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Estimating the wear rate of a disc from a twin-disc experiment.
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Francis Franklin 4 years, 1 month ago
Published this.Francis Franklin 4 years, 1 month ago
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Francis Franklin 4 years, 1 month ago
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Name | Type | Generated Value |
---|
R1 | integer |
22
|
||||
R2 | number |
23.5
|
||||
Creepage | integer |
3
|
||||
omega1 | integer |
520
|
||||
omega2 | decimal |
dec("5.016351657846420332479727101785397581005e+2")
|
||||
v1 | number |
1197.9939985689
|
||||
v1_ans | number |
1200
|
||||
v2 | decimal |
dec("1.234481125428874619289340101522842639594e+3")
|
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v2_ans | decimal |
dec("1.23e+3")
|
||||
omega2_ans | decimal |
dec("502")
|
||||
rho1 | integer |
7850
|
||||
width | integer |
9
|
||||
mass1 | number |
130
|
||||
cycles | integer |
200000
|
||||
dR1 | rational |
11/50
|
||||
dmass1 | number |
2.14
|
||||
wear | rational |
11/10
|
||||
wear_calc | number |
1.1011545361
|
||||
wear_ans_lo | number |
1.10
|
||||
wear_ans_hi | number |
1.11
|
Generated value: integer
- dmass1
- mass1
- v1
- wear_calc
- Advice
- "Unnamed part" - prompt
Gap-fill
Ask the student a question, and give any hints about how they should answer this part.
A twin-disc test is performed to assess the wear characteristics of a new alloy under rolling-sliding contact. Disc 1 is the new alloy, and has radius {R1}mm, initial mass {mass1}g and density {rho1}kg/m3. Disc 2 has radius {R2}mm. Both discs have running width {width}mm. The test lasts for {cycles} cycles - one cycle is one full rotation of Disc 1. The speed of Disc 1 is fixed as {omega1} r.p.m. (revolutions per minute) and a creepage of {creepage}% is maintained throughout.
- The surface speed of Disc 1 is
v1 mm/s. - The surface speed of Disc 2 is
v2 mm/s. - The angular speed of Disc 2 is
omega2 r.p.m.
Following the test, the mass of Disc 1 is measured again, and the mass has reduced by {dmass1}g.
- The average wear rate of Disc 1 (i.e., depth of material removed per cycle) over the test is
wearrate nm/cycle.
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