中国塑料

中国塑料 ›› 2007, Vol. 21 ›› Issue (4): 91-95.

• 标准与测试 • 上一篇    下一篇

PBT试样在不同加载速率下的断裂分析

于杰1,2,都佩华1,2,罗筑1,2，何敏1，蒋冠森1,2   

  1. 1.贵州大学材料与冶金学院，贵州贵阳550003;2.贵州省复合改性聚合物材料工程技术研究中心，贵州贵阳550014
  • 出版日期:2007-04-26 发布日期:2021-05-20

Effect of Loading Rate on the Tensile Fracture Properties of PBT Samples

YU  Jie1,2，DU Pe-hua1,2，LUO Zhu1,2,HE Min1，JIANG Guan-sen 1,2   

  1. 1 .College of Materials science&Metallurgical Engineering, Guizhou University,Guiyang 550003, China;2. Engineering Research Center for
    Compounding and Modification of Polymeric Materials, Guiyang 550014, China
  • Online:2007-04-26 Published:2021-05-20

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摘要： 研究了加率(v)对PBT伸性能 影,并对实验结果进行了分析。结果表明，随v增大试裂过 中裂纹扩展特征不同. 面形貌表现 由韧性 裂特征向脆性 裂特征变面平坦区比例参 Ap/Ao 随 增加先急剧增大.当v增大到1000mm/min以上时，Ap/Ao，增加缓慢；裂源处表面 度参 Rs和v呈线 性关系: PBT屈度σy随v增大先增大，当v增大到1000mm/min以上时σy基本不变；PBT logε~σy(ε为应变 率)曲线呈明显，两一线性关系，目低 ，直线斜率小于高 百线斜率，并 Eyring 度理论对 此结果进行了分析:后采用分子，，滑动机制解释了实验现象。

关键词: 聚对苯二甲酸丁二醇酯, 拉伸断裂, 加载速率, 断口形貌, 粗糙度

Abstract: The effect of strain rate(v) on the tensile behavior of PBT was studied. As the loading rate grew, the fractography transformed from ductile to brittle. The flat region ratio(Ap/Ao)increased rapidly with increasing loading rate initially and leveled off at 1000 mm/min. The study also showed that the roughness of fracture surface(Rs) increased linearly w ith strain rate according to Rs=2.10-4.72x10-4v. The yield stress( σy) increased rapidly with increasing strain rate and leveled off at 1000 mm/min. And the relationship between the yield stress and the strain rate was consistent with Eyring theory, and could be explained by the molecular chain sliding mechanics.

Key words: polybutylene terphthalate;tensile fracture, loading rate, fractography, roughness

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