Download A Unified Approach to the Finite Element Method and Error by Julian A. T. Dow PDF

By Julian A. T. Dow

This ebook presents an in-depth history to raised realizing of finite point effects and methods for making improvements to accuracy of finite point tools. therefore, the reader is ready to establish and cast off error contained in finite aspect types. 3 various errors research innovations are systematically constructed from a standard theoretical origin: 1) modeling erros in person parts; 2) discretization error within the total version; three) point-wise blunders within the ultimate pressure or pressure results.Thoroughly type demonstrated with undergraduate and graduate scholars. A Unified method of the Finite point process and blunder research methods is bound to turn into a vital source for college students in addition to practising engineers and researchers. * New, easier aspect formula concepts, model-independent effects, and blunder measures* New polynomial-based tools for deciding on severe issues* New systems for comparing sheer/strain accuracy* available to undergraduates, insightful to researchers, and worthy to practitioners* Taylor sequence (polynomial) established* Intuitive elemental and point-wise blunders measures* crucial history info supplied in 12 appendices

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Extra info for A Unified Approach to the Finite Element Method and Error Analysis Procedures

Example text

When the functional for a particular problem is substituted into these equations, the differential equations and the boundary conditions that the minimizing function must satisfy for this problem are produced. For the case of a potential energy functional, the equilibrium equations result from this process. The key element in the procedures of variational calculus revolves around the introduction of a variation or imaginary perturbation into the functional. A variation is typically called a virtual displacement in mechanics.

The principles of variational calculus are used here to identify the conditions that must hold if a functional is to be minimized. We show that minimization is accomplished when the Euler-Lagrange equations and the boundary terms are forced to zero. The process of satisfying these conditions produces the governing differential equations and boundary conditions for a problem. In the case of the elasticity problems studied, the resulting governing differential equations are equilibrium equations.

Then form the potential energy function and find the equilibrium equations. X1 X2 X3 i=- i=- i=- I- A1 X4 i 2 4. Form the potential energy function for the continuous bar of Example 2 if the distributed load due to gravity is replaced by a point load applied to the free end. Hint: This problem is designed to introduce a nonzero natural boundary condition. 5. Form the potential energy function for the problem of Example 2 if the free end of the bar is restrained in the same manner as the other end.

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