Research on static tensile properties and loss mechanism of GLARE laminates

Abstract

To study the variation law of static tensile properties and damage mechanism of fiber metal laminates, this paper conducted static tensile tests on GLARE2-2/1, GLARE2-3/2, GLARE3-2/1, GLARE3-3/2, GLARE6-2/1 and GLARE6-3/2 specimens. During the testing process, the load data of the specimen, axial and transverse strain data were recorded, and full-field strain data of the specimen were captured using Digital Image Correlation (DIC) technology. After the test, the fractured samples were subjected to corrosion treatment using a 4% sodium hydroxide solution. A comparative analysis was conducted on the elastic modulus, tensile strength, stress-strain curve, and Poisson's ratio change curve. The fracture morphology of the specimen, strain cloud map before final fracture, and the process of strain difference formation were compared and analyzed. The results show that the bridging effect of fibers needs to be properly considered when using the hybrid model method to predict the tensile strength of the ±45°fiber-metal laminates. The role of the prepreg layer in the GLARE sample gradually increases after the metal material yields. For the same type of prepreg, the damage forms in different layers of the board are not exactly the same. Using the DIC method is helpful to study the damage process and boundary effects inside the fiber metal laminate.