The Mechanical Behavior Analyses Of Porous Thermoplastic Polymer Composites Cylinder Under Multi-field Coupling

Composite materials are materials made from two or more constituent materials with different physical or chemical properties according to a certain proportion. Generally speaking, the thermoplastic polymer composites are made of two kinds of materials, such as fiber as reinforcement, resin as matrix. Different matrices can be combined into composite materials with different characteristics. Because of high specific mechanical properties, low density, good chemical resistance and good recycle ability and other good mechanical and physical properties, they have been widely used in aerospace, bio engineering, energy engineering, life and other areas. For thermoplastic polymer composites, the study of new reinforcements and matrices has been the way of researchers creating a new type of composite material. However, for thermoplastic polymer composites the study of the porosity is the easily neglected problem.In this paper, as the research of the porous thermoplastic polymer composites cylinder, assumed thermoplastic polymer composites is isotropic and the physical parameters changed with the porosity, based on the classical elastic theory, the dynamic response functions of the thermoplastic polymer composites cylinder under the thermomechanical coupling or hygrothermal coupling has been got. By means of the finite Hankel integral transform and Laplace transform, analytical solutions of dynamic equilibrium equation in the range of elasticity are obtained. By use of finite difference method and Newmark method, solutions of the dynamic equilibrium equation in the range of thermal viscoelasticity or hygrothermal coupling are obtained numerically. From the above methods, the dynamic responses on the porous thermoplastic polymer composites hollow cylinder is analyzed in the second chapter of this paper specifically and the influences of porosity on the vibration of displacements and stresses are obtained; the thermal viscoelastic dynamic behaviors of the porous thermoplastic polymer composites hollow cylinders is analyzed in the third chapter and the influences of porosity on the viscoelasticity of the thermoplastic polymer composites are got; the dynamic behaviors of the finite or infinite porous thermoplastic polymer composites hollow cylinders under hygrothermal coupling are researched in the fourth and fifth chapter and the influences of porosity on the hygrothermal conduction of the thermoplastic polymer composites are obtained. Except for the porosity, the influences of the mechanical loads, hygrothermal loads and thickness ratios to the mechanical properties of the composites are discussed respectively in this paper.This study work will enrich and develop the composite materials, structural dynamics and thermoelasticity. And the obtained results in this paper provide a theoretical basis for the manufacture of thermoplastic composite materials and further research, and have a certain practical value in engineering application.