chapter3 - CHAPTER 3 PHYSICAL PROPERTIES OF MATERIALS 3-1...

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Unformatted text preview: CHAPTER 3 PHYSICAL PROPERTIES OF MATERIALS 3-1 EBLE 3.1 Phy sical Properties of Selected Materials at Room Temperature Thermal Metal Aluminum Aluminum alloys Beryllium Cdumfium(MoMum) Copper Copperanoys Iron Steels Lead. Leadanoys Magnesium hdagnefiunianoys Molybdenum alloys Nickel Nickel alloys Tantalum alloys Titanium Titanium alloys Tungsten Zinc Density (kglm’) 2700 2630—2820 1854 3580 3970 7470—8940 7860 6920—9 130 l 1.350 3850—l 1.350 1745 1770—1780 10.210 8910 7750—8850 16.600 4510 44304700 l9.290 7140 6640—7200 Melting point l°Cl 660 476-654 l273 2468 [082 885-1260 [537 l37l—1532 327 l82-326 650 610-621 2610 l453 lllD—l454 1996 1668 1549-1649 3410 419 386—525 Specific heat (J/kg K) 900 330—920 1884 272 385 377-435 460 448—502. l30 [26—1 88 l025 1046 276 440 33 l—Sd—l» HE 519 502,544 l38 385 402 conductivity (W/m Ki 1"“, ill-139 iii-453 l7 S-l’l [66 H3 105+l 13 Zinc alloys _____..__—- Nonmetallic Ceramics Glasses Graphite Plastics 2300—5 500 2400—2700 1900-2200 900—2000 400—700 580—l540 l [0—330 _. 750—950 500—850 840 WOO—1000 2400—2800 10—17 0.6-1.7 5—l0 0.1-0.4 0.1—0.4» Wood TABLE 32 # PHYSICAL PROPERTIES OF MATERIALS. IN DESCENDING ORDER MELTING SPECIFIC THERMAL THERMAL ELECTRICAL DENSITY POINT HEAT CONDUCTIVITY EXPANSION CONDUCTIVITY Platinum Tungsten Wood Silver Plastics Silver ISold Tantalum Beryllium Copper Lead Copper Tungsten Molybdenum Porcelain Gold Tin Gold “Tantalum Columbium Aluminum Aluminum Magnesium Aluminum Lead Titanium Graphite Magnesium Aluminum Magnesium Silver iron Glass Graphite Copper Tungsten Molybdenum Beryllium Titanium Tungsten Steel Beryllium Copper Copper Iron Beryllium Gold Steel Steel Gold Copper Zinc Ceramics Tin Titanium Silver Molybdenum Steel Glass Graphite Aluminum Aluminum Tungsten Tantalum Tungsten Ceramics Beryllium Magnesium Lead Ceramics Glass Glass Lead Titanium Plastics Magnesium , Tin Glass Quartz Plastics Plastics Plastics ____________________——’—————- (a) o 2.5 5.0 7.5 Graphite/epoxy Boron/epoxy Glass/epoxy Titanium Steel Aluminum 0 1 2 3 Tensile strength/density (in. x 106) m x 106 (b) 0 5 10 15 Gra hire/e oxv .. Swim/ape; ' FIGURE 3.1 Specmc Beryllium strength (tensile Glass/epoxy strength/density) and Titanium specific stiffness (elastic Steel modulus/density) for Aluminum various materials at room temperature. (See also 0 1 2 3 4 5 6 Chapter 9.) Source: M.J. Elastic modulus/density (in. x 103) Salkind. 3-4 Melting Point: Is a function of the energy required to separate the material’s atoms Specific Heat The energy required to raise the temperature of a unit mass of a material one degree Thermal Conductivity The rate at which heat flows within and through a material Thermal Expansion Coefficient of thermal expansion 3-5 Electrical Conductivity mho/ft Electrical Resistance ohm Corrosion Surface deterioration Example: Aluminum Wiring in homes 3-6 ...
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