纯铁材料动态力学性能测试及本构模型

doi:10.7527/S1000-6893.2013.0460

Abstract

Abstract:

To study the dynamic mechanical property and built constitutive model of pure iron material are the basis of engineering application and numerical simulation. The dynamic mechanical property test of pure iron material are carried out using Instron material testing system and split Hopkinson pressure bar apparatus under different strain rates (10^-3-5×10⁴s^-1) at room temperature and different temperature (200-800℃) at high strain rate 10⁴s^-1.The stress-strain curves of pure iron are measured at high temperatures and high strain rates. The test results show that the plastic flow stress of pure iron material is sensitive to strain rate and temperature and has the effect of strain hardening, strain rate hardening plasticizing effect and thermal softening. Based on the Power-Law constitutive model, the dynamic constitutive model parameter with high strain rates and high temperatures of pure iron material is obtained by fitting the test results. The model predictions have a good agreement with test data and the dynamic constitutive model can make a satisfied prediction to the mechanial behavior of pure iron materials under dynamic loads.

Key words: pure iron material, Power-Law constitutive model, stress-strain curves, flow stress, high strain rate, SHPB

CLC Number:

KONG Jinxing, CHEN Hui, HE Ning, LI Liang, JIANG Feng. Dynamic Mechanical Property Tests and Constitutive Model of Pure Iron Material[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2014, 35(7): 2063-2071.

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Dynamic Mechanical Property Tests and Constitutive Model of Pure Iron Material

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