Abstract
The effect of elevated and lowered temperatures on the elastic properties of carbon fiber-epoxy composite material was studied using multi-phase unit cell (MPUC) numerical model. Evaluation of the elastic properties of carbon fiber-epoxy composite material is based on the finite element method. Obtained results confirmed that elevated and lowered temperature has noticeable influence on elastic properties of carbon fiber-epoxy composite material. As demonstrated, this fact has considerable influence on accurate evaluation of generated thermal stresses in real laminated composite structures, exposed to extremely high or low operating temperatures.
Highlights
Composite materials are formed by the combination of two or more materials to achieve properties that are superior to those of its constituents
Evaluation of the elastic properties of carbon fiber-epoxy composite material is based on the finite element method
Reduction of composite structure strength is attributed to the fact that additional thermal stresses can significantly decrease estimated composite structure strength which is usually determined analytically, using Classical Lamination Theory (CLT)
Summary
Composite materials are formed by the combination of two or more materials to achieve properties (physical, chemical, etc.) that are superior to those of its constituents. The second source of external loads can be attributed to environmental factors (extreme operating temperatures) resulting in so-called thermal stresses. A typical example is an aircraft, having structural parts made of laminated composite material, exposed to extremely low (below -50 oC) or high temperatures (over 50 oC). These conditions may contribute to the reduction of composite structure strength in two ways. Reduction of composite structure strength is attributed to the fact that additional thermal stresses can significantly decrease estimated composite structure strength which is usually determined analytically, using Classical Lamination Theory (CLT). The second issue is associated with the fact that composite lamina strength is determined by
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