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The elongation of a uniform bar of length is double the elongation when applied any external load
Elongation is the percentage of the final dimension relative to the initial dimension. For instance; A 1m length of metal is put under a load and is stretched to a final length of 1.5m The elongation of this is 150% because the final length is 150% of the initial length.
To calculate percent elongation with an equation: [(final length - initial length) / initial length] x 100 = percent elongation On a graph - To calculate percent elongation, draw a line to the x-axis from the point of fracture parallel to the straight line part of the graph. The extension at this point is then divided by the gauge length.
Strain is the measure of length change per unit length. Elongation usually refers to strain under load at failure point.
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find it out . It's measured in the lab after a pull test. Steel elongation can be measure manually or using device called extentiometer. To measure elongation of steel manually we must give 2 punch marks on the specimen with specified length (see standard/code such as ASTM, ASME etc for specimen shape and size) addressed L0. After a pull test (tension/tensile test) we measure the distance between that 2 punch marks and addressed L1. Thus, the elongation of the specimen in percentage is ((L1-L0)/L0) x 100%. Measure elongation using extentiometer is lot more easier because we can directly read the result. But this method limited for small elongation measurement only.
Strain = Extension (m) / Original length (m)
The change in length of a material under loading can be used to calculate the strain the material has undergone. When stress is plotted against strain, the gradient of the straight line portion of the stress strain curve is equal to Young's Modulus, a type of axial stiffness applicable to a material that obeys Hooke's law at stresses below the yield strength of the material.
A tensile rod in a mechanism is made from AISI 4140 OQT 1300 steel. It has a rectangular cross section , 30mm*20mm & a length of 700mm.It is to be