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首页> 外文期刊>Materials Science and Engineering. A, Structural Materials >Damage accumulation and failure of HSLA-100 steel
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Damage accumulation and failure of HSLA-100 steel

机译：HSLA-100钢的损伤累积和失效

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摘要

Damage accumulation in the form of the volume fractions and number densities of strain-induced voids has been experimentally characterized for HSLA-100 steel subjected to tensile failure over a range of stress-states (stress triaxiality ratios of 0.8 to 1.4). The dependence of void volume fraction on strain indicates the presence of a void growth stage that is sensitive to stress-state in a manner that can be described by a relationship with the form that can be predicted by Rice and Tracey but with an increased dependence on stress triaxiality. The damage results also suggest a transition of stable void growth to rapid void growth and imminent material fracture at a critical void volume fraction that decreases slowly with increasing stress triaxiality ratio. A straight-forward analysis, based on the experimental observations, relates the observed experimental dependence of failure strains on stress triaxiality for this steel. The damage accumulation behavior of this steel, which fails due to the growth and coalescence of equiaxed voids, is also contrasted to that of HY-100 steel which forms elongated voids.
机译：对于在应力状态范围（应力三轴比为0.8到1.4）范围内遭受拉伸破坏的HSLA-100钢，已经通过实验表征了应变诱发空隙的体积分数和数量密度形式的损伤累积。空隙体积分数对应变的依赖性表明存在空隙生长阶段，该空隙生长阶段对应力状态敏感，其方式可通过与莱斯和特蕾西可以预测的形式的关系来描述，但对空隙的依赖性增加。应力三轴性。损伤结果还表明，在临界空隙体积分数处，稳定的空隙生长过渡到快速的空隙生长，并且即将发生的材料断裂随着应力三轴比的增加而逐渐减小。基于实验观察的直接分析，将观察到的这种钢的破坏应变与应力三轴性的实验相关性联系起来。这种钢的损伤累积行为由于等轴空洞的生长和聚结而失效，也与形成细长空洞的HY-100钢相反。

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