were measured with a profile projector PHA 14 (MITUTOYO) 00010 Precision class 00010H

Fig 4

Fig 5

Recent Researches in Manufacturing Engineering

978-960-474-294-3 208

312 Rolling opperation and rolling parameters

In principle there are two rolling techniques - deep rolling- combustion rolling surface

To roll the connecting radius of the spindle no 2 was chosen deep rolling technique where depth of residual tension which can reach up to 22 mmIn Fig 6 is a schematic diagram of the forces that occur in connection with rolling radius Distinguish

F - pressure on the rolls device portF1 - pressure on the rollsR -r eaction in the closed rolls chain α - angle of the roll to the spindle axisF = F1 n cos α where n = 3 (number of rolls)

Fig 6

To achieve the radius of connection they have established the following parameters- number of rolls 3- arrangement of the rollers diameter 70 mm- angle between rolls and axle spindle 300- radius of rolls 10 mm- radius of the spindle 13 mm- pressure on roll 40 kN- pressure on the device 1039 kN- number of rotations of the device 46 mm

The rolling opperation was achieved by gradually increasing force up to 13 of the maximum force of pressure while achieving a number of 6-7 turns of the roller device port Further employment growth has been achieved and performing to the maximum set of 36 rotations of the rolls device port The last step was done by descreasing rolling pressing force to 0 while making a number of 3 rotations of the device It mentions that the rotation device was carried out manuallyFig 7 presents the profile of connection radius after rolling the spindle The new radius is 10 mm footprint and depth is 08 to 09 mm Rolling surface looks like a ray connecting rectified

Fig 7

In Fig 8 is presented the spindle no 2 with rolled connection radius

Fig 8

32 Fatigue test of spindles321 Setting test systemFig 9 shows the chart corresponding to spindles materialThis material is 40Cr 10X

Fig 9

To draw this diagram are required mechanical characteristics of the material the concentration factor and Smith formula

Recent Researches in Manufacturing Engineering

978-960-474-294-3 209

2 KSSSS fama (1)

Sa - stress amplitude value in daNmm2Sm - average effort value daNmm2Sf - the material fatigue limit daNmm2K - concentration factorTo assess the fatigue behavior of spindle roolled the nonrolled spindle choose test system placed in the chart area in which to initiate and propagate cracks in the test piece The note chart test procedure A corresponding to an average of 23 daNmm2 effort So the test regime for the two spindle has the following parameters- fmin = 5 kN with σmin DaNmm2 = 149- Fmed = 80 kN with σmed DaNmm2 = 2378- Fmax = 155 kN with σmax DaNmm2 = 46- pulsating load cycles 0 - max Fatigue test was performed on a stand equipped with a cylinder servohidraulic that develops a maximum force 400kN hydraulic aggregate of 130 lmin and as command and control cabinetIn Fig 10 is presented the test stand

Fig 10

322 Fatigue tests resultsNo 1 spindle with unrolled radius has withstood a number of 950 000 cycles at which rupture occurred in radius No 2 spindle with rolled radius made a total of 198 million cycles to crack in the radius of the connection radius The literature indicated an increase of 15 to 2 rolled sustainability component Increasing spindle sustainability following attachment rolling radius was 100 (twice above unrolled spindle)

4 ConclusionsAccelerated testing regime of spindles on the stand was similar to the regime of crossing barriers in very harsh operating conditions No 1 spindle with unrolled radius has limited durability to fatigue during normal operationFor any component required in a bench trial basis the maximum stress is close to the fatigue stress () and must

withstand a number of approximately 2 x 106 cycles applicationNo 2 spindle with rolled radius withstood the fatigue 198 x 106 cycles to failureIn this case we conclude that the spindle rolled radius has unlimited durability in normal operating conditionsBased on the results of comparative tests on the stand designs for simple rolling equipment can be made to provide a range of components manufactured in small series

