[SOLVED] Error using *STEP, PERTURBATION

About the development of the FEM module/workbench.

Moderator: bernd

Forum rules
and Helpful information for the FEM forum
IMPORTANT: Please click here and read this first, before posting on this FEM fourm
Post Reply
EkaitzEsteban
Posts: 108
Joined: Wed Sep 12, 2018 1:31 pm

[SOLVED] Error using *STEP, PERTURBATION

Post by EkaitzEsteban »

Hello,

I am trying to work with the perturbation card. Apparently, compressed frequency analysis can be done in calculix.


I use cantilever beam example and I add to the .inp file the following code:

Code: Select all

***********************************************************
** Node loads Constraints
** written by write_constraints_force function
*CLOAD
** FemConstraintForce
** node loads on shape: Box:Face2
1,3,-0.0000000000000E+00
2,3,-0.0000000000000E+00
3,3,-0.0000000000000E+00
4,3,-0.0000000000000E+00
49,3,-0.0000000000000E+00
64,3,-7.5000000000000E+05
88,3,-7.5000000000000E+05
100,3,-7.5000000000001E+05
102,3,-7.4999999999999E+05
188,3,-1.5000000000000E+06
189,3,-1.5000000000000E+06
190,3,-1.5000000000000E+06
191,3,-1.5000000000000E+06
*END STEP # end static analysis
*STEP, PERTURBATION # starts with the new perturbation analysis
*FREQUENCY
10


***********************************************************
** Outputs --> frd file
** written by write_outputs_types function
*NODE FILE
U
*EL FILE
S, E
** outputs --> dat file
*NODE PRINT , NSET=Nall
U 
*EL PRINT , ELSET=Eall
S 

***********************************************************
** written by write_step_end function
*END STEP 

***********************************************************
However, the following error is obtained:

FEM: No result object in active Analysis.

best regards,

Ekaitz.

EDIT: When performing a STATIC analysis density value of the material is left (in cantiveler beam for example) and this value is mandatory for performing Frequency Analysis

EXAMPLE CODE HERE:

