Buckling Analysis of a Thin Plate
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1 Buckling Analysis of a Thin Plate
2 Outline 1 Description 2 Modeling approach 3 Finite Element Model 3.1 Units 3.2 Geometry definition 3.3 Properties 3.4 Boundary conditions 3.5 Loads 3.6 Meshing 4 Structural linear static analysis 4.1 Analysis commands 4.2 Results Total displacement DtXYZ 5 Structural stability 5.1 Analysis commands 5.2 Results Total displacement DtXYZ Appendix A Additional information Buckling Analysis of a Thin Plate 2/19
3 1 Description In this example, the buckling behavior of a thin square plate is analyzed. As shown in Figure 1, the plate is subjected to a uniform compression load f. t f b b = 2000 mm t = 10 mm E = 2x10 5 N/mm 2 ν = 0.3 b f Figure 1: Thin plate under uniform compression loading Beyond a certain load value f crit (i.e., the critical load) the plate becomes unstable and buckles. According to Timoshenko and Gere 1, the critical buckling load for this example is f crit = 4π2 D b 2 withd = Et 3 12 (1 ν 2 ), where b is the length of the plate, t the thickness, E the Young s modulus and ν the Poisson s ratio. With reference to Figure 1, for the present example we have f crit = N/mm. 1 S. Timoshenko and J. M. Gere, Theory of elastic stability, 2nd ed., McGraw Hill, 1963 Buckling Analysis of a Thin Plate 3/19
4 2 Modeling approach As both membrane stresses and bending stresses are of importance, shell elements are used. No use is made of symmetry conditions and thus the entire domain is subdivided in finite elements. A rather coarse mesh of 4x4 elements is used and quadratic square elements will be employed. The plate is supported in Z-direction along its edges. In-plane displacements in the mid-points of the edges are supported as shown in Figure 2. Y Z X Figure 2: Model used in the finite element analysis (the supports in the X, Y and Z directions are colored in red, green and blue, respectively) Note that in spite of the fact that the geometry of the structure is two-dimensional, we should perform a three-dimensional structural analysis. That is because the model shows a phenomenon in the third dimension (i.e., the out-of-plane displacement). Buckling Analysis of a Thin Plate 4/19
5 3 Finite Element Model For the modeling session we start a new project for structural analysis [Fig. 3]. The dimensions of the domain for the 3D model are set equal to 10 m. We will use quadratic quadrilateral finite elements. Main menu File New [Fig. 3] Figure 3: New project dialog Buckling Analysis of a Thin Plate 5/19
6 3.1 Units We choose millimeter for the unit Length, ton for Mass and Newton for Force. Geometry browser Reference system Units [Fig. 4] Property Panel [Fig. 5] Figure 4: Geometry browser Figure 5: Property Panel - Units Buckling Analysis of a Thin Plate 6/19
7 3.2 Geometry definition We create the plate sheet. The coordinates to be used for this geometry are in Table 1. Main Menu Geometry Create Add polygon sheet [Fig. 6] Viewer Viewpoints Top View plate Table 1: plate coordinates Figure 6: Add plate sheet Figure 7: View of the plate geometry Buckling Analysis of a Thin Plate 7/19
8 3.3 Properties We assign the element class and the material and geometrical properties to the plate. We use curved shell elements with a thickness of 10 mm as shown in Figure 1. The material is assumed isotropic linear elastic and the material properties presented in Section 1 are used. Main Menu Geometry Analysis Property assignments [Fig. 8] Property assignments Add new material [Fig. 9] [Fig. 10] Property assignments Add new geometry [Fig. 11] Figure 9: Add new material steel Figure 8: Property assignments to plate Figure 10: Edit material plate Figure 11: Edit geometry thickness Buckling Analysis of a Thin Plate 8/19
