摘要
对中部开环绕裂纹的圆柱形铝合金试件进行扭转实验,实验过程中裂纹前缘会受到面内剪应力作用下而产生Ⅲ型裂纹起裂,并测得铝合金的Ⅲ型断裂韧度。另外,通过有限元数值计算,可获得裂纹尖端附近的应力场,根据断裂力学理论可推算出试件的Ⅲ型裂纹断裂韧度。比较两种方法得到的断裂韧度值,从而获得实测值与数值解的一致性,这可为铝合金抵抗Ⅲ型裂纹断裂破坏提供依据,同时也为其他材料Ⅲ型裂纹断裂韧性的求解提供参考。
The torsion test was carried out on the cylindrical aluminum alloy specimen with central crack opening. In the experiment, the crack front edge would be subjected to in-plane shear stress and generate type Ⅲ crack initiation, and the type Ⅲ fracture toughness of aluminum alloy was measured. In addition, through the finite element numerical calculation, the stress field near the crack tip can be obtained, and the Ⅲ type crack fracture toughness of the specimens can be calculated according to the theory of fracture mechanics. By comparing the fracture toughness obtained via the two methods, the consistency between the measured value and the numerical solution can be obtained, thus providing a basis for the resistance of aluminum alloy against Ⅲ fracture failure and reference for other materials’ solutions to the type Ⅲ crack fracture toughness.
作者
徐志强
任毅斌
胡国强
宋小雨
刘云刚
Xu Zhiqiang;Ren Yibin;Hu Guoqiang;Song Xiaoyu;Liu Yungang(CHINALCO Material Application Research Institute Co.,Ltd.,Beijing 102209,China)
出处
《轻金属》
北大核心
2021年第2期47-50,共4页
Light Metals
关键词
Ⅲ型裂纹
铝合金
断裂力学
数值计算
Ⅲ type fracture
aluminum alloy
fracture mechanics
numerical calculation
