不同铺层复合材料螺栓连接的研究

EXPERIMENTAL STUDY ON DIFFERENT LAYER COMPOSITE BOLTED JOINTS

实验研究了在E/D=4(边距/孔径),W/D=5(宽度/孔径)的3种铺层[90/+45/-45/0]s,[90/0/+45/-45]s,[+45/-45/90/0]s的玻璃纤维/环氧复合材料试样在不同的扭矩和垫片尺寸(外径(Dw)/内径(D))下的静态破坏强度。实验结果表明,试样破坏强度随夹持力增大而增大,但增加趋势不断减弱,在5Nm扭矩下三种铺层的强度分别比其销钉连接增大175%,196%,141%;在销钉连接下,[90/+45/-45/0]s铺层强度比[90/0/+45/-45]s铺层高12.7%,[+45/-45/90/0]s铺层强度比[90/+45/-45/0]s铺层高10.8%;在手动拧紧下[90/+45/-45/0]s铺层强度比[90/0/+45/-45]s铺层高3.5%,而[+45/-45/90/0]s铺层强度比[90/+45/-45/0]s铺层高0.37%;垫圈的外内径比在2～3范围内,试样强度伴随外内径比的增大而增大,在3～4时,强度变化很小。

In this paper,an experimental study regarding the maximum bearing strengths of bolted-joint of glass epoxy composite laminate with [90/+45/-45/0]s,[90/0/+45/-45]s and [+45/-45/90/0]s stacking sequences is presented.The ratio of the distance from the hole center to the top edge to the hole diameter is four(E/D=4),and the ratio of the specimen width to the pin diameter is five(W/D=5).The results show that the bearing strength increase when the torque increase,but the trend is diminishing.When torque is 5N·m,strengths of three plies are found to be stronger when compared to pinned-joint by up to 175%,196%,141%.When it is pinned-joint,the strength of [90/+45/-45/0]s increases by 12.7% than [90/0/+45/-45]s,the strength of [+45/-45/90/0]s increases by 10.8% than [90/+45/-45/0]s.But when torque is used by hand,the strength of [90/+45/-45/0]s increases by 3.5% than [90/0/+45/-45]s,the strength of [+45/-45/90/0]s increases by 0.37% than [90/+45/-45/0]s.As the rate of washer outer diameter to inner diameter increases from 2 to 3,the bearing strength increases,but it changes very little when it is from 3 to 4.