The Research Progress of Mechanical Properties of Composite Laminates

Composite material is composed of two or more kinds of materials through a certain way together, it has the excellent performance of a single material, but also take into account the comprehensive performance of a variety of materials composite, all kinds of materials complement each other, produce synergistic effect, so composite material due to its advantages of composite application in all walks of life. In this paper, the latest research emphases on composite laminates in recent years are described according to the time sequence. It mainly includes: Research progress of piezoelectric composites [1-3], Theory of high order shear deformation of composite laminates [4-6], Response of composite laminates under external loads (periodic vibration, shock, subsonic compressive airflow) [7-11], The response of composite laminates with heat input [12-15], The influence of viscoelastic damping on composite laminates [16-18]. And so, on aspect carries on the elaboration.

Literature [1-3] respectively studied the new idea of establishing piezoelectric composite laminated plates by using the variable kinematics plate modeling method, proposed the extension of iso-geometric method to study the dynamic response of CNTRC plates, and proposed a four-variable fine plate theory for the bending analysis of piezoelectric fiber reinforced composites. In this kind of research, by using the idea of variable kinematics modeling, the isopach distribution of positioning and moving field and electric potential is adopted to obtain the two-dimensional plate equation. The dynamic response of the piezoelectric carbon nanotubes reinforced materials is studied by using the geometric method, and the linear function of the laminates is obtained. This method has high reliability. In the analysis of improving the bending of piezoelectric fiber, the application of four-variable refinement theory combined with MATLAB for numerical solution also has a higher solution.

Literature [4-6] mainly optimizes the theory of high-order shear deformation of composite laminated plates. It includes putting forward a new theory of laminated CO -type high order shear deformation, which is applied to laminated composite interlayer, so that the plane displacement and transverse shear stress within the layer have a high continuity. The static, buckling and free vibration directions of composite are studied by using the improved shear theory. The constitutive relation is established by finite volume discretization and so on. Literature [7-11] studies the response of composite materials under ballistic impact, periodic load and subsonic airflow load. In ballistic impact, the response and residual energy relation of different impact regions are studied. The response problem with small diameter and high-speed impact has a great research prospect. The vibration parameters of conical laminated plates under cyclic fatigue load are set, and the results show that the conical structure has better fatigue resistance than the plate structure under rotational load. The stability and vibration characteristics of the laminated plate are taken into account by the fluid model, and the threshold value of plate instability is obtained.

Literature [12-15] mainly studies laminated plate theory of composite materials and heat-buckling behavior under heat exchange. In the study of thermal-buckling mechanical response of inclined functionally gradient materials with initial defects, the CO-type shear deformation theory mentioned above is used to derive the governing differential equation based on the variational principle, which is widely used in this kind of research. In the study of various plate theories, the theoretical formulas of composite laminated plates and sandwich plates under thermal loading are given, which are verified by pushing down and experiment and have high accuracy, which provides a theoretical basis for the study of composite response under thermal loading in the future. In addition, the effect of stratification on the composite shell in the hot and humid environment is also discussed. The stratification effect under the influence of temperature and humidity in the external environment is given by combining the experimental operation and theory.

Literature [16-18] studied the progressive analysis of adding viscous damping to the laminated plate and the viscoelastic analysis of the laminated plate as a whole. The viscous damping is filled into the laminated plate, and it is concluded that this kind of large structure dissipative material as viscous material has a good application prospect when the laminated plate is subjected to low-frequency load. The first order shear deformation theory is improved to improve the viscoelastic responsiveness of laminated plates. Compared with other literatures, this kind of theory has high accuracy.

Through the research and analysis of composite laminated plates in recent years, the conclusions are as follows:

The dynamic response and bending analysis of piezoelectric fibers are studied by optimization modeling and new geometric methods. In general, the current theoretical development and mechanical analysis of piezoelectric fiber is not very perfect, which will be the main direction of composite material research in the response of composite laminates under impact load, relatively complete studies have been conducted on low speed and low energy, while few studies have been conducted on extreme conditions (fatigue, subsonic). If composite materials are widely used, such studies will also be a hot topic in the research on the response of composite laminates with heat exchange, viscous damping and viscoelasticity, the main research direction at present is theory and experiment, which can be further analyzed by finite element simulation, which is also a research direction research on the dynamic response of composite laminated plates in the direction of vibration and buckling is a kind of direction for future research, and there are few references available, which can be expanded in these aspects.

This work was supported by the National Nature Science Foundation of China [grant numbers 11602160,11402160,21501129]; the Scientific and Technological Innovation Programs of Higher Education Institutions in Shanxi [grant number 2017117]; and the opening foundation for state key laboratory for strength and vibration of mechanical structures [grant number SV2017-KF-01, SV2019-KF-01]; and the “1331project” Key Innovation Teams of Shanxi Province..

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