Question

Explain to a colleague the basis for the ASTM Grain size number?

Answer #1

ASTM grain size number is equation relating number of grains per in² at 100X. The equation is

n= 2^{G-1}

Where n is the number of grains per in² at 100X and G is the ASTM grain size number.

ASTM grain size number is calculated by

G = 3.321928 logNa - 2.954

Where Na is the number of grains per mm² at 1X and G is rounded off to nearest tenth value.

ASTM grain size number was introduced in 1951 by an undocumented timken member of E-4 Committee when E91- 51T was introduced.

In a 1 square inch area on a 200X micrograph you count 11
grains. Calculate the ASTM grain size number. (The ASTM grain size
number should be accurate to two decimal places.)
Correct Answer: 2.34 +/- 2%
In a 1 square inch area on a 200X micrograph you count 24
grains. Calculate the ASTM grain size number. (The ASTM grain size
number should be accurate to two decimal places.)
Correct Answer: 2.68 +/- 2%
*******BOTH OF THESE ARE CORRECT. HOW...

Be prepared to
arrange common biological objects in order by size. Explain if
needs.
1. Grain of Rice
2. Grain of Salt
3. Amoeba Cell
4. Yeast Cell
5. Human Egg Cell
6. Skin Cell
7. Sperm Cell
8. Red Blood cell
9. X Chromosome
10. Mitochondrion
11. E. coli Bacteria Cell
12. Virus
13. Ribosome
14. Hemoglobin Molecule
15. Phospholipid Molecule
16. Adenine Molecule

8. A colleague of
yours is struggling to make a decision on sample size. What advice
would you provide to your colleague in terms of larger or smaller
sample sizes? Why?

The yield stress of a metal sample with very large grain size
was 20 MNm-2, whereas the yield stress of an otherwise
identical sample with grain size 4 µm was 120 MNm-2.
Explainwhy te yield stress increased in this way. Estimate the
yield strength of the same metal sample with grain size of 10
µm.

Describe the detail the process for obtaining a very large grain
size in a metal by deformation and annealing .

Determine the percent finer than each sieve size and plot the
grain size- distribution curve.
Determine the values of D60, D30, and D10 for the grain-size
distribution curve.
Calculate the uniformity coefficient Cu and the coefficient of
gradation Cg.
Comment on the degree of gradation (i.e., whether the soil is
well graded, poorly graded, or gap graded, etc.)
Sieve #
Mass of Soil Retained on each Sieve (gram)
4
0
10
27
20
58
40
112
60
136
80
144...

Assume that strengthening of a low-carbon steel is achieved by
grain size refinement AND by fine carbide dispersions. Uniaxial
tensile tests show that the tensile yield stress ?y=379.5 MPa when
the grain diameter d is 0.32 mm, and ?y=276 MPa when d=1.0 mm. The
shear modulus G=118 GPa and b=2 Å. What is the average distance
between the particles?

Write
about the following:
Texture of single crystalline material, grain size, effect of
temperature on x ray
intensity, structure factor.

1-which one does not correspond to mechanism
strengthening?
a-alloying or dopping with impurities
b-grain-size reduction
c-grain growth
d-strain hardening
2-in polycrystals, the grains with the lowest resolved shear
stress always yields firts.
true or false
3-resolved shear stress is the result of the application of simple
shear stress to a piece of material.
true or false
4-decrease on strain hardening?
a-percent enlogation
b-elastic modulus
c-yield strenght
d-hardness
5-which term is different from other options?
a-strain hardeninh
b-dislocation hardening
c-cold working...

Explain how number of subjects, effect-size, and statistical
power are related.
- Imagine there is a true effect, state how increasing the
number of subjects can influence statistical power?
- If the number of subjects are held constant, state how an
increase in the size of the true effect influences statistical
power.
- Explain how the type II error rate is different from the type
I error rate.
- State how increasing statistical power influences the type II
error rate.

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