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[dlee0041]

hello 

I am receiving the error message 

"An error occurred inside the FATIGUE module: Invalid or missing stress life curve."

 

I believe I need to add the alternating stress mean stress into my Engineering data source as an material property for my material. I do not know the additional components that make up this property. I am working with the material Al 7075 t6. What properties am I missing.

 

I am also receiving an error message

" During this solution, the elapsed time exceeded the CPU time by an excessive margin.  Often this indicates either a lack of physical memory (RAM) required to efficiently handle this simulation or it indicates a particularly slow hard drive configuration.  This simulation can be expected to run faster on identical hardware if additional RAM or a faster hard drive configuration is made available.  For more details, please see the ANSYS Performance Guide which is part of the ANSYS Help system."

 

[Sandeep Medikonda]

Hi,

  Yes, you would need the materials S-N Curves. I happen to have this material, you can digitize from this image:

In addition to this, you might just need the Tensile Ultimate Strength, which you should be able to get from a quick search.

Regards,
Sandeep
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[peteroznewman]

Hi dlee,

The other part of your question refers to the message about elapsed time of the solution.

Here is the brief answer.

Here is one post out of a longer discussion about selecting a good computer for ANSYS that talks about RAM.

Regards,
Peter

 

[chibennett]

SandeepMedikonda,

I am working on a school project that requires the use of AL 7075. Your SN curve for AL 7075 is the only one I can find. Can I please know your source for this? I would like to be able to give appropriate citations for this information. 

Thank you,

Michal

[chibennett]

SandeepMedikonda,

I am working on a school project that requires the use of AL 7075. Your S-N Curve for AL 7075 is the only one that I can seem to find. Could you please tell me your source for this information? I would like to give appropriate citations for this data. 

Thank you, 

Michal 

Hi,

  Yes, you would need the materials S-N Curves. I happen to have this material, you can digitize from this image:

In addition to this, you might just need the Tensile Ultimate Strength, which you should be able to get from a quick search.

Regards,
Sandeep
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[shubhammevada3112]

How to digitize the data from the image? I need this exact for my analsys but seems I can't find the cycles and stress accurate. Please help ASAP