The Influence of Pore Defects Distribution Characteristic on Casting Service Performance and Fatigue Life

Abstract

Pore defect is a kind of typical non-continuous casting defect. It always brings local stress concentration and fatigue crack. The distribution charactersic of pores has greatly influence on the fatigue life. In this study, distribution characterstic of pore has described by pore to surface distance (S) and pore dispersion coefficient (r). By numerical simulation method, stress and fatigue life distribution law in the test bar have been studied under different and . Under the same load condition and pore volume fraction, the stress concentration factor (Kt) will increase and fatigue life will decrease following pore to surface distance (S) decreasing and dispersion degree (r) increasing within a limitation. The influence of pore to surface distance (S) is more obvious than the pore dispersion coefficient (r) on fatigue life of the casting.