Characterizing the off-axis dependence of failure mechanism in notched fiber metal laminates
Characterizing the off-axis dependence of failure mechanism in notched fiber metal laminates
复制标题
表征缺口纤维金属层压板失效机制的离轴依赖性
DOI：
10.1016/j.compstruct.2017.11.016
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发表时间：
2018-02
影响因子：
6.3
通讯作者：
赵元
中科院分区：
文献类型：
--
作者：
张继鹏;王玥;张嘉振;周振功;方国栋;赵元
纤维金属层合板（FML）的破坏形式通常比其组成材料更为复杂，尤其是在复杂载荷作用下。在本文中，缺口FML和成分，即，对铝和玻璃纤维增强塑料（GFRP）进行离轴拉伸载荷以评估破坏机制。最初的注意力放在离轴依赖的机械响应，特别是其关系的缺口尺寸。正如预期的那样，缺口强度和缺口敏感性的离轴依赖性与缺口尺寸密切相关，但不同的GFRP层合板和FML由于其不同的损伤行为。有限元模型可以准确地预测FML的力学响应，特别是阐明其损伤机理。在偏轴载荷作用下，带缺口的FML的破坏是横向断裂和剪切破坏的综合，而带缺口的GFRP层合板的破坏是剪切破坏为主。铝合金首先发生横向断裂，然后发生纤维断裂，而纤维断裂被大范围的亚临界损伤所推迟。此后，下降部分的纤维层和铝层瞬间发生剪切破坏。因此，离轴缺口FML的临界失效仍然是在轴上的情况下，张力为主，但铝发挥了关键作用。
Fiber metal laminates (FMLs) are usually more complicated in the failure aspect as compared to their constituents, especially when complex load is applied. In this paper, notched FMLs and the constituents, i.e., the aluminum and glass fiber reinforced plastic (GFRP) were subjected to off-axis tensile loading to evaluate the failure mechanism. Initial attention was paid on the off-axis dependence of mechanical responses, especially on its relation to the notch size. As expected, off-axis dependence of notched strength and notch sensitivity were closely related to the notch size, but different for GFRP laminates and FMLs due to their different damage behavior. Finite element model was employed to predict accurately the mechanical responses of FMLs, particularly for elucidating the damage mechanism. Failure of notched FMLs under off-axis loading was a combined transverse fracture and shear-off, while it was shear-dominated in notched GFRP laminates. Transverse fracture in aluminum appeared first, followed by the fiber breakage, which was postponed by the extensive subcritical damage. Thereafter, shear-failure in fiber and aluminum layers were encountered instantaneously at the descending part. Thus, the critical failure of off-axis notched FMLs was still tension-dominated as that in the on-axis case, but aluminum played the critical role.
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影响因子：
2.3
作者：
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通讯作者：
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影响因子：
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