摘要
采用真空辅助成型工艺制备单向玻璃纤维增强环氧树脂基的[±45°]_(8s)复合材料试样,通过专用试验设备开展恒定应变率下的面内剪切性能研究,应变率范围为3×10^(-4)~128.4s^(-1)。以Khan-Huang本构关系模型表达形式为基础,考虑应变率效应,建立了一种单向玻璃纤维增强环氧树脂基复合材料在中等应变率下的剪切本构模型,通过最小二乘法和遗传算法获得了最优本构参数。结果表明,单向玻璃纤维增强环氧树脂基复合材料的剪切性能具有应变率敏感性,剪切强度随着应变率的提高逐渐增大,在128.4s^(-1)时极限强度提高了35.5%。建立的本构关系模型能够准确反映剪切性能与应变率的关系,可用于中等应变率条件下的剪切性能预测。
Angle-ply of[±45°]8s unidirectional glass fiber reinforced epoxy composites were made by vacuum assisted molding process.The shear properties under constant strain rate were researched by special equipment.Test strain rate was from 3×10^-4 s^-1 to 128.4 s^-1.A shear rate-dependent constitutive model of unidirectional glass fiber reinforced epoxy composite under intermediate strain rate was established based on Khan-Huang model.The optimal parameters were identified by least square method and genetic algorithm.The results show shear properties of unidirectional glass fiber reinforced epoxy composite depends on strain rate and shear strength increases with strain rate.The ultimate strength increases by 35.5% at 128.4 s^-1.Constitutive model established in this paper can accurately reflect the shear properties of unidirectional glass fiber composite,and can be used to predict shear properties under intermediate strain rate.
出处
《复合材料学报》
EI
CAS
CSCD
北大核心
2018年第2期304-310,共7页
Acta Materiae Compositae Sinica
基金
江苏省自然科学基金-青年基金(BK20160201)
关键词
中等应变率
单向玻璃纤维增强环氧树脂基复合材料
剪切性能
本构关系
参数识别
intermediate strain rate
unidirectional glass fiber reinforced epoxy composites
shear property
consti-tutive relationship
parameters identification
