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Solid Mechanics — General modeling of objects with extension in all directions
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Shell and Plate — For objects which are thin in one direction, but have significant bending stiffness
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Membrane — For objects which are thin in one direction, and have negligible bending stiffness
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Beam — For objects where two directions have significantly smaller dimensions than the third; significant bending stiffness
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Truss — For objects where two directions have significantly smaller dimensions than the third; only axial forces can be transmitted
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