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为研究离位增韧对复合材料加筋板结构承载性能的影响,首先,分别对未离位增韧和离位增韧复合材料帽型长桁加筋板进行了三点弯曲试验,比较了2种加筋板的初始分层载荷、极限载荷以及试验现象;然后,利用ABAQUS建立了三维渐进失效模型,考虑长桁-蒙皮界面和复合材料层合板的失效,对界面的分层机制和蒙皮的失效过程进行了分析。结果表明:有限元结果与试验结果吻合较好,离位增韧仅能略微提高界面的初始分层载荷,但对极限载荷有较大提升;在分层起始阶段I型拉伸模式占主要作用,随着分层不断扩展,II型剪切模式占比持续增加,而剪切模式的高韧性正是离位增韧界面具有良好性能的重要原因。所得结论表明离位增韧界面有良好的抗剥离性能,且在剪切方向上的表现尤为突出。
In order to study the effect of dislocation toughening on the bearing capacity of composite stiffened panels, three-point bending tests were carried out on the stiffened stiffened composite panel capped stiffeners separately, The initial delamination load, ultimate load and test phenomenon of the two kinds of stiffened plates were discussed. Then, a three-dimensional progressive failure model was established by using ABAQUS. Considering the failure of the long stringer-skin interface and the composite laminates, the delamination mechanism and Skin failure process was analyzed. The results show that the finite element results are in good agreement with the experimental results, and the out-site toughening can only slightly increase the initial delamination load of the interface, but greatly enhance the ultimate load. In the initial stage of delamination, the I- As the layering continues to expand, the proportion of Type II shear modes continues to increase, and the high toughness of the shear modes is an important reason for the good performance of the interfaced toughening interface. The conclusions obtained show that the exfoliated toughened interface has good anti-stripping performance, and the performance in the shear direction is particularly prominent.