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Equivalent plastic solid materials of perforated plates based on effective stress ratio

有効応力概念に基づく多孔板の塑性等価中実材の検討

笠原 直人*; 高正 英樹*; 川崎 信史 ; 安藤 勝訓 

Kasahara, Naoto*; Takasho, Hideki*; Kawasaki, Nobuchika; Ando, Masanori

本件では、多孔板の等価中実モデルの設定手法について提案した。弾塑性解析はその解が構成則に依存することにその困難さがあり、この問題を解決するために多孔板の塑性挙動について系統的に調査を実施した。これらの研究により多孔板の平均応力と母材の応力比で定義される有効応力比(ESR)の存在を明らかにした。ESRは幾何学的なパラメータ関数であり、構成方程式から独立したものである。したがって、ESRを採用することにより母材の構成方程式の種類によらず多孔板の塑性変形を表現できる。

The method to determine equivalent solid materials of perforated plates was proposed. One of difficulties of plastic analysis is dependency of their solutions on constitutive equations. To overcome this problem, plastic behaviors of perforated plate were systematically investigated on various kinds of constitutive equations. These studies have found existence of the effective stress ratio (ESR) which is defined as the stress ratio between average stress of perforated plates and solid plates of base materials. The ESR is a function of geometrical parameters and is independent from constitutive equations. Therefore, the ESR can determine plastic solid materials of perforated plates from any kind of constitutive equations of base materials.

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