ALLIE vs Energy from integrating force vs displacement

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ALLIE vs Energy from integrating force vs displacement

Abaqus Users mailing list
Hi,


Can someone tell me how Abaqus calculates ALLIE (Internal Energy)?


I am doing an impact analysis and I extract force and displacement from impactor. But when I integrate it to calculate the energy it comes out very different from ALLIE..


I am curious why is it so? I only extract the ALLIE of the impacted plate.


When I compare my results with the experimental data, I found that the energy obtained from F-d integration is close to experimental values. Therefore I am not sure why ALLIE is different?


Moeen




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Re: ALLIE vs Energy from integrating force vs displacement

Abaqus Users mailing list
Hi there,ALLIE is calculated through the area under load-deflection curve of the impactor. Be aware that it keeps rising until peak of F-d curve then the returning part comes through subtracting the backward behavior of F-d curve.
You can try it by yourself on Excel.
Regards,




      From: "Moeen Saeed [hidden email] [Abaqus]" <[hidden email]>
 To: [hidden email]
 Sent: Thursday, 11 May 2017, 0:53:38
 Subject: [Abaqus] ALLIE vs Energy from integrating force vs displacement

    Hi,


Can someone tell me how Abaqus calculates ALLIE (Internal Energy)?


I am doing an impact analysis and I extract force and displacement from impactor. But when I integrate it to calculate the energy it comes out very different from ALLIE..


I am curious why is it so? I only extract the ALLIE of the impacted plate.


When I compare my results with the experimental data, I found that the energy obtained from F-d integration is close to experimental values. Therefore I am not sure why ALLIE is different?


Moeen


[Non-text portions of this message have been removed]


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