An experimental study on quasi-static indentation, low-velocity impact and damage behaviors of laminated composites at high temperatures. Issue 9 (November 2021)

• Record Type: Journal Article
• Authors: Djele, Akim; Karakuzu, Ramazan
• Is Part Of: Polymers and polymer composites. Volume 29:Issue 9(2021)Supplement
• Page Start: S969
• Page End: S977
• Publication Date: 2021-11
• Subjects: Quasi-static indentation -- low-velocity impact -- high temperature -- absorbed energy -- S2-glass fabric/epoxy -- Carbon-Kevlar hybrid fabric/epoxy; Polymers -- Periodicals; 668.905
• DOI: 10.1177/09673911211016932
• Languages: English
• ISSNs: 0967-3911

Abstract

Nowadays, fiber reinforced laminated composites are widely used in many applications due to their high strength/weight ratio. However, these materials are very sensitive to transverse loading. The low-velocity impact test has been widely used by researchers to simulate the transverse loading. However, the low-velocity impact tests are highly toilsome, and this test requires expensive hardware and software systems. To reduce the experimental costs of the low-velocity impact test, it will be more attractive, much simpler, cheaper and more widely available to achieve impact behavior using quasi-static tests. Thus, to compare both tests, in this work the absorbed energy and force-deflection curves obtained by low-velocity impact and quasi-static indentation loading in two different fiber reinforced epoxy composites have been investigated. The Carbon-Kevlar hybrid fabrics and S2 glass fabrics were used as reinforcements. For low-velocity impact tests, a range of energies was used between 20 and 80 J. For quasi-static indentation test, the crosshead speeds were increased gradually from 1 mm/min to 60 mm/min. In addition, tests at 23°C, 40°C, 60°C and 80°C were made to examine the effect of temperature on these tests. As a result of the quasi-static tests performed, the amount of energy required to perforate the samples at a certain test speed is at the same level as the low-velocity impact test. Thus, the required energy amount for the perforation of the materials can be found by performing a quasi-static test at an appropriate speed, rather than the low-velocity impact test.