Машиностроение

This paper introduces a new term namely fuzzy weighted-k-out-of-n system and studies the fuzzy reliability of two-stage fuzzy weighted-k-out-of-n model having common components following triangular membership function. Methods are developed to find the system fuzzy reliability and the minimal cuts and minimal paths for two-stage fuzzy weighted-k-out-of-n systems have been generated. Fuzzy reliability bounds for systems with s-dependent component failures are also generated. Two types of two-stage fuzzy weighted-k-out-of-n models, the Series Fuzzy Weighted (SFW)-k-out-of-n model, and the Parallel Fuzzy Weighted (PFW)-k-out-of-n model, have been applied to evaluate fuzzy reliability in network applications (project management, and the shortest path problems).

In this paper analytical solution using stress function is developed to determine deformations and stresses (radial and circumferential) made of functionally graded materials subjected to internal pressure. The problem is solved by varying Young’s modulus and density depending on the radial coordinate only, whereas the Poisson’s ratio is taken as constant. The purpose of this research is to find an analytical solution of a thin circular annular rotating disk. The pressure is applied at the internal surface of the disk and the results are compared with those available in literature.

The aim of this paper is to develop the fractional order implicit finite difference scheme for space fractional diffusion equation (SFDE) with mixed boundary conditions. We also prove that the scheme is unconditionally stable and convergent. As an application of this scheme numerical solution for space fractional diffusion equation is obtained with the help of Mathematica software.

Chain is the most important element of the industrial processes required for transmitting power and conveying of materials. As these chains operate under various forces, failure of chain assembly is the major problem. The scope of this paper is to study about uncertainties in heat treatments and effect of same on the stress strain curve and mechanical properties of chain link plates. Finally, experimentation is carried out on the chain assembly to study the failure of the chain. Furthermore, as lot of work has already been done in other components of chain, in this paper the focus has been narrowed down to Finite Element Analysis (FEA) of specific component like pin.