principal stress vs von Mises stress

[marcollino]

Hi,

I'm new in the field of structural mechanics and I'm struggling with what kind of model and for which kind of situation should I use. I there any good book, someone could recommend me, that includes the theory for brittle and ductile materials together with comparison between principal stress method and von Mises stress theory?

marcollino

 

[GBor]

Might want to do a search on Eng-Tips. A quick search found three similarly titled threads. Here's one:

thread727-148480

Garland E. Borowski, PE
Borowski Engineering & Analytical Services, Inc.
Lower Alabama SolidWorks Users Group

 

[jte]

marcollino-

I'd look at Popov, Mechanics of Materials
and Boresi, Schmidt, and Sidebottom, Advanced Mechanics of Materials

jt

 

[ThetaJC]

There are several good books on this subject matter. Ductile materials generally tend to fail in shear while brittle materials generally tend to fail in a plane perpendicular to the normal stress. So although not an absolute rule, a good guideline is to use Von-mises stresses (or Tresca stress, which is more conservative) for monotonic ductile material failure, and use the 1st principle stress to evaluate a brittle material's strength in tension, and perhaps even the 3rd principle stress to evaluate against the compressive strength of the brittle material. Again, I would follow the above suggestions and get a good reference book to give you more details.

ThetaJC
Founder of

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