Study on the Pin-load Distribution of Composite Joints with Protruding-head Bolts Based on Cumulative Damage

Abstract

This paper presents the investigation of the pin–load distribution law of composite mechanical joints with protruding-head bolts based on the theory of composite cumulative damage. The three-dimensional finite element analysis have been carried out by using the software ANSYS for the composite plates connected with protruding-head bolts. The friction on the contact surfaces of the composite joints, and the nonlinearity of the contact state and the preload on the bolts have been considered. The effect law of cumulative damage on the pin-load distribution of multiple-bolted joints has been achieved. The results manifest that the proportion of the pin-load distribution varies with the external load and is slightly different at diverse stages of loading considering the cumulative damage of the composite materials, that pin load at both ends is greater than in the middle.