Code: Select all

** written by FreeCAD inp file writer for CalculiX,Abaqus meshes
** highest dimension mesh elements only.

** Nodes
*Node, NSET=Nall
1, 8000, 1000, 0
2, 8000, 1000, 1000
3, 8000, 0, 0
4, 8000, 0, 1000
5, 0, 1000, 0
6, 0, 1000, 1000
7, 0, 0, 0
8, 0, 0, 1000
9, 728, 1000, 1000
10, 1456, 1000, 1000
11, 2184, 1000, 1000
12, 2912, 1000, 1000
13, 3640, 1000, 1000
14, 4368, 1000, 1000
15, 5096, 1000, 1000
16, 5824, 1000, 1000
17, 6552, 1000, 1000
18, 7280, 1000, 1000
19, 728, 0, 1000
20, 1456, 0, 1000
21, 2184, 0, 1000
22, 2912, 0, 1000
23, 3640, 0, 1000
24, 4368, 0, 1000
25, 5096, 0, 1000
26, 5824, 0, 1000
27, 6552, 0, 1000
28, 7280, 0, 1000
29, 728, 1000, 0
30, 1456, 1000, 0
31, 2184, 1000, 0
32, 2912, 1000, 0
33, 3640, 1000, 0
34, 4368, 1000, 0
35, 5096, 1000, 0
36, 5824, 1000, 0
37, 6552, 1000, 0
38, 7280, 1000, 0
39, 728, 0, 0
40, 1456, 0, 0
41, 2184, 0, 0
42, 2912, 0, 0
43, 3640, 0, 0
44, 4368, 0, 0
45, 5096, 0, 0
46, 5824, 0, 0
47, 6552, 0, 0
48, 7280, 0, 0
49, 8000, 500, 500
50, 0, 500, 500
51, 4731.999999772, 500.0000010858, 499.9999985991
52, 0, 500, 1000
53, 364, 1000, 1000
54, 1092, 1000, 1000
55, 1820, 1000, 1000
56, 2548, 1000, 1000
57, 3276, 1000, 1000
58, 4004, 1000, 1000
59, 4732, 1000, 1000
60, 5460, 1000, 1000
61, 6188, 1000, 1000
62, 6916, 1000, 1000
63, 7640, 1000, 1000
64, 8000, 500, 1000
65, 364, 0, 1000
66, 1092, 0, 1000
67, 1820, 0, 1000
68, 2548, 0, 1000
69, 3276, 0, 1000
70, 4004, 0, 1000
71, 4732, 0, 1000
72, 5460, 0, 1000
73, 6188, 0, 1000
74, 6916, 0, 1000
75, 7640, 0, 1000
76, 0, 500, 0
77, 364, 1000, 0
78, 1092, 1000, 0
79, 1820, 1000, 0
80, 2548, 1000, 0
81, 3276, 1000, 0
82, 4004, 1000, 0
83, 4732, 1000, 0
84, 5460, 1000, 0
85, 6188, 1000, 0
86, 6916, 1000, 0
87, 7640, 1000, 0
88, 8000, 500, 0
89, 364, 0, 0
90, 1092, 0, 0
91, 1820, 0, 0
92, 2548, 0, 0
93, 3276, 0, 0
94, 4004, 0, 0
95, 4732, 0, 0
96, 5460, 0, 0
97, 6188, 0, 0
98, 6916, 0, 0
99, 7640, 0, 0
100, 8000, 1000, 500
101, 0, 1000, 500
102, 8000, 0, 500
103, 0, 0, 500
104, 364, 500, 1000
105, 728, 500, 1000
106, 1092, 500, 1000
107, 1456, 500, 1000
108, 1820, 500, 1000
109, 2184, 500, 1000
110, 2548, 500, 1000
111, 3276, 500, 1000
112, 3640, 500, 1000
113, 4004, 500, 1000
114, 4368, 500, 1000
115, 4732, 500, 1000
116, 5096, 500, 1000
117, 5460, 500, 1000
118, 5824, 500, 1000
119, 6188, 500, 1000
