纤维增强复合材料应变率效应的数值仿真

doi:10.13229/j.cnki.jdxbgxb20180430

摘要/Abstract

摘要：

为研究应变率效应对纤维增强复合材料仿真精度的影响，引入动态增强因子（DIF）对复合材料模量和强度进行修正，结合改进的Hashin失效准则，建立了可考虑应变率效应的复合材料三维渐进性损伤本构模型。将该模型通过VUMAT子程序嵌入Abaqus软件中，进行弹丸侵彻玻璃纤维增强复合材料层合板仿真，将仿真结果分别与试验结果和不考虑应变率效应的本构模型仿真结果进行了对比。结果表明：本文建立的含有应变率的本构模型，能较准确地模拟弹丸侵彻层合板过程；在1.8、3 m/s两种弹丸侵彻速度下，含应变率与不含应变率的仿真结果相比，精确度分别提高了14.1%、22.7%；对于不考虑应变率的本构模型，仿真误差随侵彻速度的增大而增加，由1.8 m/s的28.7%增大到3 m/s的36.9%，考虑应变率的本构模型仿真误差比较稳定。

关键词: 复合材料, 应变率效应, 本构模型, 用户子程序, 仿真精度

Abstract:

In order to study the influence of strain rate effect on the simulation precision of fiber reinforced composites, the Dynamic Enhancement Factor (DIF) is introduced to modify the modulus and strength of the composite. The modified Hashin failure criterion is used to establish a three-dimensional progressive damage constitutive model of composite materials, which considers the strain rate effect. The model is embedded into the Abaqus software by VUMAT subroutine, and the simulation of the projectile penetrating the fiberglass reinforced composite laminates is carried out. The simulation results are compared with the experimental results and the simulation results of the constitutive model without considering the strain rate effect. The results show that the constitutive model considering the strain rate effect can accurately simulate the process of projectile penetrating the laminate. Compared with the simulation results without strain rate effect, the accuracy is increased by 14.1% and 22.7% respectively by the proposed model, at the penetration speed of projectile at 1.8 m/s and 3 m/s. In the simulation of the constitutive model without considering the strain rate effect, the error increases from 28.7% to 36.9% as the penetration speed increases from 1.8 m/s to 3 m/s, however, the simulation error of constitutive model considering strain rate effect is relatively stable.

Key words: compound material, strain rate effect, constitutive model, user material subroutine, simulation accuracy

中图分类号:

U465.6

叶辉,朱艳荣,蒲永锋. 纤维增强复合材料应变率效应的数值仿真[J]. 吉林大学学报(工学版), 2019, 49(5): 1622-1629.

Hui YE,Yan-rong ZHU,Yong-feng PU. Numerical simulation of strain rate effect of fiber reinforced composites[J]. Journal of Jilin University(Engineering and Technology Edition), 2019, 49(5): 1622-1629.

图/表 7

图1

图2

图3

图4

表1

弹丸与层合板间最大接触力对比"

参数	试验值	仿真（含应变率）	仿真（不含应变率）
$最大接触力 / N$	407.94	348.39	290.87
$误差 / %$		14.6	28.7

表1

图5

表2

弹丸与层合板间最大接触力对比"

参数	试验值	仿真(含应变率)	仿真(不含应变率)
$最大接触力 / N$	925.86	794.37	584.58
$误差 / %$		14.2	36.9

表2

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