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Questions and Answers
What is the design process in mechanical engineering?
What is the design process in mechanical engineering?
It involves studying the structure of the machine, conducting force and thermal analysis, selecting materials based on strength, and checking for safety, stability, and deformation.
Which of the following is NOT a design consideration?
Which of the following is NOT a design consideration?
Match the following organizations with their focus area:
Match the following organizations with their focus area:
AGMA = American Gear Manufacturing Association ASME = American Society of Mechanical Engineers ISO = International Standard Organization ASTM = American Society for Testing Materials
Ceramics are only made from metallic elements.
Ceramics are only made from metallic elements.
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Materials can be classified into metals, plastics, ceramics, and __________.
Materials can be classified into metals, plastics, ceramics, and __________.
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What are the two main classifications of metals?
What are the two main classifications of metals?
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Which of the following is an example of a thermoset plastic?
Which of the following is an example of a thermoset plastic?
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Name one application of composite materials.
Name one application of composite materials.
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The materials selection process includes identifying required processing.
The materials selection process includes identifying required processing.
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Study Notes
Mechanics of Materials: Design Process
- The machine design process involves studying the structure of the machine, analyzing forces and thermal loads, determining the material's strength, selecting appropriate materials, checking for safety, stability, and deformation, as well as finding optimal dimensions and/or selecting parts from tables or catalogs.
- Design considerations include strength, reliability, cost, wear, processing, safety, weight, life, noise, thermal properties, friction, corrosion, utility, size, maintenance, flexibility, and ergonomics.
Organizations and Standards
- The following organizations are involved in developing standards and codes for mechanical engineering:
- AGMA (American Gear Manufacturing Association)
- ASME (American Society of Mechanical Engineering)
- ANSI (American National Standard Association)
- AISI (American Iron and Steel Institute)
- ASTM (American Society for Testing Materials)
- ASM (American Society for Metals)
- ISO (International Standard Institute)
- SAE (Society Automotive Engineering)
- IME (Institute of Mechanical Engineering)
- Standards cover materials, machine parts, safety, processing, and more.
- Units used are from the SI system (Système Internationale):
- M (Mass) - kg (kilogram)
- L (Length) - mm (millimeter) or m (meter)
- T (Time) - sec (second) or s (second)
- Temp (Temperature) - oC (degrees Celsius) or oK (Kelvin)
Materials Science and Engineering
- Materials science deals with the structure and properties of materials and their relationships.
- The structure of materials is determined by various features at different length scales:
- Atomic Size: 10^-11 to 10^-10 meters
- Atomic Bonding: 10^-10 meters
- Crystals (Ordered Atoms): 10^-8 to 10^-3 meters
- Crystal Texturing: Greater than 10^-6 meters
Classification of Materials
- Materials used in design and manufacturing are categorized into:
- Metals
- Plastics
- Ceramics
- Composites
- Metals:
- Ferrous: Steels, Stainless Steels, High Speed Steels, Cast Irons
- Non-Ferrous: Aluminum, Copper, Brass, Titanium
- Plastics:
- Thermoplastic: Acrylics, Nylons, PVC, Polyethylene
- Thermoset: Epoxy resins, Phenolic, Polyesters
- Elastomers: Rubbers, Silicones, Polyurethanes
- Ceramics:
- Oxides (alumina, zirconia)
- Carbides (tungsten-carbide)
- Nitrides (cubic boron nitride)
- Composites:
- Reinforced Plastics
- Ceramic-Matrix
- Metal-Matrix
- Laminates
Materials Selection Process
- This process involves choosing materials based on required properties and applications.
- Follow these steps:
- Pick Application: Determine the required properties (mechanical, electrical, thermal, magnetic, optical, deteriorative).
- Properties: Identify candidate materials based on their structure and composition.
- Material: Identify required processing methods, which affect the structure and shape through processes like casting, sintering, vapor deposition, doping, forming, joining, and annealing.
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Description
Test your knowledge of the machine design process and understand key concepts such as material strength, safety, and stability. Dive into the standards and organizations that govern mechanical engineering practices. Assess your comprehension of design considerations, optimal dimensions, and more.
