Are there any examples of a built-up beam section with multiple materials?
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Below is an example showing how to create a built-up beam with multiple materials. For this example, material 1 has a different alpha (coefficient of thermal expansion) than material 2. When subjected to a temperature difference this "bimetallic strip" will deform due to the alpha difference. !****************************************** !***First create the built-up cross-section !****************************************** fini /clear /prep7 k,1,0,0,0 !define keypoints k,2,0,1,0 k,3,1,1,0 k,4,1,0,0 k,5,0,2,0 k,6,1,2,0 a,1,2,3,4 !create areas from keypoints a,2,5,6,3 et,1,mesh200 !use "not-solved" MESH200 element keyo,1,1,7 !8node quad option mat,1 !lower 1/2 of cross-section is material #1 amesh,1 !mesh area #1 with material #1 mat,2 !upper 1/2 of cross-section is material #2 amesh,2 !mesh area #2 with material #2 secwrite,mysec,sect !Write cross-section definition to mysec.sect file !*********************************************************************************** !***Start new ANSYS Session, read in the section information, apply loads, and solve !*********************************************************************************** fini /clear /prep7 et,1,beam188 !Using BEAM188 n,1,0,0 !Define nodes n,2,5,0 n,3,10,0 n,4,15,0 n,5,20,0 n,6,25,0 n,1000,0,1,0 !Orientation node e,1,2,1000 !Create 5 elements from nodes e,2,3,1000 e,3,4,1000 e,4,5,1000 e,5,6,1000 mp,ex,1,30e6 !Create 2 materials with different alphas mp,alpx,1,2e-5 !Material 1 alpha = 2e-5 mp,ex,2,30e6 mp,alpx,2,1e-5 !Material 1 alpha = 1e-5 sectype,1,beam,mesh, !User-defined mesh for section ID #1 secread,'mysec','sect',' ',mesh !Read section info from mysec.sect file /solu d,1,all,all !fix one end tref,0 !Reference temperature = 0 tunif,1000 !Final uniform temperature = 1000 solve /post1 /dscale,1,1 !True displacement scaling /eshape,1 !Show beam shape /view,1,1,1,1 !Isometric view pldisp,2 !Plot deformed shape and undeformed edge /wait,2 plns,u,y !Plot y displacement /eof Notes: BEAM188/BEAM189 allow for the analysis of built-up beams, (i.e., those fabricated of two or more pieces of material joined together to form a single, solid beam). The pieces are assumed to be perfectly bonded together. Therefore, the beam behaves as a single member. The multi-material cross-section capability is applicable only where the assumptions of a beam behavior (Timoshenko or Bernoulli-Euler beam theory) holds. In other words, what is supported is a simple extension of a conventional Timoshenko beam theory. It may be used in applications such as: *bimetallic strips *beams with metallic reinforcement *sensors where layers of a different material has been deposited |
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