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<p>In recent years, high-strength steel sheets have been increasingly applied to automotive bodies to achieve weight reduction and collision safety. However, higher strength reduces ductility, increasing fracture possibility during press forming. In bending, a smaller inner radius raises maximum circumferential strain on the outer surface, heightening fracture likelihood. Yet, small bending radii are often required for component performance, necessitating methods to enable fracture-free bending of high-strength steels. Two-step bending is known to improve bendability, but the effects of first-step radius and angle on strain in the second step remain unclear. This study investigates these effects through experiments and finite element simulations using V-bending and validates findings with pad bending. Results show: (1) Two-step bending reduces maximum strain; (2) Larger first-step radius disperses strain; (3) Smaller first-step angle introduces compressive strain, further reducing strain; (4) In pad bending, strain varies with distance to the bend apex, influenced by first-step parameters.</p>

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Influence of the First-step Bending Radius and Bending Angle on the Two-step Bending

  • 期刊论文

  • 发表日期：

    2026年6月16日

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  • Yuki Kitahara,
  • Tasuku Zeniya,
  • Kenichiro Ohtsuka

摘要

In recent years, high-strength steel sheets have been increasingly applied to automotive bodies to achieve weight reduction and collision safety. However, higher strength reduces ductility, increasing fracture possibility during press forming. In bending, a smaller inner radius raises maximum circumferential strain on the outer surface, heightening fracture likelihood. Yet, small bending radii are often required for component performance, necessitating methods to enable fracture-free bending of high-strength steels. Two-step bending is known to improve bendability, but the effects of first-step radius and angle on strain in the second step remain unclear. This study investigates these effects through experiments and finite element simulations using V-bending and validates findings with pad bending. Results show: (1) Two-step bending reduces maximum strain; (2) Larger first-step radius disperses strain; (3) Smaller first-step angle introduces compressive strain, further reducing strain; (4) In pad bending, strain varies with distance to the bend apex, influenced by first-step parameters.