Pre-tightening force and the mode of connection are of great influences on
progressive damage of connection. Two three-dimensional.3D.models of composite
laminates with bolted joint are developed with the finite element software and compared with
the analytical results. Using 3D failure criteria, the influences on the strength and progressive
damage of composite laminates with bolted joint are analyzed. The results indicate that the
connection strength in single-lap laminated plates increases by a given range of pre-tightening
force, but the connection strength will be reduced by excessive level of pre-tightening force.
orce, but the connection strength will be reduced by excessive level of pre-tightening force.
While in double-lap laminated plates, it increases with the addition of pre-tightening force.
The connection strength of double-lap laminated plates is higher than that of the single-lap
laminated plates. It may be attributed to the secondary bending because of the eccentric load.
The initial failure loads of composite laminates are improved with the appropriate pre-tightening
force. Delamination and matrix cracking failure load of composite laminates are
reduced and the connection strength is improved.
Keywords: composite material; bolt joint; pre-tightening force; mode of connection; progressive damage
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