NDLI: Integrated force method for indeterminate structures

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Integrated force method for indeterminate structures

Content Provider	NASA Technical Reports Server (NTRS)
Author	Patnaik, Surya N. Hopkins, Dale A. Halford, Gary R.
Copyright Year	2008
Description	Two methods of solving indeterminate structural-mechanics problems have been developed as products of research on the theory of strain compatibility. In these methods, stresses are considered to be the primary unknowns (in contrast to strains and displacements being considered as the primary unknowns in some prior methods). One of these methods, denoted the integrated force method (IFM), makes it possible to compute stresses, strains, and displacements with high fidelity by use of modest finite-element models that entail relatively small amounts of computation. The other method, denoted the completed Beltrami Mitchell formulation (CBMF), enables direct determination of stresses in an elastic continuum with general boundary conditions, without the need to first calculate displacements as in traditional methods. The equilibrium equation, the compatibility condition, and the material law are the three fundamental concepts of the theory of structures. For almost 150 years, it has been commonly supposed that the theory is complete. However, until now, the understanding of the compatibility condition remained incomplete, and the compatibility condition was confused with the continuity condition. Furthermore, the compatibility condition as applied to structures in its previous incomplete form was inconsistent with the strain formulation in elasticity.
File Size	94150
Page Count	2
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_20090020471
Archival Resource Key	ark:/13960/t5cc6033f
Language	English
Publisher Date	2008-03-01
Access Restriction	Open
Subject Keyword	Man/system Technology And Life Support Finite Element Method Stress Analysis Computation Equilibrium Equations Boundary Conditions Elastic Properties Compatibility Displacement Structural Analysis Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Technical Report

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