ÚJV Řež, a. s.

Current status of the small punch test standardization within the

ASTM

Radim KOPŘIVA, Milan BRUMOVSKÝ, Petra PETELOVÁ

5th International Small Sample Test Techniques Conference – SSTT2018

10-12 July 2018 Swansea University Bay Campus, Wales

Outline

Current status of normative documents for SPT

Standardization in ASTMInterlaboratory testing ILS1408

Selected materials, testing requirements

Data evaluation

Open questions

Current plan of ASTM standardization

1

Current state of SP standardization (1/2)

Existing standardThe Society of Materials Science, Japan (Ed.), Standard for Small Punch Creep Test –Estimation of Residual Life for High Temperature Component, vol. ISBN 978-4-901381-38-3, 2012.

Focused on the SP creep tests, only partly translated

Other „standards“ASTM F2183-02(2008) - Standard Test Method for Small Punch Testing of Ultra-High Molecular Weight Polyethylene Used in Surgical Implants

ASTM F2977-13 - Standard Test Method for Small Punch Testing of Polymeric Biomaterials Used in Surgical Implants

Characterization of surgical implants material at RTMainly for the reproducibility of results and not for the determination of mechanical properties

2

Current state of SP standardization (2/2)

Other „standards“ – contd.ASTM E 643-15 - Standard Test Method for Ball Punch Deformation of Metallic Sheet Material

Specimen thickness 0,2 – 2 mmDiameter – min. 89 mm, punch diameter – 22,2 mmFocused on the deformation behaviour of materials

Pre-normative document for SPTCEN Workshop Agreement (CWA 15627:2007)

Ongoing standardization activitiesCEN/CENELEC - ECISS TC101 / WG1 (European Committee for Iron and Steel Standardization)American Society for Testing and Materials (ASTM)

3

ASTM Standardization (1/8)

American Society for Testing and Materials Committee E10 – Nuclear Applications Sub-committee E10.02 – Behavior and Use of Nuclear Structural MaterialsASTM WK47431 (changed to WK61832) – New practice for Small Punch test method for metallic materials. 6th International Symposium Small Specimen Test Techniques (ASTM) - 2014

Interlaboratory Study – ILS1408 – 2017 Extensive program of round robin testing – 14 laboratories

Czech Republic – ÚJV Řež, Comtes FHT,Europe – VÚJE (Slovakia), HZDR (Germany), CIEMAT (Spain), JRC Petten(Netherlands), Swansea University, NNL (GB), Asia – CRIEPI (Japan), KAERI (Korea), IGCAR (India), ECUST (China),USA – EPRI, Oak Ridge

6 selected materials – 7 states8 measured parameters to be recorded

4

ASTM Standardization (2/8)

Tested materials – ILS14086 selected materials – 7 states

5

Material Dimensions Pcs

A533B (JRQ) 8 mm x 0.5 mm 8 pcs 8 mm x 58 mm 1 pc

15Kh2MFA (15Ch2MFA) 8 mm x 63 mm 1 pc08Kh18N10T (08Ch18N10T) 8 mm x 63 mm 1 pc22K 8 mm x 54 mm 1 pc10Kh11N20T3R (10Ch11N20T3R) 8 mm x 54 mm 1 pcCOST F 8 mm x 63 mm 1 pc

ASTM Standardization (3/8)

Requested testing parameters 8 x 0.5 mm – thickness h0 = 0.5 mm ± 0.005 mmSpecimens tightened 10 N.mTesting temperature - 23 ± 2 °CCrosshead 0.5 mm/minDeflection / displacement record Min. 5 tests per material

Recorded dataFe, Fm [N]um, uf [mm]εf [-]ESP (ETO, EPL) [J]

6

Fe

ASTM Standardization (4/8)

Statistical evaluation of results ASTM E691-15 – Standard Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method

Total evaluation - 56 excel files and 112 separate charts

Repeatability and reproducibility – one technician, same tests in three consecutive days

Additional information from participants (questionnaire)

Type of testing machine (servohydraulic / electromech.)

Radius / Chamfer (real dimensions)

Type of indenter

Deflection/displacement measurements

Sample preparation method

Initial thickness of the specimen before finishing7

ASTM Standardization (5/8)

8

ILS Data Evaluation – Example (A533B – JRQ – Fm)

ASTM Standardization (6/8)

9

ILS Data Evaluation – Example (A533B – JRQ – Fm)Inter-laboratory consistence - h

ASTM Standardization (7/8)

10

ILS Data Evaluation – Example (A533B – JRQ – Fm)Intra-laboratory consistence - k

ASTM Standardization (8/8)

Expected schedule (after E10 committee meeting in June 2018)

11

2014 2016 2017 2018 2019 2020

6th International Symposium

Small Specimen Test Techniques

(ASTM)

Decision on the start of R-R as a

basis for the standard

preparation

Start of ILS1408Data collection and

evaluation

ILS1408 results submitted to the

ASTM ILS section for approval

Balloting of the draft standard

Standard in the ASTM Book of

Standards

Standardization – open questions (1/2)

Issues to be addressed during the standardization (EN, ASTM)Apparatus geometry (radius / chamfer), nominal / real dimension

12

Standardization – open questions (2/2)

Issues to be addressed during the standardization (EN, ASTM)Indenter type (punch / ball)

Deflection / displacement measurementsStiffness correction of the testing equipment

Specimen final thickness measurements

13

Thank you very much for the attention!

14