复合材料层合板沉头螺栓接头拉伸性能试验与有限元仿真

根据ASTM标准设计了复合材料沉头螺栓单钉单搭接头拉伸性能试样,并完成试验件的制备和挤压性能试验。试验过程中采用非接触全场应变测量系统(VIC-3D)对载荷-位移曲线、表面应变场、沉头板上表面面外位移等试验数据进行了采集。基于Abaqus/Standard和Abaqus/Explicit模块建立了复材接头单向拉伸的静力隐式和动力显式三维有限元模型,利用模型搭接区域的变形对试验结果进行验证。采用静力隐式算法所得接头挤压刚度和层合板上表面末端面外位移与试验值的误差分别为14.4%和20.5%;采用动力显式算法所得接头挤压刚度和层合板上表面末端面外位移与试验值的误差分别为13.1%和11.9%。采用动力显式算法精度较高,而且其在接触建模时稳健性很强,可用于后续多钉连接接头以及整体壁板等大型复杂结构建模。

Extruding Performance Test and Finite Element Simulation of Countersunk Composite Joint

A testing of tensile property of countersunk composite single-hole and single-lap joint based on the ASTM standard was designed and completed. During the test, the experimental data such as load-displacement curve, surface strain field and displacement outside of upper surface were collected by non-contact field strain measurement system (VIC-3D). The unilateral stretching static implicit and dynamic explicit 3D finite element models of the composite joint are established based on the Abaqus/Standard and Abaqus/Explicit respectively. The test results are verified by the deformation of the lap region. Compared to the test results, when using dynamic explicit algorithm, the error of squeezing stiffness of the joint and the out-of-plane displacement of upper surface are 13.1% and 11.9% separately. While using static implicit algorithm, the error are 14.4%and 20.5% respectively. Therefore, the dynamic explicit algorithm is more accurate, and there is strong reliability on contact modeling, which can be applied to multi-hole joint and some large complex structures modeling for example the integral panel modeling subsequently.