The Failure Characterization of Composite Pinned Joints

Abstract

An analytic model was developed to predict the failure strength of pin loaded composite joints using a two-dimensional analysis. The characteristic dimensions, which define the characteristic curve, were obtained by stress analyses associated with no bearing and tensile tests on laminates with and without a hole. The available experimental data in the literature was then used to evaluate the joints' strength. There was a good agreement between the experimental data and the computed joints' strength. Additionally, the failure mode that characterizes the failure condition depends on the orientations of the laminas that constitute the laminate used for joint construction.

Investigation on failure modes for pin joints made from unidirectional glass–epoxy nanoclay laminates

“…Moreover, it is rarely possible to produce a construction without joints because of limitations on material size, convenience in manufacture or transportation and the need for access. But these joints are susceptible to high stress concentrations which occur around and in the vicinity of the hole and are often the cause of unexpected failure in composite structures . The high stress concentrations reduce the efficiency of the joint along with the redistribution of stresses near the discontinuities .…”

Stress-Distribution around Pin-Loaded Hole for Orthotropic Laminates

“…Mechanically fastened joints included bolted, riveted, and pinned joints. These joints are susceptible to high stress concentrations which occur around and in the vicinity of the hole and are often the cause unexpected failure in composite structures containing joints [1,2,3,4,5,6,7,10]. Therefore, adequate design of mechanical joint requires correct determination of the stresses, bearing strength and mode of failures of the joint.…”