论文部分内容阅读
针对自动铺丝复合材料T型接头,开展了Z-pin增强对结构件拉脱以及剪切性能影响的试验研究及数值模拟,拉脱试验和剪切试验分别在电子拉伸试验机(CMT5504)和MTS大吨位疲劳系统上进行。试验研究了Z-pin增强和非增强两种试件,绘制了位移-载荷曲线图。拉脱试验结果表明:Z-pin增强可显著提高拉脱承载能力,同时,与非增强T型接头相比,Z-pin增强明显延缓了掉载。试验件的破坏位置都在中间层和蒙皮之间;剪切试验结果表明;Z-pin增强可显著提高剪切承载能力,Z-pin增强试验件的破坏位置在筋条和中间层之间,非增强的试验件的破坏位置在中间层和蒙皮之间。在此基础上建立了T型件拉脱以及剪切有限元模型,采用内聚力模型模拟界面的破坏情况,在分层的部位建立添加非线性弹簧来模拟Z-pin的增强作用,模拟结果与实验结果比较吻合,验证了模型的有效性。
The experimental research and numerical simulation of Z-pin reinforcement on pull-off and shear performance of structural members are carried out for the automatic T-shaped connector of wire-drawn composite materials. The pull-off test and the shear test are respectively carried out on an electronic tensile tester (CMT5504) And MTS large-tonnage fatigue system. Two kinds of specimens, Z-pin reinforced and non-reinforced, were tested and the displacement-load curve was drawn. The pull-off test results show that the Z-pin reinforcement can significantly improve the pull-off carrying capacity, while the Z-pin reinforcement significantly slows the load shedding compared with the non-reinforced T-joint. The failure position of the test piece is between the middle layer and the skin; the shear test results show that the Z-pin reinforcement can significantly improve the shear bearing capacity, and the damage location of the Z-pin reinforcement test piece is between the ribs and the middle layer , Non-reinforced test piece damage location between the middle layer and the skin. On the basis of this, a T-piece pullout and shear finite element model was established, and the cohesion model was used to simulate the damage of the interface. A non-linear spring was added to simulate the enhancement of Z-pin in the layered part. The simulation results and experiments The results are in good agreement to verify the validity of the model.