窒化ケイ素の曲げ強度に及ぼす研削加工の影響に関する実験的検討と数値シミュレーション

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Three Point bending tests were conducted using specimens of sintered silicon nitride ground in six types of condition, Which were prescribed by the combination of the mesh-size of grinding wheel and the cutting depth. It was revealed by the Weibull statistical analysis that the stength was higher and its scatter was less in Specimens ground by using a grinding wheel with larger abrasive grains. The re1ative estimation of residual stress induced by grinding was tried by using the in1dentation一flaw method to evaluate the fracture toughness simply. In this case, the crack formation resistance ratio, Which was defied as the apparent fracture toughness measured on the ground surface divided by that on the surface without residual stress, was proposed to correlate the stength depending on the grinding condition. The crack formation resistance ratiobecame larger with anincrease of strength. The tendency was ascribed to the variation of the intensity of compressiveresi dualstressdependingo the grinding condition. A simulation was carried out to discuss the dominant factor to affect the relation between the strength distribution and the grinding cofldition. In the ana1alysis, the fracturemech anicsmodelfor cracks located in the regio Subjected to tefisilestress was combined with the Monte Carlo simulation. The simulated result presented similar characteristics of the strength distributionas observe dexperi-mefitally. The characteristics of the strength distributi on was successfu1 1yex plained by introducing the concep of superposi gdistinct strength distribution depending on the crack geometry.
社団法人日本材料学会の論文
1991-02-15

窒化ケイ素の曲げ強度に及ぼす研削加工の影響に関する実験的検討と数値シミュレーション

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