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Global nonequilibrium energy criterion for predicting strength of 316L stainless steel under complex loadings:Theoretical modeling and experimental validation

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Science China(Physics,Mechanics & Astronomy) 2022年第4期65卷 62-71页

作者： Yanying Hu Jiapeng Chen Biao Wang Sino-French Institute of Nuclear Engineering and Technology Sun Yat-Sen UniversityZhuhai 519082China School of Physics Sun Yat-Sen UniversityGuangzhou 510275China

Classical strength criteria are developed based on some empirical assumptions and have been widely used in engineering to predict material strength owing to their simplicity. In some cases, however, considerable discrepancies arise between classicalstrength-criteria-based theoretical predictions and experimental results. Recently, a global nonequilibrium thermodynamics model has made important progress over classical models without resorting to any empirical assumptions. A prominent advance of this rational energy model is that it straightforwardly determines the dissipation energy density function, which is pertinent to inherent material ductility, through simple uniaxial and equi-biaxial tensions. In this study, a brief introduction of the nonequilibrium energy model was followed by systematic experimental investigation to determine the dissipation energy function and predict the material strength of pristine 316 L stainless steel-commonly used in engineering-under complex loadings. The results indicated that the strength contours predicted by the nonequilibrium energy criterion for complex loadings are consistent with the experimental results obtained for biaxial tension, implying that the nonequilibrium thermodynamics model is both reasonable and reliable. The prediction error was presumed to be induced by the anisotropy of the 316 L stainless steel sheets.

关键词： failure criterion nonequilibrium process 316L stainless steel strength prediction complex loading

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EXPERIMENTAL INVESTIGATION ON HISTORY-DEPENDENCEOF PLASTIC BEHAVIOR OF TYPE 302 STAINLESS STEELUNDER COMBINED AXIAL-TORSIONAL LOADS

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Acta Metallurgica Sinica(English Letters) 1997年第1期10卷 65-70页

作者： S.X. Zhao X.F. Sun and Z.B. Kuang (Institute of Applied Mechanics, Southwestern Jiaotong University, Chengdu 610031, China)(Institute of Engineering Mechanics, Xi’an Jiaotong University, Xi’an 710049, China) Southwestern Jiaotong Univ Chengdu China

Experimental investigations were pedermed on the plastic deformation along bilinear strain paths with various values of corner-angle by subjecting thin-walled tubular specimens of type 302 stainless steel to combined axial and torsional loads. Variations of scalar and vectorial behavior of the stress response are discnssed in the vector space of plastic strain. It is found that the intrinsic geometry of loading path, the plastic strain history and the coapled effect among strain components effect effectively the stress response of the material. The experimental results also show that these effects will disappear gradually with increasing strain.

关键词： complex loading plastic delay angle history-dependence of plastic deformation

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