ACKNOWLEDGEMENT1 This paper is supported by the Sectoral Operational Programme Human Resources Development (SOP HRD) financed from the European Social Fund and by the Romanian Government under the contract number POSDRU8915S59323 ACKNOWLEDGEMENT2 This paper is supported by the Sectoral Operational Programme Human Resources Development (SOPHRD) financed from the European Social Fund and by the Romanian Government under the contract number POSDRU8815S5932 amp POSDRU615S6

References[1] Bobancu Ş Creativitate şi inventică suport curs PDF Universitatea ldquoTransilvaniardquo din Braşov[2] Boleanţu L Rezistenţa materialelor volI Institutul Politehnic Timişoara 1973[3] Buzdugan Gh Rezistenţa materialelor Editura Academiei Bucureşti 1986[4] Chiru A Marincaş D Tehnologii speciale de fabricare şi reparare a autovehiculelor Universitatea ldquoTransilvaniardquo din Braşov 1991[5] Comănescu A şa Mecanica rezistenţa materialelor şi organe de maşini Editura Didactică şi Pedagogică Bucureşti 1982[6] Drăghici I şa Icircndrumar de proiectare icircn construcţia de maşini volII EdTehnică Buc 1982[7] Fuchs V Metal fatigue in Engineering John Willey 1980[8] Moraru V şa Maşini unelte speciale Editura Didactică şi Pedagogică Bucureşti 1982[9] Rădulescu R şa - Fabricarea pieselor auto şi măsurări mecanice Editura Didactică şi pedagogică Bucureşti 1983[10] Revista SAE Fatigue Design Handbook 1976[11] Sicircrbu N şi col - Analiza din punctul de vedere al fenomenului de deteriorare la oboseală la elementele portante ale autovehiculelor Conferinţa InternaţionalăCONAT 1996 Universitatea Transilvania Braşov 1996[12] Sokolovski V Teoria plasticităţii Editura tehnică Bucureşti 1963[13] Vasu O Elaborarea unor metodologii de icircncercare pe standuri hidrosimulative a componentelor de autovehicule Arhivă SC INAR SA Braşov 1993

Recent Researches in Manufacturing Engineering

978-960-474-294-3 210

spindle) The servohydraulic cylinder provides the force necessary for rolling The cylinder rod is rotated to ensure the rolling of rolls is pressed on the conection radiusThe equipment manufactured in the laboratory consists of portable roller device rolls device of fixing components (parts)

Fig 2

The equipment shall- angle required between roll and component- adjustement and movement of rolls to the diameter of arrangement of connection radius- roll of rolls over rolling surface In Fig 3 shows the overall design of the device port rollers This device provides- fixing support rolls- angle of inclination of the rollers 300 about the axis of the component- rolls position adjustment of connection radius diameters between 44 mm and 80 mm

Fig 3

The rolling opperation can be achieved in two ways- port device roller rotates and the machine component is fixed on the crosspiece- the device is placed on crosspiece machine and it is rotate the component

3 Rolling method and program for fatigue test of spindleTo determine the processing parameters and emphasize efficiency of rolling spindles following steps- rolling of a spindle using equipment made with existing devices and laboratory equipments- recording and analysis rolling parameters made on the spindle connection radius- the fatigue test on a stand of a rolled spindle at a higher application unlimited fatigue endurance limit (σ-1)- the fatigue test on a stand of a rolled spindle at the same level of request- comparative analysis of test results

31 Rolling method and rolling opperation311 Initials dimensional measurementThe connection radius was measure for the two spindles proposed for research still numbered 1 and 2 (1 - spindle with unrolled radius and 2 ndash with rolling radius) Rays have a deviation from the theoretical radius R15 (125 mm for spindle no 113 mm for spindle no 2)In Fig no 4 spindle 1 radius is presented (R = 125 mm) In Fig No 5 spindle 2 radius is presented (R = 130 mm) Connection radius were measured with a profile projector PHA 14 (MITUTOYO) 00010 Precision class 00010H

