Micromechanical Analysis of Crack Closure Mechanism for the Intelligent Material Containing TiNi Fibers. 1st Report, Modeling of Crack Closure Mechanism and Analysis of the Stress Intensity Factor.

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  • ＴｉＮｉ繊維含有インテリジェントマテリアルのき裂閉鎖機構のマイクロメカニックス解析　第１報　　き裂閉鎖機構のモデル化と応力拡大係数の解析
  • TiNi センイ ガンユウ インテリジェント マテリアル ノ キレツ ヘイサ キコウ ノ マイクロメカニックス カイセキ ダイ1ポウ キレツ ヘイサ キコウ ノ モデルカ ト オウリョク カクダイ ケイスウ ノ カイセキ

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Abstract

Micromechanical modeling of an intelligent material containing TiNi fibers is performed by taking into consideration of the existence of crack bridging fibers with transformation strain which corresponds to the total amount of shrinkage of the fiber. In modeling, thermal expansion strain due to the mismatch of thermal expansion coefficients between TiNi fiber and matrix is also considered. The stress and strain fields in the matrix, fibers, and fictious eigenstrain in cracks can be found, hence the total potential energy of the model will be derived from these fields. By using the total potential energy, the stress intensity factor at the tip of crack in the material will be expressed successfully in terms of the transformation strain of fibers and the thermal expansion strain occurred in the material.

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