459 窒化ケイ素セラミックスのき裂開閉口挙動に及ぼす圧縮負荷の影響(GS-13 き裂(4))

西川 出; 小倉 敬二; 宮武 岳洋; 増川 功一

doi:10.1299/jsmezairiki.2001.0_469

2001

Session ID : 459

DOI https://doi.org/10.1299/jsmezairiki.2001.0_469

Conference information

459 Beneficial Effect of Compressive Loading on Crack Opening Behavior in Silicon Nitride Ceramics

Izuru NISHIKAWA, Keiji OGURA, Takahiro MIYATAKE, Koichi MASUKAWA

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Keywords: Crack closure, Crack opening displacement, Compliance, Stress shielding effect, Interlocking, Si_3N_4 ceramics, Compressive loading, Laser speckle gage

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Abstract

The effect of stress shielding near the crack tip in Silicon Nitride ceramics was investigated using the Laser speckle strain / displacement gage by which a small crack opening displacement(COD) can be measured. A special attention was put on the influence of compressive loading on the stress shielding effect. From the result of COD measurement, it was found that the COD in ceramics was strongly affected by the applied stress ratio. Especially, the compressive loading was found to play an important role on the development of the stress shielding effect.

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