The department of joining mechanics and analyses is dedicated to solve structural manufacturing and application problems, in which various phenomena, i.e. heat sources, materials, processes, and mechanics, coupled in the welding, joining, and additive manufacturing, are revealed by numerical simulation based on mathematical modeling and Artificial Intelligence.
　The main objective is to carry out fundamental research to elucidate multi-physical phenomena during manufacturing structures by welding/joining based on AI computational science and advanced experimental measurement technology. In this department, new solution methods, including the nonlinear finite element method, IGA method that uses CAD directly and inverse analysis, and their corresponding software JWRIAN, are being developed. Additionally, the inherent strain method and the contour method have been developed and applied to measure the internal three-dimensional residual stress distribution with the aid of the X-ray diffraction method. Furthermore, a micro-mechanical test system equipped with digital image correlation (DIC) technology is utilized to evaluate the local performance of welds and heat-affected zones (HAZ). Recently, a digital twin for welded joints and an M-FEM solution method integrating measurement data and the finite element method are being developed.
　This department is establishing both the virtual column of AI computational science, JWRIAN software and physical column of advanced measurement technology to support the practical structures based on welding/joining/additive manufacturing processes.