Thermo-elastoplastic behavior of a rotating sandwich disc made of temperature-dependent functionally graded materials

Abstract

In this paper, the thermo-elastoplastic behaviors of rotating sandwich nonuniform thickness annular discs made of functionally graded materials are evaluated using the numerical finite difference method. The sandwich disc is composed of number of equal width layers, and each layer has its own volume fraction. The temperature dependency of the constituent materials is considered; hence, the thermomechanical properties are functions of both position and temperature. The plasticity analysis is accomplished based on the modified Tamura-Tomota-Ozawa model and von Mises yielding criterion. The effects of angular speed, number of layers, thickness profile, and boundary conditions on the stresses and displacements are investigated. Since failure may occur at the interface between the successive layers, the circumferential stress-jumps at the interfaces are also considered. Results ascertain that the temperature dependency of the properties highly influences the disc behaviors. In addition, better disc performance is obtained by increasing the number of layers and/or decreasing the angular speed.

Thermoelastic stress mitigation and weight reduction of functionally graded multilayer nonuniform thickness disc

“…In such case, V changes in a step-wise manner (equation (4)) leading to a constant property mismatch between the layers. 2,7…”

“…[5][6][7] Also, some research was conducted on multilayer discs (or cylinders). 2,[7][8][9][10][11] In addition, the dynamic performance was considered in many studies. [12][13][14] Furthermore, numerous researchers referred to the stark impacts of the materials' temperature dependency on the performance.…”

“…); rotating discs have drawn the attention of researchers to investigate their behaviors. 1 Many articles were devoted to estimating the elastic, 1,2 thermoelastic, 3,4 and elastoplastic static behaviors. 5–7 Also, some research was conducted on multilayer discs (or cylinders).…”

“…failure). 2 Therefore, multilayer (sandwich) structures are gaining remarkable attention. Nevertheless, such configuration promotes occurrence of stress-jumps that are extremely detrimental if not priorly considered.…”

A numerical solution to thermo‐mechanical behavior of temperature dependent rotating functionally graded annulus disks

“…In Eldeeb et al (2020), studied thermo-elastic behavior of sandwich disk based on modified Tamura–Tomota–Ozawa model, the temperature-dependent properties considered has a drastic effect on the results of radial stress, circumferential stress and circumferential stress jump at the layer interface. Also, temperature dependency material property significantly affects elasto-plastic stress distribution; stresses are smaller in variable thickness disk than uniform thickness disk; in contrast to uniform thickness disk where the location of yield is at the root, in plasticity yielding can occur at any point (Mahdavi et al , 2016).…”