Based on Beer, Johnston, DeWolf & Mazurek (8th
Edition)
MECHANICS OF MATERIALS –
PRACTICE QUESTIONS (BEER
8TH EDITION STYLE)
PETERSON NJIRAINI
OMNIVERSEHUB
0
, SECTION A: STRESS & STRAIN
Problem 1
Define normal stress and shear stress.
Solution:
Normal stress is force per unit area acting
perpendicular to the surface: σ = P/A. Shear stress is
force per unit area acting parallel to the surface: τ =
V/A.
Problem 2
A steel rod of diameter 20 mm carries a load of 50 kN.
Find the normal stress.
Solution:
A = πd²/4 = π(0.02)²/4
= 3.14×10⁻⁴ m² σ =
50,.14×10⁻⁴ =
159 MPa
Problem 3
A bar 1.5 m long elongates by 0.75 mm. Find the strain.
1
Edition)
MECHANICS OF MATERIALS –
PRACTICE QUESTIONS (BEER
8TH EDITION STYLE)
PETERSON NJIRAINI
OMNIVERSEHUB
0
, SECTION A: STRESS & STRAIN
Problem 1
Define normal stress and shear stress.
Solution:
Normal stress is force per unit area acting
perpendicular to the surface: σ = P/A. Shear stress is
force per unit area acting parallel to the surface: τ =
V/A.
Problem 2
A steel rod of diameter 20 mm carries a load of 50 kN.
Find the normal stress.
Solution:
A = πd²/4 = π(0.02)²/4
= 3.14×10⁻⁴ m² σ =
50,.14×10⁻⁴ =
159 MPa
Problem 3
A bar 1.5 m long elongates by 0.75 mm. Find the strain.
1
