摘要
聚氨酯(PU)因具有优异的物理化学性能,常用于一般工业与民用建筑中的屋面、地下室、浴室、卫生间地面等防水工程,但在长期服役过程中,难免会产生裂纹或微孔等缺陷,裂纹地萌生与扩展将劣化材料的使用性能,降低材料构件的承载力,甚至导致结构失效或安全事故。本文通过平面拉伸试验,探究了不同拉伸速率下聚氨酯裂纹板的力学性能及其裂纹扩展规律,研究结果表明,拉伸速率对裂纹板的应力应变关系、断裂失效时间以及裂纹扩展规律均有一定影响。
Polyurethane(PU)is often used in waterproof engineering such as roofs,basements,bathrooms,and toilet floors in general industrial and civil buildings due to its excellent physical and chemical properties.However,in the long-term service process,cracks or micropores will inevitably occur.The initiation and expansion of cracks will degrade the performance of materials.It will reduce the bearing capacity of material components,and even lead to structural failure or safety accidents.In this paper,the mechanical properties and crack propagation law of polyurethane cracked plates under different tensile rates were investigated by plane tensile test.The results show that the tensile rate has a certain influence on the stress-strain relationship,fracture failure time and crack propagation law of the cracked plate.
作者
魏超
WEI Chao(Xiangtan University,College of Civil Engineering)
出处
《广东建材》
2024年第3期88-90,共3页
Guangdong Building Materials
关键词
平面拉伸
聚氨酯
裂纹扩展
应力应变
应力集中
Plane tension
Polyurethane
Crack propagation
Stress-strain
Stress concentration
