Unit 4
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Catégorie :Category: nCreator TI-Nspire
Auteur Author: KTS.A7
Type : Classeur 3.0.1
Page(s) : 1
Taille Size: 7.09 Ko KB
Mis en ligne Uploaded: 12/02/2025 - 13:18:52
Uploadeur Uploader: KTS.A7 (Profil)
Téléchargements Downloads: 3
Visibilité Visibility: Archive publique
Shortlink : http://ti-pla.net/a4502122
Type : Classeur 3.0.1
Page(s) : 1
Taille Size: 7.09 Ko KB
Mis en ligne Uploaded: 12/02/2025 - 13:18:52
Uploadeur Uploader: KTS.A7 (Profil)
Téléchargements Downloads: 3
Visibilité Visibility: Archive publique
Shortlink : http://ti-pla.net/a4502122
Description
Fichier Nspire généré sur TI-Planet.org.
Compatible OS 3.0 et ultérieurs.
<<
Ï 4.1 Materials and their Properties Ë Hardnessthe ability of a material to withstand scratching Ë Physical Propertiesrefer to the actual matter that forms the material Ë Mechanical Propertiesproperties that determine how a material reacts to external forces Ë Thermal Conductivityhow easily heat energy can pass through a material Ë Thermal Insulatorsmaterials with low thermal conductivity such as pan handles and rubber Ë Electrical Conductivityhow easily electrical energy can pass through a material Ë Thermal Expansiona measure of the degree of increase in dimensions when an object is heated. Used in large engineering projects such as bridges. Ë Toughnessa materials ability to withstand impact from a dynamic force. Ë Elasticitya measurement of a material's ability to stretch under force and return to its original shape without deformation when the force is removed Ë Ductilitya material's ability to be drawn or pulled in to a long length or wire without breaking Ë PlasticityMaterials which deform permanently when small forces are applied show plasticity. Metals and thermoplastics are generally more plastic when heated. Ë StiffnessThe resistance of an elastic body to deflection by an applied force. It is important for maintaining shape for optimal performance. Examples: aircraft wing, diving boards, panels on cars. Ë Strengththe ability of a material to withstand constant force without breaking 5 forces that can act upon on a materialtension, compression, shear, torsion, bending Ë Tensile StrengthThe ability of a material to withstand pulling forces. It is important in selecting materials to resist stretching. Examples include ropes and cables. Ë Compressive StrengthThe ability of a material to withstanding squashing forces. Design examples include ceramic floor tiles, concrete and bricks such and anything to bear weight. Ï 4.2 Metals and Metallic Alloys Ë 3 Types of MetalsFerrous Metals, Non-Ferrous Metals, Alloys Ë Ferrous Metalsmetals composed of mainly iron with small additions of other substances. Ë Non-Ferrous Metalsthe group of metals that contain no iron Ë Grain sizeatoms rearrange into a regular pattern known as a metallic structure 3 types of grain sizeclose packed hexagonal, face centered cubic, body centered cubic how to determine grain sizequick cooling is small grains(stronger) and slow cooling is big grains(weaker) Properties that grain size affectdensity, tensile strength, ductility, toughness Ë Alloyinga mixture of two elements where at least one is metal. Advantages include color change, increase of strength, hardness and ductility, and changes melting point Ë Temperinga process is heat treating used to increase toughness of metals containing iron. Ë Creepthe gradual extension of a material under constant force. Ë Corrosionoccurs at high temperatures in the presence of combustion products such as cO2 and water vapor that exist in turbine engines. Ë Manufacturing Process (4.2 Metals) Shaping techniquesMelting material into liquid and pouring into molds for manufacturing, influenced by material, desired shape, surface finish, and quantity. Die CastingUtilizes reusable alloy steel dies under gravity for simple shapes with basic coring. Gravity Die CastingSimilar to die casting, uses reusable alloy steel dies under gravity, suitable for simple shapes like car wheels and engine parts. High pressure die castingMolten metal forced under pressure into locked metal die cavity for detailed components in automotive, aerospace, and appliance manufacturing. Parting LineWhere die halves meet, gates, overflows, and vents connect to casting. Flash forms here and is removed during trimming. Sand CastingMolds made with binding oils, suitable for one-off or small production runs of complex 3D shapes but with disadvantages of poor surface finish and low output rate. Investment CastingWax pattern coated in ceramic, melted to create cavity, filled with molten metal. Process of Investment castingA wax pattern is produced to a high degree of accuracy, this is then coated in high temperature ceramic material, once dry it can be fired in a kiln, the wax pattern will melt leaving the cavity to be cast into. Advantages complex shapes. excellent finish. no seam lines. Disadvantages time-consuming, non-reusable molds, expensive, and size limitations. Wasting/subtracting techniquesCutting away material to form products/components. Mild SteelGuillotine cuts sheet metal into usable sizes, then shaped/punched by manual or automatic machines. Mild steel- piercing and blankingCookie-cutter punching shapes fr
[...]
