The ductile performance of high strength steel (HSS) from different steel grades, producers, manufacturing processes varies a lot. It is also difficult to conduct all kinds of reliable experiments to generate different stress status through different initial specimen geometries or by applying different load combinations in the civil engineering sector. One of the common issues for HSS structures is to identify the parameters of the ductile fracture model conveniently from the uniaxial stress–strain relationship obtained from common coupon specimens. An attempt is made in this paper to use the proposed mesoscale critical equivalent plastic strain (MCEPS) to calibrate the fracture locus of the uncoupled phenomenological model based only on the engineering stress–strain relationship. The proposed method is successfully validated by the Sandia fracture challenge in 2014.

中文翻译：

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用中尺度临界当量塑性应变识别延性断裂轨迹

不同等级，生产商，制造工艺的高强度钢（HSS）的延展性能差异很大。进行各种可靠的实验以通过不同的初始试样几何形状或通过在土木工程领域中施加不同的载荷组合来产生不同的应力状态也是困难的。HSS结构的常见问题之一是根据从普通试样获得的单轴应力-应变关系方便地识别韧性断裂模型的参数。本文尝试仅根据工程应力-应变关系，使用拟定的中尺度临界当量塑性应变（MCEPS）来校正非耦合现象学模型的断裂轨迹。