University of Utah（犹他大学）.pdf

University of Utah ME EN 6510/5510 Introduction to Finite Elements Fall 2005 Beam Elements snip (from ANSYS Manual) 4.3 BEAM3 2-D Elastic Beam BEAM3 is a uniaxial element with tension, compression, and bending capabilities. The element has three degrees of freedom at each node: translations in the nodal x and y directions and rotation about the nodal z-axis. See Section 14.3 of the ANSYS Theory Reference for more details about this element. Other 2-D beam elements are the plastic beam (BEAM23) and the tapered unsymmetric beam (BEAM54). Figure 4.3-1 BEAM3 2-D Elastic Beam 4.3. 1 Table 4.3-1 BEAM3 Input Summary Element Name BEAM3 Nodes I, J Degrees of Freedom UX, UY, ROTZ Real Constants AREA, IZZ, HEIGHT, SHEARZ, ISTRN, ADDMAS Material Properties EX, ALPX, DENS, GXY, DAMP 4.3.3 Assumptions and Restrictions The beam element can have any cross-sectional shape for which the moment of inertia can be computed. However, the stresses are determined as if the distance from the neutral axis to the extreme fiber is one-half of the height. The element height is used only in the bending and thermal stress calculations. The applied thermal gradient is assumed linear across the height and along the length. The beam element must lie in an X-Y plane and must not have a zero length or area. The moment of inertia may be zero if large deflections are not used. end of snip Beam Elements - A simple cantilever beam problem with 2 different materials and section properties will be analyze