9 3.4 Boundary conditions We now apply the boundary conditions shown in Figure 2. We first constrain the displacement in the X-direction at the top and bottom mid-nodes, then the displacement in the Y -direction at the left and right mid-nodes and, finally, the displacement of the edges in the Z-direction. Main Menu Geometry Analysis Attach support (x3) [Fig. 12] [Fig. 15] Figure 12: Apply constraints in the X-direction Figure 13: Apply constraints in the Y -direction Figure 14: Apply constraints in the Z-direction Buckling Analysis of a Thin Plate 9/19
10 Figure 15: Geometric model with constraints Buckling Analysis of a Thin Plate 10/19
11 3.5 Loads We apply a vertical pressure to the plate by assigning a vertical distributed load at the top edge (-100 N/mm) and bottom edges (100 N/mm). Main menu Geometry Analysis Attach load [Fig. 16] [Fig. 18] Figure 16: Apply a vertical load at top edge Figure 17: Apply a vertical load at bottom edge Figure 18: Top view of the model with the vertical loads Buckling Analysis of a Thin Plate 11/19
12 Then, we need to create a load combination that considers the two vertical loads. This is needed during the setup of the buckling analysis as it will be considered as the buckling load. Main menu Loads Open geometry load combinations [Fig. 19] Figure 19: Load combination table Buckling Analysis of a Thin Plate 12/19
13 3.6 Meshing We set the mesh properties such that the elements size is 500 mm. Then, we generate the mesh. Main Menu Geometry Analysis Set mesh properties [Fig. 20] Main Menu Geometry Analysis Generate mesh [Fig. 21] Figure 20: Mesh properties Figure 21: Finite element mesh Buckling Analysis of a Thin Plate 13/19
14 4 Structural linear static analysis 4.1 Analysis commands We will first perform a linear elastic analysis for a quick assessment of the model. Main Menu Analysis New Analysis Analysis browser Right click ( ) Analysis1 Rename Linear [Fig. 22] Main Menu Analysis Run Analysis Figure 22: Analysis window Figure 23: Analysis tree Buckling Analysis of a Thin Plate 14/19
15 4.2 Results Total displacement DtXYZ Here, we will compare the vertical displacement of the top of the plate obtained numerically with and analytically from the equation: u y = fb 2Et = 0.05 mm. Results browser Output linear static analysis Nodal results Displacements DtY [Fig. 24] [Fig. 25] Figure 24: Results browser - DtY Figure 25: Displacement DtY As shown in Figure 25, the numerical result obtained with is the same as that from the analytical solution. Buckling Analysis of a Thin Plate 15/19
16 5 Structural stability 5.1 Analysis commands Now, we perform a structural stability analysis to derive the buckling load for the plate. Analysis browser Right click ( ) Linear Add command Structural stability [Fig. 26] [Fig. 27] Analysis browser Structural stability Eigenvalue analysis Right click ( ) Define stability analysis Edit properties [Fig. 28] Figure 26: Add command Figure 27: Analysis tree Figure 28: Buckling load Buckling Analysis of a Thin Plate 16/19
17 5.2 Results Total displacement DtXYZ We will create a contour plot of the total displacement of the buckled plate. Results window Case Mode 1, Buckling value Results browser Output eigenvalue analysis Nodal results Displacements DtXYZ [Fig. 29] [Fig. 30] Figure 29: Results browser - DtY Figure 30: Displacement DtXYZ As shown in Figure 30, the buckling load obtained from ( f = N/mm) is in good agreement with the theoretical value equal to N/mm calculated in Section 1. Buckling Analysis of a Thin Plate 17/19
18 Appendix A Additional information Folder: Tutorials/BucklingPlate Number of elements 16 Keywords: analys: dynami nonlin physic transi. constr: suppor. elemen: beam class1 class3 curved enhanc l12be l12bea l6tru q20sh rectan shell sp2tr spring t15sh truss. load: base time weight. materi: elasti engmas isotro orthot spring unload. option: direct linese newton regula units. post: tabula. pre: dianai. result: accele displa total. Buckling Analysis of a Thin Plate 18/19
19 DIANA FEA BV Delftechpark 19a 2628 XJ Delft The Netherlands T +31 (0) F +31 (0) DIANA FEA BV Vlamoven TN Arnhem The Netherlands T +31 (0) F +31 (0)
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