Experimental investigation and modeling of the tension behavior of polycarbonate with temperature effects from low to high strain rates
Experimental investigation and modeling of the tension behavior of polycarbonate with temperature effects from low to high strain rates
复制标题
从低应变率到高应变率的温度影响下聚碳酸酯拉伸行为的实验研究和建模
DOI：
10.1016/j.ijsolstr.2014.03.026
复制
发表时间：
2014-06-15
影响因子：
3.6
通讯作者：
Wang, Yu
中科院分区：
文献类型：
--
作者：
Cao, Kan;Wang, Yang;Wang, Yu
在较宽的应变速率范围（0.001 ~ 1700 s(-1)）和温度范围（0 ~ 120℃）下，研究了应变速率和温度对聚碳酸酯拉伸应力-应变响应的影响。改进的分离式霍普金森拉力杆用于高速率单轴拉力试验。实验结果表明，在高应变速率下聚碳酸酯的应力-应变响应表现出明显的屈服和应变软化等非线性特征。拉伸行为强烈依赖于应变速率和温度。屈服时的屈服应力和应变值在较高应变速率下显著增大，随温度升高而减小。此外，聚碳酸酯拉伸屈服行为存在显著的速率敏感性转变。在实验研究的基础上，建立了玻璃聚合物有限变形的三维弹塑性本构模型，以表征聚碳酸酯在拉伸载荷作用下的屈服和后屈服行为。在研究的应变速率和温度范围内，模型结果与实验数据接近。(C) 2014 Elsevier Ltd.版权所有。
The effects of strain rate and temperature on the tension stress-strain responses of polycarbonate are experimentally investigated over a wide range of strain rates (0.001-1700 s(-1)) and temperatures (0-120 degrees C). A modified split Hopkinson tension bar is used for high-rate uniaxial tension tests. Experimental results indicate that the stress-strain responses of polycarbonate at high strain rates exhibit the nonlinear characteristics including the obvious yielding and strain softening. The tension behavior is strongly dependent on the strain rate and temperature. The values of yield stress and strain at yield present a dramatic increase at higher strain rates and decrease with the increase in temperature. Moreover, there exists a significant rate-sensitivity transition in the polycarbonate tension yield behavior. Based on the experimental investigation, a physically based three-dimensional elastoplastic constitutive model for the finite deformation of glassy polymers is used to characterize the rate-temperature dependent yield and post-yield behavior of polycarbonate when subjected to tension loading. The model results are shown close to the experimental data within the investigated strain-rate and temperature ranges. (C) 2014 Elsevier Ltd. All rights reserved.