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. R3 E+ W( C' ?4 m* g2 z3 X% z( F提示：如果力控制法不能收敛，试用弧长法。9 E4 L# T2 C& Z1 q( e4 T, Z- l) T
F0 G0 u* K# J! t, Z# ITitle Snap-Through Buckling of a Hinged Shell
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# ?% U E' Y4 ]& w+ NOverview
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3 M& ?5 h: A7 j# n+ B$ v n| Reference: | C. C. Chang, “Periodically Restarted Quasi-Newton Updates in Constant Arc-Length Method”, Computers and Structures, Vol. 41 No. 5, 1991, pp. 963-972. | | Analysis Type(s): | Static Analysis |
: W Y6 I8 ^- MTest Case( A/ F' y. m/ X9 `+ Q
" t& Z( i c( X, Z8 UA hinged cylindrical shell is subjected to a vertical point load (P) at its center. Find the vertical displacement (UY) at points A and B for the load of 1000 N.$ [* t# Q1 H. c0 E
, U/ D8 r: `! HFigure 17.1 Hinged Shell Problem Sketch
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( ?+ q& C0 E+ W$ q3 || Material Properties | | E = 3.10275 kN/mm2 | | υ = 0.3 |
| | Geometric Properties | | R = 2540 m | | l= 254 m | | h = 6.35 m | | Θ = 0.1 rad |
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/ Y7 s, n; Z+ b% jAnalysis Assumptions and Modeling NotesDue to symmetry, only a quarter of the structure is analyzed. The structure exhibits the nonlinear postbuckling behavior under the applied load. Therefore, a large deflection analysis is performed using the arc length solution technique. The results are observed in POST26.! z: T/ `* q+ K- y& b
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Results Comparison | Target [1] | ANSYS | Ratio | | UY @ A, mm | -30.0 | -31.7 | 1.056 | | UY @ B, mm | -26.0 | -25.8 | 0.994 |
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- Target results are from graphical solution
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Figure 17.2 Deflection and Total Load Plot
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. Q" w# s1 I. A7 A[ 本帖最后由 tigerdak 于 2007-11-8 01:08 编辑 ] |
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发表于 2007-11-8 01:07:04