What is the effect of time and temperatuure on the mechanical properties of polymers (in regards to polymer chains)?

To what temperature would you need to heat the carbon steel rivets to ensure the plates developed sufficient compressive force to transmit the load in shear. The force the joint is required to carry is 20,000 lbs. The plates are to be used for retaining walls below the permafrost depth, so their operation temperature will be 52 F. The clamped plates are made of steel and have
clean and dry surfaces. Please show all work

Which of the following is not the charecterstic of Pallet loads placed on racks in multi-rackStructure: Select one: a. Good accessibility b. Low cost c. None of these d. Good stroge density

Consider a 1.5m long 30cm wide flat plate exposed to two laminar flows of air (6 m/s free stream top surface and 12m/s free stream bottom surface) at 25ºC and atmospheric pressure. The top and bottom surfaces of the plate are electrically heated (1.5 kW total power, heaters assumed infinitesimally thin). The plate consists of 3 layers: a top and bottom layer of 1.0 cm balsa wood (k = 0.055 W/(m·K)), and a middle layer of 2.0 cm plywood (k = 0.12 W/(m·K)). Assume all of the following conditions apply: a) the generated surface heat flux on the top and the bottom surfaces of the plate is uniform; b) the heat is transferred by convection on both sides of the plate; c) radiation heat transfer is negligible; and d) heat transfer is one-dimensional through the plate and no heat is transferred along the plate. Assume transition occurs at Rex=30,000 for this plate.

•Calculate and plot the expected top, bottom and center temperatures in °C as a function of distance from the leading edge of the plate.

Research and write a recommendation report that compares two or more things. Address a topic or issue of your major field of study.

An FCC crystal is pulled in tension along the [100] direction. (a) Determine the Schmid factor for all slip systems. (b) Identify the slip system(s) that would be activated first. (c) What is the tensile stress under which this crystal will flow plastically? (τo = 50 MPa)

In a slowly cooled hypereutectoid iron-carbon steel,
the pearlite colonies are normally separated from each
other by a more or less continuous boundary layer of
cementite. Explain how this microstructure develops. Use
simple sketches to illustrate your answer

In slowly cooled hypoeutectoid steels one normally finds a microstructure in which the pearlite colonies are surrounded by ferrite grains. Explain.

Problem 7.56

A three-point bending test was performed on an aluminum oxide specimen having a circular cross section of radius 4.7 mm; the specimen fractured at a load of 3740 N when the distance between support points was 44 mm. Another test is to be performed on a specimen of this same material, but one that has a square cross section of 11 mm in length on each edge. At what load would you expect this specimen to fracture if the support point separation is maintained at 44 mm?

Article on leadership and related to mechanical engineering.

The rate of emission of SO₂ from the stack of a power plant is 150 gm/sec. The stack height is 50 m. Calculate the effective plume height on a sunny September day when the wind velocity is 5 m/sec. Use Class B stability. The effluents are being released at 10m/s and at a temperature of 310^oK. The atmospheric temperature is 293^oK. The stack diameter is 0.5 m

I need to Elaborate a thermodynamic analysis of energy and efficiency of traditional and Perovskite solar cells. Can I get Help with this?

Calculate the maximum mass flow possible through a frictionless, heat-insulated, convergent nozzle if the entry or stagnation conditions are 5 bar and 15°C and the throat area is 6.5 cm2. Also calculate the temperature of the air at the throat. Take cp = 1.00 kJ kg−1 K−1 and γ = 1.4.