Development And Analysis Of Flexible Thermoplastic Composite Laminate For Anti Stabbing Apllications

Nor Hafira Nadia, Cm Hatta (2015) Development And Analysis Of Flexible Thermoplastic Composite Laminate For Anti Stabbing Apllications. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

This research focuses on the development and analysis of laminate composite using HDPE and LDPE as matrix materials. This matrix was combined with glass fiber and aramid fiber as reinforcement materials through hot press method in order to identify the flexural properties and anti-stab performance of the proposed composite. There are seven samples for both matrix which undergoes flexural test and quasi static stab test. The flexural test was conducted according to ASTM D790 standard and quasi static stab test was based on NIJ 0115.00 standard. This research use two different sizes of knives which are a small size of knife, P1 and a big size of knife, S1. The stabbing effect of these two knives has been compared. The failure effect after quasi static stab test is observed by using scanning electron microscope (SEM). The finding shows LDPE composite has lowest penetration force for total displacement of 20 mm and 50 mm for quasi static stab test. In contrast, HDPE has higher penetration force and bending force at the displacement of 20 mm and 50 mm. P1 showed higher effectiveness to penetrate the laminate composite for both matrix materials because P1 required less energy as compare to S1. Furthermore, HDPE shown higher efficiency compared to LDPE in resist the stabbing force. While in term of flexibility, LDPE obtain less force to resist deformation under load, the flexibility of LDPE is higher competed with HDPE. Moreover, delamination failure occurred on the sample at highest number of layers. This is due to weak adhesive bonding in between the matrix and fiber reinforcement. The pull out fiber and fiber breakage were observed on the fiber after the penetration.

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