摘要
本文研究了一种新型结构复合材料玻璃纤维-Al 混杂复合层板(Glass Aluminum Laminates,GLALL)在不同外载荷作用下的疲劳裂缝扩展行为,以及疲劳破坏规律。试验发现,由于未断高强度纤维对裂缝的桥接作用降低了裂缝尖端的有效应力场强度因子,GLALL 的疲劳裂缝扩展速率远低于单一Al 合金。伴随 Al 合金层内疲劳裂缝的扩展,GLALL 疲劳裂缝附近区域会产生脱层破坏,脱层区宽度随外加载荷增大而增大。脱层区宽度越小,纤维对疲劳裂缝的桥接作用越强。
In this paper,fatigue crack growth behavior and the delamination phenome-non under different stress levels of a new kind of hybrid composite-glass fiber reinforce alumi-num laminates(GLALL)have been investigated.It is found that fatigue crack growth rate ofGLALL laminates is much lower than that of monolithic aluminum sheet,and this is due to thepresence of unbroken high strength glass fibers on the crack,which acts as bridge and lowers theeffective stress intensity factor on the crack tip.It is also found that with the fatigue crackgrowth in aluminum layer,the near crack area delaminates,the width of the delamination areaincreases with the increasing of applied stress.The effect of fibers on the fatigue crack is moreprominent when the delamination area is small.
基金
国家自然科学基金
59071006