120, 6552, 500, 1000
121, 6916, 500, 1000
122, 7640, 500, 1000
123, 2912, 500, 1000
124, 7280, 500, 1000
125, 364, 500, 0
126, 1092, 500, 0
127, 728, 500, 0
128, 1820, 500, 0
129, 1456, 500, 0
130, 2548, 500, 0
131, 2184, 500, 0
132, 3640, 500, 0
133, 3276, 500, 0
134, 4004, 500, 0
135, 5096, 500, 0
136, 4732, 500, 0
137, 5460, 500, 0
138, 6188, 500, 0
139, 5824, 500, 0
140, 6916, 500, 0
141, 6552, 500, 0
142, 7640, 500, 0
143, 2912, 500, 0
144, 4368, 500, 0
145, 7280, 500, 0
146, 364, 1000, 500
147, 728, 1000, 500
148, 1092, 1000, 500
149, 1456, 1000, 500
150, 1820, 1000, 500
151, 2184, 1000, 500
152, 2548, 1000, 500
153, 3276, 1000, 500
154, 3640, 1000, 500
155, 4004, 1000, 500
156, 4368, 1000, 500
157, 4732, 1000, 500
158, 5096, 1000, 500
159, 5460, 1000, 500
160, 5824, 1000, 500
161, 6188, 1000, 500
162, 6552, 1000, 500
163, 6916, 1000, 500
164, 7640, 1000, 500
165, 2912, 1000, 500
166, 7280, 1000, 500
167, 364, 0, 500
168, 1092, 0, 500
169, 728, 0, 500
170, 1820, 0, 500
171, 1456, 0, 500
172, 2548, 0, 500
173, 2184, 0, 500
174, 3640, 0, 500
175, 3276, 0, 500
176, 4004, 0, 500
177, 5096, 0, 500
178, 4732, 0, 500
179, 5460, 0, 500
180, 6188, 0, 500
181, 5824, 0, 500
182, 6916, 0, 500
183, 6552, 0, 500
184, 7640, 0, 500
185, 2912, 0, 500
186, 4368, 0, 500
187, 7280, 0, 500
188, 8000, 250, 250
189, 8000, 250, 750
190, 8000, 750, 750
191, 8000, 750, 250
192, 0, 250, 750
193, 0, 250, 250
194, 0, 750, 250
195, 0, 750, 750
196, 1456, 500, 500
197, 6552, 500, 500
198, 6916, 500, 500
199, 2184, 500, 500
200, 2548, 500, 500
201, 2912, 500, 500
202, 1820, 500, 500
203, 7640, 750, 250
204, 7640, 750, 750
205, 7280, 500, 500
206, 7640, 250, 250
207, 5460, 500, 500
208, 5096, 500, 500
209, 6188, 500, 500
210, 5824, 500, 500
211, 364, 750, 250
212, 364, 750, 750
213, 364, 250, 250
214, 1092, 500, 500
215, 728, 500, 500
216, 364, 250, 750
217, 4549.999999886, 250.0000005429, 249.9999992995
218, 4549.999999886, 750.0000005429, 249.9999992995
219, 4549.999999886, 750.0000005429, 749.9999992995
220, 4368, 500, 500
221, 4549.999999886, 250.0000005429, 749.9999992995
222, 4913.999999886, 250.0000005429, 749.9999992995
223, 4913.999999886, 750.0000005429, 749.9999992995
224, 3276, 500, 500
225, 3640, 500, 500
226, 4004, 500, 500
227, 4913.999999886, 750.0000005429, 249.9999992995
228, 4913.999999886, 250.0000005429, 249.9999992995


