Tensile Failure Behavior And Temperature Response Of GLARE Laminates

GLARE laminate(glass fiber reinforced aluminum alloy laminate)is composed of glass fiber/epoxy resin composite materials and high-strength aluminum alloy sheets alternately laminated,using adhesive bonding technology is cured under certain temperature and pressure.It has the advantages of metal and fiber-reinforced composite materials,such as high specific strength,good impact resistance and fatigue crack growth resistance,is an extremely excellent aviation material.GLARE laminates used in aircraft structural parts often require prefabricated holes of various shapes and sizes to achieve structural component connection and system structure weight reduction.When these structures are subjected to service loads,stress concentration will occur around the holes,which will affect their performance.In this paper,the GLARE is prepared based on the hot compression molding process.The experimental and finite element simulation methods are used to study the tensile properties of the GLARE laminate with circular and square holes and the failure modes of the laminate components.Based on the modified point stress criterion,the theoretical prediction of the residual strength of the GLARE with circular holes is carried out.The results show that the prediction model is in good agreement with the experimental data;through the model and the relationship between the residual strength of the GLARE laminate with holes,A semi-empirical model for predicting residual strength of GLARE laminates with square holes is proposed.Through the finite element simulation method,the residual strength of the GLARE with holes and the damage failure mechanism of each component of the composite are analyzed,and the tensile properties and damage of the GLARE with square holes are explored by the fillet radius and off-axis angle.The influence of the failure mode reveals the evolution process of interlayer interface damage,fiber damage and matrix damage,as well as the influence of the shape and size of the hole.The simulation results are basically consistent with the experimental failure mode,and the tensile properties are within a reasonable error range.In addition,the tensile properties and failure behavior of GLARE laminates with circular and square holes after different thermal exposure temperatures were analyzed,revealing the mechanism of the influence of temperature on their behavior.