Study on Hardening and Failure Behavior of the 3rd Generation Ultra-High Strength Steel QP1180

doi:10.3901/JME.2022.08.117

Abstract

Abstract: Ultra-high-strength steel (UHSS) are currently the most widely used lightweight materials in automobiles, and failure risk prediction during vehicle collisions is the main challenge currently facing the industry. Modified power law (MPL) hardening model is proposed to describe the hardening behavior of variable n-value materials, and hydraulic bulging test is used to verify the extrapolation results of different hardening models. Five loading case are designed in order to get fracture limit strain under different stress state, and the MMC fracture criterion parameters is fitted based on the experimental data. Optimization method is used to identify parameters of the GISSMO damage model, and the three-point bending test of hat profile is further designed to verify the characterization results of the hardening and failure characteristics. The results show that direct extrapolation result of the MPL hardening model is better than that of the Swift and H-S hardening models, and is more suitable for QP1180 material. The calibrated GISSMO damage model can well predict the failure behavior of the material under complicated nonlinear load path.

Key words: UHSS, QP1180, material hardening, fracture limit, GISSMO

CLC Number:

TG141

ZHANG Jichao, LIAN Changwei, HAN Fei. Study on Hardening and Failure Behavior of the 3rd Generation Ultra-High Strength Steel QP1180[J]. Journal of Mechanical Engineering, 2022, 58(8): 117-125.

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