use of cohesive method and XFEM together for delamination and damage analysis in Abaqus preview
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- Опубликовано: 10 фев 2025
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Comprehensive Abaqus Package: • Comprehensive Abaqus P...
Including 39 hours of step-by-step tutorials.
Step by step tutorials for using cohesive elements and cohesive surfaces:
• Simulation of Debondin...
• Impact Simulation of C...
Don’t hesitate to ask any questions you might have about the explanations presented in this video using the comments below. We try to answer all questions regarding the video details in the comments below.
This is the preview of one of our paid tutorials named: “Use of cohesive zone method and XFEM together for delamination and damage analysis in Abaqus”.
In this tutorial the micro mechanical models of fiber/matrix debonding and damage is created and analyzed. cohesive interaction is defined between fiber and matrix. the matrix is defined as an enrichment zone for XFEM analysis. The models are created in 2D space. There are two models:
1) Single fiber model
2) Multiple fiber model
In the first model, there is only one fiber and there is matrix around it. In the second model, there are 4 fibers and matrix around them. models are created step by step with detailed explanations. after the completion of the simulations, results are discussed. finally the equivalent stress-strain curve in x direction is plotted for each of the models and compared.
Package 1 specifications:
cost: 40 EUR (must be paid by the PayPal or other payment methods according to your country)
included files: tutorials, slides, Abaqus files (CAE, JNL, INP)
models are created by using Abaqus 6.14 (2014)
duration: 1 hour and 15 minutes
size of the package: 250 MB
level: advanced
after watching this video, you can ask your questions about video explanations and tutorial's content by sending email to mirzabozorg71@gmail.com .
Package 2 specifications:
cost: 30 EUR (must be paid by the PayPal or other payment methods according to your country)
included files: tutorials, slides
duration: 1 hour and 15 minutes
level: advanced
after watching this video, you can ask your questions about video explanations and tutorial's content by sending email to mirzabozorg71@gmail.com .
Package 3 specifications:
cost: 15 EUR (must be paid by the PayPal or other payment methods according to your country)
included files: Abaqus files (CAE, JNL, INP)
models are created by using Abaqus 6.14 (2014)
level: advanced
table of technical content:
how to define cohesive interaction in Abaqus/Standard solver
how to define XFEM crack and enrichment zone for crack propagation
how to set Abaqus/Standard solver for performing highly nonlinear fracture analysis
how to obtain the equivalent stress-strain curve in micro models
#Abaqus
#XFEM
#crack
#fracture
#fracture_mechanics
#crack_propagation
#crack_analysis
#CZM
#cohesive
#cohesive_element
#cohesive_surface
#delamination
Thank you so much for this video.
This paid video helped me a lot in doing my thesis.
Your explanations are very good and in detail.
hi.
you're welcome.
Very good training. Thank you for your effort
Hi.
You are welcome.
hi, I have a question, would you please guide me?
in simulating mode 1 we implement ultimate strength for Maxps, If we wanna simulate the mixed mode or mode 2 fracture, what should we use in the Maxps box?
Hi.
Yes of course.
For mode 2, you can enter the damage initiation stress of the shear test or torsion test (I guess for torsion case, the stress must be multiplied by a factor). About the mixed mode, unfortunately there is no specific value and this is the problem of XFEM because its damage initiation stress is not dependent on the loading condition and for example you cannot define a table to find the initiation stress according to it. I myself use the MAXPS of the mode 1 but also this one is not accurate and the damage initiation criteria must be dependent on the loading condition.
Hi, I have a question and I hope you have a time for answering it.
How can I get a correlation between the diameter of fibers and the yield or ultimate stress, or a correlation between the angles of plies and that stresses? knowing that my simulation is composite plate under an impact force.
hi.
your simulation needs the macro modeling of the composite.
what we have instructed in this premium tutorial, is the micro modeling of the composite.
the diameter of the fiber affects the volume fraction of the fiber leading to the decrease or increase of the stiffness of the composite.
So, how we can get a relation between volume fraction of fiber and the strength of composite using Abaqus ?
