The objective of this lab is to illustrated the procedures required to perform tensile tests. Using data obtained from the test will enable the student to determine various material characteristics that affect the design process. Some findings/interpretations are the stress vs strain curve will help us show how the metal reacted to the forces applied, and the point of failure is very important as it is the ultimate strength.
To test if a metallic material is viable candidate to be used in the construction of a product the material must pass a tension test. A sample of the material is machined to standard length and dimensions. The sample is placed between an extensometer and stretched mechanically at a known rate. The results of the tensile test are used to determine various properties of a material. It can be determined from these properties if a material is appropriate for any specific application in engineering.
1- SATEC material testing system
1- PC with data capture software
1- T-1M LVDT Extensometer (50mm gauge length)
1- MTS 810 materials Testing System
1- PC with MTS control software
1- Extensometer 50 mm gauge length
The aluminum sample that my group did was tested with the MTS 810, and T-1M extensometer. The sample is placed in the MTS 810 jaws; the machine is used to apply the load to the sample an extensometer is added to measure the change in length of sample.
The procedure for the aluminum sample was as follows:
1) Power on the MTS 810
2) Start computer and run data collecting software
3) The sample is marked in the stretch zone
4) Sample was measured to determine the original cross-sectional area and the gauge length
5) Sample is placed inside the jaws using tongs
... middle of paper ...
...ial be able to withstand any load that it might encounter during its use. A tensile test is useful method of determining a materials strength and ductile properties.
Proportional limit- stress that metal can maintain a deformation directly proportional to stress
Elastic Limit- max stress before the metal goes into permanent deformation
Yield Strength- stress beyond which the increase in strains begins to take place faster than increase in stress.
Ultimate tensile strength- max stress that metal is able to take
The energy of rupture modulus of toughness- work absorber per cubic meter before break (j/m3)
Young’s modulus- measure of stiffness in material
Modulus of resilience- how elastic a material is
Percentage of elongation- measure of ductility
Reference: obtained from ENIN 241 – Mechanics of Deformable Solids Lab No. 2 – Tensile Test
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