INDIAN INSTITUTE OF TECHNOLOGY KANPUR Department of Materials and Metallurgical Engineering Virtual Laboratories for Thermal Processing and Characterization of Materials

Tensile Sample Geometry

A typical cylindrical tensile sample is illustrated in the sketch below:

The important dimensions to measured prior to a tensile test are given below.

• Two marks are made within the uniform section (i.e., gauge section) A. The distance between these two gauge marks, denoted as G in the figure above, is called the gauge length.

• The diameter, D₁, of the gauge is measured to calculate the area of cross-section. An average several values of the diameter are taken.

• Overall, the dimensions D₁, D₂, B and R for the above tensile sample are as per some specified standard. For example, as per ASTM standard, A-370: A =  20 mm, B = 28 mm, D₁ = 4 mm, D₂ = 8 mm and R = 4 mm.

Tensile testing can also be done on plate specimen with a similar geometry as above (i.e., it will also have a reduced gauge section, etc.). In the case of the plate specimen the area of cross-section will have to be calculated by measuring the width and thickness of the gauge section.

What the world says about gauge and along with tensile
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