Evaluation of tensile properties of fiber metal laminates under different strain rates

Abstract

There has been an ever-going need for materials containing excellent mechanical properties, lower density, and improved fuel efficiency in the aerospace industry. To date, Fiber Metal Laminates (FMLs) are a prime choice for aerospace applications. The components of aircraft are subjected to various mechanical loadings under operating conditions; therefore, an in-depth understanding of material behavior under expected loading conditions is imperative for the meticulous design and manufacturing of these components. To evaluate the tensile behavior of the FMLs containing Aluminum 7075-T6 sheets as a metallic phase was the primary aim of this study. Furthermore, the manufactured composites were treated with the processes including surface de-greasing, mechanical abrasion, and anodizing. In order to perform mechanical characterization, uniaxial tensile tests were conducted at various strain rates 2×10−4 s−1, 5×10−4 s−1 and 8×10−4 s−1. The FMLs were fabricated through vacuum-assisted resin transfer molding (VARTM) process. The results revealed that FMLs based different combinations of the fiber and metal constituents exhibited a low degree of strain rate-sensitivity. In the case of CARALL, 1.7% increase in tensile strength was observed, and, its tensile strength was increased from 741 MPa to 754 MPa. Whereas, ARALL and GLARE laminates exhibited high degree of strain rate-sensitivity. When the strain rate is increased from 2×10−4 s−1, 5×10−4 s−1 and 8×10−4 s−1 the values are increased in the following patterns: 389 MPa, 411 MPa, and 475 MPa for GLARE laminates, and 253 MPa, 298 MPa 352 MPa for ARALL laminates. Thus, 39% and 22% increase in the tensile strengths were noted for ARALL and GLARE laminates, respectively.

Investigation of Mechanical Properties of Layered Composites Formed from Glass, Carbon and Aramid Fibers and Aluminum Plates

“…Whereas, Arall and Glare laminates exhibited high degree of strain rate-sensitivity. When the strain rate is the values are increased in the following patterns: 389 MPa, 411 MPa, and 475 MPa for Glare laminates (22% increase), and 253 MPa, 298 MPa 352 MPa for Arall laminates (39% increase) [7]. Asghar et al ( 2017) stated that ultimate tensile strength of sheets is related to nature of their components [8].…”

“…Scanning electron microscope images and subsequent electron scattering spectrum data showed that adhesion on aluminum was much better in anodized and cured layers. Khalid et al (2022) treated their manufactured composites with surface de-greasing, mechanical abrasion, and anodizing. In order to perform mechanical characterization, uniaxial tensile tests were conducted at various strain rates.…”

4D Printing: Technological and Manufacturing Renaissance

“…[139] SMPs are widely praised and adopted by researchers for their ease of printability, exceptional performance, and extensive scope in 3DP. [140] SMPs transform their shape due to one of two mechanisms: the SME or the shape [127] Copyright 2022, the Author(s). Published by Elsevier).…”

Investigations on the development of impact-resistant thermoplastic fibre hybrid composites from glass and steel fibre

“…[5][6][7] The hybridisation of high-performance fibres with metals has so far been mainly limited to the macroscopic scale, involving layered combination of metal and highperformance fibres as hybrid fibre composites. [8][9][10] At the macroscopic scale, a notable technique is laminate hybridisation, where alternating layers of metal sheets and FRP are systematically combined. These composites, known as fibre-metal laminates (FMLs), include metal sheet layers together with FRPs, as seen in examples such as CARALL (carbon fibre reinforced epoxy/aluminium foil laminate), ARALL (aramid fibre reinforced epoxy/ aluminium foil laminate) and GLARE (glass fibre reinforced epoxy/aluminium foil laminate).…”