A Theoretical Model for Estimation of Yield Strength of Fiber Metal Laminate

International Conference on Materials, Alloys and Experimental Mechanics 2017

材料科学;金属学;机械制造

Bhat, Sunil^1 ; Nagesh, Suresh^1 ; Umesh, C.K.^2 ; Narayanan, S.^2

PES University, Bangalore, Karnataka

560087, India^1

VIT University, Vellore, Tamil Nadu

632014, India^2

关键词: Axial tensions;    E-glass fibers;    Fiber metal laminates;    Glare laminates;    Metal layer;    Prepregs;    Stress state;    Theoretical modeling;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/225/1/012100/pdf
DOI  :  10.1088/1757-899X/225/1/012100

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

The paper presents a theoretical model for estimation of yield strength of fiber metal laminate. Principles of elasticity and formulation of residual stress are employed to determine the stress state in metal layer of the laminate that is found to be higher than the stress applied over the laminate resulting in reduced yield strength of the laminate in comparison with that of the metal layer. The model is tested over 4A-3/2 Glare laminate comprising three thin aerospace 2014-T6 aluminum alloy layers alternately bonded adhesively with two prepregs, each prepreg built up of three uni-directional glass fiber layers laid in longitudinal and transverse directions. Laminates with prepregs of E-Glass and S-Glass fibers are investigated separately under uni-axial tension. Yield strengths of both the Glare variants are found to be less than that of aluminum alloy with use of S-Glass fiber resulting in higher laminate yield strength than with the use of E-Glass fiber. Results from finite element analysis and tensile tests conducted over the laminates substantiate the theoretical model.