短纤维增强金属基复合材料的多重损伤分析  

MULTIPLE DAMAGE ANALYSIS OF SHORT FIBER REINFORCED METAL MATRIX COMPOSITES

作　　者：周储伟[1] 王鑫伟[1] 杨卫[2] 方岱宁[2] 

机构地区：[1]南京航空航天大学飞行器系,南京210016 [2]清华大学工程力学系,北京100084

出　　处：《复合材料学报》2001年第4期64-67,共4页Acta Materiae Compositae Sinica

基　　金：中国博士后基金 ;江苏省博士后基金资助

摘　　要：用细观计算力学的方法分析了短纤维增强金属基复合材料 (MMC)多重损伤的相互作用及对拉伸强度的影响。采用唯象的内聚力模型模拟界面的脱粘 ;G- T模型描述延性基体的损伤。在胞元模型的基础上研究了界面强度、纤维长径比等细观参数对材料损伤模式及强韧性的影响。研究表明 ,界面较弱时 ,损伤以界面脱粘为主 ,界面的强度决定了材料强度 ;当界面较强时 ,晶须将发生断裂 ,材料的最终强度由晶须的强度决定。Mechanical properties and the damage evolutions of short fiber reinforced metal matrix composites (MMC) were studied by a meso mechanics model numerically. A phenomenological cohesive interface was formulated to simulate the fiber/matrix interface damage while the Gurson Tvergaard model was adopted to describe the matrix damage. Attention was focused on the effects of the meso parameters on the damage, strength and toughness of the MMC. The meso parameters considered here include interface strength and fiber's aspectratio. All the computations were made based on the cell model. The investigation revealed that, if the interface is weak, the interface debonding is the main reason causing the MMC's loading capacity decreasing; when the interface strength is strong enough, the fiber tends to break and the ultimate strength of MMC is dominated by the fiber's strength. The dependence of the distribution of the matrix damage on the interface strength was also depicted in this study.

关 键 词：金属基复合材料 细观力学 损伤 内聚力模型 G-T模型 短纤维 

分 类 号：TB333[一般工业技术—材料科学与工程]