SRSD 2093: Engineering Mechanics

2SRRI SECTION 19ROOM 7, LEVEL 14, MENARA RAZAK

MECHANICAL PROPERTIES OF MATERIALSToday’s Objectives:Students will be able to:a) Understand how to measure the stress and strain through

experimentsb) Correlate the behavior of some engineering materials to the stress-

strain diagram.

PLAN OF THE LECTURE

In-Class Activities:• Stress-Strain diagram• Hooke’s Law• Axial Deformations

TENSION AND COMPRESSION TEST

APPLICATIONS

APPLICATIONS

STRESS-STRAIN DIAGRAM

STRESS-STRAIN DIAGRAM

Performing Tension or Compression Test

STRESS-STRAIN DIAGRAM

STRESS-STRAIN DIAGRAM

STRESS-STRAIN DIAGRAM

HOOKE’S LAWS

ELASTIC DEFORMATION OF AN AXIALLY LOADED MEMBER

EXAMPLE 1

EXAMPLE 1: SOLUTION

EXAMPLE 1: SOLUTION

The assembly shown in Fig. 4–7a consists of an aluminum tube AB having a cross-sectional area of 400 mm2. A steel rod having a diameter of 10 mm is attached to a rigid collar and passes through the tube. If a tensile load of 80 kN is applied to the rod, determine the displacement of the end C of the rod. Take Est = 200 GPa, Eal = 70 GPa.

EXAMPLE 2

• Find the displacement of end C with respect to end B.

• Displacement of end B with respect to the fixed end A,

• Since both displacements are to the right,

m 001143.0001143.0107010400

4.0108096

3

AE

PLB

m 003056.010200005.0

6.010809

3

/

AE

PLBC

mm 20.4m 0042.0/ BCCC

EXAMPLE 2: SOLUTION

The End