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Questions and Answers
What is the unit of strain?
What is the unit of strain?
What is the strain offset when a straight line is constructed parallel to the elastic portion of the stress-strain curve?
What is the strain offset when a straight line is constructed parallel to the elastic portion of the stress-strain curve?
Resultant stress is a combination of which types of stress?
Resultant stress is a combination of which types of stress?
Modulus of elasticity is defined as which of the following?
Modulus of elasticity is defined as which of the following?
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What kind of stress acts along the length of a fuselage?
What kind of stress acts along the length of a fuselage?
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A metal that experiences very little or no plastic deformation upon fracture is termed as what?
A metal that experiences very little or no plastic deformation upon fracture is termed as what?
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What is the purpose of adding a catalyst or hardener to the composite?
What is the purpose of adding a catalyst or hardener to the composite?
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For brittle materials, which stress is most effective in predicting failure?
For brittle materials, which stress is most effective in predicting failure?
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The properties of a composite are highly characterized as what?
The properties of a composite are highly characterized as what?
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In plane stress problems, how is the thickness of the material treated?
In plane stress problems, how is the thickness of the material treated?
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If the number of unknowns is less than the number of equations in a structural problem, what type of problem is it?
If the number of unknowns is less than the number of equations in a structural problem, what type of problem is it?
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Which of the following matrices has better bonding characteristics with fiber?
Which of the following matrices has better bonding characteristics with fiber?
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In a cross-ply composite laminate, the directions of the fiber are arranged in which way?
In a cross-ply composite laminate, the directions of the fiber are arranged in which way?
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In plane strain problems, how is the strain characterized?
In plane strain problems, how is the strain characterized?
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The Von Mises stress criterion is primarily applicable to which type of materials?
The Von Mises stress criterion is primarily applicable to which type of materials?
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In the context of principal stresses, how is the shear stress assumed?
In the context of principal stresses, how is the shear stress assumed?
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Which one of the following is NOT a defined material main property?
Which one of the following is NOT a defined material main property?
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What term describes the ability of a metal to be deformed significantly without breaking?
What term describes the ability of a metal to be deformed significantly without breaking?
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Which material is known to have less resistance to fracture?
Which material is known to have less resistance to fracture?
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Which of the following is not categorized under advanced materials?
Which of the following is not categorized under advanced materials?
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Which type of crystal structure has a lower packing factor?
Which type of crystal structure has a lower packing factor?
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Which material group is typically less stiff compared to others?
Which material group is typically less stiff compared to others?
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What term describes a portion of a system with uniform characteristics?
What term describes a portion of a system with uniform characteristics?
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Which type of composite material exhibits greater stiffness and strength?
Which type of composite material exhibits greater stiffness and strength?
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What is the maximum stress that can be experienced by a given structure?
What is the maximum stress that can be experienced by a given structure?
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What effect does the rate of cooling have on material strength?
What effect does the rate of cooling have on material strength?
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Which category do piezoelectric ceramics belong to?
Which category do piezoelectric ceramics belong to?
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Before reaching the yield point, how is the material deformation characterized?
Before reaching the yield point, how is the material deformation characterized?
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What happens to strain if the load is removed before the yield strength is reached?
What happens to strain if the load is removed before the yield strength is reached?
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What type of structure is directly observable under a microscope?
What type of structure is directly observable under a microscope?
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What is the state called when the approach to equilibrium is extremely slow?
What is the state called when the approach to equilibrium is extremely slow?
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Which formula correctly represents stress?
Which formula correctly represents stress?
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What is the carbon content typically found in low-carbon steel?
What is the carbon content typically found in low-carbon steel?
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What does free energy depend on?
What does free energy depend on?
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In iso-strain conditions, how do the strains of the matrix and fiber compare?
In iso-strain conditions, how do the strains of the matrix and fiber compare?
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Which type of composite is concrete classified as?
Which type of composite is concrete classified as?
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In composite materials, what term is used to describe fibers and particles?
In composite materials, what term is used to describe fibers and particles?
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Which type of composite exhibits the best impact resistance characteristics?
Which type of composite exhibits the best impact resistance characteristics?
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What is the typical diameter range for particles in dispersion-strengthened composites?
What is the typical diameter range for particles in dispersion-strengthened composites?
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The critical length of the fiber in a composite is primarily dependent on which factor?
The critical length of the fiber in a composite is primarily dependent on which factor?
