Mechanical Engineering - Machine Design - Discussion

Discussion Forum : Machine Design - Section 4 (Q.No. 50)
50.
If a shaft made from ductile material is subjected to combined bending and twisting moment, calculations based on which one of the following failure theories will give the most conservative value?
Maximum principal stress theory
Maximum shear stress theory
Maximum strain energy theory
Maximum distortion energy theory
Answer: Option
Explanation:
No answer description is available. Let's discuss.
Discussion:
21 comments Page 1 of 3.

Mahesh said:   1 year ago
Answer is D.

When a shaft made from ductile material is subjected to combined bending and twisting moments, the theory of maximum distortion energy usually provides the most conservative estimate of failure. This theory takes into account both the normal and shear stresses to determine the critical failure condition.
(1)

Atanu Pal said:   2 years ago
Actually.
All Theories are Failure material. (Ductile/Brittle)

So
Maximum Principal stress theory Failure Brittle Material.
and Maximum shear stress Theory Failure Ductile Material.

Then;
Noted the Point;
1. Ductile Material.
2. Will Give the Most Conservative Value.

Ductile materials are no Failure which Theory (Conservative Ductile Material)

Maximum Principal Stress Theory is Ductile material Most Conservative (No failure).
Brittle Material Failure (Non-Conservative).

That's why the answer is Option ( A).
(1)

Temesgen Ababu said:   3 years ago
Option D is the right answer, maximum distortion energy theory is applicable.

Sandip said:   4 years ago
B is the correct answer.

Rajkotha said:   4 years ago
In question, there are two points that need to be noted.

1. Ductile. 2. Most conservative.

Hence for ductile with the most conservative maximum principal stress theory is to be considered.

Vinay BEL said:   5 years ago
Maximum shear stress theory is the right one.

Sunny said:   5 years ago
The correct answer is option B.
(1)

Murli said:   5 years ago
B is the correct answer.
(1)

Zeeshan bashir said:   6 years ago
Most efficient criteria for ductile material is von mises.
(1)

Anonymous said:   7 years ago
The principle stress theory is for brittle material.

The principle shear stress theory is specifically for a ductile material.

So, the correct option is B.


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