Fig 4

Fig 5

Recent Researches in Manufacturing Engineering

978-960-474-294-3 208

312 Rolling opperation and rolling parameters

In principle there are two rolling techniques - deep rolling- combustion rolling surface

To roll the connecting radius of the spindle no 2 was chosen deep rolling technique where depth of residual tension which can reach up to 22 mmIn Fig 6 is a schematic diagram of the forces that occur in connection with rolling radius Distinguish

F - pressure on the rolls device portF1 - pressure on the rollsR -r eaction in the closed rolls chain α - angle of the roll to the spindle axisF = F1 n cos α where n = 3 (number of rolls)

Fig 6

To achieve the radius of connection they have established the following parameters- number of rolls 3- arrangement of the rollers diameter 70 mm- angle between rolls and axle spindle 300- radius of rolls 10 mm- radius of the spindle 13 mm- pressure on roll 40 kN- pressure on the device 1039 kN- number of rotations of the device 46 mm

The rolling opperation was achieved by gradually increasing force up to 13 of the maximum force of pressure while achieving a number of 6-7 turns of the roller device port Further employment growth has been achieved and performing to the maximum set of 36 rotations of the rolls device port The last step was done by descreasing rolling pressing force to 0 while making a number of 3 rotations of the device It mentions that the rotation device was carried out manuallyFig 7 presents the profile of connection radius after rolling the spindle The new radius is 10 mm footprint and depth is 08 to 09 mm Rolling surface looks like a ray connecting rectified

Fig 7

In Fig 8 is presented the spindle no 2 with rolled connection radius

Fig 8

32 Fatigue test of spindles321 Setting test systemFig 9 shows the chart corresponding to spindles materialThis material is 40Cr 10X

Fig 9

To draw this diagram are required mechanical characteristics of the material the concentration factor and Smith formula

Recent Researches in Manufacturing Engineering

978-960-474-294-3 209

2 KSSSS fama (1)

Sa - stress amplitude value in daNmm2Sm - average effort value daNmm2Sf - the material fatigue limit daNmm2K - concentration factorTo assess the fatigue behavior of spindle roolled the nonrolled spindle choose test system placed in the chart area in which to initiate and propagate cracks in the test piece The note chart test procedure A corresponding to an average of 23 daNmm2 effort So the test regime for the two spindle has the following parameters- fmin = 5 kN with σmin DaNmm2 = 149- Fmed = 80 kN with σmed DaNmm2 = 2378- Fmax = 155 kN with σmax DaNmm2 = 46- pulsating load cycles 0 - max Fatigue test was performed on a stand equipped with a cylinder servohidraulic that develops a maximum force 400kN hydraulic aggregate of 130 lmin and as command and control cabinetIn Fig 10 is presented the test stand

Fig 10

322 Fatigue tests resultsNo 1 spindle with unrolled radius has withstood a number of 950 000 cycles at which rupture occurred in radius No 2 spindle with rolled radius made a total of 198 million cycles to crack in the radius of the connection radius The literature indicated an increase of 15 to 2 rolled sustainability component Increasing spindle sustainability following attachment rolling radius was 100 (twice above unrolled spindle)

4 ConclusionsAccelerated testing regime of spindles on the stand was similar to the regime of crossing barriers in very harsh operating conditions No 1 spindle with unrolled radius has limited durability to fatigue during normal operationFor any component required in a bench trial basis the maximum stress is close to the fatigue stress () and must

withstand a number of approximately 2 x 106 cycles applicationNo 2 spindle with rolled radius withstood the fatigue 198 x 106 cycles to failureIn this case we conclude that the spindle rolled radius has unlimited durability in normal operating conditionsBased on the results of comparative tests on the stand designs for simple rolling equipment can be made to provide a range of components manufactured in small series

ACKNOWLEDGEMENT1 This paper is supported by the Sectoral Operational Programme Human Resources Development (SOP HRD) financed from the European Social Fund and by the Romanian Government under the contract number POSDRU8915S59323 ACKNOWLEDGEMENT2 This paper is supported by the Sectoral Operational Programme Human Resources Development (SOPHRD) financed from the European Social Fund and by the Romanian Government under the contract number POSDRU8815S5932 amp POSDRU615S6

