You are the test engineer responsible for the final production testing of an automobile (VW Golf R 2018) - create a list of tests with specifications as well as a block diagram depicting your test plan and the order in which you plan to test the car.
In: Mechanical Engineering
In regards to the Injection Moulding Process. Explain why thicker parts can be more susceptible to shrinkage ,suggest two methods to reduce the shrinkage for a given component geometry?
In: Mechanical Engineering
Why does shrinkage occur in the injection moulding process?
You can use diagrams to assist with your answers if you like.
In: Mechanical Engineering
Explain how the processing parameters for INJECTION MOULDING can influence the tensile strength for a given polymer, explain this in terms of polymer properties.
In: Mechanical Engineering
In regards to the Injection Moulding Process, discuss which polymer properties influence the MFI (melt flow index) and how the individual polymers MFI is related to the various processing parameters for injection moulding. You can use diagrams to assist with your answers if you like.
In: Mechanical Engineering
Identify the key steps in the injection moulding process, explaining how and why temperature, time and pressure are important in each step.
In: Mechanical Engineering
Quesiont is
'Explain Luder's band in detail. Make reference to the yield point, dislocation motion and solute atoms'
In: Mechanical Engineering
You are starting a new job at a plant that makes computer boards. You are responsible for putting the components on the board and also to do soldering. What should you be oriented on? What do you feel is key to your success at this new job? Why?
In: Mechanical Engineering
Define any two (i) PVC (ii) Glass Transition Temperature (iii) LDPE and (iv) Thermoplastics
In: Mechanical Engineering
A double-pipe heat exchanger is designed as an engine oil cooler. The flow rate of oil is 5 kg/s, and it will be cooled from 60°C to 40°C through annulus (ID = 0.10226 m, OD = 0.1143 m). Sea water flows through the tubes (ID = 0.02664 m, OD = 0.03340 m) and is heated from 10°C to 30°C. The number of bare tubes in the annulus is 3, and the length of the hairpin is 3 m. Assume that the tube wall temperature is 35°C. Design calculations give the number of hairpins as 85. Allowable pressure drop in the heat exchanger for both streams is 20 psi. Is this design acceptable? Outline your comments.
In: Mechanical Engineering
For a eutectoid steel, describe isothermal heat treatments that would be required to yield specimens having the following tensile strength-ductility (%RA) combinations:
(a) 900MPa and 30% RA
(b) 700MPa and 25% RA
In: Mechanical Engineering
What is the difference between superalloys and high-temperature stainless steel?
In: Mechanical Engineering
What are the materials used in an airplane engine for high-temperature purposes?
Explain the reason for using each material.
In: Mechanical Engineering
What are the most common alloying elements used in stainless steel materials?
What are the effects of each alloying elements on steel?
In: Mechanical Engineering
A squared cross- sectional bar of 3cm by 3cm is under a compressive stress of 300 MPa. The bar deforms elastically, what is the area of the cross section after deformation. Provide your answer in milimeters squared. (Do not type in the unit in your answer.) (E=30GPa, v=0.4)
In: Mechanical Engineering