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A Three-Dimensional Multi-scale Plasticity Model for Metal-Intermetallic Laminate Composites Containing Phases of the L12 Structure
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作者 Yana D.Lipatnikova Vladimir A.Starenchenko +1 位作者 Yuliya V.Solov'eva Larisa A.Valuiskaya 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2018年第12期1265-1271,共7页
A three-dimensional plasticity model was developed and applied to metal-intermetallic laminate composites containingphases of the L12 structure. A multi-scale approach that combined the methods of continuum mechanics ... A three-dimensional plasticity model was developed and applied to metal-intermetallic laminate composites containingphases of the L12 structure. A multi-scale approach that combined the methods of continuum mechanics and dislocationkinetics was used. This model takes account of the different mechanisms of self-locking superdislocations, the dislocationsand the dislocation walls' density storage for each type of layer at the micro-scale. At the meso-scale, the solutions to thedislocation kinetics equations, in the form of stress-strain curves, were used to create the properties of a three-dimensionalrepresentative element. The numerical simulation study of the macroscopic deformation was carried out with the finiteelement method using the dynamic model of continuum mechanics, which included the classical conservation laws,constitutive equations and the equation of state. It was shown that the simulation results generated using this model were ingood agreement with the mechanical tests conducted on the single crystals of the L12 structure. The model provides anexcellent description of the high-temperature plastic strain superlocalization effect of single crystal intermetallics of theLI2 structure. This paper describes the numerical results of the study of the tension and compression tests of metal-intermetallic laminate composites containing phases of the L12 structure. The model allows the description of the dis-tribution of the accumulated plastic strain inhomogeneities and is capable of predicting the strengthening properties andplastic behaviour of the metal-intermetallic laminate composites containing phases of the L12 structure. 展开更多
关键词 Plasticity model metal-intermetallic laminate composites Layered composites L12 structure Tension Compression
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基于SPH-FEM法Ti/Al_3Ti装甲防护性能研究 被引量:5
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作者 韩肖肖 张学义 +3 位作者 周培俊 果春焕 曹阳 姜风春 《兵器材料科学与工程》 CAS CSCD 北大核心 2017年第1期66-72,共7页
为研究Ti/Al_3Ti层状复合材料靶板在不同撞击时刻的损伤情况及失效形式,通过SPH-FEM模拟钨合金弹侵彻Ti/Al_3Ti层状复合材料靶板的过程,探讨其防护性能。模拟结果表明:在高速冲击载荷作用下靶板产生花瓣形开裂,伴随有不同程度的剥离;Al_... 为研究Ti/Al_3Ti层状复合材料靶板在不同撞击时刻的损伤情况及失效形式,通过SPH-FEM模拟钨合金弹侵彻Ti/Al_3Ti层状复合材料靶板的过程,探讨其防护性能。模拟结果表明:在高速冲击载荷作用下靶板产生花瓣形开裂,伴随有不同程度的剥离;Al_3Ti层中出现径向沟槽状损伤裂纹,并出现部分脱落现象。Ti/Al_3Ti特殊的叠层结构使层间裂纹不断改变其扩展方向,发生裂纹偏转,增加裂纹扩展路径,使材料吸收更多的冲击能量,从而具有良好的装甲防护性能。 展开更多
关键词 金属间化合物基层状复合材料 SPH-FEM方法 侵彻损伤 装甲防护性能
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Ti/Al3Ti层状复合材料层间断裂性能研究 被引量:4
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作者 王泽明 周培俊 +3 位作者 汪恩浩 袁丁 姜风春 果春焕 《中国材料进展》 CAS CSCD 北大核心 2017年第2期155-160,共6页
金属间化合物基层状复合材料Ti/Al_3Ti是采用Ti-6Al-4V箔和Al箔按照一定顺序叠加后,在真空环境下热压烧结成由韧性金属Ti和金属间化合物Al_3Ti组成的叠层结构。利用ENF(End-Notch-Flexure)和MMF(Mixed-Mode-Flexure)测试方法,对Ti/Al_3T... 金属间化合物基层状复合材料Ti/Al_3Ti是采用Ti-6Al-4V箔和Al箔按照一定顺序叠加后,在真空环境下热压烧结成由韧性金属Ti和金属间化合物Al_3Ti组成的叠层结构。利用ENF(End-Notch-Flexure)和MMF(Mixed-Mode-Flexure)测试方法,对Ti/Al_3Ti层状复合材料的Ⅱ型及Ⅰ+Ⅱ型层间断裂能、层间断裂行为以及能量释放率等方面进行了研究。结果表明,Ti/Al_3Ti层间断裂时,裂纹在复合材料界面处发生起裂,而在传播过程中发生偏转,最终导致Al_3Ti层开裂。由此可见,在实验过程中裂纹的表现形式是在Ti/Al_3Ti界面及Al_3Ti层中共同扩展;Ⅰ+Ⅱ型层间起裂能量释放率G_(Ⅰ+Ⅱ)为46 J/m^2,Ⅱ型层间起裂能量释放率G_Ⅱ为1453 J/m^2,表明Ⅱ型层间断裂比Ⅰ+Ⅱ型层间断裂更困难。 展开更多
关键词 层状复合材料Ti/Al3Ti I+II型层间断裂 II型层间断裂 层间断裂研究 层间能量释放率
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