Configuration of Optimal Cross Bore Shape in Elastic Pressurized High Pressure Vessels
Journal Title: International Journal of Mechanical and Production Engineering Research and Development (IJMPERD ) - Year 2019, Vol 9, Issue 5
Abstract
Numerous analyses were performed to establish the optimal shape between circular and elliptical plain cross bore at both radial and offset positions in closed thick walled cylinders. Seven cross bored cylinders with thickness ratios between 1.4 and 3.0 were studied. For effective comparison between circular and elliptical cross bores, the major radius of the elliptical cross bore was equal to that of circular cross bore. The behaviour of hoop stresses together with that of Stress Concentration Factors (SCF) were investigated at offset location ratios ranging from 0 to 0.9 using a three dimensional linear finite element analysis. Elliptical shaped cross bore predicted lower hoop stresses at radial position than circular ones, with a variation of 44.6% to 66.9% across the studied thickness ratios. With exception of K= 2.25, circular cross bores predicted lower hoops tress at 0.9 offset location ratio than elliptical ones. The minimum SCF magnitude due to circular cross bore occurred at 0.9 offset position in K=1.4, with a magnitude of 2.312. On the other hand, the lowest SCF magnitude produced by elliptical cross bore occurred at radial position with magnitude of 1.733 at thickness ratio of 2.5. This magnitude predicted by the elliptical cross bore also doubled as the overall optimum SCF in this study. For a circular cross bore, coincidence in SCF between the optimum thickness and location occurred in K=1.4 at the 0.9 offset position which also gave the best circular shape. Whereas for an elliptical shape, similar coincidence in SCF occurred respectively in K=1.75 and 2.5 at 0.685 and 0 offset positions. In conclusion, optimal location of elliptical cross bores reduce SCF magnitudes by 33% in comparison to a similar circular cross bore. However, an incorrect positioning of the same cross bore may lead to a rise of SCF magnitude by 121%.
Authors and Affiliations
P. K. Nziu, L. M Masu
Keywords
Related Articles
- EP ID EP671645
- DOI 10.24247/ijmperdoct201918
- Views 87
- Downloads 0
A Review on Non-Circular Journal Bearings
Hydrodynamic bearings depend on the high journal speed to move the pressurized fluid in a wedge between the faces. Instabilities due to oil whip and whirl are usually observed when using hydrodynamic circular journal bea...
Hydraulic Electronic Unit Injector (HEUI) Testing Bench
This paper presents a suggested injector test bench construction, and also testing of its performance and application, because there is no device for testing the workability for this kind of injectors. Also, service deal...
A Multi-Manned Parallel Two-Sided Assembly Line Balancing with Tool Sharing Approach- A Company Case Study Solved by Exact Solution Approach
Purpose- The main aim of this paper is to develop a new mathematical model for the multi-manned parallel two-sided assembly line balancing problem (MPTALBP) generally occur in plants producing large-sized high-volume pro...
ANALYSIS OF PERFORMANCE AND POLLUTANT CHARACTERISTICS OF CI ENGINE USING THE MIXTURE OF DIESEL AND EUCALYPTUS OIL
The present fossil fuel crunch and increasing vehicle numbers made us think of alternative fuels. The abundance of the fossil fuels is expected to be exhaust in another 20-30 years. The cost of the fossil fuels is day by...
Comparative Study of Soil Fertility Based on SFM Computational Model for IB-INW and IC-HAPI Zone
In agriculture, soil is a critical component. This study compares the fertilization status of IC-HAPI zone with neighbouring IB-INW zone in agricultural land and waste land categories. IB-INW zone and IC-HAPI zone locate...