Calculation method, experimental method and experimental device of V-shaped cutting groove tip stress intensity factor under pure shear loading

Abstract

The invention provides a calculation method, an experiment method and an experiment device for a V-shaped cutting groove tip stress intensity factor under pure shear loading, and the calculation method is based on a caustic method and comprises the steps: 1, selecting a plane to-be-measured object with a V-shaped cutting groove, and building an optical mapping relation between the plane of the to-be-measured object and a reference plane; 2, establishing a V-shaped cutting groove tip stress field expression; 3, establishing a relational expression between the initial curve radius r0 of a caustic and a stress intensity factor KII; 4, determining a caustic mapping equation of the V-shaped cutting groove under pure shearing loading; 5, establishing a relational expression between the characteristic length Dmax and the initial curve radius r0 of the caustic; and 6, determining the V-shaped cutting groove tip stress intensity factor KII under pure shear loading. The calculation method of theV-shaped cutting groove tip stress intensity factor KII under pure shear loading is obtained through research, and a new way is provided for obtaining the V-shaped cutting groove tip stress intensityfactor. The method has good precision and numerical stability.

Description

technical field [0001] The invention belongs to the field of fracture mechanics, in particular to the calculation of the stress intensity factor of a member containing a V-shaped notch, and relates to a calculation method, an experimental method and an experimental device for the stress intensity factor of a V-shaped notch tip under pure shear loading. Background technique [0002] In various engineering structures, whether it is a large civil building or a microelectronic structure, V-shaped notches are widely present. The existence of V-shaped notches can lead to problems of stress concentration and even stress singularity, thereby reducing the load-bearing capacity of structural members. Therefore, it is crucial to study the stress distribution around the tip of the V-groove. V-shaped notch belongs to a class of problems in fracture mechanics. The key to study the stress distribution at the tip of V-shaped notch is to determine the corresponding stress intensity factor a...

AI Technical Summary

Problems solved by technology

However, for the V-shaped notch under pure shear loading, there is still a lack of research on the theory and application of using the caustic method to solve the stress intensity factor at the tip.

Images