Application of Micromechanics to Joints and Cutouts

摘要

The stress distribution in loop and bolt joints made of composite materials is studied using analytical and experimental methods. Also, the stress concentration in orthotropic composite sheets with a circular hole is studied. The numerical technique to evaluate the stresses and displacements is described. Simple design formulas to compute the stresses at critical regions are developed. A procedure of structural design is delineated and applied to specific cases. Experimental results obtained by testing composite joints are reported. Stress distribution tests were performed using the photoelastic technique. Failure location and ultimate loads for several composite joints are shown. This report contains the analysis of the stress concentration that appears around a circular hole in an orthotropic composite sheet under simple tension and simple shear loadings. (Author)