聚碳酸酯在高应变速率下拉伸行为的实验与建模

Experimentation and Modeling of the Tension Behavior of Polycarbonate at High Strain Rates.

作者信息

Xu Yingjie, Gao Tenglong, Wang Jun, Zhang Weihong

机构信息

Engineering Simulation and Aerospace Computing (ESAC), Northwestern Polytechnical University, Xi'an 710072, China.

Mechanics Unit (UME), ENSTA-ParisTech, Paris, 91761 Palaiseau, France.

出版信息

Polymers (Basel). 2016 Feb 29;8(3):63. doi: 10.3390/polym8030063.

DOI:10.3390/polym8030063

PMID:30979160

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC6432511/

Abstract

A comprehensive understanding of the mechanical behavior of polycarbonate (PC) under high-rate loadings is essential for better design of PC products. In this work, the mechanical behavior of PC is studied during tensile loading at high strain rates, using a split Hopkinson tension bar (SHTB). A modified experimental technique based on the SHTB is proposed to perform the tension testing on PC at rates exceeding 1000 s. The effect of strain rates on the tension stress⁻strain law of PC is investigated over a wide range of strain rates (0.0005⁻4500 s). Based on the experiments, a physically based constitutive model is developed to describe the strain rate dependent tensile stress⁻strain law. The high rate tensile deformation mechanics of PC are further studied via finite element simulations using the LSDYNA code together with the developed constitutive model.

摘要

全面了解聚碳酸酯（PC）在高速加载下的力学行为对于更好地设计PC产品至关重要。在这项工作中，使用分离式霍普金森拉杆（SHTB）研究了PC在高应变率拉伸加载过程中的力学行为。提出了一种基于SHTB的改进实验技术，以在超过1000 s⁻¹的速率下对PC进行拉伸测试。在很宽的应变率范围（0.0005⁻4500 s⁻¹）内研究了应变率对PC拉伸应力⁻应变规律的影响。基于实验，建立了一个基于物理的本构模型来描述应变率相关的拉伸应力⁻应变规律。通过使用LSDYNA代码和所建立的本构模型进行有限元模拟，进一步研究了PC的高速拉伸变形力学。