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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, the fatigue crack propagation behavior and fatigue failure of a new type of structural glass fiber reinforced glass-aluminum hybrid laminates (GLALL) under different external loads were investigated. It is found that the fatigue crack propagation rate of GLALL is much lower than that of a single Al alloy due to the decrease of the effective stress field strength factor at the crack tip due to the bridging effect of the unbroken high strength fiber on the crack. With the extension of the fatigue cracks in the Al alloy layer, delamination damage occurs in the vicinity of the GLALL fatigue crack, and the width of the delamination zone increases with the increase of the applied load. The smaller the width of the delaminated zone, the stronger the bridging effect of the fibers on the fatigue crack.