** Volume elements
*Element, TYPE=C3D10, ELSET=Evolumes
149, 19, 40, 10, 20, 168, 196, 106, 66, 171, 107
150, 31, 10, 30, 40, 150, 149, 79, 128, 196, 129
151, 17, 38, 18, 47, 163, 166, 62, 197, 140, 198
152, 41, 32, 11, 12, 130, 152, 199, 200, 165, 56
153, 32, 12, 41, 42, 165, 200, 130, 143, 201, 92
154, 21, 42, 12, 22, 172, 201, 110, 68, 185, 123
155, 31, 10, 40, 11, 150, 196, 128, 151, 55, 202
156, 12, 11, 41, 21, 56, 199, 200, 110, 109, 173
157, 41, 20, 11, 40, 170, 108, 199, 91, 171, 202
158, 41, 20, 21, 11, 170, 67, 173, 199, 108, 109
159, 11, 32, 41, 31, 152, 130, 199, 151, 80, 131
160, 10, 11, 20, 40, 55, 108, 107, 196, 202, 171
161, 17, 38, 47, 37, 163, 140, 197, 162, 86, 141
162, 18, 38, 49, 48, 166, 203, 204, 205, 145, 206
163, 15, 46, 45, 36, 207, 96, 208, 159, 139, 137
164, 16, 47, 46, 37, 209, 97, 210, 161, 141, 138
165, 4, 18, 2, 49, 122, 63, 64, 189, 204, 190
166, 17, 18, 27, 47, 62, 121, 120, 197, 198, 183
167, 18, 38, 48, 47, 166, 145, 205, 198, 140, 98
168, 23, 12, 42, 22, 111, 201, 175, 69, 123, 185
169, 47, 26, 27, 17, 180, 73, 183, 197, 119, 120
170, 29, 50, 9, 6, 211, 212, 147, 146, 195, 53
171, 48, 27, 18, 47, 182, 121, 205, 98, 183, 198
172, 7, 8, 39, 50, 103, 167, 89, 193, 192, 213
173, 9, 40, 39, 30, 214, 90, 215, 148, 129, 126
174, 21, 42, 41, 12, 172, 92, 173, 110, 201, 200
175, 9, 50, 29, 39, 212, 211, 147, 215, 213, 127
176, 7, 29, 50, 39, 125, 211, 193, 89, 127, 213
177, 11, 31, 41, 40, 151, 131, 199, 202, 128, 91
178, 16, 47, 37, 17, 209, 141, 161, 61, 197, 162
179, 9, 40, 30, 10, 214, 129, 148, 54, 196, 149
180, 38, 2, 49, 1, 164, 190, 203, 87, 100, 191
181, 38, 2, 18, 49, 164, 63, 166, 203, 190, 204
182, 49, 48, 38, 3, 206, 145, 203, 188, 99, 142
183, 49, 38, 1, 3, 203, 87, 191, 188, 142, 88
184, 4, 49, 3, 48, 189, 188, 102, 184, 206, 99
185, 48, 28, 4, 18, 187, 75, 184, 205, 124, 122
186, 18, 49, 4, 48, 204, 189, 122, 205, 206, 184
187, 50, 7, 5, 29, 193, 76, 194, 211, 125, 77
188, 6, 50, 5, 29, 195, 194, 101, 146, 211, 77
189, 9, 50, 19, 6, 212, 216, 105, 53, 195, 104
190, 19, 50, 9, 39, 216, 212, 105, 169, 213, 215
191, 19, 50, 8, 6, 216, 192, 65, 104, 195, 52
192, 9, 40, 10, 19, 214, 196, 54, 105, 168, 106
193, 44, 51, 34, 14, 217, 218, 144, 220, 219, 156
194, 24, 51, 44, 14, 221, 217, 186, 114, 219, 220
195, 15, 25, 24, 51, 116, 71, 115, 223, 222, 221
196, 12, 43, 32, 13, 224, 133, 165, 57, 225, 153
197, 12, 43, 23, 42, 224, 174, 111, 201, 93, 175
198, 12, 43, 13, 23, 224, 225, 57, 111, 174, 112
199, 12, 43, 42, 32, 224, 93, 201, 165, 133, 143
200, 13, 34, 14, 44, 155, 156, 58, 226, 144, 220
201, 24, 14, 15, 51, 114, 59, 115, 221, 219, 223
202, 24, 23, 14, 44, 70, 113, 114, 186, 176, 220
203, 32, 33, 13, 43, 81, 154, 153, 133, 132, 225
204, 33, 34, 13, 43, 82, 155, 154, 132, 134, 225
205, 14, 35, 15, 51, 157, 158, 59, 219, 227, 223
206, 45, 25, 15, 51, 177, 116, 208, 228, 222, 223
207, 43, 44, 13, 23, 94, 226, 225, 174, 176, 112
208, 34, 35, 14, 51, 83, 157, 156, 218, 227, 219
209, 15, 46, 36, 16, 207, 139, 159, 60, 210, 160
210, 35, 36, 15, 45, 84, 159, 158, 135, 137, 208
211, 36, 37, 16, 46, 85, 161, 160, 139, 138, 210
212, 26, 25, 16, 46, 72, 117, 118, 181, 179, 210
213, 16, 47, 17, 26, 209, 197, 61, 118, 180, 119
214, 16, 47, 26, 46, 209, 180, 118, 210, 97, 181
215, 28, 27, 18, 48, 74, 121, 124, 187, 182, 205
216, 34, 35, 51, 45, 83, 227, 218, 136, 135, 228
217, 14, 13, 44, 23, 58, 226, 220, 113, 112, 176
218, 25, 44, 24, 51, 178, 186, 71, 222, 217, 221
219, 45, 44, 25, 51, 95, 178, 177, 228, 217, 222
220, 15, 46, 16, 25, 207, 210, 60, 116, 179, 117
221, 15, 46, 25, 45, 207, 179, 116, 208, 96, 177
222, 8, 50, 19, 39, 192, 216, 65, 167, 213, 169
223, 51, 35, 15, 45, 227, 158, 223, 228, 135, 208
224, 44, 34, 43, 13, 144, 134, 94, 226, 155, 225
225, 44, 51, 45, 34, 217, 228, 95, 144, 218, 136
226, 29, 9, 39, 30, 147, 215, 127, 78, 148, 126
227, 9, 40, 19, 39, 214, 168, 105, 215, 90, 169

