Mahesh Aggarwal

Application of Composite Materials in High Pressure Technology

In recent years, the application of composite materials for high pressure technology has been on the rise. The use of composites allows reducing the weight, improving shape optimization, promoting ease of handling, and also increasing the vessel’s mechanical, impact, and corrosion behavior. This paper provides an overview of the research work conducted in recent years on application of composite materials in design and development of pressure vessels. The research work on composite materials, especially on structural health monitoring and self-healing would contribute to a continued growth of the applications of composite pressure vessels.Copyright

A Theoretical and Computational Analysis of the Bolted Joint: A Sensitivity Study of Temperature Effect on the Turbocharger Inlet Bolted Joint in Locomotive Engines

The bolted joint is a very popular method of fastening together different components and one of the most important factors of machine design. Any mechanical failure of the bolted joint in rail industries can affect their financial, safety, and public confidence. In this paper, the primary objective was to create a bolted joint model to analyze the behavior of the turbocharger inlet bolted joint on a GE Transportation engine under room and working temperature. Theoretical and computational analyses investigations have been undertaken to determine the behavior of a turbocharger inlet bolted joint at room and working temperature based on VDI 2230 Part 1 and SR1+ program. Also, the reliability and validity of turbocharger inlet bolts were evaluated depending on their safety factors. A computational analysis has been performed for both structural and thermo structural loads that applied to the turbocharger inlet bolted joint.The results obtained show that the stresses on the bolted joint increased 25% at working temperature. Also, the strength of the bolted joint has a direct relationship with amount of tightening torque applied to the bolt while the position of the bolts has a major effect on the behavior of the bolted joint. In addition, the analysis showed that the turbocharger inlet bolted joint behaved differently depending on the loads type. The study also confirmed that the preliminary design had reduced margin at working temperature, and additional design modifications were required. It was determined that the loosening of the bolted joint and insufficient preload were the main reasons of failure.Copyright

Linear and Nonlinear Finite Element Analysis of an Exhaust Manifold With Included Bellows

The aim of this paper is to examine the utility of nonlinear analysis for structural response to thermal and mechanical loads, for a structure containing alternating regions of high and low stiffness as a result of inclusion of bellow sections. Utility is measured by comparison of results of linear and nonlinear analyses. The specific example used is that of an exhaust manifold for a large diesel engine. The paper discusses modeling of geometric and material nonlinearity, and makes recommendations in regard to which nonlinear effects are thought to be significant, based on the linear/nonlinear comparisons. The paper also contains general comments on the finite element modeling of structures containing bellows.Copyright