Accurate Estimating of Mechanical Properties of Austenitic Stainless Steels with Residual Stresses Using Indentation Technique

Document Type : Research Article

Authors

Department of Mechanical Engineering, University of Zanjan, Zanjan, Iran

Abstract

This study considers the accurate determination of the mechanical properties of austenitic steels containing equibiaxial residual stress by the spherical indentation technique. Many numerical simulations have been developed to evaluate the accuracy of the Kim and Lee methods. The results revealed that the Kim method evaluates a specimen's mechanical properties with higher accuracy than the Lee method. The Kim method was utilized in this paper to investigate the effect of residual stress on the accuracy of the indentation technique. The results of the study showed that residual stresses could lead to significant errors in the results of estimating the properties of materials like elasticity module, yield strength, and work hardening. By formulating the error changes as a function of work hardening and normalized residual stress, a method has been proposed to reduce the error. The proposed method has significantly mitigated the error in estimating the properties of materials with residual stress through the Kim method. Based on the results, the absolute value of errors has decreased from a maximum of 48% for , 33% for , and 39% for to 12%, 1%, and 3% respectively. Experimental tests on the stainless steel 321 sample were used to validate the results, and by comparing the numerical results, it was shown that a more accurate value for the properties of materials could be obtained using the proposed method.

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References

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AUT Journal of Mechanical Engineering
Volume 6, Issue 4
December 2022
Pages 511-524

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