PSI - Issue 60

Ganesh Nigudage et al. / Procedia Structural Integrity 60 (2024) 678–689 Ganesh Nigudage / Structural Integrity Procedia 00 (2023) 000 – 000

689

correlations were established using SP characteristic parameters (forces and punch displacement) and tensile properties from standard tension test. Base on correlation coefficient, for estimating yield strength and tensile strength both Way 1 (i.e correlation with non-zero intercept) and way 2 (i.e correlation with zero intercept) were suitable as correlation coefficient(r) value were >0.92 but for elongation Way 2 was more suitable. The validated correlations were derived which had optimum value of correlation coefficient(r) and minimum error in estimating properties of thermal base and weld at room temperature and -60 o C . Unity plots displaying relationship between uniaxial tensile results and predicted properties from validated correlations indicated good agreement.. Out of the various approaches, the best suitable approach was F (0.1mm,offset) normalized by h o 2 and correlated using non-zero intercept for yield strength ( σ Y = 0.17x(F _(0.1mm,offset) /ho 2 ) +172.35), F m normalized by h o 2 and correlated using non-zero intercept for tensile strength (σ UTS = 0.088× (F m /h o 2 ) +32.81) and v m correlated using zero intercept for elongation ( = 9.98 × ) because the percentage error in estimation of tensile properties from these correlations is least. Acknowledgements The authors would like to thank Shri K.B. Gaonkar, Nirav Kumar for their help in carrying out the experiments References [1] Jonathan Torres, Ali P. Gordon, (2021). Mechanics of the small punch test: a review and qualification of additive manufacturing materials. Journal of Materials Science volume 56, pages 10707 – 10744. [2] Jana Vaclavkova, Ludovit Kupca. (2001). A Small Punch Test Method Application for the Evaluation of Reactor Pressure Vessel Material Properties Degradation. Communications - Scientific Letters of the University of Zilina, 3(4):26-30. [3] Enrico Lucon, Jake Benzing, Nik Hrabe, (April 2020). Development and Validation of Small Punch Testing at NIST, National Institute of Standards and Technology Interagency or Internal Report 8303, Natl. Inst. Stand. Technol. Interag. Intern. Rep. 8303, 55 pages. [4] T. Garcia, C. Rodriguez, F. Belzunce, C. Suarez, (2014). Estimation of the mechanical properties of metallic materials by means of the small punch test, Journal of Alloys and Compounds 582 ,708 – 717. [5] K. Matocha, (2015). Small-punch testing for tensile and fracture behavior: Experiences and way forward, ASTM Special Technical Publication STP 1576 ,145 – 159. [6] X. Mao, H. Takahashi, (1987). Development of a further-miniaturized specimen of 3 mm diameter for TEM disk (diameter 3 mm) small punch tests, J. Nucl. Mater. 150 (1) 42 – 52. [7] E. Altstadt, H. Ge, V. Kuksenko, M. Serrano, M. Houska, M. Lasan, M. Bruchhausen, J.-M. Lapetite, Y. Dai, (2016). Critical evaluation of the small punch test as a screening procedure for mechanical properties, J. Nucl. Mater. 472, 186 – 195. [8] M. Moreno, G. Bertolino, A. Yawny, (2016). The significance of specimen displacement definition on the mechanical properties derived from Small Punch Test, Materials and Design 95, 623 – 631.