What is the permissible stress in a fillet-welded lap joint if the weld size is 8 mm?

120 MPa

Riddle: I can stretch and compress, but I am not a rubber band. My strength is measured in MPa, and I am mainly used in construction. What am I?

Steel

Fill in the blank: The coefficient of thermal expansion for steel is ______.

12 × 10⁻⁶/°C

True or False: Ductility is the property of a material that allows it to be deformed significantly before failure.

True

For a linear elastic material, the relationship among Young's modulus (E), Poisson's ratio (μ), and shear modulus (G) is given by ______.

E = 2G(1 + μ)

What is the strain energy density of a prismatic bar under uniaxial tension with axial stress σ and modulus of elasticity E?

U = σ² / (2E)

Which of the following materials is considered brittle? (a) Aluminum (b) Glass (c) Copper (d) Mild Steel

(b) Glass

Fill in the blank: The maximum thermal stress in a concrete pavement slab resting on a frictionless base is ______.

Zero

True or False: Strain hardening refers to a material's ability to undergo plastic deformation without an increase in stress.

False. Strain hardening refers to experiencing higher stress than yield stress with increased deformation.

Riddle: I am the area under the stress-strain curve, measured in N-m. What am I?

Modulus of toughness

What is the axial rigidity of a rod if its modulus of elasticity is E, cross-sectional area A, and length L?

EA / L

Fill in the blank: The phenomenon where a material progressively deforms under constant loading over time is called ______.

Creep