1. What is the limitation of first law of thermodynamics . 2. Which theory of failure is applicable in case of uniaxial tensile testing machine .

Question

Accepted Answer

Limitation of first law of thermodynamics and theory of failure in uniaxial tensile testing machine

The first law of thermodynamics does not provide information about the direction of a process, only the energy change
It does not account for factors such as entropy and irreversibility
Theory of failure applicable in uniaxial tensile testing machine is Maximum Principal Stress Theory
This theory states that failure occurs when the maximum principal stress in a material exceeds the ultimate tensile strength

Accepted Answer

It does not forbid the probability of a process if law of conservation is true which does not happen in actual practise and requires increse of entropy or its constancy for a natural process to occur . I could not answer properly because of longer duration to remember it during the short interview time . So one should prepate for interview.

1. What is the limitation of first law of thermodynamics . 2. Which theory of failure is applicable in case of uniaxial tensile testing machine .

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