UDC620.1/669.1/72 ISBN974-8118-21-5 THAI INDUSTRIAL STANDARD. 244 4 72525 4 () 5 6 7STANDARDTESTMETHODSOFIRONANDSTEEL 6 10400 0 2202 3300 99 107 4 2525. 244 4 72525(2)156 . . . . - () (3) 4 4 () 5 6 7 4 () () 4 3 BS 18 : Part 2 : 1971 Method for tensile testing of metals Part 2 steel (general)BS 4759 :1971 Method for determination of Kvalues of a tensile testing system 5 3 0.5 BS 18 : Part 3 : 1971 Method for tensile testing of metals Part 3 steel sheet and strip (less than3 mm and not less than 0.5 mm thick)BS 4759 :1971 Method for determination of Kvalues of a tensile testing system 6 BS 18 : Part 4 : 1971 Method for tensile testing of metals Part 4 steel tubesBS 4759 :1971 Method for determination of Kvalues of a tensile testing system 7 BS 4545 :1970 Method for mechanical testing of steel wire 15 .. 2511(5) 598 ( .. 2525 ) .. 2511 4 () 15 .. 2511 4 () . 244 42525 12 .. 2525 -1-. 244 4-2525 4 ()1. 1.1 4 3 (1) 5 . 244 5(2) 6 . 244 6(3) 7 . 244 72. 2.1 (gauge length) 2 2.1.1 (Lo) 2.1.2 (Lu) 2.2 (extensometer gauge length, Le) 2(Lo)(d) (b) (Lc)2.3 (permanent elongation) ( ) -2-. 244 4-25252.4 (elongation, A) 5.65\So A10 10\4 So/t2.5 (reduction of area, Z) 2.6 (maximum load, Fm) 2.7 (stress) (nominalstress)2.8 (tensile strength or maximum tensile stress, Rm) (Fm) 2.9 (yield stress) (plastic deformation) 2.9.1 (upper yield stress, ReH) ( 3) (yield) 2.9.2 (lower yield stress, ReL) (initial transient effect) ( 3 4) (coldworking) (heattreatment) ( 2.10 2.11)2.10 (proof stress for momproportional elongation, RP) (7) 0.2 RP 0.22.11 (proof stress for total elongation or proof steess under load, Rt) (total elongation) (elastic elongation) ( 8) 0.5 Rt 0.52.12 (permanent set stress, Rr) ( 9) Rr 0.2-3-. 244 4-25253. 3.1 1 1 101 ( 3.1) * L R Lo RmLuLoLo= 100||.|

\SoSuSo= 100||.|

\FmSo\ d ( 1)a ( 1)b ( 1)Lo* ( 1)Lc ( 1)LeLt ( 1)Lu ( 2)A ( A10) ( 10 4 So/t )So (1)Su ( 2)SeH ( 3, 4 5)ReL ( 3, 4 5)RP ( 7)( Rp 0.2) ( 0.2)Rt ( 8)( Rt 0.5) ( 0.5)Rr ( 9)( Rr 0.2) 0.2)Fm Z Rm* =( 10)r (1)-4-. 244 4-2525 1 ( 3.1 4.1) 2 ( 3.1 4.1) 1 2 -5-. 244 4-2525 3 4 3 4 ( 2.9.1 2.9.2 3.1) 5 6 A (elastic limit)B CD (yield stress elongation) 5 6 ( 3.1) RoHRoL ORoHRoLRoHRoLOBDC AOBDA CV 0.5%XO-6-. 244 4-2525 7 8 9 10 A 7 10 ( 2.10 2.11 2.12 3.1) 4. 4.1 4.1.1 8 : 1 2 3 4.1.2 2 3 Rp AAO ORtRrFmAO O -7-. 