** Define element set Eall
*ELSET, ELSET=Eall
Evolumes



***********************************************************
** Element sets for materials and FEM element type (solid, shell, beam, fluid)
** written by write_element_sets_material_and_femelement_type function
*ELSET,ELSET=SolidMaterialSolid
Evolumes

***********************************************************
** Node sets for fixed constraint
** written by write_node_sets_constraints_fixed function
** FemConstraintFixed
*NSET,NSET=FemConstraintFixed
192,
193,
194,
195,
5,
6,
7,
8,
103,
76,
50,
52,
101,

***********************************************************
** Materials
** written by write_materials function
** Young's modulus unit is MPa = N/mm2
** FreeCAD material name: CalculiX-Steel
** SolidMaterial
*MATERIAL, NAME=SolidMaterial
*ELASTIC
210000, 0.300
*DENSITY 			# BE CAREFUL!!! DO NOT FORGET DENSITY VALUE!!!!!
7.900e-09 		# BE CAREFUL!!! DO NOT FORGET DENSITY VALUE!!!!!
***********************************************************
** Sections
** written by write_femelementsets function
*SOLID SECTION, ELSET=SolidMaterialSolid, MATERIAL=SolidMaterial

***********************************************************
** At least one step is needed to run an CalculiX analysis of FreeCAD
** written by write_step_begin function
*STEP
*STATIC


***********************************************************
** Fixed Constraints
** written by write_constraints_fixed function
** FemConstraintFixed
*BOUNDARY
FemConstraintFixed,1
FemConstraintFixed,2
FemConstraintFixed,3


***********************************************************
** Node loads Constraints
** written by write_constraints_force function
*CLOAD
** FemConstraintForce
** node loads on shape: Box:Face2
1,1,-0.0000000000000E+00
2,1,-0.0000000000000E+00
3,1,-0.0000000000000E+00
4,1,-0.0000000000000E+00
49,1,-0.0000000000000E+00
64,1,-1.6666666666667E+06
88,1,-1.6666666666667E+06
100,1,-1.6666666666667E+06
102,1,-1.6666666666667E+06
188,1,-3.3333333333333E+06
189,1,-3.3333333333333E+06
190,1,-3.3333333333334E+06
191,1,-3.3333333333334E+06


** FemConstraintForce001
** node loads on shape: Box:Face6
2,3,0.0000000000000E+00
4,3,0.0000000000000E+00
6,3,0.0000000000000E+00
8,3,0.0000000000000E+00
9,3,0.0000000000000E+00
10,3,0.0000000000000E+00
11,3,0.0000000000000E+00
12,3,0.0000000000000E+00
13,3,0.0000000000000E+00
14,3,0.0000000000000E+00
15,3,0.0000000000000E+00
16,3,0.0000000000000E+00
17,3,0.0000000000000E+00
18,3,0.0000000000000E+00
19,3,0.0000000000000E+00
20,3,0.0000000000000E+00
21,3,0.0000000000000E+00
22,3,0.0000000000000E+00
23,3,0.0000000000000E+00
24,3,0.0000000000000E+00
25,3,0.0000000000000E+00
26,3,0.0000000000000E+00
27,3,0.0000000000000E+00
28,3,0.0000000000000E+00
52,3,7.5833333333333E+05
53,3,7.5833333333333E+05
54,3,7.5833333333333E+05
55,3,7.5833333333333E+05
56,3,7.5833333333333E+05
57,3,7.5833333333333E+05
58,3,7.5833333333333E+05
59,3,7.5833333333333E+05
60,3,7.5833333333333E+05
61,3,7.5833333333333E+05
62,3,7.5833333333333E+05
63,3,7.5000000000000E+05
64,3,7.5000000000000E+05
65,3,7.5833333333333E+05
66,3,7.5833333333333E+05
67,3,7.5833333333333E+05
68,3,7.5833333333333E+05
69,3,7.5833333333333E+05
70,3,7.5833333333333E+05
71,3,7.5833333333333E+05
72,3,7.5833333333333E+05
73,3,7.5833333333333E+05
74,3,7.5833333333333E+05
75,3,7.5000000000000E+05
104,3,1.5166666666667E+06
105,3,1.5166666666667E+06
106,3,1.5166666666667E+06
107,3,1.5166666666667E+06
108,3,1.5166666666667E+06
109,3,1.5166666666667E+06
110,3,1.5166666666667E+06
111,3,1.5166666666667E+06
112,3,1.5166666666667E+06
113,3,1.5166666666667E+06
114,3,1.5166666666667E+06
115,3,1.5166666666667E+06
116,3,1.5166666666667E+06
117,3,1.5166666666667E+06
118,3,1.5166666666667E+06
119,3,1.5166666666667E+06
120,3,1.5166666666667E+06
121,3,1.5166666666667E+06
122,3,1.5000000000000E+06
123,3,1.5166666666667E+06
124,3,1.5083333333333E+06


