Evaluations and Modelling of Residual Stress of a joining- Sialon to Austenitic Stainless Steel

• Main Author: Tan , Min Chuan, Jason
• Format: Final Year Project
• Language: English
• Published: Universiti Teknologi Petronas 2008
• Subjects: TJ Mechanical engineering and machinery
• Online Access: http://utpedia.utp.edu.my/7918/1/2008%20Bachelor%20-%20Evaluation%20And%20Modelling%20Of%20Residual%20Stress%20Of%20A%20Joining-Sialon%20To%20Austenitic%20Sta.pdf; http://utpedia.utp.edu.my/7918/

It is not easy to join ceramic to metal due to the differences in the coefficient of thermal expansion of the two materials. The residual stress present has caused failure to the joining. Materials with a relatively low elastic modulus can accommodate strain and will tend to deform under the influence of this stress, while brittle materials such as glasses and ceramics, will have a tendency to fracture. The evaluations and modelling of residual stress of a joining-sialon to austenitic stainless steel was simulated using Finite Element Analysis (ANSYS 1 0) software and simple analytical model was used to evaluate the residual stress. The joining process was assumed as direct diffusion bonding. The stress contour plot was discuss based on failure criteria. It is found that at the area nearby the joining interface, stainless steel experiences tensil~ stress while ceramic experiences compressive stress. The stress intensity is the highest at a few points at the ceramic interface compared to the steel interface. Crack occurred at these points due to the mismatch of thermal expansion and the inability of ceramic to withstand the high concentration of tensile stress.