References[1] Bobancu Ş Creativitate şi inventică suport curs PDF Universitatea ldquoTransilvaniardquo din Braşov[2] Boleanţu L Rezistenţa materialelor volI Institutul Politehnic Timişoara 1973[3] Buzdugan Gh Rezistenţa materialelor Editura Academiei Bucureşti 1986[4] Chiru A Marincaş D Tehnologii speciale de fabricare şi reparare a autovehiculelor Universitatea ldquoTransilvaniardquo din Braşov 1991[5] Comănescu A şa Mecanica rezistenţa materialelor şi organe de maşini Editura Didactică şi Pedagogică Bucureşti 1982[6] Drăghici I şa Icircndrumar de proiectare icircn construcţia de maşini volII EdTehnică Buc 1982[7] Fuchs V Metal fatigue in Engineering John Willey 1980[8] Moraru V şa Maşini unelte speciale Editura Didactică şi Pedagogică Bucureşti 1982[9] Rădulescu R şa - Fabricarea pieselor auto şi măsurări mecanice Editura Didactică şi pedagogică Bucureşti 1983[10] Revista SAE Fatigue Design Handbook 1976[11] Sicircrbu N şi col - Analiza din punctul de vedere al fenomenului de deteriorare la oboseală la elementele portante ale autovehiculelor Conferinţa InternaţionalăCONAT 1996 Universitatea Transilvania Braşov 1996[12] Sokolovski V Teoria plasticităţii Editura tehnică Bucureşti 1963[13] Vasu O Elaborarea unor metodologii de icircncercare pe standuri hidrosimulative a componentelor de autovehicule Arhivă SC INAR SA Braşov 1993

Recent Researches in Manufacturing Engineering

978-960-474-294-3 210

312 Rolling opperation and rolling parameters

In principle there are two rolling techniques - deep rolling- combustion rolling surface

To roll the connecting radius of the spindle no 2 was chosen deep rolling technique where depth of residual tension which can reach up to 22 mmIn Fig 6 is a schematic diagram of the forces that occur in connection with rolling radius Distinguish

F - pressure on the rolls device portF1 - pressure on the rollsR -r eaction in the closed rolls chain α - angle of the roll to the spindle axisF = F1 n cos α where n = 3 (number of rolls)

Fig 6

To achieve the radius of connection they have established the following parameters- number of rolls 3- arrangement of the rollers diameter 70 mm- angle between rolls and axle spindle 300- radius of rolls 10 mm- radius of the spindle 13 mm- pressure on roll 40 kN- pressure on the device 1039 kN- number of rotations of the device 46 mm

The rolling opperation was achieved by gradually increasing force up to 13 of the maximum force of pressure while achieving a number of 6-7 turns of the roller device port Further employment growth has been achieved and performing to the maximum set of 36 rotations of the rolls device port The last step was done by descreasing rolling pressing force to 0 while making a number of 3 rotations of the device It mentions that the rotation device was carried out manuallyFig 7 presents the profile of connection radius after rolling the spindle The new radius is 10 mm footprint and depth is 08 to 09 mm Rolling surface looks like a ray connecting rectified

Fig 7

In Fig 8 is presented the spindle no 2 with rolled connection radius

Fig 8

32 Fatigue test of spindles321 Setting test systemFig 9 shows the chart corresponding to spindles materialThis material is 40Cr 10X

Fig 9

To draw this diagram are required mechanical characteristics of the material the concentration factor and Smith formula

