Respuesta :
Answer:
The answer is "[tex]4.35 \times 10^{-3}\ mm[/tex] and 157.5 MPa".
Explanation:
In point A:
The strength of its products with both the grain dimension is linked to this problem. This formula also for grain diameter of 310 MPA is represented as its low yield point
[tex]y = yo + \frac{k}{\sqrt{x}}[/tex]
Here y is MPa is low yield point, x is mm grain size, and k becomes proportionality constant.
Replacing the equation for each condition:
[tex]y = y_o + \frac{k}{\sqrt{(1 \times 10^{-2})}}\\\\\ \ \ \ \ \ \ 230 = yo + 10k\\\\ y = yo + \frac{k}{\sqrt{(6\times 10^{-3})}}\\\\275 = yo + 12.90k[/tex]
People can get yo = 275 MPa with both equations and k= 15.5 Mpa [tex]mm^{\frac{1}{2}}[/tex].
To substitute the answer,
[tex]310 = 275 + \frac{(15.5)}{\sqrt{x}}\\\\x = 0.00435 \ mm = 4.35 \times 10^{-3}\ mm[/tex]
In point b:
The equation is [tex]\sigma y = \sigma 0 + k y d^{\frac{1}{2}}[/tex]
equation is:
[tex]75 = \sigma o+4 ky \\\\175 = \sigma o+12 ky\\\\ky = 12.5 MPa (mm)^{\frac{1}{2}} \\\\ \sigma 0 = 25 MPa\\\\d= 8.9 \times 10^{-3}\\\\d^{- \frac{1}{2}} =10.6 mm^{-\frac{1}{2}}\\[/tex]
by putting the above value in the formula we get the [tex]\sigma y[/tex] value that is= 157.5 MPa
