THEORIES OF FAILURE UNDER STATIC LOAD
THEORIES OF FAILURE
For the
ones who are searching for the topic of failures in life, love or game etc, I
suggest they can search for some other sites. This topic is related to
prediction of failure in machine members subjected to uniaxial, biaxial and
triaxial stress. As we all know, the strength of all machine parts is based on
the mechanical properties of materials used. These properties are determined by
the tension and compression tests, which can predict failure in parts subjected
to uniaxial stress.
Ductile
materials have yield strength which is common in compression and tension tests
whereas brittle materials have similar ultimate tensile and compressive
strengths.
Machine
parts are subjected to biaxial and triaxial stresses also but the prediction of
failure cannot be done through tests in this case. Different theories have been
formulated for prediction of all types of stresses. The mode of failure of
ductile and brittle materials is different. The failures of members depend on
various factors like type of loads, nature of material, shape and temperature
of member. The values for failure predicted by the theories are similar to the
ones found out by the laboratory tests, which makes the theories feasible. The
principle theories of failure are as follows:-
1. Maximumprinciple stress theory (or Rankine’s theory)
2. Maximumshear stress theory (or Guest’s or Tresca’s theory)
3. Maximumprinciple strain theory (or Saint Venant theory)
4. Maximumstrain energy theory (or Haigh’s theory)
5. Maximumdistortion energy theory (or Hencky and Von Mises theory)
6. OctahedralShearing Stress theory
Note: Please click on the link to know more
about the theories.
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