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Course image Strength of materials
Highway Technology
Strength of materials


UNIT 3:  MECANICAL PROPERTIES OF MATERIALS. 16

2.1.  Introduction. 16

2.2.  Response of materials to stress. 17

2.3.  Test Specimens. 18

2.4.  Normal Stresses. 19

2.4.1. Stress-strain Diagram.. 21

2.4.2. Proportional Limit (Hooke's Law). 22

2.4.3. Elastic Limit. 22

2.4.4. Elastic and Plastic Ranges. 22

2.4.5. Yield Point. 22

2.4.6. Ultimate Tensile Strength. 23

2.4.7. Rupture Strength. 23

2.4.8. Modulus of Resilience. 23

2.4.9. Modulus of Toughness. 24

2.4.10. Necking in Tension. 24

2.4.11. Strain Hardening. 25

2.4.12. Ductility. 25

2.4.13. Working Stress, Allowable Stress, and Factor of Safety. 26

2.4.14. Stiffness, k. 26

2.5.  Axial Deformation. 26

2.6.  Flexural stresses. 27

2.7.  Shearing Deformation. 30

2.8.  Torsion. 31

2.8.1. Torsional shearing stress, τ. 32

2.8.2. Angle of twist. 32

2.9.  Thermal Stress. 33

2.10.  Normal and shear stresses on inclined sections. 34

2.10.1.  Calculation of the associated stresses. 34

2.10.2.  Sign convention. 36

2.10.3.  Calculation example  37

alexis niyoyigenera

alexis niyoyigenera

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