Introduction to Machine Design Lecture 3 Dr./ Ahmed Mohamed Nagib Elmekawy March 3, 2016 1
Transcript
Introduction to Machine Design
Lecture 3
Dr./ Ahmed Mohamed Nagib Elmekawy
March 3, 20161
AxialStress
2
Beamundertheactionoftwotensileforces
3
Beamundertheactionoftwotensileforces
4
DeformationsofMembersUnderAxialLoading
5
DeformationsofMembersUnderAxialLoading
6
AxialStress
7
8
9
10
ShearingStress
11
ShearingStress
12
ShearingStress
13
BearingStressinconnections
14
BearingStressinconnections
15
BearingStressinconnections
16
• Calculate the average normal stress in the links connecting a) B and D b) C and E
TorsionStress
17
TorsionStress
18
TorsionStress
19
TorsionStress
20
AngleofTwist
21
ShearingStrain
22
ShearingStrain
23
ShearingStrain
24
ShearingStrain
25
Torque
26
Torque
27
Torquestresssummary
28
Shear Stress𝜏 = 𝐺𝛾= %&' =
()%*,-
𝜏 : Shear Stress 𝑐: shaft radius𝐺: Modulus of rigidity 𝑑: Shaft diameter𝛾: Shear Strain𝐽 : Polar moment of inertiaFor a hollow circular shaft of inner radius c1 and outer radius c2,the polar moment of inertia is