Dynamic Stress Analysis of a Three-Dimensional Solid Body (Dynamic Stress Concentration Factor around a Cavity)

Abstract

The reflection and interference of stress-waves play important roles in dynamic cases.It is very desirable to study the value of dynamic stress concentration factors, in three-dimensional solid bodies.Hence,we have analyzed the stress propagation and the dynamic stress concentration phenomena around a spherical cavity in a cylindrical bar by utilizing the strain gage method, the dynamic photoelastic method and also the finite element method.Emphasis was laid on the dynamic stress concentration analysis of bodies with inner cavities such as those often found in welded parts or castings. The simulation was achieved by using test models of composite specimen geometry in which a spherical cavity was introduced by a variation of the sandwich method. We found that the three-dimensional dynamic stress concentration factor obtained by the present three methodsare all near the static stress concentration factors already reported for similar specimen geometries.