Notifications
Clear all

Shear test data

Page 2 / 2

jbRektor
Posts: 20
Admin
(@jbrektor)
Member
Joined: 2 years ago

The file that you attached to your post did not work. Can you post it again? Also, can you attach a short and simple Abaqus inp-file, and summary report illustrating your comments? I don't fully understand your claims.

/Jorgen

Reply
saleh
Posts: 4
(@saleh)
New Member
Joined: 5 months ago

Hello Jorgen,

Thank you so much for you response. Please note that this is my fourth or fifth message about the discussing issue here.

I'm not able to attach an inp file here. How can I attach text files (stress-strain data) or an inp file here? I can send the files to your email if it is not possible to attach them here. Anyway, I don't have you email. 

I like to explain one more time what I mean. We both agreed that the stress-Engineering strain curve and the stress-gamma curve in simple shear differs from each other (when data continues up to a relatively large gamma of 2 and equivalently engineering shear strain of about 1.4). So, the curve fitting for finding the hyperelastic model constants and then using them for the FEA can be done following one of the approaches below:

a) Approach 1 is calibrating the model using a code or program such as MCalibration that has been developed based on Engineering shear strain; The point is that the determined constants in this case are only useful in a FEM program that interpret the hyperelastic model based on Engineering shear strain.

b) Approach 2 is calibrating the model using a calibration code or software that has been developed based on gamma; The point is that the determined constants in this case are only useful in a FEM program that interpret the hyperelastic model based on Gamma.

What I'm saying is that Abaqus interprets the model constants (which are applied for the adopted hyperelastic model) as they are based on Gamma rather than the Engineering shear strain. I'm 100% sure about that. I have checked it myself in Abaqus by simulating a simple shear test continued up to relatively large shear strains. Given this issue, the curve fitting for finding the hyperelastic model constants (to be used in Abaqus) should be done using a code or software which has been developed based on Gamma rather than Engineering shear strain. However, Mcalibration has been developed based on Engineering strain and true strain.
So, I'm saying that MCalibration is not helpful for my purpose. If you agree with me, I wonder whether there is any way that I can calibrate my hyperelastic model based on Gamma.

I tried to attach an inp file and also my stress-strain data for you to check it yourself in case you don't agree with me. However, I'm not able to attach them here.

Finally, please note that I'm talking about calibrating a hysteretic curve using combination of Yeoh and BB model. In MCalibration, there is a model called ABAQUS-PRF-2Net-Yeoh-BB. However, it is not helpful for my purpose due to the raised issue above. 

Thank you so much for your time.

Saleh

 

 

Reply
saleh
Posts: 4
(@saleh)
New Member
Joined: 5 months ago

Hello Jorgen,

I do appreciate it if you read my above message.

Also, please note that I'm not able to attach an inp file or a text file (stress-strain data) here. How can I attach these kinds of files here? I can send the files to your email if it is not possible to attach them here. However, I don't have your email. 

Thank you so much for your attention.

Reply
Jorgen
Posts: 3921
Moderator
(@jorgen)
Member
Joined: 2 years ago

This is just a test message to see if I can insert a mcal-file in the response. It seems to work. Can you try to attached your files again?

/Jorgen

Reply
Page 2 / 2
Share: