Mechanical properties of the riveted connecting forming of CFRP plates
Mechanical properties of the riveted connecting forming of CFRP plates
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DOI：
10.1007/s12289-017-1344-9
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发表时间：
2018-03
影响因子：
2.4
通讯作者：
M. Okayasu;R. Naito
中科院分区：
文献类型：
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作者：
M. Okayasu;R. Naito
通过对不同铆接形式的单向碳纤维布的受力性能进行试验研究，提出了适用于碳纤维布的铆接连接方法。在这种方法中，用不同的位置和不同的数量进行铆钉连接。连接强度与断裂方式有关。在基本情况下，得到了两种不同的断裂模式：基于铆钉的断裂和基于CFRP的断裂，其中以铆钉和CFRP为主的试件分别获得了高强度和低强度。然而，除了这两种断裂模式外，CFRP中存在微裂纹的铆钉失效也被检测到。微裂纹使应力-应变曲线发生变化，但与铆钉断裂试件一样，强度仍较高。碳纤维复合材料的失效是由于纤维/基体界面脱粘所致。通过CFRP板中电流的变化，可以监测CFRP板在剪切加载过程中的破坏特征。这种方法的概念是研究由于材料失效而引起的电阻变化。在这种情况下，电流值的减小与铆钉和CFRP中的故障有关。随着铆钉的形成，改变了破坏模式，并确定了合适的铆钉位置，使CFRP板的连接强度较高。
Mechanical properties of the unidirectional CFRP sheets connected by various rivet formations are experimentally investigated to propose the suitable riveted connection of the CFRP sheets. In this approach, the rivet connection is conducted with different position and different number. The connecting strength is dependent on the fracture mode. In basic, two different fracture modes are obtained: rivet- and CFRP-based fracture, where the high and the low strength are obtained for the sample fractured mainly by rivet and CFRP, respectively. However, in addition to the two fracture modes, rivet failures with micro-crack in CFRP are detected. The micro-cracks make change of the stress-strain curve although, like the rivet fractured sample, the high strength is still obtained. The failure in CFRP is attributed to the fiber/matrix interfacial debonding. The failure characteristics of CFRP can be monitored during the shear loading test with variation of the electric current in the CFRP plates. The concept of this approach is to examine the change of the electric resistance due to the material failure. In this case, the decrement of the current value is related to the failure in the rivet and CFRP. With the rivet formation, the fracture mode is altered; and appropriate rivet positions are determined to make the high connecting strength of the CFRP plates.