DJJ30103
1.1 STRENGTH OF MATERIALS
APPLY THE FORCES ON
1.1.1MATERIALS
Explain the effects of following forces on materials
- Static load
- Dynamic load
- Impact load
- Fatigue and Alternating loads
Prepared By: Azuan Kamaruddin
INTRODUCTION
Force is the study of solid materials that are experiencing
hardship and seeks to explain the properties of solids during
the encumbered. Knowledge of the properties such as
strength, stiffness, deflection and so very useful in designing
components such as columns, shafts, beams, spring, bolt,
tanks and others
FORCE ON
MATERIALS
TYPES OF EFFECT OF TYPES OF
LOAD LOAD STRESS
TYPES OF LOAD
01 02 03 04
STATIC LOAD DYNAMIC LOAD IMPACT LOAD FATIGUE AND
ALTERNATING LOAD
NOT CHANGE CONSTANTLY
CHANGE IMMEDIATE LOAD VALID AT CERTAIN
TIME
EFFECTS OF LOAD
01 02 03
EXTENSION SHORTENING BENDING
EFFECTS OF LOAD
04 05
SHEAR TWIST
DJJ30103
1.1 STRENGTH OF MATERIALS
APPLY THE FORCES ON
1.1.2MATERIALS
Differentiate between tensile, compressive and shear
forces.
Prepared By: Azuan Kamaruddin
TYPES OF FORCE
01 02 03
TENSILE COMPRESSION SHEAR
DJJ30103
1.1 STRENGTH OF MATERIALS
APPLY THE FORCES ON
1.1.3MATERIALS
Define the following:
- Tensile and compressive stress.
- Tensile and compressive strain.
- Modulus of elasticity (Young’s modulus)
Prepared By: Azuan Kamaruddin
STRESS =
σ =
EXAMPLE: 30kN
Find the tensile stress for steel bar
25mm 30kN
EXAMPLE: 30kN
Find the tensile stress for steel bar
25mm 30kN
σ =
σ =
−
= 60 x
STRAIN =
ε = δ
EXAMPLE: 50mm
Find the tensile strain for steel bar if final
elongantion is 50.03mm
EXAMPLE: 50mm
Find the tensile strain for steel bar if final
elongantion is 50.03mm
ε = δ
ε = . −
= 60 x −
YOUNG MODULUS =
E = σ
ε
EXAMPLE:
Refer stress and strain had calculate in
previous, please find young modulus
E =
−
= 1 x