THICK-WALLED COMPOSITE TUBES UNDER MECHANICAL AND HYGROTHERMAL LOADING

The stresses in long thick-walled composite tubes were determined analytically for loading by internal and external pressure, longitudinal forces and twisting moments. Effects of thermal and hygrothermal expansion were also treated. The solution is restricted to tubes built up from one or more layers with macroscopically orthotropic properties. Such layers may be produced, for example, by filament winding or winding of textile reinforcements. It was shown how the elastic and hygrothermal parameters of the macroscopically orthotropic materials may be calculated by homogenization of the properties of uniaxially reinforced materials.