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A three-dimensional finite element model has been developed to study the temperature effects on stiffness in linear-elastic range of the bolted metal-composite joints. In this study a quasi symmetric lay up for CFRP / vinyl ester epoxy laminate is used in conjunction with aluminum alloy (AA 7075 T6), having different thermal expansion coefficients. This generates an uneven load deformation characteristics and three dimensional stress field around the hole in single lap single bolt joints. The finite element model (FEM) was developed in commercial software PATRAN and the analysis including geometric and full nonlinearity frictional based contact has been performed using NASTRAN SOL 400 solver. The numerical model was calibrated using comparisons of the experimental measurements for surface strains and axial stiffness. The ability of the model to capture the three dimensional effects such as secondary bending and through thickness variation of stresses and strains in the presence of temperature variations is highlighted. The numerical and experimental results concluded that the thermal expansion material properties have a strong effect on the stiffness and linear behavior of the single lap, single bolt hybrid metal composite joints. Key Works: Composites, Bolted Joints, Thermal Expansion, Joint Stiffness

Thermal Effects on Single - Lap, Single - Bolt, Hybrid Metal – Composite Joint Stiffness