| 摘要 |
A system is disclosed for analyzing a mechanically fastened lap shear joint and for determining the stress state in the fastener and in holes surrounding the fastener. Each fastener is modeled as a line element in a computer-based finite element model. A stiffness matrix representative of the fastener is incorporated into the system stiffness matrix, allowing nodal displacements and forces of the line element to be determined. Coefficients of the stiffness matrix are calculated based on a model of the fastener as a beam supported by elastic supports. The calculation procedure includes calculating distributed forces resulting from unit displacements imposed separately on the line element nodes, while the other line element nodes are assumed fixed. Concentrated forces equivalent to the distributed forces are calculated by work-averaging the continuous forces. The line element stiffness matrix coefficients are calculated, allowing the stress state in the holes and fastener to be determined.
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