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Lecture # 5 and 6 - PowerPoint PPT Presentation


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Lecture # 5 and 6. Mechanicial Properties of Materials. Objectives:. 1): Relating Stress to Strain using experimental method. 2): Plotting Stress verses Strain (Stress – Strain diagram) 3): Extracting mechanical properties from  – diagram. The Tension and Compression Test.

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slide1

Lecture # 5 and 6

Mechanicial Properties of Materials

Objectives:

1): Relating Stress to Strain using experimental method.

2): Plotting Stress verses Strain (Stress – Strain diagram)

3): Extracting mechanical properties from – diagram.

slide2

The Tension and Compression Test

Typical steel specimen with

attached strain gauge.

Electrical-resistance

Strain gauge.

slide3

The Stress – Strain Diagram

Conventional and true stress-strain diagrams

for ductile material (steel) (not to scale).

slide4

True Stress – Strain Diagram

Stress-Strain diagram for mild steel

slide5

Percent elongation =

Percent reduction of area =

Stress – Strain Behavior of

Ductile and Brittle Materials

slide6

 (mm/mm)

Hooke’s Law

slide7

Typical Stress-Strain

curve showing

modulus of resilience, MR.

Typical Stress-Strain

diagram showing

modulus of toughness, MT.

slide8

Poission’s ratio.

  • Lateral contraction for a bar in tension with
  • Cross-sectional dimensions.
slide9

Deflection Due to Axial Loading

  • Undeformed bar and
  • Bar subject to axial force showing deformation.

(in.) or (mm.)

slide10

Deflection Due to Axial Loading

Bar with intermediate axial loads.

Bar with changes in cross section and intermediate loads.

(in.) or (mm.)

slide11

Deflection Due to Axial Loading

  • Bar with variable cross sectional area and
  • Bar subjected to loading that varies with x.

(in.) or (mm.)