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metal matrix composites
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  metal matrix composites
On the hot working characteristics of 2124 Al-SiCp metal matrix composites
      
Size effect in particulate metal matrix composites: An analytical approach
      
This study briefly reviews various existing methods to account for the effect of particle size on the mechanical properties of particulate metal matrix composites.
      
The strain hardenings in metal matrix composites are increased with smaller particles and larger volume fractions which could not be predicted with size-independent constitutive relation.
      
The fibre push-out test has been extensively used to measure the fibre-matrix interfacial properties in polymer, ceramic and metal matrix composites.
      
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This paper proposes a modified shear lag model accounting for the effect of the tensile stiffness of the matrix, which can be used for studying the stress redistribution due to the failure of fibers or matrix of unidirectionally fiber reinforced composites, discusses quantitatively the influence of the stiffness ratio of matrix to fiber and of the fiber volume fraction on the stress concetrations in the fibers and matrix adjacent to the fracture and proves that the influence of the tensile stiffness of the...

This paper proposes a modified shear lag model accounting for the effect of the tensile stiffness of the matrix, which can be used for studying the stress redistribution due to the failure of fibers or matrix of unidirectionally fiber reinforced composites, discusses quantitatively the influence of the stiffness ratio of matrix to fiber and of the fiber volume fraction on the stress concetrations in the fibers and matrix adjacent to the fracture and proves that the influence of the tensile stiffness of the matrix on the stress concentration can be neglected when the matrix stiffness is low (such as polymer matrix composites) and the volume fraction of fibers is high. For the other cases, such as ceramic and metal matrix composites, the tensile stiffness of the matrix can not be neglected in the shear lag analysis.

提出了一种计及基体拉伸刚度效应的修正剪滞模型,用于研究单向纤维增强复合材料中由于纤维或基体破坏所引起的应力重分布问题。文中定量讨论了纤维/基体拉伸刚度比及纤维体积分数对断口邻近的纤维和基体的应力集中的影响。证实了当基体拉伸模量较低(如树脂基复合材料)及纤维体积分数较大时,可以忽略基体刚度对应力集中的影响;而对于其它情形(如陶瓷、金属基复合材料),就不可忽略基体刚度的影响。

Residual thermostrain is an important factor which affects the behaviour of metal matrix composites. In this paper, the equivalent inclusion theory is employed to investigate the influence of the residual thermostrain on the tension and compression behaviours of metal matrix composites quantitatively. Through the experiments about the tension and compression behaviours of 20% SiC w/Al and the observation to the fracture microcharacters, it is implied that the theoretical model in this paper reflects...

Residual thermostrain is an important factor which affects the behaviour of metal matrix composites. In this paper, the equivalent inclusion theory is employed to investigate the influence of the residual thermostrain on the tension and compression behaviours of metal matrix composites quantitatively. Through the experiments about the tension and compression behaviours of 20% SiC w/Al and the observation to the fracture microcharacters, it is implied that the theoretical model in this paper reflects the plastic principle of whisker reinforced metal matrix composites and the necesserity of considering residual thermostrain is confirmed. The theoretical model provides a method to estimate matrerial behaviours and optimal design.

热残余应变是影响晶须增强金属基复合材料的重要因素。本文利用作者改进的等效夹杂理论定量研究了热残余应变对金属基复合材料塑性强化规律的影响,并对20%SiCw/Al材料的拉、压断口做了SEM观察,通过其拉、压性能实验验证了本文理论的合理性,说明了考虑热残余应变的必要性。

A computational micro mechanics approach is adopted here to investigate the tensile strength of metal matrix composites(MMC) with both interface and matrix damage. A phenomenological cohesive zone model is employed to simulate the damage along the fiber/matrix interface. The damage in matrix, characterized by void nucleation, growth, and coalescence, is described by the Gurson Tvergaard material model. These damage models are applied to a boundary value problem that involves a double...

A computational micro mechanics approach is adopted here to investigate the tensile strength of metal matrix composites(MMC) with both interface and matrix damage. A phenomenological cohesive zone model is employed to simulate the damage along the fiber/matrix interface. The damage in matrix, characterized by void nucleation, growth, and coalescence, is described by the Gurson Tvergaard material model. These damage models are applied to a boundary value problem that involves a double periodic array of elastic continuous fibers in an elastic plastic matrix subjected to the transverse loads. The influence of the interface properties on the tensile strength and the damage evolutions of MMC is discussed in detail.

用细观计算力学的方法分析了金属基复合材料 (MMC)多重损伤与强度的关系 ,采用唯象的内聚力模型模拟纤维 /基体界面的脱粘和采用G T模型描述韧性基体的损伤 .并用上述模型分析了长纤维增强MMC在横向荷载作用下损伤演化的规律 ,讨论了不同界面性质与材料强度及损伤、破坏模式之间的关系

 
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