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MECH300H Introduction to Finite Element Methods Lecture 9 Finite Element Analysis of 2-D Problems – Axi- symmetric Problems
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Axi-symmetric Problems Definition: A problem in which geometry, loadings, boundary conditions and materials are symmetric about one axis. Examples:
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Axi-symmetric Analysis Cylindrical coordinates: quantities depend on r and z only 3-D problem 2-D problem
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Axi-symmetric Analysis
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Axi-symmetric Analysis – Single-Variable Problem Weak form: where
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Finite Element Model – Single-Variable Problem Ritz method: where Weak form where
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Single-Variable Problem – Heat Transfer Heat Transfer: Weak form where
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3-Node Axi-symmetric Element 1 2 3
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4-Node Axi-symmetric Element 1 2 3 4 a b r z
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Single-Variable Problem – Example Step 1: Discretization Step 2: Element equation
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