Three-dimensional stress analysis of bolted single-lap composite joints

A three-dimensional finite element model of bolted composite joints has been developed to determine non-uniform stress distributions through the thickness of composite laminates in the vicinity of a bolt here. An experimental programme was conducted Co measure deformations, strains, and bolt load on test specimens for validation of the numerical model developed. Strains in the radial direction at different radii and angles were measured in the vicinity of the bolt hole at the sheer plane between the plates. The degree of secondary bending in the joints was determined from strain measurements on both sides of the laminate at certain points. In the experiments, a number of parameters such as laminate layup, laminate thickness, bolt diameter, bolt type, cramping force and lateral support were varied. Each specimen configuration was analysed using the three-dimensional finite element model. Generally, comparison between computed and experimental results showed good agreement. (C) 1998 Elsevier Science Ltd. All rights reserved.