Lab Test: Tensile Testing 
Lab 2 Tensile Test
Abstract
The aim behind this experiment was to put Mild steel, copper and aluminium through a tensile test, with Mild steel being tabulated and graphed to show its properties and how they could be used in the real world.
Introduction/Theory
Tensile testing is one of the most simple and widely used materiel tests available. It is used to characterize the mechanical properties of the material and has direct implications on the design and construction of the end product. This test is usually done prior to any decision being made on the materials use. The theory behind tensile testing is to measure the stress-strain response of the material. By doing so you obtain the yield strength and ultimate tensile strength as some of the results and also provides information on how brittle/ductile the material is, which is vital in the future usage of the material in testing.
In this test the aim was to perform tensile tests on standard steel, Aluminium Alloy and copper test pieces using the Instron 5969 Tensile Testing machine to apply the force and an Electronic extensometer to give the readings. After obtaining the readings electronically the values were tabulated into a graph to obtain a tensile testing graph in which the values for Yield Strength
(Which is the level of stress needed to stop the material behaving elastically.), Ultimate Tensile
Strength (Highest point of stress obtained by the material) and Breaking point (Point at which the stress forces the material to rupture and break) are made clear.
The Young’s modulus (E) which is the elasticity in tension is derived from the formula:
?. ?0
?=
∆?. ?0
Equation 1
Where F is the force exerted to the metal when contracted/stretched (∆?), ?0 and ?0 are the original length and cross-sectional area respectively.
0.1% proof stress is an estimated yield point which the yield point is not easily defined from the shape of the graph.
After measuring the ∆? the percentage elongation is worked out by dividing the
Abstract
The aim behind this experiment was to put Mild steel, copper and aluminium through a tensile test, with Mild steel being tabulated and graphed to show its properties and how they could be used in the real world.
Introduction/Theory
Tensile testing is one of the most simple and widely used materiel tests available. It is used to characterize the mechanical properties of the material and has direct implications on the design and construction of the end product. This test is usually done prior to any decision being made on the materials use. The theory behind tensile testing is to measure the stress-strain response of the material. By doing so you obtain the yield strength and ultimate tensile strength as some of the results and also provides information on how brittle/ductile the material is, which is vital in the future usage of the material in testing.
In this test the aim was to perform tensile tests on standard steel, Aluminium Alloy and copper test pieces using the Instron 5969 Tensile Testing machine to apply the force and an Electronic extensometer to give the readings. After obtaining the readings electronically the values were tabulated into a graph to obtain a tensile testing graph in which the values for Yield Strength
(Which is the level of stress needed to stop the material behaving elastically.), Ultimate Tensile
Strength (Highest point of stress obtained by the material) and Breaking point (Point at which the stress forces the material to rupture and break) are made clear.
The Young’s modulus (E) which is the elasticity in tension is derived from the formula:
?. ?0
?=
∆?. ?0
Equation 1
Where F is the force exerted to the metal when contracted/stretched (∆?), ?0 and ?0 are the original length and cross-sectional area respectively.
0.1% proof stress is an estimated yield point which the yield point is not easily defined from the shape of the graph.
After measuring the ∆? the percentage elongation is worked out by dividing the