Mechanical Properties of Materials MM M 2 20. Ali Osman Kurt (M.Sc. and Ph.D. in Materials Science) www.aokurt.sakarya.edu.tr. Test Methods. Processing. Structure. Properties. Introduction Relationship s in Materials Science. are evaluate by. Properties. TESTING. Properties. named as.
Ali Osman Kurt (M.Sc. and Ph.D. in Materials Science)
PropertiesIntroductionRelationships in Materials Science
tension, compression, hardness, bending, torsion, high strain rate, creep, fatigues, fracture, corrosion, formability, wear, and some others.
“Tension Testing consists of subjecting a prepared specimen of special size and shape, or a full-size specimen, to a gradually increasing uniaxial load (stress) until failure occurs.”1
1: C.S. Barrett, Crystal Structure of Metals, ASM Handbook, Volume 8, Metallography and Microstructures, ASM International, 1990, in ASM Handbook on DVD, ASM International and The Dialog Corporation, 1999.
“Hardness test is the measures of the material to penetration by a sharp object”1”
Common hardness tests are
Brinell, Rockwell and Vickers.
1: Donald R. ASKELAND, "The science and engineering of materials“, 3rd Edi., p147, 2003.
Brinell hardness test:
A hard steel ball (usually 10 mm in diameter) is used.
3000 kg – Cast iron and steel
500 kg – Nonferrous alloys
Rockwell hardness test:
A diamond cone (120o) and hard carbide (or steel balls) usually 1/16 in. (1.5875mm) or 1/8 in. (3.175mm) in diameter are used.
RA – 60 kg – Very hard materials
RB – 100 kg – Brass, low strength steels
RC – 150 kg – High-strength steels
RD – 100 kg – High-strength steels
RE – 100 kg – Very soft materials
RF – 60 kg – Al, soft materials
Vickers hardness test
is a microhardness test. A diamond pyramid (136o) is used for indentation.
10 kg – Hard materials (such as ceramics)
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