Research on Energy Absorption Characteristics of Dual-phase Steel Based on Micro-crystalline Phase Modeling

doi:10.3901/JME.2016.04.120

Abstract

Abstract: Based on the Voronoi tessellation and probability theories, a material modeling method of micro-crystalline phase and its realization process are proposed, and a visual geometric model of micro-crystalline phase is established. Through the combination of micro-crystalline phase generating system and finite element(FE) solver, ABAQUS, FE simulation for dual-phase steel based on micro-crystalline phase modeling can be achieved. In the simulation, the ferrite and martensite of single phase are both simulated by the ideal elastic-plastic model, and the material damage behavior is simulated using ductile damage model. On this basis, a series of micro-crystalline phase simulation models of different grain sizes and different martensite volume fractions for dual-phase steel are established, and the energy absorption characteristic of dual-phase steel is studied. It is found that though the energy absorption for dual-phase steel varies with the grain sizes slightly, the overall trend for all is increased first and then decreased with increasing the martensite volume fraction. The martensite volume fractions for dual-phase steel of optimal energy absorption are all within the range of 2% to 5%. The energy absorption research of dual-phase steel under micro-scale is realized, and guidance for selection of lightweight body safety components is provided.

Key words: body safety components, crystalline phase modeling, dual-phase steel, energy absorption characteristic

CLC Number:

U465

ZHUANG Weimin, XIE Dongxuan, YE Hui. Research on Energy Absorption Characteristics of Dual-phase Steel Based on Micro-crystalline Phase Modeling[J]. Journal of Mechanical Engineering, 2016, 52(4): 120-125.

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