244 4-25254.1.3 Lo = 5.65\So Lo 5d4.1.4 4.1.3 4.1.5 (Lc) Lo + Lo + 2d ( ) Lo + 1.5 \So Lo + 2.5 \So Lc = Lo + 2d Lc = Lo + 2 \So4.1.6 Lo + 1.5 \So Lo + 1.5\So So 2 Lo = 5.6 \So( 4.1) 1. 0.032. 0.033. 4.2.5.14. ( 4.3.1)5. 25.65\ So 5 d2( 3.) mm3.99 20 22 4 0.0225 5.64 28 31 5 0.0350 7.98 40 44 8 0.04100 11.28 56 62 10 0.06150 13.82 69 76 13 0.07200 15.96 80 88 15 0.08400 22.56 113 124 0.13dmm mm2So Lo( 4.)mm12.523.5rmmLc 5.5dmm-8-. 244 4-2525 3 ( )( 4.1) 1. 35.6\So2. 325502003. 12.50.0312.50.14. 4.2 4.2.1 4.2.1.1 30 4.2.1.2 30 75 15 4.2.1.3 75 4.2.2 (flat products) 3 12 6 506 24 12 10050 25 20025 100 25 30012.5Lt r Lob-9-. 244 4-25254.2.3 4.2.4 4.2.5 4.2.5.1 2 0.5 4.2.5.2 14.3 4.3.1 4.1 5 10 4.3.2 4.3.3 4.3.4 -10-. 244 4-25255. 5.1 5.2 5.3 5.3.1 5.3.2 5.3.3 5.3.4 5.3.11 2.9 2.10 2.11 ( . )5.3.4 5.3.4.1 (1) (apparent elastic compliance, K) ( 5.3.4.3) (2) (3) -11-. 244 4-25255.3.4.2 (K) Lc 1K = K Lc Vp Ve E So ( BS 4759) 5.3.4.3 (K)(1) 0.0025 30 (3 ) 30 4 K 0.002 5 1 10 4 KK0.000 3 K(30)0.0025 VpVeESo||.|

\-12-. 244 4-2525(2) K 30 5.3.5 5.3.5.1 ( 5 9) 0A 5 9 ( )5.3.5.2 5 A (BCD 5) (CD 6 X)5.3.5.3 5.3.5.4 A ( 7, 8 9) 5.3.7 5.3.85.3.6 5.3.6.1 (ReH) / (ReL) 5.3.6.2 (1) 0.0025 90 (2) 4 ( 4. 4)(3) 30 -13-. 244 4-25255.3.6.3 2.9 ( Y 6) 0.5 5.3.7 5.3.7.1 (Rp) (Rt) 30 5.3.4.3(2) 3 30 5.3.7.2 (Rp) 0.2 ( 7)(1) (2) 5.3.7.3 (Rt) 8 (1) 65011005.3.8 5.3.8.1 10 15 5.3.8.2 -14-. 244 4-25255.3.9 5.3.9.1 (10) (1) (2) (3) 5.3.9.2 2.85.3.10 5.3.10.1 2.45.3.10.2 5.65\So 5.65\So5.3.10.3 ( 5.3.10.5) 5.3.10.4 5 -15-. 244 4-25255.3.10.5 (1) (2) (3) 5.3.11 2.5-16-. 244 4-25254 ( 5.3.4.3 5.3.6.2) ( 0.002 5 ) -17-. 244 4-2525 1. 0.0025 2. 3030 0.0025 8 3. 30 (0.002 5 ) 8 16 4. 1105. = 0.0025 E(1 + K. E. So/Lc)-18-. 244 4-2525 . .1 .1.1 .1.2 .1.3 .2 .3 599 ( .. 2525 ) .. 2511 5 15 .. 2511 5 . 244 52525 12 .. 2525 (5)-1-. 244 5-2525 5 1. 1.1 3 0.5 (1) 4 () . 244 4(2) 6 . 244 6(3) 7 . 244 72. 2.1 . 244 43. 3.1 3..244 4 1 2 1 ( 3.1 4.1.1)-2-. 244 5-2525 2 ( 3.1 4.1.1) 1 2 4. 4.1 4.1.1 1 2 20 4.1.1.1 Lo 3b4.1.2 1 1 ( 4.1.2) 0.212.5 1 50 0.5 75 520 1 80 0.8 120 10 140 1020 1 200 2 225 10 260 10b87.5 5Lo Lc-3-. 244 5-25254.2 4.2.1 4.2.2 4.2.3 4.2.4 2 0.24.3 4.3.1 14.3.2 5. 5.1 5.2 5.3 5.3.1 5.3.2 3 -4-. 244 5-2525 3 ( 5.3.2)5.3.3 5.3.4 5.3.5 .244 4 2.9 2.10 2.11 ( 5.3.6 )5.3.4 5.3.4.1 (1) (apparent elastic compliance, K) ( 5.3.4.3) (2) (3) -5-. 