The automatic time stepping procedure autotson is

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Unformatted text preview: ne end and has a gap δ between its other end and a rigid wall when at ambient temperature Ta. Calculate the stress σ, and the thermal strain εThermal in the bar after it has been heated to temperature T. Figure 27.1 Gap Problem Sketch Material Properties E = 10.5 x 106 psi α = 12.5 x 10-6 in/in-°F Geometric Properties = 3 in δ = 0.002 in Loading Ta = 70°F T = 170°F Analysis Assumptions and Modeling Notes The problem is solved first in 2-D using LINK1 and CONTAC12 elements, then in 3-D using LINK8 and CONTAC52 elements. Models are created at arbitrary angles. The gap stiffness is arbitrarily selected at a high value (10 x 1010 psi) to approximate the rigid wall. The automatic load stepping procedure (AUTOTS,ON) is used. ANSYS Verification Manual . ANSYS Release 9.0 . 002114 . © SAS IP, Inc. 1–69 VM27 Results Comparison Target 2-D Analysis Stress, psi StrainThermal 3-D Analysis Stress, psi StrainThermal 1–70 ANSYS Ratio -6125. -6125. 1.000 0.00125 0.00125 1.000 -6125. -6125. 1.000...
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