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The Effect of 3D Representative Volume Element Grain Morphology Resolution on the Prediction of Fracture and Damage Accumulation for Multiphase Hot‐Stamped Steels
Steel Research International ( IF 1.9 ) Pub Date : 2021-02-13 , DOI: 10.1002/srin.202000536 Alexander Bardelcik 1 , Arshdeepsingh Sardar 1 , Caryn J. Vowles 1
Steel Research International ( IF 1.9 ) Pub Date : 2021-02-13 , DOI: 10.1002/srin.202000536 Alexander Bardelcik 1 , Arshdeepsingh Sardar 1 , Caryn J. Vowles 1
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This work investigates the effect of 3D representative volume element (RVE) grain morphology resolution on the prediction of fracture and damage evolution for tailor hot stamped steels. Scanning electron micrographs were used to build RVE meshes from coarse‐8 × 8 (<1 elements μm−3) to high‐50 × 50 (53–81 elements μm−3) element densities. For a uniaxial stress‐state, the tailored material condition (TMC1) (ferrite‐pearlite‐martensite) RVE nucleated voids due to separation between small martensite grains and the RVE fracture strain was 0.41 and 0.53 for the 50 × 50 and 25 × 25 RVE, respectively. The TMC3 (ferrite‐bainite‐martensite) RVE predicted high strain partitioning between the irregularly shaped martensite grains and the higher resolution RVE predicts a 39% lower fracture strain. The large grained martensite‐bainite TMC5 RVE predicted relatively similar void accumulation and strain partitioning behavior for the 50 × 50 and 25 × 25 RVE models, while the coarser 13 × 13 and 8 × 8 models predicted higher fracture strains due to low grain morphology resolution. Compared to an experimentally derived fracture locus, plane strain and equibiaxial deformation of the RVEs was shown to predict the equivalent fracture strains reasonably well, but like in the uniaxial case, the coarser RVEs overpredict the fracture strain.
中文翻译：
3D代表体积元素晶粒形态分辨率对多相热冲压钢断裂和损伤累积预测的影响
这项工作研究了3D代表体积元素（RVE）晶粒形态分辨率对定制热冲压钢的断裂和损伤演变的预测的影响。扫描电子显微照片被用来建立RVE网格从粗8×8（<1个微米元素-3）到高50×50（53-81微米的元件-3）元素密度。对于单轴应力状态，由于50×50和25×25 RVE的小马氏体晶粒与RVE断裂应变之间的分离，定制材料条件（TMC1）（铁素体-珠光体-马氏体）的RVE有核空隙为0.41和0.53 ， 分别。TMC3（铁素体-贝氏体-马氏体）RVE预测不规则形状的马氏体晶粒之间的高应变分配，而较高分辨率的RVE则预测断裂应变低39％。大晶粒马氏体-贝氏体TMC5 RVE预测50×50和25×25 RVE模型的空隙累积和应变分配行为相对相似，而较粗的13×13和8×8模型则由于较低的晶粒形态分辨率而预测较高的断裂应变。与实验得出的骨折点相比，
更新日期：2021-02-13
中文翻译：
3D代表体积元素晶粒形态分辨率对多相热冲压钢断裂和损伤累积预测的影响
这项工作研究了3D代表体积元素（RVE）晶粒形态分辨率对定制热冲压钢的断裂和损伤演变的预测的影响。扫描电子显微照片被用来建立RVE网格从粗8×8（<1个微米元素-3）到高50×50（53-81微米的元件-3）元素密度。对于单轴应力状态，由于50×50和25×25 RVE的小马氏体晶粒与RVE断裂应变之间的分离，定制材料条件（TMC1）（铁素体-珠光体-马氏体）的RVE有核空隙为0.41和0.53 ， 分别。TMC3（铁素体-贝氏体-马氏体）RVE预测不规则形状的马氏体晶粒之间的高应变分配，而较高分辨率的RVE则预测断裂应变低39％。大晶粒马氏体-贝氏体TMC5 RVE预测50×50和25×25 RVE模型的空隙累积和应变分配行为相对相似，而较粗的13×13和8×8模型则由于较低的晶粒形态分辨率而预测较高的断裂应变。与实验得出的骨折点相比，
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