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masya89 [10]
3 years ago
14

Entropy change is evaluated using Eq. 6.2a based on an internally reversible process. Can the entropy change between two states

of a system be determined for any process linking the two states whether reversible or not?

Engineering
1 answer:
Vadim26 [7]3 years ago
4 0

Answer:

YES

Explanation:

Entropy is an extensive property of the system entropy change that value of entropy change can be determined for any process between the states whether reversible or not. i have attached the formula to calculate entropy change which is independent of whether the system is reversible or not and can be determined for any process.

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A material has the following properties: Sut = 275 MPa and n = 0.40. Calculate its strength coefficient, K.
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The strength coefficient is K = 591.87 MPa

Explanation:

We can calculate the strength coefficient using the equation that relates the tensile strength with the strain hardening index given by

S_{ut}=K \left(\cfrac ne \right)^n

where Sut is the tensile strength, K is the strength coefficient we need to find and n is the strain hardening index.

Solving for strength coefficient

From the strain hardening equation we can solve for K

K = \cfrac{S_{ut}}{\left(\cfrac ne \right)^n}

And we can replace values

K = \cfrac{275}{\left(\cfrac {0.4}e \right)^{0.4}}\\K=591.87

Thus we get that the strength coefficient is K = 591.87 MPa

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