Dynamic state performance and constitutive relation of polycarbonate for bullet cores

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Journal of Vibration and Shock ›› 2019, Vol. 38 ›› Issue (5) : 7-12.

WANG Jiangbo1, GAO Guangfa1, DU Zhonghua1, XU Lizhi1, LIU Kun2, PIAO Chunhua3

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Abstract

In order to study dynamic response of polycarbonate material for bullet cores under impact, static and dynamic state compressive performances of the material under different strain rates were tested and analyzed with a material testing machine and SHPB device to obtain stress-strain curves of polycarbonate under different stain rates. The test results showed that the compression process of polycarbonate material reveals obvious viscoelastic phenomenon; with increase in strain rate, its static and dynamic state yield strengths and elastic moduli increase; its plastic stage is the result of interaction between strain softening and strain hardening, and its plastic stress-strain curves’ tangential moduli under different strain rates approximately equal. Based on the test results, a visco-elastoplastic constitutive model describing polycarbonate material’s large deformation mechanical behavior was established, and this material’s constitutive equations were obtained. The contrastive analysis showed that the model can more correctly describe dynamic and static state compression behaviors of polycarbonate material.

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Dynamic mechanical properties / Visco-elastoplastic / Constitutive model / Polycarbonate (PC)

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WANG Jiangbo1, GAO Guangfa1, DU Zhonghua1, XU Lizhi1, LIU Kun2, PIAO Chunhua3. Dynamic state performance and constitutive relation of polycarbonate for bullet cores[J]. Journal of Vibration and Shock, 2019, 38(5): 7-12

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