Recent Researches in Manufacturing Engineering

978-960-474-294-3 209

2 KSSSS fama (1)

Sa - stress amplitude value in daNmm2Sm - average effort value daNmm2Sf - the material fatigue limit daNmm2K - concentration factorTo assess the fatigue behavior of spindle roolled the nonrolled spindle choose test system placed in the chart area in which to initiate and propagate cracks in the test piece The note chart test procedure A corresponding to an average of 23 daNmm2 effort So the test regime for the two spindle has the following parameters- fmin = 5 kN with σmin DaNmm2 = 149- Fmed = 80 kN with σmed DaNmm2 = 2378- Fmax = 155 kN with σmax DaNmm2 = 46- pulsating load cycles 0 - max Fatigue test was performed on a stand equipped with a cylinder servohidraulic that develops a maximum force 400kN hydraulic aggregate of 130 lmin and as command and control cabinetIn Fig 10 is presented the test stand

Fig 10

322 Fatigue tests resultsNo 1 spindle with unrolled radius has withstood a number of 950 000 cycles at which rupture occurred in radius No 2 spindle with rolled radius made a total of 198 million cycles to crack in the radius of the connection radius The literature indicated an increase of 15 to 2 rolled sustainability component Increasing spindle sustainability following attachment rolling radius was 100 (twice above unrolled spindle)

4 ConclusionsAccelerated testing regime of spindles on the stand was similar to the regime of crossing barriers in very harsh operating conditions No 1 spindle with unrolled radius has limited durability to fatigue during normal operationFor any component required in a bench trial basis the maximum stress is close to the fatigue stress () and must

withstand a number of approximately 2 x 106 cycles applicationNo 2 spindle with rolled radius withstood the fatigue 198 x 106 cycles to failureIn this case we conclude that the spindle rolled radius has unlimited durability in normal operating conditionsBased on the results of comparative tests on the stand designs for simple rolling equipment can be made to provide a range of components manufactured in small series

ACKNOWLEDGEMENT1 This paper is supported by the Sectoral Operational Programme Human Resources Development (SOP HRD) financed from the European Social Fund and by the Romanian Government under the contract number POSDRU8915S59323 ACKNOWLEDGEMENT2 This paper is supported by the Sectoral Operational Programme Human Resources Development (SOPHRD) financed from the European Social Fund and by the Romanian Government under the contract number POSDRU8815S5932 amp POSDRU615S6

References[1] Bobancu Ş Creativitate şi inventică suport curs PDF Universitatea ldquoTransilvaniardquo din Braşov[2] Boleanţu L Rezistenţa materialelor volI Institutul Politehnic Timişoara 1973[3] Buzdugan Gh Rezistenţa materialelor Editura Academiei Bucureşti 1986[4] Chiru A Marincaş D Tehnologii speciale de fabricare şi reparare a autovehiculelor Universitatea ldquoTransilvaniardquo din Braşov 1991[5] Comănescu A şa Mecanica rezistenţa materialelor şi organe de maşini Editura Didactică şi Pedagogică Bucureşti 1982[6] Drăghici I şa Icircndrumar de proiectare icircn construcţia de maşini volII EdTehnică Buc 1982[7] Fuchs V Metal fatigue in Engineering John Willey 1980[8] Moraru V şa Maşini unelte speciale Editura Didactică şi Pedagogică Bucureşti 1982[9] Rădulescu R şa - Fabricarea pieselor auto şi măsurări mecanice Editura Didactică şi pedagogică Bucureşti 1983[10] Revista SAE Fatigue Design Handbook 1976[11] Sicircrbu N şi col - Analiza din punctul de vedere al fenomenului de deteriorare la oboseală la elementele portante ale autovehiculelor Conferinţa InternaţionalăCONAT 1996 Universitatea Transilvania Braşov 1996[12] Sokolovski V Teoria plasticităţii Editura tehnică Bucureşti 1963[13] Vasu O Elaborarea unor metodologii de icircncercare pe standuri hidrosimulative a componentelor de autovehicule Arhivă SC INAR SA Braşov 1993