>>
Compatible OS 3.0 et ultérieurs.
<<
Ï 4.1 Materials and their Properties Ë Hardnessthe ability of a material to withstand scratching Ë Physical Propertiesrefer to the actual matter that forms the material Ë Mechanical Propertiesproperties that determine how a material reacts to external forces Ë Thermal Conductivityhow easily heat energy can pass through a material Ë Thermal Insulatorsmaterials with low thermal conductivity such as pan handles and rubber Ë Electrical Conductivityhow easily electrical energy can pass through a material Ë Thermal Expansiona measure of the degree of increase in dimensions when an object is heated. Used in large engineering projects such as bridges. Ë Toughnessa materials ability to withstand impact from a dynamic force. Ë Elasticitya measurement of a material's ability to stretch under force and return to its original shape without deformation when the force is removed Ë Ductilitya material's ability to be drawn or pulled in to a long length or wire without breaking Ë PlasticityMaterials which deform permanently when small forces are applied show plasticity. Metals and thermoplastics are generally more plastic when heated. Ë StiffnessThe resistance of an elastic body to deflection by an applied force. It is important for maintaining shape for optimal performance. Examples: aircraft wing, diving boards, panels on cars. Ë Strengththe ability of a material to withstand constant force without breaking 5 forces that can act upon on a materialtension, compression, shear, torsion, bending Ë Tensile StrengthThe ability of a material to withstand pulling forces. It is important in selecting materials to resist stretching. Examples include ropes and cables. Ë Compressive StrengthThe ability of a material to withstanding squashing forces. Design examples include ceramic floor tiles, concrete and bricks such and anything to bear weight. Ï 4.2 Metals and Metallic Alloys Ë 3 Types of MetalsFerrous Metals, Non-Ferrous Metals, Alloys Ë Ferrous Metalsmetals composed of mainly iron with small additions of other substances. Ë Non-Ferrous Metalsthe group of metals that contain no iron Ë Grain sizeatoms rearrange into a regular pattern known as a metallic structure 3 types of grain sizeclose packed hexagonal, face centered cubic, body centered cubic how to determine grain sizequick cooling is small grains(stronger) and slow cooling is big grains(weaker) Properties that grain size affectdensity, tensile strength, ductility, toughness Ë Alloyinga mixture of two elements where at least one is metal. Advantages include color change, increase of strength, hardness and ductility, and changes melting point Ë Temperinga process is heat treating used to increase toughness of metals containing iron. Ë Creepthe gradual extension of a material under constant force. Ë Corrosionoccurs at high temperatures in the presence of combustion products such as cO2 and water vapor that exist in turbine engines. Ë Manufacturing Process (4.2 Metals) Shaping techniquesMelting material into liquid and pouring into molds for manufacturing, influenced by material, desired shape, surface finish, and quantity. Die CastingUtilizes reusable alloy steel dies under gravity for simple shapes with basic coring. Gravity Die CastingSimilar to die casting, uses reusable alloy steel dies under gravity, suitable for simple shapes like car wheels and engine parts. High pressure die castingMolten metal forced under pressure into locked metal die cavity for detailed components in automotive, aerospace, and appliance manufacturing. Parting LineWhere die halves meet, gates, overflows, and vents connect to casting. Flash forms here and is removed during trimming. Sand CastingMolds made with binding oils, suitable for one-off or small production runs of complex 3D shapes but with disadvantages of poor surface finish and low output rate. Investment CastingWax pattern coated in ceramic, melted to create cavity, filled with molten metal. Process of Investment castingA wax pattern is produced to a high degree of accuracy, this is then coated in high temperature ceramic material, once dry it can be fired in a kiln, the wax pattern will melt leaving the cavity to be cast into. Advantages complex shapes. excellent finish. no seam lines. Disadvantages time-consuming, non-reusable molds, expensive, and size limitations. Wasting/subtracting techniquesCutting away material to form products/components. Mild SteelGuillotine cuts sheet metal into usable sizes, then shaped/punched by manual or automatic machines. Mild steel- piercing and blankingCookie-cutter punching shapes fr
[...]
>>
