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基于连续体损伤理论的硼钢高温成形极限确定法

唐炳涛

唐炳涛. 基于连续体损伤理论的硼钢高温成形极限确定法[J]. 力学学报, 2016, 48(1): 146-153. doi: 10.6052/0459-1879-15-314
引用本文: 唐炳涛. 基于连续体损伤理论的硼钢高温成形极限确定法[J]. 力学学报, 2016, 48(1): 146-153. doi: 10.6052/0459-1879-15-314
Tang Bingtao. PREDICTION OF FORMING LIMIT OF BORON STEEL AT ELEVATED TEMPERATRUE BASED ON CDM THEORY[J]. Chinese Journal of Theoretical and Applied Mechanics, 2016, 48(1): 146-153. doi: 10.6052/0459-1879-15-314
Citation: Tang Bingtao. PREDICTION OF FORMING LIMIT OF BORON STEEL AT ELEVATED TEMPERATRUE BASED ON CDM THEORY[J]. Chinese Journal of Theoretical and Applied Mechanics, 2016, 48(1): 146-153. doi: 10.6052/0459-1879-15-314

基于连续体损伤理论的硼钢高温成形极限确定法

doi: 10.6052/0459-1879-15-314
基金项目: 国家自然科学基金(51375280),教育部“新世纪优秀人才支持计划”(NCET-12-1028),山东省自然科学基金重点项目(ZR2013EEZ003)和山东省重点研发计划(2015GGX103029)资助项目.
详细信息
    通讯作者:

    唐炳涛,副教授,主要研究方向:塑性加工中的力学问题.E-mail:tangbingtao@sdjzu.edu.cn

  • 中图分类号: TG3

PREDICTION OF FORMING LIMIT OF BORON STEEL AT ELEVATED TEMPERATRUE BASED ON CDM THEORY

  • 摘要: 为了应对节能减排及汽车安全性的双重要求,先进高强钢的开发和应用受到愈来愈高的重视. 超高强度钢板热冲压成形技术是减轻车身重量、提高汽车抗冲击和防撞性能的重要途径,目前已经成为世界汽车制造行业的热门技术. 成形极限是硼钢热冲压成形过程中一个非常重要的表征参数,但由于高温半球形凸模胀形试验(Nakazima) 的复杂性造成实验测试面临诸多困难. 针对硼钢热冲压成形过程特点,提出将韧性损伤模型与有限元数值模拟技术结合起来预测硼钢高温成形极限的方法. 在连续体损伤力学基础上,建立了考虑有效应力和等效塑性应变对微孔损伤影响的勒迈特(Lemaitre) 韧性损伤演化方程,在损伤耗散势函数中引入了等效塑性应变因子,从而寻找到能够准确反映硼钢在奥氏体状态下的成形特性的勒迈特耗散势函数. 选取基于遗传算法的基于非支配排序的多目标优化算法(NSGA-II) 与有限元分析软件“FORGETM” 相结合的方法优化韧性损伤模型中材料的损伤因子,并利用优化后的损伤因子准确预测到板料成形过程的拉伸失稳和断裂现象. 将建立的韧性损伤模型引入到硼钢高温半球形凸模胀形有限元仿真模型中,通过预测的成形极限与实验测定结果的比较,验证了所提韧性损伤模型预测硼钢高温成形极限的可靠性.

     

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出版历程
  • 收稿日期:  2015-08-17
  • 修回日期:  2015-09-28
  • 刊出日期:  2016-01-18

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