Analysis and Measurement of Residual Stresses Induced in Manufacturing Processes

ISfIM organized a distinguished lecture on Analysis and Measurement of Residual Stresses Induced in Manufacturing Processes on 2 August 2024 at School of Mechanical Engineering, Nanyang Technological University, Singapore. The lecture was given by Prof Nishu Ma, Professor at Joining and Welding Research Institute, Osaka University, Japan.

Lecture Abstract:

The analyzing and measuring methods for residual stresses induced in various manufacturing processes are reviewed. The application examples of these methods and numerically modelling approach to transient and residual stresses due to fusion welding, solid state joining and additive manufacturing are introduced. Finally, residual stress control or compressive residual stress generation approaches are briefly demonstrated.

Speaker Biography:

Prof Ninshu Ma went to Japan in 1989 after studying and working for 10 years at Xian Jiao Tong University in China. He received his PhD degree from Osaka University in 1994 and went on to work for 21 years as a professional consultant in the field of computer-aided engineering at Japan Research Institute (JRI). Currently, he is working as a professor at Joining and Welding Research Institute, Osaka University.

Prof Ma’s basic and theoretical research is on the development of computing methods and their FEM (Finite Element Method) software for analyses of multi-physical phenomena in joining and forming processes. JWRIAN, the software developed in Prof Ma’s laboratory, has been used to predict deformation and residual stresses not only in welded joints, but also in huge practical structures such as those in ships and other vehicles. Recently, Prof. Ma focuses this thermal-mechanical coupling analysis on various joining processes of dissimilar materials (metal/metal, metal/plastics, metal/CFRP, and metal/ceramic), as well as the additive manufacturing process and the assessment of structural components. Prof Ma serves as Associate Editor, Journal of Ship and Offshore Structures and Chairman, Laser Processing Committee, Japan Society of Technology of Plasticity.