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principal stress vs von Mises stress

principal stress vs von Mises stress

principal stress vs von Mises stress

(OP)
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

RE: principal stress vs von Mises stress

marcollino-

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

jt

RE: principal stress vs von Mises stress

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 www.engspreadsheets.com your source of no cost, professional grade spreadsheets.

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