Material Properties [Compatibility Mode]

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MATERIAL PROPERTIES

(SIFAT‐SIFAT BAHAN)

Materi kuliah bahan teknik

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‐

•   ‐

material yang

 meliputi

 :

 –    ‐

 –  Mechanical   ‐ Aesthetic

 –    ‐

 –  Electrical

 –    agne c –    Enviromental

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 No Ability   •   Properties

1 Economic   •   Price and availability•   Recyclability

2 General Physical   •   Density

3 Mechanical   •   Modulus•

  Yield and tensile strength•   Hardness•   Fracture toughness•   Fatigue strength•  •   Damping

4 Thermal   •   Thermal conductivity•   Specific heat•  

5 Electrical and Magnetic   •   Resistivity•   Dielectric constant•   Magnetic permeability

6 Environmental   •   Oxidation

Interaction   •   Corrosion•   Wear

7 Production   •   Ease of manufacture•   J oining•   Finishing

8 Aesthetic   •   Colour•   Texture•   Feel

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The definitions

 of 

 stress

 strain

 and

 elastic

 moduli

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Tensile stress–strain curves for 

ceramics, metals

 and

 polymers.

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 – 

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The modulus–relative cost chart. (The CES 

software contains material rices regularly updated.)

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Metal

Glass

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Measuring heat capacity, Cp. Its units 

are  J kg.K.

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Measuring the thermal expansion coefficient, α. 

Its units are 1 K or more usually, 106/K (microstrain/K).

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Measuring the thermal conductivity,  λ. 

Its units are W m  K.

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The linear expansion coefficient, α ,  plotted  against  the thermal  

conductivit   λ.The contours show the thermal distortion parameter  λ / α.

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The thermal conductivity,  λ ,  plotted  against  the thermal  

di usivit   a  λ   C .The contours show the specific heat per unit volume  ρCp.

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Domains allow a compromise: the cancelation of  the external field while

retaining magnetization of  the material itself. The arrows show the direction

of  magnetization.

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Saturation magnetization and susceptibility for 

so t magnet c

 mater a s

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Optically flat, reflective surfaces give specular 

re ect on, suc

 t at

 .

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Oxidation mechanisms. (a) Growth by metal diffusion 

and 

electron 

conduction(b) Growth by diffusion of  oxygen and holes

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The material–process compatibility matrix for shaping,  joining and finishing

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