摘要
对含孔洞聚合物材料平面应力拉伸失效过程中由于不可逆变形引起的热量生成进行了实验研究，利用红外测温技术观测、记录和初步分析了孔洞局域温度场的形成和演变规律。研究表明，聚合物材料的损伤与断裂过程是热力耦合的，在我们的具体实验中，材料宏观破坏时的生成热约为外力功的４４％ ，可见，它对材料失效的影响是不可忽略的。同时，结合形变的微观和细观物理机制，对实验中观测到的变温规律作了初步的定性解释。
Experimental studies on heat generation caused by any irreversible deformation of polymeric material with voids under uniaxial tensile plane stress were presented in this paper. The initiation and evolution laws of the local temperature field near voids are observed and recorded with infraced photography, and then preliminarily analyzed. It is shown that the damage and fracture process of polymeric materials are thermomechanical coupling and, in experiments, the heat generated in the rupture process of ABS comprises some 44% of the external work, so the thermomechanical coupling effect on the repture of materials is not negligible. Also considering the micro and mesoscopic physical characters of deformation of materials, a preliminary and qualitative explanation of the temperature changing law observed in the experiment is given in this paper.
出处
《高分子材料科学与工程》
EI
CAS
CSCD
北大核心
1999年第6期138-141,共4页
Polymer Materials Science & Engineering
基金
国家自然科学基金
关键词
温度场
热量生成
热力耦合
断裂
高聚物
temperature field, heat generation, thermomechanical coupling, fracture of polymers
