An Experimental and Numerical Hybrid Technique for Reconstructing Boundary Condition in Elastic Analysis

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  • 弾性解析領域の境界条件を再構築する実験―数値ハイブリッド解析
  • ダンセイ カイセキ リョウイキ ノ キョウカイ ジョウケン オ サイコウチク スル ジッケン スウチ ハイブリッド カイセキ

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Abstract

The authors developed a new hybrid method combining digital image correlation (DIC) with finite element method (FEM) in case of elastic deformation fields. DIC and FEM can calculate the displacement, strain and stress distribution in the full-fields. But DIC includes inevitably experimental error, for example, correlation error and limit of resolution. On the other hand FEM involves serious problem whether selected boundary condition is correct or not. In the present paper, first, the proposed hybrid technique is demonstrated based on the intelligent hybrid technique developed by Nishioka for reducing experimental error. This proposed technique can reconstruct the boundary condition from results of full field displacement distribution obtained by DIC, then calculate the full field displacement using determined boundary condition. This result can assure the satisfaction of the equilibrium equation. In addition, in order to verify the effectiveness of proposed hybrid method, the authors perform experiment of tensile test plate with a hole using DIC method, and comparison of the results obtained by theory, experiment, current hybrid and proposed hybrid. As a result, proposed method is indicated a more effective than experiment and current hybrid technique.

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