Towards virtual deformation dilatometry for the design of hot stamping process
Towards virtual deformation dilatometry for the design of hot stamping process
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用于热冲压工艺设计的虚拟变形膨胀法
DOI：
10.1016/j.proeng.2017.10.945
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
Merklein
中科院分区：
文献类型：
--
作者：
Bambach;Hart-Rawung;Lechner;Merklein
热冲压是生产具有优异强度重量比的结构汽车部件的成熟工艺。热冲压过程中热机械过程的复杂性要求对热冲压工艺进行精确的虚拟设计。对最常用的22 MnB 5钢的热性能和力学性能进行了全面的研究，并建立了数值模型。对于涉及定制回火的新的钢成分和部件，需要在变形温度计或热机械模拟器上测量微观结构演变和所得性能。如果有合适的材料模型，新的钢成分和热-机械历史可以部分地通过模拟变形试验来探索。本文介绍了热冲压钢22 MnB 5的实验和虚拟变形速率仪测试的比较。基于材料模型 * MAT 248，在软件LS-Dyna中以有限元模型的形式实现虚拟应变计。在此模型下，虚拟和真实的应变计曲线仅在马氏体完全硬化的条件下对应良好，而预应变导致模型和实验之间的较大差异。当最敏感的模型参数被制定为预应变的函数时，所有的实验应变计曲线都可以由该模型再现。这种数据驱动的模型扩展似乎是有效的创建一个高精度的虚拟万用表模型。
Hot stamping is a well-established process for the production of structural automotive parts with an excellent strength-to-weight ratio. The complexity of the thermo-mechanical history in hot stamping requires a precise virtual design of hot stamping processes. The thermal and mechanical characteristics of the most common press hardening steel 22MnB5 were investigated comprehensively and are well represented by numerical models. For new steel compositions and parts involving tailored tempering, numerous experiments, e.g., on a deformation dilatometer or thermo-mechanical simulator are needed to characterise the microstructure evolution and the resulting properties. If appropriate material models were available, new steel compositions and thermo-mechanical histories could be partly explored virtually by simulated deformation dilatometer tests. This paper presents a comparison of experimental and virtual deformation dilatometer tests for the hot stamping steel 22MnB5. The virtual dilatometer is implemented as finite element model in the software LS-Dyna based on the material model *MAT248. With this model, virtual and real dilatometer curves correspond well only for conditions of full martensitic hardening, while pre-strains cause larger differences between model and experiments. When the most sensitive model parameters are formulated as a function of pre-strain, all experimental dilatometer curves can be reproduced by the model. Such a data-driven extension of the model seems to be effective for creating a virtual dilatometer model of high accuracy.
通过相场法计算的 3D 多相结构的虚拟膨胀计曲线和有效杨氏模量
影响因子：
3.3
作者：
M. Apel;S. Benke;I. Steinbach
通讯作者：
I. Steinbach
单分散铋纳米颗粒装饰石墨氮化碳：增强可见光响应光催化NO去除和反应途径
影响因子：
22.1
作者：
Jiang, Guangming;Li, Xinwei;Zhang, Sen
通讯作者：
Zhang, Sen