基于双参数屈服准则的细观损伤模型

doi:10.11896/cldb.24120180

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Abstract The ductile fracture of plastic metal originates from the development of pores. Analyzing the evolution process of pores and establishing a reasonable damage model facilitates the study of deformation and fracture mechanisms of plastic metal. Two kinds of high-quality carbon structural steels were subjected to uniaxial tensile test. The micro fracture morphology of tensile fracture specimens of the two materials was observed by scanning electron microscope (SEM). From the perspective of vacancy condensation, the nucleation mechanism of voids in the absence of inclusions or second phase particles was analyzed. Considering the influence of hydrostatic pressure on the evolution of pores, based on a two-parameter yield criterion that includes the first invariant of the stress tensor and the second invariant of the deviatoric stress tensor, expressions for plastic dissipation power, microscopic strain rate, and macroscopic stress were derived. On this basis, a macroscopic yield function containing microscopic damage parameters (void volume fraction) was established. When using tensile and compressive yield stresses to define material parameters α and K, the model can be transformed into the Lee model and Gurson model. In addition, this model can also describe the essence of the deterioration of plastic metal mechanical properties caused by void evolution, and has universality in studying the mechanical mechanism of ductile fracture caused by void evolution.

Key words： plastic metal ductile fracture void nucleation two-parameter yield criterion fracture mechanism

Published: 10 January 2026 Online: 2026-01-09

CLC number:

O346

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	ZENG Jiaxing

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ZENG Jiaxing. Microscopic Damage Model Based on Two-parameter Yield Criterion[J]. Materials Reports, 2026, 40(1): 24120180-6.

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https://www.mater-rep.com/EN/10.11896/cldb.24120180 OR https://www.mater-rep.com/EN/Y2026/V40/I1/24120180

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