Effect of different impactor nose on laminated composite structure under quasi static loading

Lay, Yan Ten (2015) Effect of different impactor nose on laminated composite structure under quasi static loading. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

This research focuses on the effect of three different nose design on glass fiber reinforced polyester composite laminates under different quasi-static speed loading. Laminated composite which act as target material is fabricated in orientation of unidirectional with 6 layers of plies by using vacuum bagging. A total 75 sample is tested under quasi-static test using three different impactor which is blunt, conical and hemispherical nosed impactor under loading speed of 10, 20, 30, 40 and 50 mm/min. A further comparison was made with the maximum force required of each of the impactor. The fracture behavior of laminated composite caused by different inpactor is monitored under the scanning electron microscope to determine the type of failure occur after quasistatic test. The finding shows conical nosed impactor required lowest force to penetrate the target material followed by hemispherical and blunt nosed impactor. Conical impactor shows the most effective impactor while hemispherical nosed impactor is 15 % less than conical while blunt nosed impactor is 74 % less. As the loading speed increased, the force needed for each impactor is increased. Form the finding, loading speed of 30 mm/min shows the best speed for quasi-static to carry out. Furthermore, energy absorption that caused by three impactor shows that conical nosed impactor produced smallest range of plastic zone where hemispherical nosed impactor and blunt impactor create 1.8 % and 11.6 % higher range in plastic zone. Pull out of fibers and fibers breakage is observed on the sample after testing. The failure characteristic changed from fiber pull-out to fiber breakage. The nose surface area in contact with the target material produce high effect on the failure behavior of target material, the smallest the area, the highest the resistance of target material to the penetration.

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