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ENG223 Materials Engineering

Question

Answered

Questions:

Aim

1.To understand the behaviour of different materials under tension.
 
2.To determine the following mechanical properties of metals:
 
0.1% Proof stress
 
Ultimate Tensile Strength
 
% elongation
 
% reduction of area
 
Young’s Modulus (Elastic Modulus)
 
Elastic limit
 
3.From data draw conclusions about the material type.
 
4.Consolidate theory on dislocation movement, and strain hardening.
 
5.Visualize a material failure under a microscope.

Things to consider:

You need to measure the load and extension of the sample undergoing tension.
 
Load is read off a load cell meter.
 
You need to measure the extension using a dial gauge.
 
The tensile test will be conducted on a bench-top tensile tester.
 
When the test piece fractures, remove the fractured pieces from the grips.  Be careful not to erase your gauge marks.
 
Place the fractured pieces together and measure the elongation between the gauge marks.
 
Note the failure surface and view under a stereo microscope.

Calculations:

From the test results determine the mechanical properties.
 
Yield stress or 0.1 % proof stress
 
Ultimate Tensile Strength
 
% elongation
 
% reduction of area
 
Young’s Modulus (Elastic Modulus)
 
On the stress strain curve indicate:
 
Yield stress or 0.1 % proof stress
 
Ultimate Tensile Strength
 
Elastic limit
 
Plastic region

Report Format:

Not more than 4 pages
 
The report should contain:
 
Date and Title
 
Results, charts, discussion including comparison to theory, predictions and error 
 
Conclusions and suggestions for improvement.

Answers to questions given below:

You must answer the following questions as well.
 
1.What determines the Young’s Modulus of materials?
 
2.If the yield strength of a material is increased three times by heat treatment, how many times will the elastic deflection increase for the same load?
 
3.If a material is loaded above yield strength but below ultimate tensile strength and unloaded, what will be its yield strength when reloaded? You could draw schematic diagram to illustrate this.
 
4.Name some typical uses for the materials tested based on your test results.

ENG223 Materials Engineering

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