** FemConstraintForce002
** node loads on shape: Box:Face3
3,2,-0.0000000000000E+00
4,2,-0.0000000000000E+00
7,2,-0.0000000000000E+00
8,2,-0.0000000000000E+00
19,2,-0.0000000000000E+00
20,2,-0.0000000000000E+00
21,2,-0.0000000000000E+00
22,2,-0.0000000000000E+00
23,2,-0.0000000000000E+00
24,2,-0.0000000000000E+00
25,2,-0.0000000000000E+00
26,2,-0.0000000000000E+00
27,2,-0.0000000000000E+00
28,2,-0.0000000000000E+00
39,2,-0.0000000000000E+00
40,2,-0.0000000000000E+00
41,2,-0.0000000000000E+00
42,2,-0.0000000000000E+00
43,2,-0.0000000000000E+00
44,2,-0.0000000000000E+00
45,2,-0.0000000000000E+00
46,2,-0.0000000000000E+00
47,2,-0.0000000000000E+00
48,2,-0.0000000000000E+00
65,2,-3.7916666666667E+05
66,2,-3.7916666666667E+05
67,2,-3.7916666666667E+05
68,2,-3.7916666666667E+05
69,2,-3.7916666666667E+05
70,2,-3.7916666666667E+05
71,2,-3.7916666666667E+05
72,2,-3.7916666666667E+05
73,2,-3.7916666666667E+05
74,2,-3.7916666666667E+05
75,2,-3.7500000000000E+05
89,2,-3.7916666666667E+05
90,2,-3.7916666666667E+05
91,2,-3.7916666666667E+05
92,2,-3.7916666666667E+05
93,2,-3.7916666666667E+05
94,2,-3.7916666666667E+05
95,2,-3.7916666666667E+05
96,2,-3.7916666666667E+05
97,2,-3.7916666666667E+05
98,2,-3.7916666666667E+05
99,2,-3.7500000000000E+05
102,2,-3.7500000000000E+05
103,2,-3.7916666666667E+05
167,2,-7.5833333333333E+05
168,2,-7.5833333333333E+05
169,2,-7.5833333333333E+05
170,2,-7.5833333333333E+05
171,2,-7.5833333333333E+05
172,2,-7.5833333333333E+05
173,2,-7.5833333333333E+05
174,2,-7.5833333333333E+05
175,2,-7.5833333333333E+05
176,2,-7.5833333333333E+05
177,2,-7.5833333333333E+05
178,2,-7.5833333333333E+05
179,2,-7.5833333333333E+05
180,2,-7.5833333333333E+05
181,2,-7.5833333333333E+05
182,2,-7.5833333333333E+05
183,2,-7.5833333333333E+05
184,2,-7.5000000000000E+05
185,2,-7.5833333333333E+05
186,2,-7.5833333333333E+05
187,2,-7.5416666666667E+05

*END STEP 				#  Usage of the PERTURBATION CARD as shown in Calculix manual!!
*STEP,PERTURBATION			#  Usage of the PERTURBATION CARD as shown in Calculix manual!!
*FREQUENCY				#  Usage of the PERTURBATION CARD as shown in Calculix manual!!
15						#  Usage of the PERTURBATION CARD as shown in Calculix manual!!


***********************************************************
** Outputs --> frd file
** written by write_outputs_types function
*NODE FILE
U
*EL FILE
S, E
** outputs --> dat file
*NODE PRINT , NSET=Nall
U 
*EL PRINT , ELSET=Eall
S 

***********************************************************
** written by write_step_end function
*END STEP 

***********************************************************
** CalculiX Input file
** written by write_footer function
**   written by    --> FreeCAD 0.17.13528 (Git)
**   written on    --> Mon Oct 08 17:42:02 2018
**   file name     --> FemCalculixCantilever3D.FCStd
**   analysis name --> Analysis
**
**
**
**   Units
**
**   Geometry (mesh data)        --> mm
**   Materials (Young's modulus) --> N/mm2 = MPa
**   Loads (nodal loads)         --> N
**
The eigenvalues change with the preload.
Last edited by EkaitzEsteban on Mon Oct 08, 2018 3:45 pm, edited 2 times in total.
Top
User avatar
bernd
Veteran
Posts: 12851
Joined: Sun Sep 08, 2013 8:07 pm
Location: Zürich, Switzerland
Contact:
Contact bernd

Re: [Help] Error using *STEP, PERTURBATION

Post by bernd »

does ccx gives an error? If you press the run button the error should be printed in report window of FreeCAD.

