diff --git a/src/Mod/Fem/CMakeLists.txt b/src/Mod/Fem/CMakeLists.txt
index b73ac60203..fd95279925 100755
--- a/src/Mod/Fem/CMakeLists.txt
+++ b/src/Mod/Fem/CMakeLists.txt
@@ -251,6 +251,8 @@ SET(FemTestsCcx_SRCS
     femtest/data/calculix/box_static_expected_values
     femtest/data/calculix/box_static.FCStd
     femtest/data/calculix/box.FCStd
+    femtest/data/calculix/ccx_buckling_flexuralbuckling.dat
+    femtest/data/calculix/ccx_buckling_flexuralbuckling.inp
     femtest/data/calculix/ccxcantilever_faceload.inp
     femtest/data/calculix/ccxcantilever_hexa20.inp
     femtest/data/calculix/ccxcantilever_nodeload.inp
diff --git a/src/Mod/Fem/femtest/app/test_solver_calculix.py b/src/Mod/Fem/femtest/app/test_solver_calculix.py
index d9afcd4e68..c444252e27 100644
--- a/src/Mod/Fem/femtest/app/test_solver_calculix.py
+++ b/src/Mod/Fem/femtest/app/test_solver_calculix.py
@@ -95,6 +95,14 @@ class TestSolverCalculix(unittest.TestCase):
         setup(self.document, "calculix")
         self.input_file_writing_test(get_namefromdef("test_"))
 
+    # ********************************************************************************************
+    def test_ccx_buckling_flexuralbuckling(
+            self
+    ):
+        from femexamples.ccx_buckling_flexuralbuckling import setup
+        setup(self.document, "calculix")
+        self.input_file_writing_test(get_namefromdef("test_"))
+
     # ********************************************************************************************
     def test_ccxcantilever_faceload(
         self
diff --git a/src/Mod/Fem/femtest/data/calculix/ccx_buckling_flexuralbuckling.dat b/src/Mod/Fem/femtest/data/calculix/ccx_buckling_flexuralbuckling.dat
new file mode 100644
index 0000000000..3bf8140503
--- /dev/null
+++ b/src/Mod/Fem/femtest/data/calculix/ccx_buckling_flexuralbuckling.dat
@@ -0,0 +1,90 @@
+
+ total force (fx,fy,fz) for set FEMCONSTRAINTDISPLACEMENT and time  0.0000000E+00
+
+       -1.815215E-14 -1.262879E-14  2.100000E+01
+
+     B U C K L I N G   F A C T O R   O U T P U T
+
+ MODE NO       BUCKLING
+                FACTOR
+
+      1   0.5353773E+02
+      2   0.1123524E+03
+      3   0.4429172E+03
+      4   0.8406785E+03
+      5   0.1066613E+04
+      6   0.1760440E+04
+      7   0.1781060E+04
+      8   0.2428616E+04
+      9   0.2625109E+04
+     10   0.3032522E+04
+
+                    E I G E N V A L U E    N U M B E R     1
+
+
+ total force (fx,fy,fz) for set FEMCONSTRAINTDISPLACEMENT and time  0.0000000E+00
+
+       -7.458668E-01 -9.617507E-11  2.833724E-10
+
+                    E I G E N V A L U E    N U M B E R     2
+
+
+ total force (fx,fy,fz) for set FEMCONSTRAINTDISPLACEMENT and time  0.0000000E+00
+
+       -6.275975E-10 -1.078238E+00 -3.371250E-10
+
+                    E I G E N V A L U E    N U M B E R     3
+
+
+ total force (fx,fy,fz) for set FEMCONSTRAINTDISPLACEMENT and time  0.0000000E+00
+
+       -6.359838E+00  3.125551E-09 -1.362668E-09
+
+                    E I G E N V A L U E    N U M B E R     4
+
+
+ total force (fx,fy,fz) for set FEMCONSTRAINTDISPLACEMENT and time  0.0000000E+00
+
+       -8.090844E-10 -8.650964E+00 -1.009010E-09
+
+                    E I G E N V A L U E    N U M B E R     5
+
+
+ total force (fx,fy,fz) for set FEMCONSTRAINTDISPLACEMENT and time  0.0000000E+00
+
+       -1.618585E+01  7.626015E-10  1.475242E-09
+
+                    E I G E N V A L U E    N U M B E R     6
+
+
+ total force (fx,fy,fz) for set FEMCONSTRAINTDISPLACEMENT and time  0.0000000E+00
+
+       -2.870193E+01  7.256488E-09  1.429106E-09
+
+                    E I G E N V A L U E    N U M B E R     7
+
+
+ total force (fx,fy,fz) for set FEMCONSTRAINTDISPLACEMENT and time  0.0000000E+00
+
+       -6.840851E-09 -2.054158E+01 -1.383189E-09
+
