9
votes
Accepted
What is the difference between implicit and explicit analysis in ABAQUS?
The basic difference between implicit and explicit dynamics solutions is that an explicit solution takes account of the finite propagation speed (at the speed of sound) of dynamic effects through the ...
- 12.5k
3
votes
Physical meaning of increment in static problem in abaqus
In linear static formulation of FE problem the equations do not include time, so the time you enter is not used.
If, however, you are doing an implicit time dependent analysis, the time and time-...
- 131
3
votes
Accepted
Physical meaning of increment in static problem in abaqus
"Statics" usually is defined as meaning that the acceleration of the structure is too small to cause significant inertia forces, i.e. the "mass $\times$ acceleration" terms in the equations of motion ...
- 12.5k
3
votes
What is the good reason if the curves between two results are not similar?
These look like some sort of tensile test on a ductile material which is loaded until it breaks.
In the experiment, it looks like the test rig has some "slack" which gets taken up when the load ...
- 12.5k
3
votes
How to derive deformation gradient or displacement gradient?
From a theoretical standpoint, the displacement gradient is equivalent to strain (assuming a structural problem).
Numerically, you can obtain the derivate of a quantity through multiplication with ...
2
votes
Accepted
How to decide initial size increment in Abaqus Dynamic Implicit?
It really depends on two things:
What do you hope to get out of the analysis?
How much discretization do you need to integrate the equations?
For the first item, if you need 100 snapshots of ...
- 36
2
votes
Accepted
What are exact location of Integration Points in STRI3 element in ABAQUS?
The STRI3 element is a shell element has 3 integration points according to the ABAQUS manual.
Forget 3D coordinates (global X,Y,Z) for the moment. Just think of the shell's local 2D coordinate system ...
- 1,217
2
votes
What is the difference between implicit and explicit analysis in ABAQUS?
In Abaqus, there are two primary analysis methods used for solving structural problems, namely Abaqus/Standard and Abaqus/Explicit (includes dynamic Explicit). Abaqus/Standard has static implicit and ...
- 21
2
votes
Accepted
Is it true that if the structure damaged or corroded, the stress will be lower?
Maybe it is correct, maybe it isn't.
Suppose you "corrode away" a small radius that was causing a stress concentration, and it becomes a bigger radius. Quite likely the maximum stress in the ...
- 12.5k
2
votes
How to calculate residual strength of a corroded structure from their stress values?
The strength of the steel has not changed unless there is some factor you have not mentioned. You can get a good estimate of the remaining strength of the structure by putting in the minimum remaining ...
- 6,102
2
votes
Accepted
What is the good reason if the curves between two results are not similar?
The tail end of the curve is probably not a massive issue as that is well into the region which would normally be considered failure in any case and FE systems often don't really look at failure mode ...
- 15.1k
2
votes
Accepted
How to obtain strain and stress values by editing abaqus input file?
just guessing you might be seeking ascii human readable reporting, you can put in the inp file, (after your first *STEP line.)
...
- 959
2
votes
Physical meaning of increment in static problem in abaqus
Static analysis is an ideal scenario, no real event is actually static- either quasi-static or dynamic.
It is based on the assumption that all loads are applied slowly and gradually until they reach ...
- 93
1
vote
Is it possible to convert a structure with a .stl file to a solid structure in Abaqus?
I'm not a user of Abaqus, but take advantage of the hobbyist (free) version of Fusion 360. The program enables one to import a mesh file (STL) which one then converts to BREP. Once in BREP form, the ...
- 6,860
1
vote
Plasticity (stress(strain)) interpolation in Abaqus
I think the table lists the "true stress vs strain curve" data for a specimen going through cyclic loading (to yield) - unloading tests. In such an application, the yield point tends to move ...
- 8,084
1
vote
Accepted
Calculating stress in a member
Your answer seems correct (in magnitude), verified by a quick check on the stress of member AB shown below. You shall check/confirm the stress in member BC by hand calc though.
- 8,084
1
vote
Are there any ways to know whether the element has failed under loading, while knowing only limited properties?
You have left out the most important data of the concrete - grade 25 concrete (M25), which has a compressive strength ($f_c'$) of, approximately, 3600 psi (or 3625 psi to be close to exact).
I assume ...
- 8,084
1
vote
How to perform 3 point bending test by using force instead of displacement in ABAQUS?
If the model is a three dimensional object, restrain exactly 6 degrees of freedom, so it can not translate or rotate, but it can deform in any way without creating reaction forces at the restraints.
...
- 12.5k
1
vote
How the amount of bolt's preload in a single lap joint can change the natural frequencies?
I'm unsure about the magnitude of the change, but providing tension by preloading an object definitely alters the natural frequency. It is commonly adopted to avoid resonance from external disruptions....
- 498
1
vote
What is the good reason if the curves between two results are not similar?
Well, two categories of questions come to mind straight away:
1) what values were used for the FEM? Are they based on the actual material tested? What was the source of those values and the ...
- 15.3k
1
vote
ABAQUS Analysis: Difference between assigning Section as Plane stress/strain vs. Element type?
plane stress, plane strain, and generalized plane strain are three different things. In each case you need to specify the appropriate element type ( plane stress is default ).
Generalized plane ...
- 959
1
vote
Cyclic loading on ABAQUS CAE
In general, how you use ABAQUS depends on what you are looking to observe. Are you hoping to simply observe stress or deflection as a function of time? Are you trying to simulate damage or failure? ...
- 313
1
vote
Accepted
How to know which constraints suffer from 'nodes are used more than once as slave node' in abaqus?
in many cases where this type error is detected during job submission a node set is created to identify the offending nodes.
open the odb in the visualization module, go into display group manager, ...
- 959
1
vote
Mechanical Engineering- Modeling contact in Abaqus
There can be thousands of causes for your error. You need to give many more informations to be able to make a guess.
Like: discretization, solving methods for the DEQs, grid topology, boundary ...
- 223
1
vote
How to decide initial size increment in Abaqus Dynamic Implicit?
By default Abaqus decides time increments adaptively. The initial time increment is typically a guess. If the guess is too large to solve the equations for the first time increment, it guesses smaller ...
- 210
1
vote
FRF based material constant optimization
I have only done this sort of optimization using non-commercial software.
Rather than trying to fit "the FRF" (i.e. the complete shape of all your measured response functions) I would start by ...
- 12.5k
1
vote
How to Plot Stress Contours in Abaqus?
In a 2d abaqus analysis you can only rotate the material orientation in-plane, in other words you can not "transform" the material 3- direction into the plane of the analysis. (Which seems to be what ...
- 959
1
vote
How to Plot Stress Contours in Abaqus?
(1) In Abaqus/CAE the stress at each integration point is given by the field variable $S$. Note that in Abaqus, like many or even most FE solvers, the stress computed is the Cauchy (true) stress. So, ...
- 136
Only top scored, non community-wiki answers of a minimum length are eligible