インデンテーション法による各種構造用セラミックスの残留応力の推定・評価

概要

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In this study, residual stress was generated in several structural ceramics by sintering and grinding, then estimated using the Vickers indentation method. First, we investigated the appropriate pretreatment for measuring fracture toughness (basis value, K_C), while prevently any influence of residual stress. This is important in estimating residual stress using the Vickers indentation method. Based on that value, the residual stress in Al_2O_3 and Si_3N_4 ceramics was estimated by the Vickers indentation method. Next, several problems in estimating residual stress using the indentation method on ZrO_2 ceramics were discussed focusing on phase transformation. Results show that residual stress in Al_2O_3 and Si_3N_4 can almost be eliminated by annealing the specimen after hand grinding. Consequently, it is thought that this treatment method is effective for determining the basis value K_C. The estimated residual stress value on Al_2O_3 and Si_3N_4 obtained by the Vickers indentation method at 98N corresponded closely to the values obtained by X-rays. Compared with Al_2O_3 and Si_3N_4, residual stress in ZrO_2 estimated by the indentation method was larger than that found by the X-ray method. This is assumed to be the influence of phase transformation.
社団法人日本材料学会の論文
2003-01-15