STRENGTH OF MATERIALS Flashcards
What is the ratio of the transverse strain to the corresponding axial strain in a body subjected to uniaxial stress?
Poisson’s ratio
What are the four basic forms of deformation of solid bodies?
Tension, compression, bending and twisting
What is a structural member supported horizontally and carries transverse loading?
Beam
What refers to a slender member which prevents parts of a structure moving towards each other under compressive force?
Strut
What refers to the point in which the bending moment changes sign through a zero value?
Point of contraflexure
What is the unit of strain?
Unitless
Volumetric strain is the:
ratio of change in volume to original volume
What refers to the stress in the material at the elastic limit?
Yield stress
Which of the following materials has the least modulus of elasticity?
A. Steel
B. Glass
C. Copper
D. Aluminum
B. Glass
Within elastic limit, the shear stress is proportional to shear strain. What is the constant of proportionality of this statement called?
Modulus of rigidity
What is the unit of the modulus of elasticity?
A. N-m
B. Unitless
C. Pa
D. N-m/s
C. Pa
Within elastic limit, the volumetric strain is proportional to the hydrostatic stress. What is the constant that relates these two quantities called?
Bulk modulus
What is another term for modulus of rigidity?
Shear modulus
How many times greater is the plastic range of strain as compared to the elastic range of strain?
A. 100
B. 200
C. 300
D. 400
C. 300
What does it means when the material is said to be “yielding”?
A. The material has pass through plastic range and enter the elastic range
B. The material has pass through elastic range and enter the plastic range
C. The material is in the elastic range only
D. The material is in the plastic range only
The material has pass through elastic range and enter the plastic range
What refers to the parallel axis theorem for second moment of area?
Steiner’s theorem
The elastic deformation of a material is:
A. directly proportional to cross-sectional area of the material
B. inversely proportional to the modulus of elasticity of material
C. inversely proportional to the force acting on the material
D. inversely proportional to the initial length of the material
B. inversely proportional to the modulus of elasticity of material
The strain energy of a member is:
A. inversely proportional to the square of the force acting on the member
B. directly proportional to the modulus of elasticity
C. inversely proportional to the cross-sectional area of the member
D. inversely proportional to the initial length of the member
C. inversely proportional to the cross-sectional area of the member
Stiffness is:
A. ratio of force to deformation
B. ratio of force to modulus of elasticity
C. ratio of product of cross-sectional area and initial length to deformation
D. ratio of initial length to cross-sectional area
A. ratio of force to deformation
Which of the following substances has the least average coefficient of linear thermal expansion?
A. Copper
B. Concrete
C. Steel
D. Tin
C. Steel
Steel has a modulus of elasticity of _____ MPa.
A. 200
B. 2,000
C. 20,000
D. 200,000
D. 200,000
What is the maximum moment of a beam supported at both ends and carries a uniform load of w throughout its entire length?
A. wL / 2
B. wL / 8
C. wL2 / 8
D. wL2 / 4
C. wL2 / 8
____ is the stress beyond which the material will not return to its original shape when unloaded but will retain a permanent deformation.
Elastic limit
