摘要
目的对PC/ABS在高应变率下的压缩大变形行为进行实验研究与模拟。方法在应变率为1600~5000 s^(-1),温度为293~353 K的范围内,选用霍普金森压杆获取其在高应变率、高温下的大变形行为;选用DSGZ本构模型,模拟PC/ABS在高应变率下的大变形。结果 PC/ABS大变形行为强烈依赖于应变率和温度,屈服应力随应变率增加或温度降低而升高,大变形行为包括弹性、屈服、应变软化和应变硬化。结论DSGZ本构可准确模拟PC/ABS在高应变率、高温下的大变形行为。
A combined experimental and constitutive investigation has been performed to study the compressive large de- formation behavior of the blends of polycarbonate （PC） and acrylonitrile-butadiene-styrene （ABS） at high strain rates. A split Hopkinson pressure bar（SHPB） was used to characterize the large deformation behavior of PC/ABS at high strain rates for high temperatures, the investigated strain rates ranged from 1600 to 5000 s-1, and the investigated temperatures ranged from 293 to 353 K. The experimental results indicate that large deformation behavior of PC/ABS strongly depends on the strain rate and temperature, and the yield stress increases with the increasing strain rate or the decreasing temperature. To predict the large de- formation behavior of PC/ABS, the DSGZ constitutive model was employed, and it has been implemented into ABAQUS/Explicit through a user material subroutine VUMAT. In comparison with the experimental results, the DSGZ model can accurately predict the large deformation behavior of PC/ABS at high strain rates for high temperatures.
出处
《精密成形工程》
2017年第3期25-29,共5页
Journal of Netshape Forming Engineering
基金
国家自然科学基金(51125021)
关键词
PC/ABS
高应变率
大变形
本构模型
PC/ABS
high strain rate
large deformation
constitutive model
