2019 Volume 45 Issue 5 Pages 205-213
The effect of stress concentration on compressive failure behavior of carbon-fiber reinforced plastic e laminates with open holes was experimentally and numerically investigated. The aspect ratio of the elliptic hole was changed to determine the dependence of the failure behavior on stress concentration. The finite element analysis was implemented by using the ABAQUS 2017 software and a dynamic explicit solving method. Continuum shell elements incorporating Hashin’s failure criteria and cohesive interaction, which is a combined function of the general contact definition and cohesive traction-separation law, were used to model lamina and interlaminar damage growths, respectively. The damage initiations were defined by critical stresses, while the damage evolutions were defined by energy assumptions of softening behavior for the continuum shell elements and cohesive interactions. The numerical results of the stresses at initial damage occurrences and ultimate failures agreed well with the experimental results for the specimens of various aspect ratios. Moreover, the numerical and experimental results of the damage behavior of the 0º ply were in good agreement. Furthermore, we discussed internal damages and delamination behaviors, which are difficult to observe through experiments, based on the numerical results.
