Stress Concentration At Circular Cutouts in Buffer Strip Laminates
Composite laminates containing notches such as cracks and cutouts suffer a substantial reduction in static strength due to high stress concentrations. One of the methods for reducing such stress concentration has been to use a hybrid (buffer strip) construction. In the present study an approximate analytical model is developed for determining the stresses, strains, and stress concentration in a buffer strip laminate containing a circular cutout. The method is based on the classical shear-lag stress-displacement relations. An extensive parametric study is presented, using a number of material combinations, to understand the effect of stiffness and strength of the buffer strips on the laminate notched strength. The results show that lower modulus and higher failure strain buffer strips are most efficient in increasing the notched strength of laminates with circular cutouts.
E. S. Meyer and L. R. Dharani, "Stress Concentration At Circular Cutouts in Buffer Strip Laminates," AIAA Journal, American Institute of Aeronautics and Astronautics (AIAA), Jan 1991.
The definitive version is available at https://doi.org/10.2514/3.10826
Mechanical and Aerospace Engineering
Article - Journal
© 1991 American Institute of Aeronautics and Astronautics (AIAA), All rights reserved.