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In a uni-directional laminate, how are the fibers arranged?
In a uni-directional laminate, how are the fibers arranged?
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What is the internal shear force's orientation relative to the plane in composite materials?
What is the internal shear force's orientation relative to the plane in composite materials?
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Edge dislocation falls under which category of defects?
Edge dislocation falls under which category of defects?
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What term describes the relationship between deformation and applied force?
What term describes the relationship between deformation and applied force?
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Which type of properties relates to temperature changes in materials?
Which type of properties relates to temperature changes in materials?
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Which element is predominant in the composition of stainless steel?
Which element is predominant in the composition of stainless steel?
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What term is used when a solution cannot dissolve more solute?
What term is used when a solution cannot dissolve more solute?
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Which material typically shows less resistance to fracture?
Which material typically shows less resistance to fracture?
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In thermodynamics, a system is at equilibrium when its free energy is at which level?
In thermodynamics, a system is at equilibrium when its free energy is at which level?
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What property describes materials that have the same physical properties in all directions?
What property describes materials that have the same physical properties in all directions?
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Study Notes
Material Properties and Definitions
- Material main property that is not defined: Conductive
- Ability of metal to extend without breaking: Ductility
- Material with low fracture resistance: Concrete
- Material not part of advanced materials: Micromaterials
- Material group with less stiffness: Polymers
- Best material conductor group: Metals
Composite Materials
- Stiffer and stronger composite material: Carbon fiber reinforced
- Method to prevent crack propagation: Heat treatment, stress relieving, material substitution (rounding hatch corners is not a solution)
- Cause of brittle metal alloys: Cooled to very low temperatures
- Design factor calculation: Yield strength (200 MPa) / Applied strength (100 MPa) = 2
- Material with better bonding with fiber: Epoxy
Material Properties (Cont.)
- Measure of plastic deformation at fracture: Ductility
- Average tensile strength (200, 210, 220 MPa): 210 MPa
- Deformation before yield point: Elastic
- Effect of removing load before yield strength on strain: Strain becomes zero
- Maximum stress a structure/material can experience: Tensile strength
- Hooke's law implementation: Before the yield point
- Stress formula: Stress = Force / Area
- Unit of stress: Megapascal (MPa)
- Units of yield strength: MPa or psi
- Material energy absorption capacity: Resilience
- Strains unit: No units
- Strain offset for stress-strain curve: 0.002
- Modulus of elasticity formula: E = stress / strain
- Material with little plastic deformation: Brittle
- Purpose of adding catalyst/hardener to composite: Strengthens the composite
Composite Properties and Classification
- Composite material property: Anisotropic
- Matrix bonding characteristic: Epoxy
- Carbon fiber identification: Black color
- Composite continuous phase: Matrix
- Fiber directions in cross-ply laminate: 0 degrees and 90 degrees
- Strain condition: Matrix and fiber strain are the same
Stress and Deformation
- Concrete composite type: Particle-reinforced composite
- Fibers and particles in composites: Dispersed phase
- Best impact resistance composite: Aramid fiber reinforced composites
- Particle size in dispersion-strengthened composites: 0.01 µm – 0.1 µm
- Fiber arrangement in uni-directional laminate: Either 0 degrees or 90 degrees
- Load causing iso-strain: Longitudinal (axial) stress
- Fuselage structure assumption: Thin-walled structure
- Internal shear forces direction: Parallel to the plane
- Resultant stress combination: Shear stress and normal stress
- Stress acting along fuselage length: Longitudinal (axial) stress
- Stress used to predict brittle material failure: Ultimate stress
- Thickness assumption in plane stress problems: Negligible
- System type when unknowns < equations: Statically determinate
- Strain in plane strain problems: In one plane
- Stress criteria for ductile materials: Von Mises
Additional Material Properties and Definitions
- Solubility limit definition: When a solution cannot dissolve any more solute
- Material resistance to localized plastic deformation: Hardness
- Effect of rolling on material: Reduces ductility
- Relation between grain size and material strength: Smaller grain size, stronger material
- Solidus line separation: Liquid region from the liquid-solid region
- Strain after yield strength removal: Stops with some recovery
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Description
Test your knowledge on the fundamental concepts of composite materials and stress analysis. This quiz covers subjects such as strain, modulus of elasticity, and composite laminate properties. Ideal for students studying materials science and engineering principles.
