引張試験中のひずみ分布の連続計測と応力-ひずみ関係に関する考察

摘要

Displacement distribution in plate specimens of metallic materials during tensile test was measured using digital image correlation (DIC) method. Video image of the specimen surface was continuously taken during tensile test and static images were selected from the movie file after the test. Displacement distribution on the specimen surface was measured and strain distribution was derived during the whole tensile test. Stress-strain relation was considered until final stage of tensile test based on the local strain appeared on the specimen.%著者らは，金属材料の引張試験中における表面ひずみの 分布を画像を用いて非接触に連続的に測定する方法を適用 してきた.弾性変形，降伏点および塑性変形の各段階にお いてひずみ分布を画像相関法により測定し，試験過程にお ける変化を定量的に評価する方法について検討した.一般 構造用の鋼材などについて，降伏過程中のひずみ分布の変 化，加工硬化過程中のひずみ分布の変化およびくびれ発生 以降の局所変形部のひずみなどを測定した.