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Evaluation of Stress State and Fracture Strain of High-Strength Steel Using Stereo Image Correction

Ryo Sugimoto, Sota Ikoma,Keisuke Iizuka,Satoru Yoneyama,Kuniharu Ushijima,Shota Chinzei

Advancements in Optical Methods, Digital Image Correlation & Micro-and Nanomechanics, Volume 4（2023）

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Abstract
A method for evaluating the stress state and fracture strain of the thin sheet of high-strength steel is studied in this chapter. Displacements and strains on the surface of high-strength steel plates are measured using stereo image correlation (DIC). The stress–strain relation after the necking is obtained from the load and strains by inverse problem analysis using the virtual field method. The stresses obtained by the proposed method are well balanced with the external forces.
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Key words
fracture strain,steel,high-strength
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