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TECHNICAL ARTICLE—PEER-REVIEWED

First Ply Failure Analysis of Rectangular Fiber Metal Laminated Composite Plates Subjected to Uniformly Distributed Loads Nandure Narayan Rao . Pavuluri M. V. Rao

Submitted: 7 April 2019 Ó ASM International 2019

Abstract Fiber metal laminates (FMLs) are the hybrid composite materials that needed analysis for using them toward applications as rectangular plates subjected to uniformly distributed loads. Determination of first ply failure (FPF) loads is the focus of the present study. These loads are identified by the procedure developed on the basis classical laminate theory (CLT), and Tsai–Hill criterion is used to identify the failure load. The developed procedure was validated by applying it to the standard cases reported in the literature. The failure loads and deformation of FMLs are presented in the form of dimensionless parameters, and their variation was studied for width-to-length ratios. FMLs of GLARE and Ti-CFRP are studied based on their importance to research. Keywords First ply failure  Fiber metal laminates  Uniformly distributed load  Classical laminate theory

Introduction Fiber metal laminates (FML) are the hybrid composite laminates consisting of metal layers and fiber reinforced polymer layers as laminas. These materials are introduced in 1978 at Delft University of Technology [1], and initial configurations consist of thin high strength aluminum alloy sheets alternately bonded to the plies of glass fiber reinforced epoxy laminas. These materials can be designed to have a specific improvement in properties [2] like fatigue resistance, impact resistance, corrosion resistance, etc. N. Narayan Rao (&)  P. M. V. Rao Vignan’s Foundation for Science Technology and Research, Guntur, India e-mail: [email protected]

Promising applications of this type of material encouraged the researchers to do experimentation with various types of metal layers and FRP layer layup orientations. FMLs with GFRP layers and aluminum metal layers are grouped under a family called as GLARE [3, 4] and are extensively investigated. This leads to the application of GLARE as fuselage structural material for Airbus A380 [5]. One more material group under the family of FML is the ARALL [5], with aramid fiber/epoxy prepreg and aluminum layers. Many new materials are also under investigation such as CFRPs with titanium layers [6, 7] CFRPs with magnesium layers [8, 9]. Satisfactory analytical techniques to predict the behavior and the availability of the data related to the behavior aspects of the material are the requirements to consider material for an engineering application. For this purpose, various researchers have published useful data for FMLs. Fatigue, fracture and impact response of various grades of GLARE are investigated [3] and reported. Analytical techniques to predict the behavior of stress–strain, impact, delamination are reported by investigators [10–15] as a support to the experimental analysis. Literature review reveals that similar type of exercises is being carried out for