Modeling the effective properties and thermomechanical behavior of SMA-SMP multifunctional composite laminates

Methodology is suggested for calculation of effective elastic constants of layer containing intralaminar cracks. Trends are presented for layers with low and medium high crack densities, where the interaction between cracks can be neglected. The effective properties of the damaged layer are determined by back- calculation using previously developed GLOB-LOC model for thermo-mechanical properties of damaged laminate [1]. It is shown that the effective transverse modulus and shear modulus of a layer decrease linearly with increasing crack density, whereas longitudinal modulus and major Poisson’s ratio do not change at all. Experimental data for multiple cracking are analyzed showing that linear approximation of crack density versus applied strain may have sufficient accuracy. These two linear trends are used to calculate the effective elastic properties of a layer as a function of strain.

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- Thermomechanical Behavior of Multiangle Composite Laminates

Structural Analysis of Polymeric Composite Materials ◽

10.1201/b13672-10 ◽

2012 ◽

pp. 277-414

Keyword(s):

Composite Laminates ◽

Thermomechanical Behavior

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Effective Properties of Fiber-Reinforced Composite Laminates

Fundamentals of Micromechanics of Solids ◽

10.1002/9780470117835.ch9 ◽

2007 ◽

pp. 214-244

Keyword(s):

Composite Laminates ◽

Effective Properties ◽

Fiber Reinforced ◽

Fiber Reinforced Composite ◽

Reinforced Composite

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Effective Thermomechanical Behavior of Plain-Weave Fabric-Reinforced Composites Using Homogenization Theory

Journal of Engineering Materials and Technology ◽

10.1115/1.2904262 ◽

1994 ◽

Vol 116 (1) ◽

pp. 99-105 ◽

Cited By ~ 50

Author(s):

A. Dasgupta ◽

S. M. Bhandarkar

Keyword(s):

Effective Properties ◽

Three Dimensional ◽

Thermomechanical Behavior ◽

Woven Fabric ◽

Homogenization Theory ◽

Reinforced Composites ◽

Fiber Volume ◽

Shear Moduli ◽

Plain Weave ◽

Weave Fabric

A micromechanical analysis is presented to obtain the effective macroscale orthotropic thermomechanical behavior of plain-weave fabric reinforced laminated composites based on a two-scale asymptotic homogenization theory. The model is based on the properties of the constituents and an accurate, three-dimensional simulation of the weave microarchitecture, and is used for predicting the thermomechanical behavior of glass-epoxy (FR-4) woven-fabric laminates typically used by the electronics industry in Multilayered Printed Wiring Boards (MLBs). Parametric studies are conducted to examine the effect of varying fiber volume fractions on constitutive properties. Nonlinear constitutive behavior due to matrix nonlinearity and post-damage behavior due to transverse yarn failure under in-plane uniaxial loads is then investigated. Numerical results obtained from the model show good agreement with experimental values and with data from the literature. This model may be utilized by material designers to design and manufacture fabric reinforced composites with tailored effective properties such as elastic moduli, shear moduli, Poisson’s ratio, and coefficients of thermal expansion.

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