Degradation model based on Tsai-Hill factors to model the progressive failure of fiber metal laminates

Abstract

An analytical formulation is developed to estimate the strength of the fiber metal laminates (FML) consisting of cross-ply glass fiber reinforced plastic layers and aluminum sheets. Classical lamination theory is taken as basis for the formulation. A new degradation model based on Tsai-Hill terms is developed and used with analytical formulation to assess the progressive failure. Appropriate features are incorporated in the model to distinguish the matrix failure, the fiber matrix debonding, the fiber failure, and the failure of the isotropic layer. The formulation is used to predict the failure behavior of a FML under in-plane off-axis loading. Different strengths associated with the failure of the laminate like stress at first ply failure and yielding of isotropic layer are investigated. The results show that the new degradation model facilitated the detailed estimation of failure progression. These values of predicted strength are more accurate and closer to the actual experimental results than that of the values predicted by any other model.

Micromechanics Modeling of Transverse Tensile Strength for Unidirectional CFRP Composite

“…FRP composites are treated as homogeneous and anisotropic in macromechanics failure theories, including maximum stress failure theory, maximum strain failure theory, Tsai-Hill failure theory [ 6 ] and Tsai-Wu failure theory [ 7 ], etc. Although such theories have been employed with considerable success, they are phenomenological [ 8 ] and incapable of investigating the failure mechanisms and the damage mode of composites.…”

A Numerical Approach to Estimate First Ply Failure of Fibre Metal Laminate

“…Solutions are arrived by combining with different failure criteria for identification of FPF [9][10][11]. Out of many such failures criteria, study shows Tsai-Hill failure criteria has been used by many researchers because of its simplicity in implementing in finding FPF loads [9,12]. Majority of the work is focused on symmetrical crossply laminates.…”