Applied Mechanics and Materials Vols. 592-594

Abstract: A356 alloys are attractive alternative for automotive and aeronautical applications. In this work the effects of T6 heat treatment in tribological properties of A356 alloy reinforced with Al₂O₃ nanoparticles of size 30nm are investigated. The percentage inclusions Al₂O₃ were varied from 0.5 to 1.5wt%. The particles were added with stirring at 400rpm and squeeze casting at 750⁰c and pressure of 600Mpa in the squeeze casting machine. The tribological properties of the samples were also investigated by pin-on-disk tests at 10,30,50and 70N, sliding speed 0.534m/s and sliding distance 1100m in dry condition. The lowest dry wear rate obtained through T6 heat treatment condition.

Abstract: I propose to design and test a steer-by-wire system will demonstrate that the physical connection between the steering wheel and the wheels of a car which can be eliminated in favor of a more robust system that allows for easy modifications. The system will mimic regular power steering and the driver will feel no difficulty in adjusting to the new system and yet will benefit from the many advantages of the system. Today’s automobiles benefit more and more from the vast applications of electronic systems. The integration of a steer-by-wire system can enhance these systems notably to a wide range. In particular, the handling and the safety of the cars can be improved significantly. Since a steer-by-wire system is easily modifiable, different drivers will be able to adjust the system to accommodate their styles and this will enhance easy handling. In addition, disabled people and the elderly will benefit immensely from steer-by-wire because they will be able to situate the steering wheel to meet special needs. Traction control systems are very closely tied with driving safety and they can be enhanced with steer-by-wire vastly [3]. For instance, if the car starts sliding and the driver loses control of the car, driven off the steering into the wrong side, the system could interfere and take over controls. Very sudden changes in steering could also be avoided with such a system. Since there are virtually no physical connections between the steering wheel and the wheels, a steer-by-wire system can be implemented on different cars easily. The steering wheel could be placed on either side of a car (or anywhere else). Both of these improvements would reduce costs of production and allow a wider range of designs eminently.

Abstract: The presence of thorough wall circumferential cracks has a detrimental effect on collapse load of elbows. The existing theoretical solutions do not correctly quantify the weakening effect due to the presence of the circumferential through wall crack in shape imperfect pipe bends. The present study has been done to investigate the effect of ovality and thinning on the collapse moment of 90° elbow with critical throughwall circumferential crack under in-plane bending moment using elastic-plastic finite element analysis considering large geometry change.

Abstract: This paper presents an analytical method to reduce the stress concentration in a functionally graded material (FGM) plate, having a circular cutout, under axial loading. An exponential radial variation and the variation by the power law, of the Young’s modulus is assumed here. This is achieved by decomposing the plate into a number of rings. Muskhelishivili’s method of the complex variable function is used for this piece of work study of stress distribution in the plate. It is observed that the stress concentration decreases as the Young’s modulus increases radially away from the hole.

Abstract: An experimental programme for determination of the Johnson Cook material and failure model constants for a typical armour steel material is reported. Tensile tests on specimens made from the armour material have been conducted at quasi-static and dynamic strain rates and at ambient and elevated temperatures. The analysis of the experimental data generates the model constants that are required as inputs during numerical simulation of dynamic events like armour impact using Johnson Cook constitutive relation and failure model implemented in most of the commercially available Finite Element codes.

Abstract: The selection of the optimum expansion joint depends on a technical as well as an economical aspect. The bellows is the basic element of expansion joints. The aim of this research is to perform a Finite Element Analysis (FEA) of metal bellows to investigate its static behavior and validate it with Expansion Joints Manufacturing Association (EJMA) standard. Further a parametric study is used to investigate the meridional stress component on the metal bellows at various temperatures. The result explains that the dimensions of convolution curvature are sensitive to its mechanical behavior. Also the component becomes flexible and peak stresses are reduced at elevated temperature.

Abstract: This study concerns the analysis of thermoelastic characteristics of non-uniform rotating disks subjected to thermal load including the effect of inertia force due to rotation of the disk. The solutions up to the elastic limit yield stress of the material are obtained under plane stress assumption by taking variation on total potential energy. The solution algorithm is implemented with the help of MATLAB computational simulation software. The analysis is carried out for various disk geometries and temperature distribution profiles. The effect of temperature on elasticity modulus is also investigated and some numerical results are presented and discussed in the form of limit angular speed under thermo-mechanical loading and reported in dimensionless form.

Abstract: This paper reports the design assessment carried out on a subassembly of an advanced rocket using experimental techniques. The design was very complex and critical, since a cylindrical shell had a square cutout on the axial-hoop plane interacting with a notch in the axial-radial plane. Herein, two optical techniques have been employed for assessing the interaction between the notch and the cutout, and their individual contributions to the strain-field. Initially, a photoelastic model was studied to estimate the stresses at the notch tip. Subsequently, DIC was employed for measuring strains at the notch during the ground based testing of the actual component. The outcomes of these two experiments showed that the effect of the cutout to the strain concentration was negligible due to the extra stiffness provided by other assemblies.

Abstract: This work deals with study, investigation, design and analysis structure of 5 stages axial flow gas turbine with AxSTREAM software suite. AxSTREAM turbomachinery suite, with few boundary conditions generating solutions precisely and very fast in preliminary design with ideal point. For that point including losses design the streamline flow path and converging results of CFD analysis and visualization the thermodynamic parameters. Stress and FEM analysis of a single stage and study of von mises stresses distribution. Static and vibration analysis of turbine blade with difference frequency and temperature. Natural frequency, rotor speed study with operating speed and vibration mode with Campbell diagram.

Abstract: Connecting rod is one of the most important components of an internal combustion engine and transfers motion from the piston to the crankshaft and function as a lever arm. Existing connecting rod is manufactured by using C-70 alloy steel. In the current study, connecting rod is replaced by E-glass/Epoxy composite material for universal tractor. The static strength of connecting rod is analyzed in detail and the maximum stress is found. Some improvement methods are also provided for the material selection of connecting rod. Connecting rod is modeled in CATIA V5 software and it is imported in ANSYS 14 workbench for analysis. The main objective of this study is to perform the static analysis of universal tractor connecting rod to find out its static strength using ANSYS 14 workbench. Finite element analysis is done by considering composite materials. The best combination of parameters like Von mises stress, deformation and weight reduction for connecting rod is carried out.