Influence of strength and notch shape on crack initiation and propagation behavior of advanced high strength steel sheets

Masaki Omiya, Seiya Arakawa, Zhenduo Yao, Mayu Muramatsu, Shinnosuke Nishi, Kenji Takada, Masanobu Murata, Kazuaki Okato, Kensuke Ogawa, Kai Oide, Takaya Kobayashi, Jike Han, Kenjiro Terada

研究成果: Article査読

抄録

Advanced high-strength steels (AHSSs) are widely adopted in car body structures to achieve weight reduction for energy efficiency and crash safety. This study investigates the effects of material strength and notch shapes on crack initiation and propagation behaviors in AHSS sheets used in car body structures. Tensile tests were conducted for three types of Japanese grade AHSS (JSC590, JSC980, and JSC1180) specimens and two notch root radii (R0.5 and R5). The crack initiation and propagation behaviors were found to strongly depend on the material strength and notch root radius. The crack generated from the notch root for the R0.5 specimens, whereas it generated from 1 to 2 mm inside the notch root for the R5 specimens. Unstable crack propagation occurred beyond the maximum load for the R5 and JSC1180 specimens, whereas only stable crack propagation occurred for the R0.5 specimens. From the digital image correlation analyses, we found that the specimen notch radius affects the stress triaxiality and equivalent plastic strain around the notch root. The JSC980 material had the highest crack initiation energy, which correlates with the plastic dissipation energy utilized for thickness reduction. The JSC590 material exhibited the highest crack propagation energy, which correlates with the true fracture strain.

本文言語English
論文番号108573
ジャーナルEngineering Fracture Mechanics
271
DOI
出版ステータスPublished - 2022 8月

ASJC Scopus subject areas

  • 材料科学(全般)
  • 材料力学
  • 機械工学

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