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本文研究了工程塑料——聚碳酸酯及聚对苯二甲酸丁二醇酯的微观断裂行为。研究中采用了静载和动载破断实验,用扫描电镜观察断裂形态特征,并结合宏观力学试验过程分析其断裂行为。实验结果表明,热塑性工程塑料,在加载速率及环境温度固定条件下,其微观断裂行为受材料损伤体积空间分布的影响,材料损伤体积宏观空间分布范围宽,则大分子相互协同动作强,应变均匀,微观塑性形变差别小,断口表面趋于平坦;反之,大分子相互协同动作差,应变易于集中,微观塑性形变差异大,断口表面高低起伏大。
In this paper, the micro-fracture behavior of engineering plastic-polycarbonate and polybutylene terephthalate is studied. In the study, static load and dynamic load test were used. The morphological characteristics of the fracture were observed by scanning electron microscopy. The fracture behavior was also analyzed with macroscopic mechanical test. The experimental results show that under the condition of constant loading rate and ambient temperature, the microstructural fracture behavior of thermoplastic engineering plastics is affected by the spatial distribution of material damage volume, and the macroscopic distribution of damage volume is wide. Therefore, the macromolecules have strong synergistic action and uniform strain , The difference of microscopic plastic deformation is small, and the fracture surface tends to be flat. On the contrary, the macromolecules have poor synergistic action with each other, the strain tends to be concentrated, the difference of micro plastic deformation is large, and the surface of the fracture is greatly fluctuated.