Constitutive Model and Failure Criterion Parameters of 1Cr21Ni5Ti Duplex Steel

LIU Yunshao; ZENG Shenghui; CHEN Junhong; YIN Biao; ZHANG Shengde; HUANG Xicheng

doi:10.7643/issn.1672-9242.2026.04.010

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Equipment Environmental Engineering ›› 2026, Vol. 23 ›› Issue (4) : 104-113. DOI: 10.7643/issn.1672-9242.2026.04.010

Aviation and Aerospace Equipment

Constitutive Model and Failure Criterion Parameters of 1Cr21Ni5Ti Duplex Steel

LIU Yunshao, ZENG Shenghui, CHEN Junhong, YIN Biao, ZHANG Shengde, HUANG Xicheng

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Abstract

The work aims to construct a material model for describing the large deformation and failure behaviors of 1Cr21Ni5Ti duplex steel used in aerospace under a wide strain rate range. A progressive research method of “experimental testing-model improvement-parameter calibration” was adopted. Firstly, the mechanical properties of 1Cr21Ni5Ti duplex steel under quasi-static and high strain rates were tested with a material testing machine and a split Hopkinson tension bar device to clarify the influence law of strain rate on the yield strength and the strain hardening behavior of the material; Secondly, the traditional Johnson-Cook (J-C) constitutive model was improved based on this law by introducing a strain rate-dependent term for the strain hardening behavior; Finally, static and dynamic tensile tests on notched specimens were carried out to obtain the true strain field during deformation, and the average stress triaxiality and fracture strain of each specimen were calculated by combining with finite element simulation to determine the parameters of the J-C failure model. The results showed that the yield behavior and the strain hardening behavior of 1Cr21Ni5Ti duplex steel had obvious strain rate dependence, the improved J-C constitutive model could accurately describe the mechanical behavior of the material under a wide strain rate range, and the J-C failure model based on average stress triaxiality could effectively reflect the fracture characteristics of the material under different strain rates. It is concluded that strain rate is a key factor affecting the mechanical behavior and fracture characteristics of the material; the improved J-C constitutive model and the corresponding failure model have good applicability, which can meet the demand for accurate prediction in the aerospace field and provide support for the design and safety evaluation of related components.

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1Cr21Ni5Ti steel / constitutive model / failure model / strain rate / stress triaxiality

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LIU Yunshao, ZENG Shenghui, CHEN Junhong, YIN Biao, ZHANG Shengde, HUANG Xicheng. Constitutive Model and Failure Criterion Parameters of 1Cr21Ni5Ti Duplex Steel[J]. Equipment Environmental Engineering. 2026, 23(4): 104-113 https://doi.org/10.7643/issn.1672-9242.2026.04.010

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