Loading...
Search for:
darijani--h
0.005 seconds
Evaluation of the optimum pre-stressing pressure and wall thickness determination of thick-walled spherical vessels under internal pressure
, Article Journal of the Franklin Institute ; Volume 344, Issue 5 , 2007 , Pages 439-451 ; 00160032 (ISSN) ; Darijani, H ; Naghdabadi, R ; Sharif University of Technology
2007
Abstract
In the present study, in the first part for a spherical vessel with known dimensions and working pressure, two methods of hoop and equivalent stress optimization across the wall thickness are employed to determine the best autofrettage pressure. In the next part for a predefined working pressure the minimum wall thickness of the vessel is calculated using two other design criteria i.e. (A) optimizing the hoop stress, and (B) assuming a suitable percent for the penetration of yielding within the wall thickness. Finally, the optimum thickness and the necessary strengthening pressure are extracted and different plots are introduced for different types of structural materials under different...
Engineering development of an instrument panel concept using a unified FE modeling approach
, Article 8th Biennial ASME Conference on Engineering Systems Design and Analysis, ESDA2006, Torino, 4 July 2006 through 7 July 2006 ; Volume 2006 , 2006 ; 0791837793 (ISBN); 9780791837795 (ISBN) ; Darijani, H ; Shamsaei, N ; Naghdabadi, R ; Sharif University of Technology
2006
Abstract
In today's global economy, the automotive design engineer's responsibilities are made more complex by the differences between regulatory requirements of the various global markets. This paper compares instrument panel head impact requirements of FMVSS 201 with its European counterparts, ECE 21. The behavior during a head impact test has been studied. Due to the gravity of the cockpit module, the sag has been analyzed to simulate shipping, loading, and assembly conditions. The interior parts of the vehicle cabin are exposed to temperature variations due to radiation effect of sun ray or freezing temperature in winter. Plastic parts appear to be more thermally susceptible than steel parts in...
Wall thickness optimization of thick-walled spherical vessel using thermo-elasto-plastic concept
, Article International Journal of Pressure Vessels and Piping ; Volume 82, Issue 5 , 2005 , Pages 379-385 ; 03080161 (ISSN) ; Rezai Zarei, A ; Darijani, H ; Sharif University of Technology
2005
Abstract
A study of thick-walled spherical vessels under steady-state radial temperature gradients using elasto-plastic analysis is reported. By considering a maximum plastic radius and using the thermal autofrettage method for the strengthening mechanism, the optimum wall thickness of the vessel for a given temperature gradient across the vessel is obtained. Finally, in the case of thermal loading on a vessel, the effect of convective heat transfer on the optimum thickness is considered, and a general formula for the optimum thickness and design graphs for several different cases are presented. © 2004 Elsevier Ltd. All rights reserved