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首页> 外文会议>Asia steel international conference >Fracture Mechanical Study on Stretch Flange-Ability of Hot-Rolled High Tensile Strength Steel Sheets
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Fracture Mechanical Study on Stretch Flange-Ability of Hot-Rolled High Tensile Strength Steel Sheets

机译：热轧高拉伸强度钢板拉伸法兰能力的折断力学研究

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In order to clarify the governing factors of stretch flange-ability,a study to elucidate the mechanism of crack growth on pierced edges during hole expanding tests was carried out and the following conclusions were obtained.1) In the beginning and the middle stage of crack growth,cracks on the pierced edge grow through its thin surface where a large strain has been introduced by piercing.In the following final stage one of them grows rapidly into deeper area where the material is not or only slightly strained by piercing.Hole expansion ratio is characterized by the final rapid crack growth.2) In the beginning and the middle stage of hole expansion,crack initiation and growth occur faster in the steel sheets with higher stretch flange-ability.But crack growth into deeper area is retarded in these steel sheets,and it gives superior stretch flange-ability to these steel sheets.3) Materials with good stretch flange-ability have strong crack growth resistance which can be measured by the test method based on fracture mechanics.This is due to the fact that stretch flange-ability is characterized by the final rapid growth of edge cracks and its occurrence is basically dependent on the crack growth resistance based on fracture mechanics.
机译：为了澄清拉伸法兰能力的治疗因素，进行阐明孔扩张试验期间刺穿边缘裂纹生长机制的研究，并获得了以下结论.1）在裂缝的开始和中期阶段刺穿边缘的裂缝通过其薄表面而生长，其中通过穿孔引入大菌株。在以下最后阶段之后，其中一个迅速生长到更深的区域，其中材料不是通过穿孔稍微紧张的深层区域。霍尔膨胀比其特征在于最终的快速裂纹增长.2）在孔膨胀的开始和中间阶段，钢板裂纹引发和生长具有较高的拉伸法兰能力的速度。但在这些钢中延迟了裂纹增长进入更深的区域。床单，它为这些钢板提供了卓越的拉伸法兰能力.3）具有良好的拉伸法兰能力的材料具有强烈的裂纹生长阻力，可以通过TE测量基于骨折力学的ST方法。这是由于延伸法兰能力的特征在于边缘裂缝的最终快速生长，其发生基本上取决于基于骨折力学的裂纹生长抗性。

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