Advanced search options

Advanced Search Options 🞨

Browse by author name (“Author name starts with…”).

Find ETDs with:

in
/  
in
/  
in
/  
in

Written in Published in Earliest date Latest date

Sorted by

Results per page:

Sorted by: relevance · author · university · dateNew search

You searched for +publisher:"Virginia Tech" +contributor:("Gürdal, Zafer"). Showing records 1 – 2 of 2 total matches.

Search Limiters

Last 2 Years | English Only

No search limiters apply to these results.

▼ Search Limiters


Virginia Tech

1. Madapur, Uma. Integrated structural analysis and design using 3-D finite elements.

Degree: MS, Aerospace and Ocean Engineering, 1988, Virginia Tech

When structural analysis is performed via iterative solution technique it is possible to integrate the analysis and design iterations in an integrated analysis and design procedure. The present work seeks to apply an integrated analysis and design approach due to Rizk to the problem of hole shape optimization in thick plates. The plates are modeled by three dimensional eight noded elements. An element by element (EBE) preconditioned conjugate gradient (PCG) method is used for the structural analysis, because this method is well suited for poorly banded three dimensional problems. The plates were optimized so as to minimize the stress concentration near the hole measured by the ratio of the Von Mises stress to the applied boundary stress. The analysis program was validated by comparision to a commercial finite-element program as well as photoelastically obtained stress concentrations. Similarly, the optinlization procedure was checked against plates optimized by a photoelastic technique. Good agreement was observed. The integrated analysis and design approach tested here is based on partially converged solutions of the EBE-PCG iterative process. A study of the effect of the number of iterations on analysis and derivative accuracy was performed. Based on this analysis a choice was made for the number of iterations to be used in the integrated analysis and design procedure. It was found that the cost of the design could be significantly reduced with only minimal effects on the final shape and stress concentration factor. Advisors/Committee Members: Haftka, Raphael T. (committeechair), Kapania, Rabesh K. (committee member), Gürdal, Zafer (committee member).

Subjects/Keywords: Structural analysis (Engineering); LD5655.V855 1988.M323

Record DetailsSimilar RecordsGoogle PlusoneFacebookTwitterCiteULikeMendeleyreddit

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Madapur, U. (1988). Integrated structural analysis and design using 3-D finite elements. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/43407

Chicago Manual of Style (16th Edition):

Madapur, Uma. “Integrated structural analysis and design using 3-D finite elements.” 1988. Masters Thesis, Virginia Tech. Accessed August 14, 2020. http://hdl.handle.net/10919/43407.

MLA Handbook (7th Edition):

Madapur, Uma. “Integrated structural analysis and design using 3-D finite elements.” 1988. Web. 14 Aug 2020.

Vancouver:

Madapur U. Integrated structural analysis and design using 3-D finite elements. [Internet] [Masters thesis]. Virginia Tech; 1988. [cited 2020 Aug 14]. Available from: http://hdl.handle.net/10919/43407.

Council of Science Editors:

Madapur U. Integrated structural analysis and design using 3-D finite elements. [Masters Thesis]. Virginia Tech; 1988. Available from: http://hdl.handle.net/10919/43407


Virginia Tech

2. Lombardi, Marco. Optimization of composite carriage for a coordinate measurement machine.

Degree: MS, Aerospace and Ocean Engineering, 1994, Virginia Tech

The growing need for high quality and reliability of products requires the control of the accuracy of dimensions and shape of product components. Coordinate Measurement Machines (CMM) are now able to measure the dimensions and/or the shape of objects with submicron precision. The desire for high-speed measurement, has stimulated the interest of CMM manufacturers in the use of composite materials for the structure of their machines. Composites are lighter than conventional materials, and are generally less affected by temperature changes. In cooperation with one of the major European CMM manufacturers, the problem of redesigning a steel carriage of a CMM, from composite materials component is considered. A simple strength-of-materials based calculation is used to design a prototype of the carriage, which is built and mounted on the machine to be tested. A NASTRAN finite element model of the composite component is created to analyze more accurately the behavior of the composite structure. Structural optimization is next performed to seek minimum weight and maximum stiffness designs of the structural component. Advisors/Committee Members: Haftka, Raphael T. (committeechair), Kapania, Rabesh K. (committee member), Gürdal, Zafer (committee member).

Subjects/Keywords: Coordinate measuring machines; LD5655.V855 1994.L663

Record DetailsSimilar RecordsGoogle PlusoneFacebookTwitterCiteULikeMendeleyreddit

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Lombardi, M. (1994). Optimization of composite carriage for a coordinate measurement machine. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/43116

Chicago Manual of Style (16th Edition):

Lombardi, Marco. “Optimization of composite carriage for a coordinate measurement machine.” 1994. Masters Thesis, Virginia Tech. Accessed August 14, 2020. http://hdl.handle.net/10919/43116.

MLA Handbook (7th Edition):

Lombardi, Marco. “Optimization of composite carriage for a coordinate measurement machine.” 1994. Web. 14 Aug 2020.

Vancouver:

Lombardi M. Optimization of composite carriage for a coordinate measurement machine. [Internet] [Masters thesis]. Virginia Tech; 1994. [cited 2020 Aug 14]. Available from: http://hdl.handle.net/10919/43116.

Council of Science Editors:

Lombardi M. Optimization of composite carriage for a coordinate measurement machine. [Masters Thesis]. Virginia Tech; 1994. Available from: http://hdl.handle.net/10919/43116

.