Consider the following extract from a Materials Data Sheet G

Consider the following extract from a Materials Data Sheet. Grade 301 is a high work-hardening rate austenitic stainless steel. It can be supplied with a tensile strength of up to over 1300 MPa in strip and wire forms, to produce tempers in the range of 1/16 hard to Full Hard. The controlled analysis of Grade 301 enables it to retain sufficient ductility in conditions up to 1/2 Hard... Five phrases or words are underlined (high work-hardening rate; austenitic stainless steel; tensile strength; tempers; ductility). Choose any three of these, and explain the meaning of each. Use diagrams where necessary. (c) If 0.5%C is added to pure iron, do you expect the resulting alloy to be stronger or less strong? Why? (d) A large billet of 0.6%C steel is cold rolled, reducing its thickness by 50%. Do you expect this to result in an increase or a decrease In strength? Why? (e) A 0.8%C steel is heated to 800degree C, followed by rapid quenching. Do you expect it to be stronger or less strong, as a result of this? Why? (f) Aluminium alloys used in building an aircraft fuselage, must not be joined by welding. Explain why this is the case.

Solution

The loaded four wheel trailer shown in Figure P8.10 has a total mass of 5t and is pulled along a level road. Average resistance to motion (friction and windage) is 2 per cent of the total weight and acts at the same horizontal level as the applied force P. Determine the normal reaction at each of the front and rear wheels when the trailer moves:

a) at constant velocity

b) with forward acceleration 1.5m/s².

(Average resistance to motion is 2% of total weight is not required.)