Recent Researches in Manufacturing Engineering

978-960-474-294-3 210

2 KSSSS fama (1)

Sa - stress amplitude value in daNmm2Sm - average effort value daNmm2Sf - the material fatigue limit daNmm2K - concentration factorTo assess the fatigue behavior of spindle roolled the nonrolled spindle choose test system placed in the chart area in which to initiate and propagate cracks in the test piece The note chart test procedure A corresponding to an average of 23 daNmm2 effort So the test regime for the two spindle has the following parameters- fmin = 5 kN with σmin DaNmm2 = 149- Fmed = 80 kN with σmed DaNmm2 = 2378- Fmax = 155 kN with σmax DaNmm2 = 46- pulsating load cycles 0 - max Fatigue test was performed on a stand equipped with a cylinder servohidraulic that develops a maximum force 400kN hydraulic aggregate of 130 lmin and as command and control cabinetIn Fig 10 is presented the test stand

Fig 10

322 Fatigue tests resultsNo 1 spindle with unrolled radius has withstood a number of 950 000 cycles at which rupture occurred in radius No 2 spindle with rolled radius made a total of 198 million cycles to crack in the radius of the connection radius The literature indicated an increase of 15 to 2 rolled sustainability component Increasing spindle sustainability following attachment rolling radius was 100 (twice above unrolled spindle)

4 ConclusionsAccelerated testing regime of spindles on the stand was similar to the regime of crossing barriers in very harsh operating conditions No 1 spindle with unrolled radius has limited durability to fatigue during normal operationFor any component required in a bench trial basis the maximum stress is close to the fatigue stress () and must

withstand a number of approximately 2 x 106 cycles applicationNo 2 spindle with rolled radius withstood the fatigue 198 x 106 cycles to failureIn this case we conclude that the spindle rolled radius has unlimited durability in normal operating conditionsBased on the results of comparative tests on the stand designs for simple rolling equipment can be made to provide a range of components manufactured in small series

ACKNOWLEDGEMENT1 This paper is supported by the Sectoral Operational Programme Human Resources Development (SOP HRD) financed from the European Social Fund and by the Romanian Government under the contract number POSDRU8915S59323 ACKNOWLEDGEMENT2 This paper is supported by the Sectoral Operational Programme Human Resources Development (SOPHRD) financed from the European Social Fund and by the Romanian Government under the contract number POSDRU8815S5932 amp POSDRU615S6

References[1] Bobancu Ş Creativitate şi inventică suport curs PDF Universitatea ldquoTransilvaniardquo din Braşov[2] Boleanţu L Rezistenţa materialelor volI Institutul Politehnic Timişoara 1973[3] Buzdugan Gh Rezistenţa materialelor Editura Academiei Bucureşti 1986[4] Chiru A Marincaş D Tehnologii speciale de fabricare şi reparare a autovehiculelor Universitatea ldquoTransilvaniardquo din Braşov 1991[5] Comănescu A şa Mecanica rezistenţa materialelor şi organe de maşini Editura Didactică şi Pedagogică Bucureşti 1982[6] Drăghici I şa Icircndrumar de proiectare icircn construcţia de maşini volII EdTehnică Buc 1982[7] Fuchs V Metal fatigue in Engineering John Willey 1980[8] Moraru V şa Maşini unelte speciale Editura Didactică şi Pedagogică Bucureşti 1982[9] Rădulescu R şa - Fabricarea pieselor auto şi măsurări mecanice Editura Didactică şi pedagogică Bucureşti 1983[10] Revista SAE Fatigue Design Handbook 1976[11] Sicircrbu N şi col - Analiza din punctul de vedere al fenomenului de deteriorare la oboseală la elementele portante ale autovehiculelor Conferinţa InternaţionalăCONAT 1996 Universitatea Transilvania Braşov 1996[12] Sokolovski V Teoria plasticităţii Editura tehnică Bucureşti 1963[13] Vasu O Elaborarea unor metodologii de icircncercare pe standuri hidrosimulative a componentelor de autovehicule Arhivă SC INAR SA Braşov 1993

Recent Researches in Manufacturing Engineering

978-960-474-294-3 210