Strength of Quasi isotropic glass fiber laminate
Mohammed Ali, Mohammed Ali Salman (2020)
Mohammed Ali, Mohammed Ali Salman
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This thesis investigates the mechanical properties of 2 types of quasi-isotropic laminate. The laminates are glass fiber (UD warp knitted textile at 1152 g per m2) infused using (ATLAC ENOVA 6215 resin). The laminates were manufactured using vacuum lamination technique. The sheets were then cut using water cutting technique in order to create the samples. The sample have a dimension of 15 mm in width, 180 mm in length, and thickness depending on the type of laminate. 6 layers quasi-isotropic laminate has an average thick-ness of 5.5 mm, and 8 layers quasi-isotropic laminate has an average thickness of 7.4 mm. The samples were subjected to 3-point bending test in order to determine the mechanical properties (bending modulus and bending strength). Composite Compressive Strength Modeller software (CCSM) was used to model 2 types of quasi-isotropic laminate (6 and 8 layers) with different orientation of layers in order to investigate failure analysis and find the most optimal lay-up of quasi-isotropic in terms of young’s modulus, shear modulus, and bending modulus in x, y, xy direction. The hypothesis of this thesis is that both lami-nates have the same young’s modulus but laminate 2 has a longer crack length than lami-nate 1 because in redirect cracks at a big angle making the total crack length longer. The hypothesis was that the laminate 2 as compared to laminate 1 has a 41% larger strength due to higher failure strain. Experiment results for support distances at 60 mm show this to be true with a percentage error of 7.11%. Experiment results for speed of the force at 10 mm/s show this to be true with a percentage error of 8.6%. Experiment results for other speeds and lengths showed a higher percentage error. The thesis answers the question of what is the ideal quasi-isotropic setup that gives at minimum investment the largest strength. Ac-cording the result obtained from the samples tested and CCSM software, 6 layers quasi-isotropic laminate gives at minimum investment the largest strength.