(a) Brine (b) Brinell 10 10 Brinell (c) 10 (d) Brinell DPH (e) Vickers DPH Vicke
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Question
(a) Brine (b) Brinell 10 10 Brinell (c) 10 (d) Brinell DPH (e) Vickers DPH Vickers DPH (g) Vickers DPH (h) Vickers Knoop Tukon Knoop Tukon TIME. 7. Can a scleroscope hardness be related to a Brinell PROP hardness test? Why or why not? C8. what individual applications are the Brinell, Impact Rockwell, Vickers, or scleroscope tests best suited? 9. Give at least three examples in which the hard Whereas the t ness of a material should be known before a part shear strength is manufactured from it. mined in a ste mined by a suc 10. Which hardness test (s) would be suitable for state test, the measuring sheet metals? until the mate 11. What is the difference between density and spe- material may cific gravity? strength if th 12. If a part weighs 22.4 g and displaces 3.5 mL of instant. A clas water, what is its density in grams per cubic cen- Silly Putty. Sil timetre? What is its specific gravity? thread if gent 13. If a cylindrical bar has a diameter of 1.5 in., is 3.25 will snap in a in. long, and weighs 0.87 lb, what is its density in behave simila pounds per cubic inch? in a few micro 14. The specific gravity of nickel is 8.9. What is its The speed density in grams per cubic centimetre? What is its the strain rate density in pounds per cubic foot? metres per m 15. Consider the specific gravity of the following metals units. The rat most ductile aluminum 2.7 depends on th stretched at e antimony 6.7 critical tempe cadmiumExplanation / Answer
Solution for problem 8:
Brinell hardness is used to test a material that have a structure that is too coarse or that have a surface that is too rough to be tested using another test method.For example : Castings and forging materials.
The rockwell hardness test method is the most commonly used hardness test method. The rockwell test is generally easier to perform and more accurate than other types of hardness testing methods.It is used on all metals,except in the condition where test metal structure or surface condition would introduce too much vibration or where the indentations would be too large for the application or where the sample size or sample shape prohibits its use.
The vickers hardness test method is also referred to as microhardness test method,is mostly used for small parts,thin sections or case depth work.The microhardness methods are used to test on metals,ceramics,composites-almost any type of material.Since the test indensions are very small in Vickers test,it is useful in verity of applications:testing very thin materials like foils or measuring the surface of a part,small parts or small areas,mesuring individual microstructure or measuring the depth of case hardening by sectioning a part and making a series of Indentations to describe a profile of the change in hardness.The vickers method is more commonly used.
Scleroscope Test:This test consists of dropping a diamond tipped hammer,which falls inside a glass tube under the force of its own weight from a fixed height,onto the test specimen.The height of the rebound travel of the hammer is measured on a graduated scale.The scale of the rebound is arbitrarily chosen and consists on shore units,divided into 100 parts,which represent the average rebound from pure hardened high carbon steel.the scale is continued higher than 100 to include metals having greater hardness.In normal use the shore scleroscope test does not mark the material under test.The shore scleroscope mesures hardness in terms of the elasticity of the material and the hardness number depends on the height to which hammer rebounds,the harder the material, the higher the rebounds.Advantage of this method are portability and non marking of the test surface
Soution for Problem 10:
The rockwell hardness test mentod is the most common method used for checking hardness in sheet metal.The rockwell test method is used on all metals except in condition wherethe test metal structure or surface conditions would introduce too much variation;where the indentations would be too large for the application or the sample shape or sample size prohibits its use.
PROBELM SET 2-2
Solution for problem 2
If the hardness of the knife blade is 58 (RC-Rockwell Hardness) then it is harder steel which hod an edge better than softer steel but it is less durable and more prone to chipping or even breaking.The softer steel is more durable but wont maintain an edge for as long as the harder steel.
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