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In order to improve the simulation prediction accuracy of failure behavior of AHSS in vehicle crash, this paper studied the principle of 6 typical failure models such as GISSMO in mainstream LS-DYNA solver, it also studied the calibration methods of material fracture limit strain and mesh size regularization, the most crucial parameters affecting the failure behavior prediction accuracy of ultra-high strength steel during vehicle crash simulation. During the calibration process of fracture limit strain, average stress triaxiality should be used in order to describe the non-linearity loading paths. To overcome the limitations of default mesh size regularization method, the paper proposed a customized mesh size regularization method, which can effectively improve the consistency of simulation results for different mesh size models under typical stress states.
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为了提高超高强钢材料在整车碰撞过程中的失效行为仿真预测精度,对比分析了主流求解器LS_DYNA中GISSMO等6种典型失效模型的原理,并针对GISSMO失效模型中影响整车碰撞失效仿真精度最为关键的参数材料断裂极限应变及网格尺寸修正特性设置方法进行了研究。断裂极限应变标定过程中应变路径存在非线性,需要采用加载历程平均应力三轴度来进行描述;默认的网格修正设置方法难以兼顾不同应力状态,采用自定义的网格尺寸修正设置方法可以有效提高典型应力状态下不同网格尺寸模型仿真预测结果的一致性。
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张骥超(1988—),男,高级工程师,硕士学位,研究方向为超高强钢材料使用技术、轻量化应用及结构性能评价。
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1 Research Institute, Baoshan Iron & Steel Co., Ltd., Shanghai 201900
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1 宝山钢铁股份有限公司研究院,上海 2019002
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张骥超(1988—),男,高级工程师,硕士学位,研究方向为超高强钢材料使用技术、轻量化应用及结构性能评价。
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张骥超(1988—),男,高级工程师,硕士学位,研究方向为超高强钢材料使用技术、轻量化应用及结构性能评价。
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24 (6): 1071-96., articleTitle=A New Model of Metal Plasticity and Fracture with Pressure and Lode Dependence, refAbstract=null)], funds=null, companyList=[AuthorCompany(id=1217498889347842988, tenantId=1146029695717560320, journalId=1189873562199433220, articleId=1217470735728169633, xref=1, ext=[AuthorCompanyExt(id=1217498889356231597, tenantId=1146029695717560320, journalId=1189873562199433220, articleId=1217470735728169633, companyId=1217498889347842988, language=EN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=
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模型 特性 | 断裂极限准则 | 网格尺寸修正 | 应变率修正 | 损伤 累积 | 损伤 耦合 |
| MAT024 | 固定值 | 无 | 无 | 无 | 无 |
| MAT123 | 简单 | 无 | 无 | 无 | 无 |
| MAT015 | 简单 | 无 | 有 | 线性 | 无 |
| MAT224 | 自定义 | 有 | 有 | 线性 | 无 |
| MAT081 | 固定值 | 无 | 无 | 无 | 线性 |
| GISSMO | 自定义 | 有 | 有 | 非线性 | 非线性 |
), ArticleFig(id=1217498893420511325, tenantId=1146029695717560320, journalId=1189873562199433220, articleId=1217470735728169633, language=CN, label=表1, caption=
LS-DYNA各向同性失效模型特性
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模型 特性 | 断裂极限准则 | 网格尺寸修正 | 应变率修正 | 损伤 累积 | 损伤 耦合 |
| MAT024 | 固定值 | 无 | 无 | 无 | 无 |
| MAT123 | 简单 | 无 | 无 | 无 | 无 |
| MAT015 | 简单 | 无 | 有 | 线性 | 无 |
| MAT224 | 自定义 | 有 | 有 | 线性 | 无 |
| MAT081 | 固定值 | 无 | 无 | 无 | 线性 |
| GISSMO | 自定义 | 有 | 有 | 非线性 | 非线性 |
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