作　　者： ; ; ; ;

机构地区： 南京航空航天大学能源与动力学院

出　　处： 《航空动力学报》 2004年第6期749-754,共6页

摘　　要： 采用宏—细观统一的弹塑性本构模型分析了多轴载荷作用下不同纤维形状、不同纤维排列方式对金属基复合材料初始屈服面的影响。研究表明:在纵向正应力作用下,圆截面纤维复合材料的初始屈服应力基本上与方形截面纤维复合材料的初始屈服应力相等;不同纤维排列方式的复合材料初始屈服应力基本上相同。当存在横向应力或纵横剪切应力时,圆截面纤维复合材料初始屈服面在方形截面纤维复合材料初始屈服面之内;六角形排列时最容易屈服,而方形对角排列屈服应力最高。 The unified macro and micro mechanics constitutive model was used to investigate the influence of microstructural geometry, such as fiber shape and fiber packing array, on the composite initial yielding surfaces under multi-axial loading. Under longitudinal stress, composites reinforced by fibers with square cross section have the same yielding stress as the ones reinforced by fibers with cyclic cross section. Fiber packing array has no effect on the yielding stress. In the presence of transverse or shear stress, the composite initial yielding surface with square cross section fibers is inside of the one of composite with square cross section fibers. Composite with hexagon fiber array has the lowest yielding stress; however, composite with square-diagonal fiber array has the highest.

关 键 词： 航空 航天推进系统 金属基复合材料 宏 细观本构模型 屈服面

领　　域： [一般工业技术] [航空宇航科学与技术] [航空宇航科学技术]