结构钢中绝热剪切带形成与扩展的光学观测与数值模拟
Optical Observation and Numerical Simulation on the Evolution of Adiabatic Shear Band in Structural Steel
查看参考文献9篇
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文摘
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绝热剪切带(Adiabatic Shear Band,ASB)是许多金属材料在冲击载荷作用下发生破坏的主要原因之一,它是近年来冲击动力学和损伤力学研究的前沿和热点.相关的理论研究主要针对一维剪切条件,分析应力、应变、剪切速度、材料热物理和力学性能、初始缺陷大小之间的关系,得到一个由多个物理量组合而成的量来判别材料出现剪切带的难易.ASB的实验主要利用Hopkinson压杆、扭杆、压剪炮等加载技术,研究钛合金、钨合金、高强结构钢等材料的剪切带特征,包括局部温度和变形分布、剪切带出现的阈值等.但是,对剪切带演化过程的在位观察及其动态实时演化的研究还较少见,妨碍了人们对由于剪切局部化而导致的材料破坏机理的深入认识.针对45钢,在Hopkinson压杆上,开展了不同冲击加载条件下剪切带演化过程的在位观察及可视化研究.利用自行设计的高分辨力的光学观测系统和基于数字相关理论的图像处理软件,捕捉了单一试样在冲击加载条件下ASB逐渐形成和扩展的过程.同时,利用LS-DYNA商业程序对试样的冲击压缩过程进行了数值模拟,所得主要结果与实验观测基本一致. |
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其他语种文摘
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Adiabatic shear band (ASB) may cause damages and failures of many metal material s under
impact loading ,which is a key issue in the research of damage mechanism. The theoretical study is
mainly focused on the relationship among t he st rain , st ress , speed of shear and t he initial flaw size in
one2dimension shear conditions ,which is used to determine t he possibility of t he generation of ASB. By
experimental investigations , t he features of ASB of titanium alloy , t ungsten alloy and high2st rength
st ruct ural steel ,including deformation fields ,local temperat ure and t he threshold value for ASB gener2
ating ,can be detected. However ,since t here is lit tle st udy on t he real2time and i n2si t u measurement s on
the evolution process of ASB ,t he failure detail s according to t he shear2localization are still unknown.
In this paper ,t he real2time observations and visualizations on t he evaluation of ASB in 45 steel under
different impact conditions in SHPB are presented. The generating and evaluating processes in a single
sample are detected and analyzed by a self2design optical system and t he self2designed sof tware ,which
is based on Digital Correlation met hod wit h high resolution. At t he same time ,t he numerical simula2
tions and micro2observations by SEM are obtained by LS2DYNA and t he simulation result s are in good
agreement wit h t he experimental ones. |
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来源
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高压物理学报
,2010,24(1):31-36 【核心库】
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关键词
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数值模拟
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分离式霍普金森压杆(SHPB)
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绝热剪切带
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可视化
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地址
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1.
北京理工大学光电成像与信息工程研究所, 北京, 100081
2.
中国科学院力学研究所, 北京, 100190
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1000-5773 |
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学科
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力学 |
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基金
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国家973计划
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文献收藏号
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CSCD:3871045
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