摘要
由于材料内部缺陷和裂纹的存在,导致材料在使用过程中发生破坏的现象,已引起了广泛的注意,并发展了一门专门的学科——断裂力学。断裂力学不仅研究材料中裂纹扩展的规律,还通过应力及能量分析,建立和测定材料断裂的判据,如材料的断裂韧性,为结构设计提供必需的材料参数。目前断裂力学的研究对象已从金属和陶瓷扩充到聚合物和复合材料。
China-made poly (phenylene ether ketone) (PEK-C) is an amorphous high-performancethermoplast with glass transition temperature 231℃, and tensile modulus 2. 43GPa, tensilestrength 101 MPa and elongation at break 6.1% at room temperature. Single edge notchedspecimens were used to measure fracture toughness K_(1c) and critical strain energy releaserate G_(1c) in terms of linear elastic theory as well as critical J-integral value J_(1c) in termsof elastic-plastic theory. The values of K_(1c), G_(1c) and J_(1c) for PEK-C are, respectively,2. 34 MPam^(1/2), 2. 1 kJ/m^2 and 2. 76 kJ/m^2 compared wih K_(1c) 2. 86 MPa m^(1/2) and G_(1c) 2. 07kJ/m^2for PEEK of ICI and K_(1c) 1. 96 MPa m^(1/2) and G_(1c) 1 kJ/m^2 for PEKK of DuPont.
出处
《应用化学》
CAS
CSCD
北大核心
1990年第3期72-75,共4页
Chinese Journal of Applied Chemistry
基金
国家自然科学基金
关键词
聚芳醚酮
断裂
断裂韧性
polyphenylene ether ketone
fracture toughness
fracture
