Terms (Simple Strain) Flashcards
(22 cards)
Unit load or stress was plotted against unit elongation
Strain
Under these certain conditions, the strain may be assumed constant and its value computed
- The specimen must be of constant cross-section
- The material must be homogeneous.
- The load must be axial, that is, produce uniform stress.
Represents a change in length divided by the original length, it is a dimensionless quantity
Strain
Stress is —— to strain
Proportional
From the origin O to the point called —— limit. The stress strain curve is a straight line within this limit. The stress is directly proportional to strain.
Proportional limit
It’s called the modulus of elasticity (E) or Youngs modulus and is equal to the slope of the stress strain diagram.
Constant of proportionality (k)
The limit beyond which the material will no longer go back to its original shape when the load is removed
Elastic limit
The maximum stress that may be developed such that there is no permanent or residual deformation when the load is entirely removed
Elastic limit
Norwegian stress strain diagram from O to P it’s called
Elastic range
The region from P to R it’s called
Plastic range
Is the point at which the material will have an appreciable elongation or yielding without any increase in load
Yield point
The maximum ordinate in the stress strain diagram is
Ultimate strength or tensile strength
Is the strength of the material at rupture. This is also known as the breaking strength.
Rupture strength
Is the work done on a unit volume of material as the force is gradually increased from O to P
Modulus of resilience
Is the work done on a unit volume of material as the force is gradually increased from O to R
Modulus of toughness
Is defined as the actual stress of a material under a given loading
Working stress
The maximum safe stress that a material can carry
Allowable stress
Is the ratio of the study force acting on an elastic body to the resulting displacement it has the unit of N/MM
Stiffness. (k)
The stress of failure
Rupture strength
Is defined as the angular change between two perpendicular faces of a different element
Shearing strain
If the number of reactions exerted upon a beam exceeds the number of equations in static equilibrium, the beam is said to be
Statically indeterminate
If temperature deformation is permitted to occur freely. No load or stress will be induced in the structure in some cases for temperature deformation is not permitted an internal stress is created that is called
Thermal stress
