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为提高螺栓连接层合板结构的可靠性和承载能力,基于ABAQUS软件及用户子程序(USDFLD),结合改进的单胞模型,建立了考虑组分材料失效的多尺度数值模型。利用该模型表征分析了单钉双剪层合板螺栓连接结构的力学性能,研究了铺层形式及几何尺寸对连接结构性能的影响。该模型的预报结果与试验结果吻合较好。结果表明:准各向同性层合板螺栓连接结构的挤压强度高于正交各向异性层合板连接结构的挤压强度,前者的失效模式为挤压失效,后者为剪出失效,该模式导致结构承载能力降低,设计中应避免。层合板边径比大于3时,不同宽径比连接结构的挤压强度趋近稳定值;但相同边径比的连接结构,其挤压强度随宽径比的增大而增大,连接结构设计时应给予考虑。
In order to improve the reliability and load carrying capacity of bolted laminated structure, a multi-scale numerical model considering the failure of component materials was established based on the improved unit cell model based on ABAQUS software and user subroutine (USDFLD). The mechanical properties of the bolted joint of single-nailed and double-shear plywood were analyzed by the model characterization. The influence of the form and geometry of the ply on the performance of the joint structure was studied. The forecast result of this model is in good agreement with the experimental results. The results show that the extrusion strength of the quasi-isotropic laminates bolting structure is higher than the extrusion strength of the orthotropic laminates. The former failure mode is extrusion failure and the latter shear failure. As a result, the structural carrying capacity is reduced and should be avoided in the design. When the edge-to-wall ratio of the laminates is more than 3, the compressive strength of the connection structure with different width-diameter ratios approaches the stable value. However, the compressive strength of the connection structure with the same aspect ratio increases with the increase of the aspect ratio, Design should be given consideration.