SMALL PUNCH CREEP TESTING FOR MATERIAL CHARACTERIZATION AND LIFE TIME PREDICTION

The Small Punch (SP) test is a miniature technique that can provide information on materials performance for a range of situations where standard testing is not applicable or considered too material consuming. The SP is especially suited for determining material properties for heat affected zones in welds (local) and for nearly non-destructive testing of service exposed materials. Also, the SP is a powerful tool for ranking of novel materials produced in small quantities and for testing irradiated materials. The SP test is multi-axial in nature and the deformation and stress response is complex. The interpretation of SP test results is challenging and the validity of simplified transformation assumptions can be argued. In this paper SP test data generated following the SP testing Code of Practice are analysed for the determination of creep properties of P91 steel. The results are assessed and compared to corresponding uniaxial data and public domain results. Special attention is given to test set-up details, initial specimen deformation (creep), test repeatability and post-test examination procedures. The measured data scatter is used for determining expected life time prediction accuracy in creep.

HOLMSTROM Bjorn;  HAEHNER Peter;  HURST Roger Christopher;  BRUCHHAUSEN Matthias;  FISCHER Burkhard;  LAPETITE Jean-Marc;  GUPTA Mohita; 

2015-01-19

Forschungszentrum Juelich

JRC89970

978-3-95806-000-5,   

1866-1793,   

https://publications.jrc.ec.europa.eu/repository/handle/JRC89970,