244 5-25255.3.4.2 (K) K = K Lc vp ve E So ( BS 4759) 5.3.4.3 (K)(1) 0.0025 30 (3 ) 30 2 K 0.002 5 1 10 2 K K 0.000 3 K(30 ) 0.002 5 vpveE SoLc1-6-. 244 5-2525(2) K 30 5.3.5 .244 4 5.3.5 5.3.6 5.3.7 5.3.8 5.3.9 5.3.10 2 4 .244 45.3.6 .244 4 .-7-. 244 5-25252 ( 5.3.4.3 5.3.5) ( 0.002 5 ) -8-. 244 5-2525 2 ( )-9-. 244 5-2525 1. 0.0025 2. 30 30 0.0025 8 3. 30 (0.002 5 ) 8 16 4. 110 5. = 0.0025 E(1 + K.E.So/Lc) 600 ( .. 2525 ) .. 2511 6 15 .. 2511 6.24462525 12 .. 2525 (5)-1-. 244 6-2525 6 1. 1.1 40 0.5 (1) 4 () .244 4(2) 5 .244 5(3) 7 .244 72. 2.1 .244 43. 3.1 3..244 4 a b d D -2-. 244 6-2525 1 ( 3.1 4.1) 2 ( 3.1 4.1)4. 4.1 4.1.1 1 2 4.1.1.1 0.33 4.1.1.2 -3-. 244 6-25254.1.2 D D4.1.3 ( 2) Lo + Lo + 2b Lc = Lo 2b4.1.4 Lo = 5.65\So ( .244 4 5.3.10.2 )4.1.5 4.1.5.1 1 4.1.5.2 ( 7.85 1.015 0.985 )4.1.5.3 4.1.5.4 So=ab So=ab (1 + )( 2 )4.2 4.2.1 4.1 5 10 4.2.2 D4b21 b26 Dd--4-. 244 6-25254.2.3 4.2.4 5. 5.1 5.2 5.3 5.3.1 5.3.2 5.3.2.1 5.3.3 5.3.4 5.3.6 .244 4 2.9 2.10 2.11 . 5.3.4 5.3.4.1 (1) (apparent elastic compliance, K) ( 5.3.4.3) (2) (3) -5-. 244 6-25255.3.4.2 (K) Lc1K = K Lc vp ve E So ( BS 4759) 5.3.4.3 (K)(1) 0.0025 30 ( 3 ) 30 1 K 0.002 5 1 10 1 K K 0.00 3 K(30 ) 0.002 5 vpveESo||.|

\-6-. 244 6-2525(2) K 30 5.3.5 .244 4 5.3.5 5.3.6 5.3.7 5.3.8 5.3.9 5.3.10 1 4 .244 45.3.6 5.3.6.1 5.3.6.2 .244 4 2.5-7-. 244 6-25251 ( 5.3.4.3 5.3.5) ( 0.002 5 ) -8-. 244 6-2525 1 ( )-9-. 244 6-2525 1. 0.00252. 30 30 0.0025 8 3. 30 (0.002 5 ) 8 16 4. 110 5. = 0.0025 E(1 + K.E.So/Lc) 601 ( .. 2525 ) .. 2511 7 15 .. 2511 7 .244 72525 12 .. 2525 (5)-1-. 244 7-2525 7 1. 1.1 (cold working) 4 (characteristic dimension) 10 (1) 4 () .244 4(2) 5 .244 5(3) 6 .244 62. .244 4 2.9 2.1 () (Re) (slavepointer) -2-. 244 7-25253. 3.1 .244 4 3. a b d 1 ( 3.1 4.1)4. 4.1 4.1.1 4.1.2 100 200 3 10d 50 250 4.1.3 50 -3-. 244 7-25254.2 4.2.1 4.2.2 4.2.2.1 0.5 3 1.0 3 4.2.2.2 4.2.2.3 4.3 4.3.1 2d 0.5 4.3.2 5. 5.1 5.2 5.3 5.3.1 5.3.2 (carborundum) (capstans) -4-. 244 7-25255.3.3 5.3.4 5.3.9 .244 4 2.10 2.115.3.4 (Re) 2.1 30 5.3.5 (Rp) (Rt) 30 0.01 5.3.5.1 (Rp) 0.2 (1) (2) 5.3.5.2 (Rt) (initial load) -5-. 244 7-25255.3.6 5.3.6.1 10 15 5.3.6.2 5.3.7 5.3.7.1 5.3.5 100 5.3.7.2 100 5.3.7.3 5.3.8 5.3.8.1 .244 4 2.4 0.5 5.3.8.2 5.3.8.3 (straightedge) 5.3.8.4 (1) (2) 2d (3) 2d 5.3.9 5.3.9.1 3 5.3.9.2 .244 4 2.5