Mechanical properties of metal and polymeric viscoelastic materials and their applications

Nowadays, With the wide application of metals and polymeric materials, how to describe the property of Viscoelastic material and how to apply them in engineering has become more and more critical. Due to the lack of insight into the mechanical properties of viscoelastic materials, many scholars have done a lot of experiments in studying the behavior of viscoelastic materials. Axial tensile tests were conducted on specimens to derive different mechanical behaviors of metals, polymers, and other materials at different temperatures and loading rates. Metal can generally be divided into elastic and plastic parts, while polymeric materials have the phases of the linear elastic region, drawing region, and oriented molecular strength region. This paper also shows a test conducted by Argon, Ali S., and M. I. Bessonov of four different kinds of polymers at different circumstances of temperature. After that, the paper shows the application of viscoelastic materials as CLD in damping and some engineering problems caused by the mechanical properties of viscoelastic materials. Currently, research on viscoelasticity should mainly focus on the application of Finite Element Methods and the acquisition of more experimental data to establish a complete theoretical system.

Pressurized Interfacial Failure of Soft Adhesives

Interfacial separation of soft, often viscoelastic, materials typically cause the onset of instabilities, such as cavitation and fingering. These instabilities complicate the pathways for interfacial separation, and hence hinder the...

Nonlinear Models of Thermo-Viscoelastic Materials

The paper develops a general scheme for viscoelastic materials, where the constitutive properties are described by means of measures of strain, stress, heat flux, and their time derivatives. The constitutive functions are required to be consistent with the second law of thermodynamics. Indeed, a new view is associated with the second law: the non-negative expression of the entropy production is set equal to a further constitutive function. The introduction of the entropy production as a constitutive function allows for a much wider range of models. Within this range, a scheme to obtain nonlinear models of thermo-viscoelastic materials subject to large deformations is established. Notably, the Kelvin–Voigt, Maxwell, Burgers, and Oldroyd-B viscoelastic models, along with the Maxwell–Cattaneo heat conduction, are obtained as special cases. The scheme allows also for modelling the visco-plastic materials, such as the Prandtl–Reuss work-hardening function and the Bingham–Norton fluid.

Asphalt mixture and its time delay of stress after strain at change of temperature and frequency

Materials in pavement construction are used due to their material properties. Asphalt mixtures, which are today most used during building pavement construction, have a significant place. Asphalt mixtures are classified as viscoelastic materials due to their material properties. This article focuses on the time delay of the stress behind the strain, which is a specific property for viscoelastic materials. It is particularly focused on one type of asphalt mixture, which is used in the binder course and in the upper base layer. The selected asphalt mixture was tested on a four-bending machine and the samples had a beam shape. The sample was tested at four temperatures and seven frequencies. In the discussion, the article focuses on the comparison of the time delay of the stress Δt behind the strain during the change of temperature and frequency. It is clear from the results that the selected asphalt mixture is significantly affected by the change in temperature as well as the change in frequency. The conclusion is devoted to a summary of the acquired knowledge and observation, which is focused on examples in practice.

Application of Viscoelastic Materials in Ship Collision

With the expansion of global trade routes, ship collision has become a major problem. This article proposes an approach by laying viscoelastic material on the inner side of the ship to increase the crashworthiness. By using the nonlinear finite element model software, this study simulates ship collisions as well as models and analyzes ships along with viscoelastic materials. The results from the simulation suggest that viscoelastic materials can effectively protect ships during collisions.