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7 Sep 2001: Young's modulus measures stiffness and is a material constant, i.e. it is the same whatever the size of the test-piece.

7 Sep 2001: it is the same whatever the size of the test-piece. Many applications require stiff materials, e.g.

4 Sep 2001: Design a test to rank various materials in order of their wear resistance. ... Tip: use a very strong material to slide against your test materials.

4 Sep 2001: It is not economic to use standard processes such as turning - so another approach is needed.

4 Sep 2001: 1,140. 616. Alloy Steel. 210. 7,800. 1,330. Collect samples of many different types of rubber bands and test the amount of elongation before failure.

8 Sep 2001: Economics. Milling machines vary in price from £1,000 to £1,000,000. Milling is generally a very slow way to produce a component - but it can be economic for prototyping

8 Sep 2001: Economics. The machinery is expensive, and can cost well over £100,000 for HIPing. ... Because there is little competition, can be economic for small batches (1,000+) - although still not cheap!

8 Sep 2001: Economics. For making stock items, rolling has few competitors.For this reason, it is usually performed by the foundries before passing on to customers for further processing. ... For long shaped sections, rolling is the only viable option for larger

8 Sep 2001: However, the production rate is slow so it is only economic for one-off jobs, repair work and difficult access situations. ... Joining of sheet (e.g. car body panels) is usually more economic by other welding processes such as spot welding.

8 Sep 2001: Economics. Equipment is generally low cost, except where automation is used. ... Wave soldering is the most economic means of soldering large batches of printed circuit boards.