A strain-gradient formulation for fiber reinforced polymers: hybrid phase-field model for porous-ductile fracture
A strain-gradient formulation for fiber reinforced polymers: hybrid phase-field model for porous-ductile fracture
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DOI：
10.1007/s00466-021-02018-0
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发表时间：
2020-07
影响因子：
4.1
通讯作者：
Maik Dittman;Jonathan Schult;F. Schmidt;C. Hesch
中科院分区：
文献类型：
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作者：
Maik Dittman;Jonathan Schult;F. Schmidt;C. Hesch
提出了一种新的数值方法来分析复合材料的力学行为，包括非弹性状态到最终失效。因此，将二次梯度理论与相场方法相结合来进行断裂分析。特别地，我们假设聚合物基质材料经历延性断裂，而连续嵌入的纤维经历脆性断裂，因为它是典型的，例如对于粗纱玻璃增强热塑性塑料。一个混合相场法的开发和应用沿着与一个修改后的Gurson-Tvergaard-Needelman GTN型塑性模型占温度依赖性增长的微尺度上的空洞。机织物的微观结构的机械响应引起额外的高阶项，表示纤维的均匀弯曲贡献。最后，对这种物理上全面的多场配方进行了一系列测试，以研究长纤维增强聚合物中不同类型和顺序的失效。
A novel numerical approach to analyze the mechanical behavior within composite materials including the inelastic regime up to final failure is presented. Therefore, a second-gradient theory is combined with phase-field methods to fracture. In particular, we assume that the polymeric matrix material undergoes ductile fracture, whereas continuously embedded fibers undergo brittle fracture as it is typical e.g. for roving glass reinforced thermoplastics. A hybrid phase-field approach is developed and applied along with a modified Gurson–Tvergaard–Needelman GTN-type plasticity model accounting for a temperature-dependent growth of voids on microscale. The mechanical response of the arising microstructure of the woven fabric gives rise to additional higher-order terms, representing homogenized bending contributions of the fibers. Eventually, a series of tests is conducted for this physically comprehensive multifield formulation to investigate different kinds and sequences of failure within long fiber reinforced polymers.