Linear-elastic fracture mechanics method for fatigue life estimation is more appropriate for which stage(s) of fatigue?

a.Why might a single crystal ceramic material have different coefficients of linear expansion depending on the crystallographic direction (anisotropy)?

b. In metals, thermal expansion and electrical conductivity may be related using equation the Weidemann-Franz law. Why is it possible to relate these two phenomena in this way for metals and why does this relation not hold for ceramic and polymeric materials?

A hollow cylinder of ID 0.12 m and OD 0.14082 has a heat generation rate of 5 × 106 W/m3.
The conductivity of the material is 30 W/mK. The outside surface is insulated and heat is
removed by convection over the inside surface by a fluid at 130°C with a convection coefficient
of 226.26 W/m2K. Determine the temperature on the outside surface.

When reporting gait and/or kinematics data, authors report a continuous graph of the average and standard deviation. Research how this type of graph is created and write up a tutorial on how to create these types of graphs

A mixture of dry air and water vapour is at a temperature of 25C. It is under a pressure of 100kPa. The dew point temperature is 15C. What is:

a) Partial pressure of the water vapour?

b) Relative humidity?

c) Specific humidity?

d) Specific volume of the dry air?

Isooctane is supplied to a four-cylinder spark-ignition engine at 2 g/s. Calculate the air flow rate for stoichiometric combustion. If the engine is operating at 1500 rev/min, estimate the mass of fuel and air entering each cylinder per cycle. The engine displaced volume is 2.4 liters. What is the volumetric efficiency?

Name two sources of renewable energy that you know and one way of harvesting and storing energy from one of them. Make your own sketch of the process and label the components that will be involved .

Whether you are doing area sampling with a large, heavy, high-volume, variable-speed pump or personal sampling with a small, light-weight, lower volume, variable-speed pump attached to the worker’s belt, what two procedures are critical for proper operation of the pump for sampling (and do not use “connect to power” or “connect the tubing”) for a specific contaminant?

Consider an ideal gas-turbine cycle with two stages of compression and two stages of expansion. The pressure ratio across each stage of the compressor and turbine is 3. The air enters each stage of the compressor at 300 K and each stage of the turbine at 1200 K. Determine the back work ratio and the thermal efficiency of the cycle, assuming (a) the expansion and compression processes to be isentropic and no regenerator is used, (b) the expansion and compression processes to be isentropic and a regenerator with 75 percent effectiveness is used, (c) assuming an efficiency of 84 percent for each compressor stage and an efficiency of 88 percent for each turbine stage and no regenerator is used, and (d) assuming an efficiency of 84 percent for each compressor stage and an efficiency of 88 percent for each turbine stage and a regenerator with 75 percent effectiveness is used. Use enthalpy values from the property tables to solve this problem.

1. Design and check for stability for a square and ground end helical spring subjected to a maximum force of 1300 N supported between flat surfaces. The deflection of the spring corresponding to the maximum force should be approximately 25mm. The material used for the spring is cold drawn steel wire with ultimate tensile strength, modulus of elasticity and rigidity of 1090, 207000 and 81730 MPa, respectively. Assume and state relevant parameters.

A spring was compressed by varying load from 100N to 350N. If the spring material is music wire, design the spring specifications and indicate its factor of safety against fluctuating stresses.Assume and state relevant parameters.

A rock is dropped from the top of a tall tower. Half a second later another rock, twice as massive as the first, is dropped. Ignoring air resistance,

15.33 A spur gear reducer has an 18-tooth pinion driven 1500 rpm by an electric motor and a 36-tooth gear that drives a load involving “moderate shock.” A life of 106 pinion revolutions is required, and the transmitted load, Ft, is 100 lb (this figure includes a
safety factor of 2). Conditions are such that Km = 1.8 and kt = 1. It is proposed that standard 20° full-depth gears be used, with both pinion and gear teeth being cut with a low-cost, average-quality, form-cutting process from steel of 235 Bhn for the gear and 260 Bhn for the pinion. Diametral pitch is to be 10, and face width 1.0 in. Estimate the reliability with respect to bending fatigue failure.

What is the aluminum profile? What is the manufacturing method of aluminum profile? What are the materials used in the manufacture of the product? Describe them all in detail. Please keep the explanations long!!!