Research Progress on Interlaminar Failure Behavior of Fiber Metal Laminates

Abstract

Fiber metal laminate (FML) is a kind of lightweight material with excellent mechanical properties combining advantages of metal laminates and fiber reinforced composites. It has been widely used in the aerospace and transportation fields and is especially used as structural material such as aircraft skins, wings, and tails. However, under complex service conditions, interlaminar failure in FMLs greatly reduced mechanical properties of the material, even leading to serious economic and safety disasters. The failure and destruction of important structural parts of aircraft and other manned transportation vehicles are extremely unsafe for people. Therefore, it is of great significance to summarize the interlaminar failure behavior of FMLs and find ways to avoid these defects. This review paper is a collection of various researches done by many groups, which systematically discuss the interlaminar failure behaviors and their control methods of FMLs. The application status of several common FMLs in aircraft structures was given. The common interlaminar failure modes of FMLs and the testing and evaluation methods of interlaminar properties were stated. The failure mechanisms and the corresponding control methods were analyzed. Finally, the future developments of FMLs were also discussed by the authors. Through this review article, readers can obtain new research progress about the control method, the mechanism and future development on the failure behavior of FMLs in a more efficient way.

Damage to inverse hybrid laminate structures: an analysis of shear strength test

“…In the case of specimens S1 and S2, (i) interlaminar shear failures manifested by end openings are visible, which caused separation of the GFRP layers from the Al alloy core on almost half of the lower surface of the core, marked by the arrows (i) on Figure 5; local shear debonding [arrows (ii)] is also visible in these specimens. The damage types are, besides shear misalignment, characteristic defects formed in FMLs under pure shear stress [17]. Similar de-fects are presented for GLARE materials [15], in which debonding failure occurred near the neutral layer.…”

“…This parameter is one of the main material features influencing the possibility of forming FMLs by such processes as press brake bending or deep drawing [4]. ILSS can be tested by a number of methods, including the double-notch shear (DNS) test [16] and the three-point-bending load short-beam shear (SBS) test [17]. The last of the enumerated methods is currently used as a standard ILSS test according to American Society for Testing and Materials (ASTM) D2344 [15] and Deutsches Institut für Normung (DIN; German Institute for Standardisation) Europaische Norm (EN; European standard) 2563 or similar, used for high-modulus reinforced composites (International Organization for Standardization [ISO] EN ISO14130 [18].…”

Comparative Analysis of Drilling Behaviour of Synthetic and Natural Fiber‐Based Composites

“…e effect of input process parameters of drilling, namely, specimen thickness, tool feed, and drill rate, on delamination of glass fiber-based composites is studied. e results reveal the effect of sample thickness and drill rate more on the debonding at the exit and the influence of sample thickness and feed rate on the push-down delamination [25,26].…”

New Advances and Future Possibilities in Forming Technology of Hybrid Metal–Polymer Composites Used in Aerospace Applications

“…There are four grades of ARALL composites, differing mainly in the grade of the base material (ARALL: 1-7075-T6; 2-2024-T3; 3-7075-T76; 4-2024-T8). ARALLs have not been widely used due to their low strength and durability on the metal-composite interface, low strength of the fibre-matrix connection, and high production costs [13][14][15]. CARALL is a laminate made of layers of a polymer composite reinforced with carbon fibres preimpregnated with epoxy resin and layers of aluminium [16][17][18].…”

“…Composite materials consisting of thermoplastics are mainly produced by the method of "hot" pressuring in presses using chilled moulds, AFP, and methods of continuous pultrusion [47]. In terms of the mechanical strength of FMLs, the most advantageous method of producing FMLs is the autoclave method, which uses the simultaneous action of pressure, vacuum, and temperature [15,48].…”