Finite Element Analysis 1D and 2D Elements
One-Dimensional Elements If only an axial and/or torsion load is to be transmitted in an element, then the CROD is the easiest element to use. A CBAR is easier to use than a CBEAM element. The I1 and/or I2 values can be set to zero. Use the CBEAM element instead of the CBAR element if any of the following features is important: The cross-sectional properties are tapered. The neutral axis and shear center do not coincide. The effect of cross-sectional warping on torsional stiffness is critical. The difference in the mass center of gravity and the shear center is significant. The formulation for the CBEAM element is based on a flexibility approach; the element stiffness matrix is generated by inverting the flexibility matrix. For this reason, I1 and I2 must not be zero for the CBEAM element. CBEAM3 elements favor a structure with initial curvatures and with high order shell elements. Two-Dimensional Elements In general, quadrilateral elements (CQUAD4 ...

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