39 Questions
What is the specific gravity?
Weight of a volume of material compared to water
Which property is NOT a non-mechanical property?
Abrasion Resistance
What does the Factor of Safety (FS) compare?
Actual stress to allowable stress
Which is NOT a failure mode for materials?
Buckling
What property measures the energy required for a material to reach its yield point?
Modulus of Resilience
What happens to all materials with changes in temperature?
They contract and expand
Which property is commonly associated with surface characteristics?
Surface Properties
Why is it important for structures to have a Factor of Safety greater than 1?
To ensure accurate load consideration
What is stress in engineering language?
Force normalized by geometry
What is the modulus that is tangent to the curve near the origin called?
Initial tangent modulus
Which zone exhibits instantaneous response to load and returns to its original shape upon unloading?
Elastic Zone
Which modulus is represented by a line joining two points on the curve?
Chord modulus
What does the Plastic Zone in stress-strain relations represent?
Permanent deformations
What do we call the transition between elastic and plastic behavior?
Elastic Limit
Which behavior involves stretching bonds between atoms without rearranging them?
Elastic Behavior
In stress-strain diagrams, what does the Proportional Limit represent?
Transition between linear and non-linear behavior
What is Young's modulus denoted by 'E' in mechanics of materials?
A measure of stiffness
Which material has a Poisson’s Ratio of approximately 0.33?
Aluminum
On a stress-strain diagram, what does the slope of the linear elastic region represent?
Young's Modulus
What is the modulus represented by a line joining the origin and a point on the curve called?
Secant modulus
In terms of material behavior, what is characteristic of the Elastic Zone?
Recoverable deformations
Which element of a stress-strain diagram represents the maximum stress on the curve?
Ultimate Stress
'Yielding' in stress-strain diagrams refers to what characteristic?
Strain continues with little or no increase in stress (after elastic limit)
What are some factors that contribute to the mechanical behavior of materials under external loads?
Material properties, magnitude of load, and geometry of the material element
Which type of load can cause materials to deform under load?
Both static and dynamic loads
What is specific gravity in relation to materials?
The weight of a material per unit volume compared to the weight of an equal volume of water
What is toughness in relation to materials?
The amount of energy a material can absorb before fracture
Which property measures how much a material expands when heated?
Thermal expansion
What does the factor of safety represent in engineering?
A ratio that indicates how much stronger a structure is compared to what is required for safety
Which failure mode involves the permanent deformation of materials under load?
Yielding
In materials engineering, which type of load involves constant forces over time?
'Static' loads
Which equation represents the Volumetric Coefficient of Thermal Expansion for isotropic materials?
αV = ΔV / V0 ΔT
What is the main cause of stresses developing in materials connected together due to thermal expansion?
Different rates of thermal expansion and contraction
What is one way to minimize material variability in sampling processes?
Use random sampling techniques
Which device is commonly used for direct measurement of physical and material properties in laboratories?
Ruler
What method involves measuring changes in electric voltage to determine deformation, stress, or strain in materials?
Strain gauge
In the context of sustainable development, what does LEED stand for?
Leadership in Environment and Energy Design
What role does the civil engineer play in ensuring aesthetic characteristics in a project?
Working with the architect
'Nano-materials' typically have sizes within which range?
$15-40$ nm
Test your knowledge on material behavior, including elastic, plastic, and elastoplastic behavior, as well as elements of stress-strain diagrams for brittle and ductile materials. Explore the concepts of rupture stress and different material responses under varying stress levels.
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