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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.

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Mechanical properties of materials mm m 2 20

Mechanical Properties of MaterialsMMM 220

Ali Osman Kurt (M.Sc. and Ph.D. in Materials Science)

www.aokurt.sakarya.edu.tr

Test Methods


Introduction relationship s in materials science

Processing

Structure

Properties

IntroductionRelationships in Materials Science


Properties

are evaluate by

Properties

TESTING

Properties

named as

tension, compression, hardness, bending, torsion, high strain rate, creep, fatigues, fracture, corrosion, formability, wear, and some others.


Testing
Testing

  • Each test should / may be carried out according to a standard, i.e. a set of instruction to follow in order to obtain data useful to drive the materials properties.


Sample tension testing
Sample: Tension Testing

“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.


Tension testing and results
Tension Testing and Results


Sample hardness testing
Sample: Hardness Testing

“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.


Hardness testing brinell
Hardness Testing - Brinell

Brinell hardness test:

A hard steel ball (usually 10 mm in diameter) is used.

3000 kg – Cast iron and steel

500 kg – Nonferrous alloys


Hardness testing rockwell
Hardness Testing - Rockwell

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


Hardness testing vickers
Hardness Testing - Vickers

Vickers hardness test

is a microhardness test. A diamond pyramid (136o) is used for indentation.

10 kg – Hard materials (such as ceramics)


Conclusions
Conclusions

  • Materials properties are effected by its structure and processing method(s).

  • Required properties are checked by a set of pre-determined instructions, which are formally named standard for testing.


End of The Section


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