The document provides step-by-step instructions for modeling the failure of a concrete cylinder under compressive loading using Abaqus. It describes how to create the cylinder geometry, apply material properties including damage and failure parameters, apply boundary conditions to rigidly fix one end, apply a pressure load to the other end, create output requests to track displacement and reaction forces, and plot the load-displacement curve. The analysis shows the cylinder fails at a load corresponding to a pressure of 22.64 MPa, which is less than the given pressure of 27 MPa, indicating the material properties need adjustment.

1. Ad 1st assignment

2. Open Abaqus

3. Click on part :-

4. Click continue :-

6. Center 0,0 and press Enter

7. A point on perimeter & press Enter

8. Now click here

9. Now here

10. Enter length of cylinder & Click OK

11. Obtain a beautiful cylinder

12. Go here click properties

13. Click Create Material

14. Click General - > Density

20. yield stress inelastic strain
2652974.61 0
3094436.04 0.000103295
13686557.6 0.00048805
21909750.7 0.000954491
26216831.2 0.001555971
26902245.8 0.002282336
25368514.1 0.003085224
22908785.7 0.003920042
20287294 0.004760438
18503462.3 0.00536195
Copy – Paste the Given Values ……….. Getting these values I’ve told in excel
sheet attached

21. yield stess cracking strain
1595000 0.00E+00
981831.7496 0.000151144
798658.4402 0.00028246
697445.153 0.00041095
630420.827 0.000538261
581606.8791 0.000664945
543890.8538 0.000791245
513548.0906 0.000917291
488408.7289 0.001043158
467109.2021 0.001168893
448742.5432 0.001294526
432678.1885 0.00142008
410675.3731 0.001620839

24. damage parameter cracking strain
0 0.00E+00
0.05 0.000151144
0.1 0.00028246
0.15 0.00041095
0.2 0.000538261
0.3 0.000664945
0.4 0.000791245
0.5 0.000917291
0.6 0.001043158
0.7 0.001168893
0.8 0.001294526
0.9 0.00142008
0.95 0.001620839

25. Click OK

30. Select the cylinder and click done

39. 1.For rigid platen put U1=0,
U2=0 at both surfaces & U3=0
on the opposite surface of
loading.
2. For Soft platen put only U3
= 0 on the opposite surface of
loading.

40. I’m solving only for rigid platen.

42. Rotate cylinder to put U1=U2=U3=0 on the opposite side
of loading for rigid platen. For soft platen it would be only
U3=0.

45. Loading
surface…..U1 =
U2=0, U3≠0
Fixed
surface…U1=U2=U3=
0.
Now we will apply load on the loading surface.

47. Rotate & Select
this top surface

51. Remember I told that loading time should be consistence with step
time……Here please note that Time span should be “Total time ”
not “Step time” so that in 0.1 sec loading will become 100%
Click
OK

52. Applied pressure > 27Mpa / area
=27e6/(3.14 X 0.15^2/4)
= 0.1528 e 9

54. 1. We Have almost done but we have not defined yet damage
parameters which will tell us, whether our concrete has failed or
not.
2. To plot load vs disp graph we have to plot total reaction at the
bottom vs disp of the top point where load was applied. So this
point I’m going to mark as reference point.
Reaction here
displacement here

55. We have to create two sets
1. For top surf disp.
2. For reactions
Go to Tools->Set->Create

56. Marking Surf for disp.
Rename it to “top_surf” and click continue

57. Select top surf and click done. I’ve
created a RP at the center but it’s
useless u can skip it.

58. Again go to Tools-> set- > Create and create 2nd set and
give name as Reactions

59. Select bottom surface and click “Done”

60. We have create sets for load vs
disp graph but we have not told
Abaqus to give me output for these
sets yet.

61. Let’s 1st use the sets that we have just
created and tell abaqus to give me
reactions as well top surf disp.
Output -> History output Request-> create

62. Let’s name this as “Tip-disp”

65. Again Output -> History output
Request-> create

68. Let’s set damage failure parameters
Output -> Feild output Request-> create

71. We have to make it independent to mess it. Right click
on Part 1-1 and select -> Make Independent

76. This is quite big mess. You can refine it for convergence
study. To do this reduce seed size from 0.021 to 0.01 in
slide no.73

81. OK Take rest now.

82. Analysis Got aborted due to errors let’s check
error.

83. This is bcoz I’ve taken taken fcr = 3.65* sqrt(fck) in tensile
properties. If you will take it above 4.5 rather 3.65 you
will not get this error and also reduce mess size. Lets’s
check results with this data.

87. DAMAGET :- TENSILE FAILURE
DAMAGEC:- Compression failure
Sdef :- Stiffness Degradation

88. Lets’s plot Load vs disp graph

90. Select All RF3 and click Save As

91. We are using ssum bcoz we have to add all reactions

92. Again for disp.

94. Select all U3 and click save as

95. This time we will not use ssum rather
we will use avg.
Click OK

97. Here my disp and rxn data has come

100. Load vs disp graph

101. Failure load = 0.4e6
Pressure = 0.4e6 /(area)
= 22.64Mpa < 27 Mpa(given in prob. statement)
Prob. is in the properties.