DCB testing of thermoplastic composites: A non-linear micro-macro numerical analysis
DCB testing of thermoplastic composites: A non-linear micro-macro numerical analysis
复制标题
热塑性复合材料的 DCB 测试：非线性微观宏观数值分析
DOI：
10.1016/s0266-3538(96)00166-2
复制
发表时间：
1997
影响因子：
9.1
通讯作者：
R. Keunings
中科院分区：
文献类型：
--
作者：
F. Dubois;R. Keunings
对单向热塑性基复合材料 DCB 试验中塑性变形的发展进行了微观-宏观有限元分析。目的是了解实验观察到的韧性相对于纯基体下降的机制。我们计算裂纹尖端附近的复杂应力和应变场。在此基础上，对断裂韧性和塑性能的估计进行了数值预测。讨论了玻璃纤维增强无定形聚芳酰胺基体的结果。我们发现塑性区的尺寸不受增强材料的限制。正如实验观察到的，断裂韧性和塑性能量密度的数值预测显示相对于纯基体的断裂韧性和塑性能量密度有所下降。
A micro-macro finite-element analysis is presented of the development of plastic deformation in DCB tests on unidirectional thermoplastic-matrix composites. The objective is to understand the mechanisms responsible for the experimentally observed decrease in toughness relative to the pure matrix. We compute the complex stress and strain fields near the crack tip. On that basis, estimates of fracture toughness and plastic energy are predicted numerically. Results are discussed for a glass-fiber-reinforced amorphous poly(arylamide) matrix. We find that the plastic zone is not restricted in size by the reinforcement. Numerical predictions for fracture toughness and plastic energy density show a decrease relative to those of the pure matrix, as observed experimentally.