Prof. Nao-Aki Noda, Kyushu Institute of Technology, Japan

Nao-Aki Noda received his Ph.D. degree in Mechanical Engineering from Kyushu University, Japan in 1984. He has been doing research and teaching at Kyushu Inst. Tech., Kitakyushu, Japan, 1984-87, He is an author of Theory of Elasticity useful for engineers and a co-author of Safety Engineering for Workers in Industry and other several books. He is a co-editor of Stress Intensity Factors Handbook, vol. 4 & 5, Advances in Finite Element Analysis for Computational Mechanics. He is a recipient of Outstanding Paper Medal of Japan Soc. Tech. Plasticity, Sokeizai Industry Technology award from the Materials Process Tech. Ctr., a fellow of JSME (Japan Soc. Mech. Engrs.) and a fellow of JSAE (Soc. Automotive Engrs. Japan), JSMS Award for Academic Contribution and JSME Materials and Mechanics Division Award. He Achievements include researches in stress analysis for notched material testing specimens, and development for large ceramics structures used for steel manufacturing machinery and special bolt-nut connection improving anti-loosening and fatigue strength.

Speech Title: New adhesive strength evaluation method based on the singular stress field considering three dimensional joint geometry

Abstract: Adhesive joints are extensively used for various manufacturing processes in different industrial sectors. However, different materials properties cause the singular stress field, whose intensity is depending on the adhesive joint geometry. Our previous studies showed that debonding strength can be expressed as a constant value of the critical intensity of singular stress field (ISSF) by using two-dimensional modeling. By considering the real specimen geometry, in this study, the ISSFs along the interface side of three-dimensional joints are shown by varying the adhesive thicknesses. A mesh-independent technique combined with three-dimensional finite element method (FEM) is shown to evaluate the three-dimensional ISSF. It is found that the critical ISSF considered 3D geometry is almost constant independent of the adhesive thickness. The validity of two-dimensional modelling is discussed with the effect of the corner radius on the ISSF. The usefulness of the proposed new evaluation method is shown for several adhesive joint geometries.