Friction-Report-Sheet-Phys100-OL (1)

Could I please get some help with this problem and the key concepts, please and thank you

Please solve no 4 (engineering tribology)

Q1: How do your results for μs and μk compare to literature values for dry metal on plastic? Cite what you compared to. Do they agree with the literature within error? If not, discuss any systematics that could have contributed to the discrepancy. Q2:  Is the force of static friction constant as the incline rises? Explain your answer. My Us value is 0.4452, and Uk value is 0.33

B7

No wrong answer please , i could downvote The piece of suture is tested for its stress relaxation properties after cutting 3 cm long sample with a diameter of 1mm. The initial force recorded after stretching 0.1 cm between grips was 5 Newtons. Assume the suture material behave as if it has one relaxation time. The gage length was 1 cm. a. Calculate the initial stress. b. Calculate the initial strain. c. Calculate the modulus of elasticity of the suture if the initial stretching can be considered as linear and elastic. d. Calculate the relaxation time if the force recorded after 10 hours is 4 Newtons.

What are the important factors to take into consideration when solving problems related to friction (Dry or Coulomb friction)?

Q1) The redesigned brake caliper is manufactured using SLM from Titanium Ti6Al-4V alloy powder. How many SLM machines are required to manufacture parts for 450 vehicleswhich are to be built in a 20-month production period. The following parameters are in effect:• A single caliper is built at a time• The caliper has a height of 173mm.• Each layer is 32 µm thick• Only one laser is used• The average laser scanning time for each layer with a single laser is 63 seconds• The powder recoating time for every odd numbered layer is 12 seconds and 25 for every evennumbered layer• Every 8th layer is scanned twice, at 2.3 times the usual laser scan speed to provide additional heatinput for in-situ heat treatment• The SLM machine operates at a duty rate of 42% of the 24-hour day, Monday to Friday, for 48 weeksof the year, with 10% of production time lost to unscheduled downtime.

3) Forging: A cylindrical specimen made of annealed 4135 steel (K = 1015 MPa, n = 0.17) has a diameter of 150 mm, and is 100 mm high. It is upset between dies to a height of 50 mm at room temperature. Calculate the work done for 2 cases: a) Ideal (frictionless) b) Friction, where the coefficient of friction is 0.2. Set up on paper and solve using software. Be careful with units.

Please explain solution.

Statics of Rigid Bodies Note: I will report you if you answer this post multiple times so please follow it.Thank you for understanding, Tutor! Content Covered: - Friction Direction: Solve the problem below by giving the complete solution. In return, I will give you a good and high rating. Thank you so much! Note: Be careful with the calculations in the problem. Kindly double check the solution and answer if there is a deficiency. And also, box the final answer. Thank you so much!

a) During sliding of a cylindrical steel pin against a steel disc in a pin-on-disc test in air, the coefficient of friction is initially around 0.7, but then falls to 0.5 as the test proceeds. At the end of the test, the wear track on the disc is rough and black in colour, with a black powder on the disc surface outside the wear track; chemical analysis of the wear track shows a high oxygen level. (b) A test identical to that described in part (a) is conducted, but this time the test is conducted in vacuum. The coefficient of friction remains high through the test, the wear volumes are much greater, and the track on the disc surface following the test is very rough and silvery in colour. (c) A test identical to that described in part (a) is conducted, but this time the test is conducted in air at 300 ◦C. At the end of the test, the wear track on the disc is very smooth (shiny) and black in colour, with no debris on the disc surface outside the weartrack; chemical analysis of the wear…

2. Sharp notches are often added to plastic food packages to help open them (along with arrows indicating where they should be torn). Why do they do this, and why is it sometimes very hard to open them without this notch? Would it be harder or easier to open with a semi-circular notch and why? YY (ENISH) TOMATO 10 ATE TOMATE CONCENTRATE FRO NUSARY Heins