复合材料机械连接在航空结构中应用广泛,在受力过程中,挤压破坏为主要关注的破坏模式.对于复合材料单钉连接结构,单剪有面外弯曲存在,双剪可视为孔边纯挤压受力模式.采用试验的方法,研究了相同孔径、厚度及铺层的单钉单剪与单钉双剪的破坏模式、挤压变形及屈服和挤压强度,发现单剪形式的二次面外弯曲对强度及变形影响大,双剪结构大幅提高了复合材料机械连接结构的屈服强度和挤压强度.在不改变铺层比例的前提下,通过改变铺层数量,探讨了层合板厚度对单钉单剪受力及破坏的影响,发现层合板的厚度增厚对单钉单剪的屈服及挤压强度提高不显著.
The mechanical bolted structures of composites are widely applied in aeronautical structures.In the proceeding of loading, compressional damage dominating the damage mode needs to be concerned.For single bolted joints of composites, single shearing case exists secondary bending, but double shearing only exists pure compressional loading mode.This paper adopted experimental methodology to study damage modes, compressional deformation, yield strength and compressional strength for single shear load and double shear load of single bolted joints of different thickness.It was found that the single bolted plates of composite under single shear load of secondary bending has strong effects on strength and deformation, and the single bolted plates under double shear load enhance yield strength and compressional strength substantially.In the condition of keeping plies percentage constant, by changing plies number, force analysis and damage of single bolted joints of single shearing were investigated.The resuits show that making composite plates thicker cannot improve yield and compressional strength obviously.
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