+                    E I G E N V A L U E    N U M B E R     8
+
+
+ total force (fx,fy,fz) for set FEMCONSTRAINTDISPLACEMENT and time  0.0000000E+00
+
+       -4.289022E+01 -1.387613E-08  5.972973E-10
+
+                    E I G E N V A L U E    N U M B E R     9
+
+
+ total force (fx,fy,fz) for set FEMCONSTRAINTDISPLACEMENT and time  0.0000000E+00
+
+       -8.132224E-09  3.449459E+01 -1.246274E-10
+
+                    E I G E N V A L U E    N U M B E R    10
+
+
+ total force (fx,fy,fz) for set FEMCONSTRAINTDISPLACEMENT and time  0.0000000E+00
+
+       -5.817552E+01  2.440375E-09  1.449655E-09
diff --git a/src/Mod/Fem/femtest/data/calculix/ccx_buckling_flexuralbuckling.inp b/src/Mod/Fem/femtest/data/calculix/ccx_buckling_flexuralbuckling.inp
new file mode 100644
index 0000000000..1ec8146456
--- /dev/null
+++ b/src/Mod/Fem/femtest/data/calculix/ccx_buckling_flexuralbuckling.inp
@@ -0,0 +1,850 @@
+** written by FreeCAD inp file writer for CalculiX,Abaqus meshes
+** highest dimension mesh elements only.
+
+** Nodes
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+
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+48, 102, 100, 99, 101, 136, 134, 133, 135
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+235, 386, 385, 300, 301, 403, 402, 317, 318
+236, 387, 386, 301, 302, 404, 403, 318, 319
+237, 388, 387, 302, 303, 405, 404, 319, 320
+238, 389, 388, 303, 304, 406, 405, 320, 321
+239, 390, 389, 304, 305, 407, 406, 321, 322
+240, 391, 390, 305, 306, 408, 407, 322, 323
+241, 392, 393, 308, 307, 409, 410, 325, 324
+242, 394, 392, 307, 309, 411, 409, 324, 326
+243, 395, 394, 309, 310, 412, 411, 326, 327
+244, 396, 395, 310, 311, 413, 412, 327, 328
+245, 397, 396, 311, 312, 414, 413, 328, 329
+246, 398, 397, 312, 313, 415, 414, 329, 330
+247, 399, 398, 313, 314, 416, 415, 330, 331
+248, 400, 399, 314, 315, 417, 416, 331, 332
+249, 401, 400, 315, 316, 418, 417, 332, 333
+250, 402, 401, 316, 317, 419, 418, 333, 334
+251, 403, 402, 317, 318, 420, 419, 334, 335
+252, 404, 403, 318, 319, 421, 420, 335, 336
+253, 405, 404, 319, 320, 422, 421, 336, 337
+254, 406, 405, 320, 321, 423, 422, 337, 338
+255, 407, 406, 321, 322, 424, 423, 338, 339
+256, 408, 407, 322, 323, 425, 424, 339, 340
+
+** 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=MechanicalMaterialSolid
+Evolumes
+
+***********************************************************
+** constraints fixed node sets
+** written by write_node_sets_constraints_fixed function
+** FemConstraintDisplacement
+*NSET,NSET=FemConstraintDisplacement
+1,
+4,
+5,
+8,
+69,
+72,
+103,
+106,
+137,
+140,
+172,
+174,
+206,
+223,
+240,
+257,
+259,
+291,
+308,
+325,
+342,
+344,
+376,
+393,
+410,
+
+***********************************************************
+** Materials
+** written by write_materials function
+** Young's modulus unit is MPa = N/mm2
+** FreeCAD material name: CalculiX-Steel
+** MechanicalMaterial
+*MATERIAL, NAME=MechanicalMaterial
+*ELASTIC
+210000, 0.300
+
+***********************************************************
+** Sections
+** written by write_femelementsets function
+*SOLID SECTION, ELSET=MechanicalMaterialSolid, MATERIAL=MechanicalMaterial
+
+***********************************************************
+** At least one step is needed to run an CalculiX analysis of FreeCAD
+** written by write_step_begin function
+*STEP
+*BUCKLE
+10
+
+
+***********************************************************
+** Fixed Constraints
+** written by write_constraints_fixed function
+** FemConstraintDisplacement
+*BOUNDARY
+FemConstraintDisplacement,1
+FemConstraintDisplacement,2
+FemConstraintDisplacement,3
+
+
+***********************************************************
+** constraints force node loads
+** written by write_constraints_force function
+*CLOAD
+** FemConstraintForce
+** node loads on shape: beam:Face6
