Table of Contents
- 1 Why the maximum principal or normal stress theory is used for brittle materials?
- 2 Where do you use maximum principal stress theory of failure?
- 3 What is the theory of failures explain maximum principal stress theory and maximum shear stress theory?
- 4 Which theory is used for designing ductile materials?
- 5 Why do we need failure theory?
Why the maximum principal or normal stress theory is used for brittle materials?
Brittle fracture in tension is considered to be due to the normal tensile stress alone and thus the maximum normal-stress theory is applicable in this case. Brittle fracture in compression is due to some combination of normal compressive stress and shear stress and requires a different theory of failure.
Where do you use maximum principal stress theory of failure?
Maximum principal stress theory is quite suitable for securing the safe design of machine component made of brittle material as brittle materials are weak with respect to tension.
For which shaft maximum principal stress theory is used?
Maximum Shear Stress Theory MCQ Question 4 Detailed Solution Maximum Shear Stress Theory and Maximum Distortion Energy Theory are used for Ductile materials.
For which materials do we apply max principal stress theory?
4.6
| Theory | Suitable Material |
|---|---|
| Maximum Normal Stress Theory Or Maximum Principal Stress Theory Or Rankine’s Theory | Brittle material |
| Maximum Normal Strain Theory Or Maximum Principal Strain Theory Or St.Venant’s Theory | Ductile and brittle material but results are not accurate in both |
What is the theory of failures explain maximum principal stress theory and maximum shear stress theory?
“The maximum shear stress theory states that the failure or yielding of a ductile material will occur when the maximum shear stress of the material equals or exceeds the shear stress value at yield point in the uniaxial tensile test.”
Which theory is used for designing ductile materials?
Maximum Shear Stress Theory (Tresca theory), Total strain energy theory, Maximum Distortion Energy Theory (von Mises) useful for a ductile material.
Which is more conservative von Mises or Tresca?
The Tresca theory is more conservative than the von Mises theory. It predicts a narrower elastic region. The Tresca criterion can be safer from the design point of view, but it could lead the engineer to take unnecessary measures to prevent an unlikely failure. Von Mises versus Tresca criteria in a 2D system.
For what type of materials is the maximum normal stress criterion useful when predicting failure?
The maximum stress criterion, also known as the normal stress, Coulomb, or Rankine criterion, is often used to predict the failure of brittle materials. where s1 and s2 are the principal stresses for 2D stress.
Why do we need failure theory?
Theories of failure are those theories which help us to determine the safe dimensions of a machine component when it is subjected to combined stresses due to various loads acting on it during its functionality.