セラミックス/金属接合体の破壊機構と残留応力挙動の相関性

概要

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In order to clarify the correlation of the fracture mechanism and the behavior of the residual stress in the ceramic/metal joint, the residual stress was measured by X-ray diffraction method during applied bending stress. Sintered silicon nitride (Si_3N_4) and stainless steel (SUS304) were used as specimen materials. The stress analysis by finite element method (FEM) was carried out, and was compared with X-ray measurement results. The obtained results were as follows: (1) The measured stress was larger with the applied stress. (2) As the applied stress was larger, intensity of the stress singularity, K was larger and λwhich shows the order of the stress singularity was smaller and then became constant. (3) The behavior of K and λ agreed in the experimental results and the analytical results qualitatively well. (4) At the low-loaded region, there was a difference for the behavior of K and λ depending on the shape and dimension of specimen. But, when the applied stress was larger, K and λbecome constant respectively. (5) To observe the change of stress singularity at the interface, it is possible to estimate the stress of fracture initiation.
社団法人日本材料学会の論文
2001-10-15