+65,3,-3.2812500000000E-01
+66,3,-6.5625000000000E-01
+67,3,-6.5625000000000E-01
+68,3,-1.3125000000000E+00
+101,3,-6.5625000000000E-01
+102,3,-1.3125000000000E+00
+135,3,-6.5625000000000E-01
+136,3,-1.3125000000000E+00
+169,3,-3.2812500000000E-01
+170,3,-6.5625000000000E-01
+203,3,-6.5625000000000E-01
+204,3,-1.3125000000000E+00
+221,3,-1.3125000000000E+00
+238,3,-1.3125000000000E+00
+255,3,-6.5625000000000E-01
+288,3,-6.5625000000000E-01
+289,3,-1.3125000000000E+00
+306,3,-1.3125000000000E+00
+323,3,-1.3125000000000E+00
+340,3,-6.5625000000000E-01
+373,3,-3.2812500000000E-01
+374,3,-6.5625000000000E-01
+391,3,-6.5625000000000E-01
+408,3,-6.5625000000000E-01
+425,3,-3.2812500000000E-01
+
+
+
+***********************************************************
+** Outputs --> frd file
+** written by write_outputs_types function
+*NODE FILE
+U
+*EL FILE
+S, E
+** outputs --> dat file
+** reaction forces for Constraint fixed
+*NODE PRINT, NSET=FemConstraintDisplacement, TOTALS=ONLY
+RF
+
+
+***********************************************************
+** written by write_step_end function
+*END STEP 
+
+***********************************************************
+** CalculiX Input file
+** written by write_footer function
+**   written by    --> FreeCAD 0.19.23856 (Git)
+**   written on    --> Tue Mar 30 10:47:39 2021
+**   file name     --> 
+**   analysis name --> Analysis
+**
+**
+***********************************************************
+**  About units:
+**  See ccx manual, ccx does not know about any unit.
+**  Golden rule: The user must make sure that the numbers he provides have consistent units.
+**  The user is the FreeCAD calculix writer module ;-)
+**
+**  The unit system which is used at Guido Dhondt's company: mm, N, s, K
+**  Since Length and Mass are connected by Force, if Length is mm the Mass is in t to get N
+**  The following units are used to write to inp file:
+**
+**  Length: mm (this includes the mesh geometry)
+**  Mass: t
+**  TimeSpan: s
+**  Temperature: K
+**
+**  This leads to:
+**  Force: N
+**  Pressure: N/mm^2
+**  Density: t/mm^3
+**  Gravity: mm/s^2
+**  Thermal conductivity: t*mm/K/s^3 (same as W/m/K)
+**  Specific Heat: mm^2/s^2/K (same as J/kg/K)
+**
diff --git a/src/Mod/Fem/femtest/test_commands.sh b/src/Mod/Fem/femtest/test_commands.sh
index 64a2756660..c3f435e7a8 100644
--- a/src/Mod/Fem/femtest/test_commands.sh
+++ b/src/Mod/Fem/femtest/test_commands.sh
@@ -77,6 +77,7 @@ make -j 4 && ./bin/FreeCADCmd -t femtest.app.test_result.TestResult.test_rho
 make -j 4 && ./bin/FreeCADCmd -t femtest.app.test_result.TestResult.test_disp_abs
 make -j 4 && ./bin/FreeCADCmd -t femtest.app.test_solver_calculix.TestSolverCalculix.test_box_frequency
 make -j 4 && ./bin/FreeCADCmd -t femtest.app.test_solver_calculix.TestSolverCalculix.test_box_static
+make -j 4 && ./bin/FreeCADCmd -t femtest.app.test_solver_calculix.TestSolverCalculix.test_ccx_buckling_flexuralbuckling
 make -j 4 && ./bin/FreeCADCmd -t femtest.app.test_solver_calculix.TestSolverCalculix.test_ccxcantilever_faceload
 make -j 4 && ./bin/FreeCADCmd -t femtest.app.test_solver_calculix.TestSolverCalculix.test_ccxcantilever_hexa20
 make -j 4 && ./bin/FreeCADCmd -t femtest.app.test_solver_calculix.TestSolverCalculix.test_ccxcantilever_nodeload
@@ -298,6 +299,11 @@ unittest.TextTestRunner().run(unittest.TestLoader().loadTestsFromName(
     'femtest.app.test_solver_calculix.TestSolverCalculix.test_box_static'
 ))
 
+import unittest
+unittest.TextTestRunner().run(unittest.TestLoader().loadTestsFromName(
+    'femtest.app.test_solver_calculix.TestSolverCalculix.test_ccx_buckling_flexuralbuckling'
+))
+
 import unittest
 unittest.TextTestRunner().run(unittest.TestLoader().loadTestsFromName(
     'femtest.app.test_solver_calculix.TestSolverCalculix.test_ccxcantilever_faceload'