In order to solve the strength problem of carbon fiber laminate joint

the finite element model for three bolts double lap joint of carbon fiber laminate is established

and the progressive damage of the joint in the tension are analyzed in terms of the Hashin criterion. The analysis results show that in the tension

the laminate damage occurs firstly at the first bolt

and as the damage worsens

the blot load is redistributed. Finally

the laminate breaks at the first bolt

and the other two bolts suffer from local extrusion damage. Based on the finite element model

the distribution of bolt load in the connection between the various metal plates and the carbon fiber laminates

and the impact of spacing among bolts in the joint on the distribution of bolt load are analyzed. The blot load becomes more unequal as the rigidity of the linked metal plate increases. When the spacing among bolts is increased

the blot load becomes more unequal. The findings in the study may be used to improve the extrusion strength design of a composite multi-blot joint.