中文翻译材料.doc

Fracture Toughness of Si3N4/S45C Joint with an Interface Crack Liedong Fu, Yukio Miyasita and Yoshiharu Mutoh Copyright AD-TECH.; licensee AZoM.com Pty Ltd. This is an AZo Open Access Rewards System (AZo-OARS) article distributed under the terms of the AZo–OARS?/oars.asp?which permits unrestricted use provided the original work is properly cited but is limited to non-commercial distribution and reproduction. Posted: September 2005 Topics Covered Abstract Keywords Introduction Experimental Specimen Preparation Experimental Results Oscillatory Singular Stress Field of The Interface Crack and The Maximum Normal Stress Criteria Elasto-Plastic Singular Stress Field at The Interface Crack Tip Fem Analysis and Evaluation of Fracture Path and Toughness Based on the Elasto-Plastic Stress Intensity Factors Conclusions References Contact Details Abstract Fracture toughness tests were carried out for Si3N4/S45C specimens with interface cracks of different lengths.??It was found that the specimen with a crack of 4 mm has higher apparent fracture toughness than those with cracks of 1 mm and 2 mm due to the reduction of the residual stress.??Fracture propagated into Si3N4?from the crack tip in the direction of 40o?for cracks of 1 mm and 2 mm while it propagated along the interface for crack of 4 mm.?Elasto-plastic analysis was carried out considering S45C as the linear hardening material and Si3N4?as the elastic material.??It was found that the stress around the crack tip is dominated by an elasto-plastic singular stress field, which is substantially the same as the elastic singular stress field of an interface crack.??Evaluation of the fracture path and toughness was carried out based on the stress intensity factors of the elasto-plastic singular stress field. Keywords Interface Crack, Fracture Toughness, Si3N4/S45C Joint, Thermal Residual Stress, Elasto-plastic Analysis Introduction The ceramic/metal joints have been increasingly applied in a wide range of engineering fields bec