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在断裂力学中,应力强度因子K_1是一个主要数据之一。因此,K_1的计算是断裂力学的一个重要内容。本文只讨论三点弯曲试样(图1)及紧凑拉伸试样(图2)的应力强度因子K_1的表达式。一、K_1的简便计算式为了测试材料的断裂韧度值,必须知道相应条件下裂纹尖端的应力强度因子K_1值。美国材料试验协会(ASTM)1972年公布的标准试验ASTME399-72中把三点弯曲试样和
In fracture mechanics, the stress intensity factor K_1 is one of the main data. Therefore, the calculation of K_1 is an important part of fracture mechanics. This article only discusses the expression of the stress intensity factor K_1 of a three-point bending specimen (Fig. 1) and a compact tensile specimen (Fig. 2). First, the simple calculation of K_1 In order to test the fracture toughness value of the material, it is necessary to know the stress intensity factor K_1 value of the crack tip under the corresponding conditions. The ASTM 399-72, a standard test published by the American Society for Testing and Materials (ASTM) in 1972,