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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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