Bernd
Top
EkaitzEsteban
Posts: 108
Joined: Wed Sep 12, 2018 1:31 pm

Re: [Help] Error using *STEP, PERTURBATION

Post by EkaitzEsteban »

bernd wrote: ↑Mon Oct 08, 2018 2:50 pm does ccx gives an error? If you press the run button the error should be printed in report window of FreeCAD.

Bernd
Hi bernd,

Exactly, the error appears in the Report View

Read results from: C:\Users\Usuario\Desktop\FreeCADsimulations\Box_Mesh.frd
Found: nodes
Found: elements
imported mesh: 228 nodes, 0 HEXA8, 0 PENTA6, 0 TETRA4, 79 TETRA10, 0 PENTA15
imported mesh: 0 HEXA20, 0 TRIA3, 0 TRIA6, 0 QUAD4, 0 QUAD8, 0 SEG2, 0 SEG3
FEM: No result object in active Analysis.
Top
Jee-Bee
Veteran
Posts: 2566
Joined: Tue Jun 16, 2015 10:32 am
Location: Netherlands

Re: [SOLVED] Error using *STEP, PERTURBATION

Post by Jee-Bee »

Not the first time that this problem is popping up...

See: https://forum.freecadweb.org/viewtopic.php?t=20392
Top
EkaitzEsteban
Posts: 108
Joined: Wed Sep 12, 2018 1:31 pm

Re: [SOLVED] Error using *STEP, PERTURBATION

Post by EkaitzEsteban »

Jee-Bee wrote: ↑Mon Oct 08, 2018 5:13 pm Not the first time that this problem is popping up...

See: https://forum.freecadweb.org/viewtopic.php?t=20392
Thank you Jee-bee! I solved the problem including the density value in the material. The rest is exactly as explained in Calculix manual.
Top
User avatar
bernd
Veteran
Posts: 12851
Joined: Sun Sep 08, 2013 8:07 pm
Location: Zürich, Switzerland
Contact:
Contact bernd

Re: [SOLVED] Error using *STEP, PERTURBATION

Post by bernd »

EkaitzEsteban wrote: ↑Tue Oct 09, 2018 5:46 am
Jee-Bee wrote: ↑Mon Oct 08, 2018 5:13 pm Not the first time that this problem is popping up...

See: https://forum.freecadweb.org/viewtopic.php?t=20392
Thank you Jee-bee! I solved the problem including the density value in the material. The rest is exactly as explained in Calculix manual.
Did you generate the file with FreeCAD GUI, it should have been checked for density and give an error when it is missing? Or did you run an own input file?

bernd
Top
EkaitzEsteban
Posts: 108
Joined: Wed Sep 12, 2018 1:31 pm

Re: [SOLVED] Error using *STEP, PERTURBATION

Post by EkaitzEsteban »

bernd wrote: ↑Tue Oct 09, 2018 2:39 pm
EkaitzEsteban wrote: ↑Tue Oct 09, 2018 5:46 am
Jee-Bee wrote: ↑Mon Oct 08, 2018 5:13 pm Not the first time that this problem is popping up...

See: https://forum.freecadweb.org/viewtopic.php?t=20392
Thank you Jee-bee! I solved the problem including the density value in the material. The rest is exactly as explained in Calculix manual.
Did you generate the file with FreeCAD GUI, it should have been checked for density and give an error when it is missing? Or did you run an own input file?

bernd
Hi bernd,

I think that static analysis do not require density value because solely Young Modulus and poisson ratio parameters are required for determining the matrix of Hooke's law (isotropic materials). Therefore, density value is not written when using FreeCAD GUI for a static analysis.

However, frequency analysis requires density value for determining the mass matrix. The application of perturbation step in frequency requires to firstly make an static analysis and then calculix employs the results from static analysis for the frequency. In this second step, density value must be defined.

Ekaitz.
Top
Post Reply

Return to “FEM”