ANSYS结构非线性分析指南 17、选择“ Main Menu>TimeHist Postpro> Math Operations>Add”。出现“ Add time- History ariables”对话框 18、输入“ reference number for: result”为5,“ Ist variable”为3,而“2 nd variable” 为4,按“0K”。这将把弹性和塑性应变添加到边量3和4。其总和是总应变,并存为变量5。 步骤十七:显示时间-历程结果 1、选择“ Main Menu>TimeHist Postpro)Settings> Graph”。出现“ Graph Settings”对话框。 2、按“ Single variable for the X- axis variable”,并输入5。 选择“ Utility Menu> PlotCtrlsstvle> Graphs> Modify Axes"”。 “ Axes modifications for Graph Plots”对话框。 4、在“X- axis label”中,输入“ Total y- Strain 5、在“Y- axis label”中,输入“Y- Stress”。按“OK 6、选择“ Main Menu >TimeHist Postpro> Graph Variables”。出现“ Graph Time-History Variables”对话框 、在第一个要显示的变量中输入“2”,按“OK 步骤十八:退出 ANSYS 从工具条中选择“QUIT” 2、选择所需要的选项,最后按“OK”。 2.5.1.4求解步骤(批处理方法) 用户可以用下面显示的 ANSYS命令替代GUI选择来进行§2513的非线性静态实例分析。以感叹 号(!)开头的条目是注释。 /BATCH,list /title, Cyclic loading of a fixed circular plate /finnan, ax /prep Radius of the plate(m) thick=0. Thickness of plate(m) et 1. PLANE42.1 PLANE42 axisymmetric element mp,ex,1,l691.23 mp, nuxy, 1, 0.3 Define a Kinematic hardening Plasticity curve using the KINd material model tb, KINH, 1, 1. 5 I Define the true stress vs. total log strain curve for this material model using 5 points. First point detines the elastic limit tbpt,0.001123514,19.00 tbpt,0.001865643,2280 pt,0.002562402,25.08 tbpt,0.004471788,29.07 tbpt,0.006422389,31.73
ANSYS结构非线性分析指南 Set the axles labels for the stress-strain curve plot /axlab, X, Log Strain(N/m/2) /axlab, Y, True Stress(N/m/2) tbp, KINH, I Plot and verify the material stress-strain curve Define a rectangle which is the axisymmetric cross section of the plate The rectangle has a length equal to the radius of the plate and a height equal to the thickness of the plate rect, radius, thick Select the left and right bounding lines of the created rectangle and set I the line division to 8 (8 elements through the thickness of the plate) FLST. 5. 2.4,ORDE, 2 FITEM.5.2 FITEM.5.4 CM. YLINE LSEL,,,, P51X CM, YlLINE CMSEL,, Y LESIZE,Y1,,,8,1, CMDEL, YI Select the top and bottom bounding lines of the created rectangle and set the line division to 40 (40 elements through the radius of the plate FLST. 5. 2, 4,ORDE,2 FITEM 5,1 FITEM.5.3 CM. YLINE LSEL.... P5IX CM. YLLINE CMSEL. Y LESIZE, Y1,,, 40, 1 CMDEL, Y CMDEL, Y 2-25
ANSYS结构非线性分析指南 CM, Y,AREA ASEI CM. YlAREA CHKMSH'AREA CMSEL, S, Y amesh. all CMDEL, Y CMDEL, Y1 CMDEL, Y2 nlgeom, on! Turn on geometric nonlinearity Get the node numbers for the nodes located at the top of the axis of symmetry and at bottom right of the model ntop= node(O, thick, 0) night node(radius, 0,0) Activate the monitoring of the displacement and reaction force histories during the analysis. This will be written out to the monitor file ratch.mntr monitor,I, ntop, uy monitor, 2, night, fy outres allall Output all the results for all sub-steps to the results file for later postprocessing Select the nodes located at right end and constrain their radial(x)and axial (y) direction displacement to be zero nsel. s, loc. x, radius dallall elect the nodes located at left end and constrain their radial (x)direction displacement to be zero. d all ux. 0.0 Define the load for load step 1
ANSYS结构非线性分析指南 Select the nodes located at top surface of plate and apply a uniform pressure of 1. 25 N/m/2 as dead load on the plate nsel, S, loc, y, thick sf. al pres, 1. 25 alls! Select all node Define the number of sub-steps(10). Also define maximum number of A substeps(50), and the minimum number of substeps (5)for the automatic I time stepping algorithm nsub.10 A load of: applied pressure(1. 25)/number of sub-steps(10)=0.125 N/m/2 will be applied for the first sub-step solve Solve load step 1 f=0.0425 Define the parameter, f, used to apply the cyclic point load Over six load steps apply a cyclic point load of magnitude f=0.0425 units I applied at the center of the plate over three cycles Start Cycle I nsel, s, node,, ntop f, all, fy, - f Define load for load step subst, 4.25.2 he number of substeps, max and min numbe Solve load step 2 f, all, fy, f I Define load for load step 3 nselall subst, 4.25.2 Set the number of substeps, max and min number i of su Solve load step 3 Start Cycle 2 2-27
ANSYS结构非线性分析指南 nsel, s, node,, ntop f, all, ty,f I Define load for load step 4 nsel. all subst, 4, 25, 2 I Set the number of substeps, max and min number of substeps solve Solve load step 4 nsel, s, node, ntop f, all, fy, f I Define load for load step 5 nsel. all subst 4.25.2 I Set the number of substeps, max and min number of subster solve Solve load step 5 Define load for load step 6 subst, 4.25.2 Set the number of substeps, max and min number of substeps Solve load step 6 f, all, fy, f Define load for load step 7 nsel all subst 4.25.2 Set the number of substeps, max and min number of sub-steps. solve I Solve load step 7 fini /post I setlast Read in the results from the last sub-step of .(final state) pldi, 2 Plot the deformed mesh with the undeformed Plot the total plastic strains /post26 Plot the mesh