Current status of the small punch test standardization within the ASTM

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Magdalen Logan
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1 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 SSTT July 2018 Swansea University Bay Campus, Wales

2 Outline Current status of normative documents for SPT Standardization in ASTM Interlaboratory testing ILS1408 Selected materials, testing requirements Data evaluation Open questions Current plan of ASTM standardization 1

3 Current state of SP standardization (1/2) Existing standard The Society of Materials Science, Japan (Ed.), Standard for Small Punch Creep Test Estimation of Residual Life for High Temperature Component, vol. ISBN , Focused on the SP creep tests, only partly translated Other standards ASTM F (2008) - Standard Test Method for Small Punch Testing of Ultra-High Molecular Weight Polyethylene Used in Surgical Implants ASTM F Standard Test Method for Small Punch Testing of Polymeric Biomaterials Used in Surgical Implants Characterization of surgical implants material at RT Mainly for the reproducibility of results and not for the determination of mechanical properties 2

4 Current state of SP standardization (2/2) Other standards contd. ASTM E Standard Test Method for Ball Punch Deformation of Metallic Sheet Material Specimen thickness 0,2 2 mm Diameter min. 89 mm, punch diameter 22,2 mm Focused on the deformation behaviour of materials Pre-normative document for SPT CEN Workshop Agreement (CWA 15627:2007) Ongoing standardization activities CEN/CENELEC - ECISS TC101 / WG1 (European Committee for Iron and Steel Standardization) American Society for Testing and Materials (ASTM) 3

5 ASTM Standardization (1/8) American Society for Testing and Materials Committee E10 Nuclear Applications Sub-committee E10.02 Behavior and Use of Nuclear Structural Materials ASTM WK47431 (changed to WK61832) New practice for Small Punch test method for metallic materials. 6th International Symposium Small Specimen Test Techniques (ASTM) Interlaboratory Study ILS 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 states 8 measured parameters to be recorded 4

6 ASTM Standardization (2/8) Tested materials ILS selected materials 7 states 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 pc 08Kh18N10T (08Ch18N10T) 8 mm x 63 mm 1 pc 22K 8 mm x 54 mm 1 pc 10Kh11N20T3R (10Ch11N20T3R) 8 mm x 54 mm 1 pc COST F 8 mm x 63 mm 1 pc 5

7 ASTM Standardization (3/8) Requested testing parameters 8 x 0.5 mm thickness h 0 = 0.5 mm ± mm Specimens tightened 10 N.m Testing temperature - 23 ± 2 C Crosshead 0.5 mm/min Deflection / displacement record Min. 5 tests per material Recorded data F e, F m [N] u m, u f [mm] ε f [-] E SP (E TO, E PL ) [J] Fe 6

ASTM Standardization (4/8) 7 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

8 ASTM Standardization (4/8) 7 Statistical evaluation of results ASTM E 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 finishing

9 ASTM Standardization (5/8) ILS Data Evaluation Example (A533B JRQ F m ) 8

10 ASTM Standardization (6/8) ILS Data Evaluation Example (A533B JRQ F m ) Inter-laboratory consistence - h 9

11 ASTM Standardization (7/8) ILS Data Evaluation Example (A533B JRQ F m ) Intra-laboratory consistence - k 10

ASTM Standardization (8/8) Expected schedule (after E10 committee meeting in June 2018) 6 th International Symposium Small Specimen Test Techniques (ASTM) Decision on the start of R-R as a basis for

12 ASTM Standardization (8/8) Expected schedule (after E10 committee meeting in June 2018) 6 th International Symposium Small Specimen Test Techniques (ASTM) Decision on the start of R-R as a basis for the standard preparation Start of ILS1408 Data 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

13 Standardization open questions (1/2) Issues to be addressed during the standardization (EN, ASTM) Apparatus geometry (radius / chamfer), nominal / real dimension 12

measurements Stiffness correction of the

14 Standardization open questions (2/2) Issues to be addressed during the standardization (EN, ASTM) Indenter type (punch / ball) Deflection / displacement measurements Stiffness correction of the testing equipment Specimen final thickness measurements 13

15 14 Thank you very much for the attention!

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