Basic Civil & Mechanical Engineering: UNIT I: b. Structural engineering
Stress and strain
Definition, Formula
Intensity of Stress: The internal resistance or internal force developed per unit area of the cross section of the material is known as Intensity of Stress.
STRESS AND STRAIN
1. STRESS
Intensity
of Stress: The internal resistance or internal
force developed per unit area of the cross section of the material is known as
Intensity of Stress. In practice, this intensity of stress is often called
simply as Stress.
•
Unit of stress is Newton/meter2. It is expressed in N/m2
or Pascal. Pascal is denoted as Pa in S.I. Units. [1 Pascal = 1 N/m2]
•
Stress is denoted as f. Symbol P is the external load. Symbol A is the area of
cross-section of the body.
•
f = External Force (Load) / Cross-sectional Area = P / A
2. STRAIN
Strain
is
defined as the deformation of the material per unit length. That is, strain is
the ratio of change in dimension to the original dimension. This is known as Linear
or Longitudinal Strain.
•
Strain is denoted as e. Symbol I is the initial length of the body. Symbol dl
is the change in length of the body.
•
Strain has no unit.
•
e = Change in Dimension / Original Dimension = Change in length of the body / Initial
length of the body = dl / l
Basic Civil & Mechanical Engineering: UNIT I: b. Structural engineering : Tag: : Definition, Formula - Stress and strain
Basic Civil & Mechanical Engineering: UNIT I: b. Structural engineering
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Basic Civil and Mechanical Engineering
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