16 Questions
Which type of loading involves a force applied slowly to an assembly or object?
Static Loading
What is the definition of stress in terms of mechanical properties of materials?
Force/Area
What is the unit of stress when expressed in N/mm2?
kg/cm2
In terms of mechanical properties of materials, what does strain refer to?
Deformation due to stress
What are the mechanical properties that describe the behavior of materials subjected to different types of loads?
Mechanical Properties
Which type of loading involves a force applied repeatedly, causing variation in the magnitude and sometimes in the sense, of the internal forces?
Repeated Loading
What is the normal stress?
The stress normal to the section, and could be tension or compression stress
What is the shear stress?
The stress parallel to the section
What is the definition of strength in engineering materials?
The ability of material to resist static loads
What is the definition of yield or proof stress?
The point in the stress-strain curve at which the curve levels off and plastic deformation begins
What is the definition of elasticity in engineering materials?
The ability of a material to return back to its original shape and dimensions after removing the applied load
What is stiffness in engineering materials?
Resistance to deformations (measured by the Young’s Modulus “E”)
What is Poisson's ratio in engineering materials?
- The ratio between lateral strain to the axial strain
What is ductility in engineering materials?
The maximum percentage of deformation
What is brittleness in engineering materials?
Failure of materials almost without deformations
What is hardness in engineering materials?
Material surface resistance to any indentation or scratch caused by any type of load
Study Notes
Types of Loading
- Static loading involves a force applied slowly to an assembly or object.
- Dynamic loading involves a force applied repeatedly, causing variation in the magnitude and sometimes in the sense, of the internal forces.
Mechanical Properties of Materials
- Stress is defined as the internal force per unit area of a material, resisting an external force.
- The unit of stress is MPa (Megapascal) or N/mm².
- Strain refers to the ratio of change in dimension to the original dimension of a material, resulting from an external force.
Types of Stresses
- Normal stress is a stress that occurs when the force is perpendicular to the surface of the material.
- Shear stress is a stress that occurs when the force is parallel to the surface of the material.
Material Properties
- Strength is the ability of a material to resist external forces without breaking or deforming.
- Yield or proof stress is the stress at which a material begins to deform plastically.
- Elasticity is the ability of a material to return to its original shape after removal of an external force.
- Stiffness is the ability of a material to resist deformation under an external force.
- Poisson's ratio is the ratio of lateral contraction to longitudinal extension of a material under tension.
- Ductility is the ability of a material to be drawn into thin wires or sheets without breaking.
- Brittleness is the tendency of a material to break or shatter under an external force.
- Hardness is the ability of a material to resist scratching or abrasion.
Test your knowledge on the basic properties of engineering materials, specifically focusing on mechanical properties subjected to different types of loads such as static, dynamic, or repeated loads. The quiz is based on the course taught by Dr. Engy Hany, Assistant Professor at the Faculty of Engineering, Ain Shams University, for the Fall 2023 semester.
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