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Published by azuan.pmu, 2021-09-26 10:02:32

SOM Topic 1.1

SOM Topic 1.1

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


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