You mean by macro modeling that we do not need to model fibers and we must model it by homogenous model of course with defining properties in different direction, is this correct?
I have forgotten to write something in my previous answer. in my previous answer, I was talking about the laminates not all of the kinds of composites. mathematical relations of laminates are written in the composite books. to understand the effect of volume fraction of fiber on the mechanical behavior of the composite, micro mechanical modeling using FE must be used.
you must model the composite for several times. in each model, the volume fraction of the fiber must be increase. for example : 10% in model 1, 20% in model 2, …, 90% percent in model 9. by calculating the young's modulus of each of the models, you can find the effect of the volume fraction of fiber on the strength of the composite.
@@FemexIran please if you have a time can you explain how by calculating the young's modulus we can get the yield and ultimate strength for different model?
I'm so sorry for taking your time
@@maritarahme4867 hi.
you are welcome.
in a composite and its micro mechanical model, after getting the force-displacement curve and changing it to stress-strain curve, the slope of the elastic region is the young's modulus. also you can calculate the other mechanical properties from that curve:
- the end of the elastic region is the yield point.
- the maxima of the curve is the ultimate point.
nice
when I use cohesive method and XFEM together, the error "Analysis Input File Processor exited with an error." stop the calculation and ONLY FIRST ORDER 2D ELEMENT, FIRST ORDER STRESS-DISPLACEMENT BRICK ELEMENT AND FIRST ORDER OR SOME SECOND ORDER STRESS-DISPLACEMENT TET ELEMENTS (C3D10 AND C3D10H) ARE ALLOWED IN THE ENRICHMENT,TYPE=PROPAGATION CRACK. Can you please help me out?
Hi.
Are you talking about the models provided in this premium tutorial ?
Have you bought it previously ?
Assalamualaikum sir
Hi.
ohh I am sorry I was not clear. My cracks are stationary and have predefined location. I just want to see change in stress field before and after crack appearance in the sample. but all cracks do not appear at same time , at different simulation time??
I answered your question.
for further discussions, please reply to my answer in there.
Can you please help me out? I need to apply Incremental loads with a speed ratio of
10 kN/min on a test specimens using ABAQUS/standard. Do You have something to tell me how can I did it? I hope you have and I am waiting you.
hi.
yes I can.
if in your model, the unit of force is Newton and the unit of time is second, the speed ratio is 10000/60 (N/s). using this ratio depends on the chosen step and its time period. for example if the step is Static general and its time period is 2 sec, in the load settings, you must select ramp amplitude and enter 2*10000/60 for the magnitude.
@@FemexIran so, for time period 1sec, if I insert 10000/60 for load, can I found the ultimate and yield load? For example if it is 350kn, can I found it???
@@malcolmm4876 if you want to find the yield and ultimate loads, you must use another type of loading. what you asked previously is force control loading because you want to insert the rate of force. but for finding the ultimate and yield forces, usually we must use displacement control loading. in this case force is applied as a non zero boundary condition. this happens in the compression, tension, 3 and 4 point bending tests.
Hello FEMEX. I have known crack locations (more than 2 cracks) in a model. But cracks appear at different stress level. eg I start with 1 crack in the model, and as soon as applied load reaches say 1 kN then second crack appears in a given location. How to do this? Please help . Thank you in advance.
hi.
it is not possible to control the crack initiation via applied load because the crack initiation is dependent on the stress or strain levels.
if you want to start with 1 crack in the model, you must define an initial crack for it.
if you do this, in the first part of the simulation this crack will propagate then from the middle of the simulation, the other crack will be initiated.
@@FemexIran ohh I am sorry I was not clear. My cracks are stationary and have predefined location. I just want to see change in stress field before and after crack appearance in the sample. but all cracks do not appear at same time , at different simulation time??
@@hellosushant9471 actually you cannot control the order of crack initiation or appearance. the stress or strain levels and the defined criteria determines the order of crack initiation.
@@FemexIran Sir, actually I am not allowing crack propagation, just prior known multiple cracks at different location but at different iteration (=loading value)??
@@hellosushant9471 hi.
I didn't understand this explanation.
please explain in more details.