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Fatigue characteristics of the bolted joints for unidirectional composite laminates

机译：单向复合材料层板螺栓连接的疲劳特性

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摘要

When composites are employed as structural materials, joining of composites to other materials is necessary because manufacturing structures with composites only is not generally feasible. Although the maximum static strength of the composite bolted joint is frequently realized by quasi-isotropic patterns, these patterns are seldom used in structural members under general load, such as bending, compressive, and tensile load. To increase the efficiency of whole structures with the composite bolted joints, the laminate with stacking sequence of [±θ/0_8]_S was proposed in this work. The fatigue characteristics of the [±θ/0_8]_S laminate bolted joint were investigated with respect to the angle θ and the bolt clamping pressure and compared with the result of the [0_2/±45_3/90_2]_S laminate, which was proposed as one of the optimum stacking sequence under the static load. From the experiments on the bolted joints, it has been found that the laminates whose major plies are stacked in the axial direction can be used for the bolted joint structures under fatigue load when an appropriate clamping pressure is applied to the bolted joint.
机译：当使用复合材料作为结构材料时，将复合材料连接到其他材料是必要的，因为仅使用复合材料制造结构通常是不可行的。尽管复合螺栓连接的最大静态强度通常是通过准各向同性的方式实现的，但是在一般载荷（例如弯曲，压缩和拉伸载荷）下，这些模式很少用于结构构件中。为了提高采用复合螺栓连接的整体结构的效率，本工作提出了堆叠顺序为[±θ/ 0_8] _S的层压板。研究了[±θ/ 0_8] _S层压板螺栓连接点的疲劳特性，分别针对角度θ和螺栓夹紧压力，并将其与[0_2 /±45_3 / 90_2] _S层压板的结果进行了比较。静态载荷下的最佳堆垛顺序之一。从螺栓接头的实验中发现，当在螺栓接头上施加适当的夹紧压力时，主要层沿轴向堆叠的层压板可在疲劳载荷下用于螺栓接头结构。

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