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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 ...
alephzero's user avatar
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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-...
hdrz's user avatar
  • 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 ...
alephzero's user avatar
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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 ...
Robbie van Leeuwen's user avatar
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 ...
JCS's user avatar
  • 36
2 votes
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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 ...
pauloz1890's user avatar
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2 votes
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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.) ...
agentp's user avatar
  • 949
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 ...
Schneider's user avatar
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 ...
Hussein's user avatar
  • 21
2 votes
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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 ...
alephzero's user avatar
  • 12.6k
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 ...
blacksmith37's user avatar
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2 votes
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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 ...
Chris Johns's user avatar
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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 ...
fred_dot_u's user avatar
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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 ...
r13's user avatar
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1 vote
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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.
r13's user avatar
  • 8,237
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 ...
r13's user avatar
  • 8,237
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. ...
alephzero's user avatar
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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 ...
Solar Mike's user avatar
  • 15.9k
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 ...
agentp's user avatar
  • 949
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? ...
User2341's user avatar
  • 313
1 vote
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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, ...
agentp's user avatar
  • 949
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....
Petrichor's user avatar
  • 508
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 ...
JE_Muc's user avatar
  • 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 ...
BobTheAverage's user avatar
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 ...
alephzero's user avatar
  • 12.6k
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 ...
agentp's user avatar
  • 949
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, ...
Marchi's user avatar
  • 136

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