“? Plot the engineering stress versus engineering strain graphs in the low strain”

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Plot the engineering stress versus engineering strain graphs in the low strain (<1%) region to determine Youngs Modulus (E) 0.1% proof stress and strain at yield. Note that a linear regression line can be created easily in Excel for the elastic region by creating an additional column of strain values and adding the offset (0.001). By c licking on the new line and selecting the linear fit option thi s will produce a regression line . The option to display the regression equation will provide you with the slope (E). ? Plot the engineering stress versus engineering strain and true stress versus engineering strain graphs from zero strain up to failure. ? De termine the ultimate tensile strength fracture stress ductility and work to fracture . ? Determine the relationship between Vickers hardness and Yield Strength ? = x (VHN) g. ? Examine the fracture surfaces and describe the fracture process. ? Use CES Edupack ( available in the Mechanical Engineering 5 th floor cluster under Programs/Mechanical/ CES Edupack ) to determine which material you have tested for A B C and discuss your results vs what was expected from the database . Deliverables: Each student should p roduce a brief but concise laboratory report containing an abstract introduction materials and methods results discussion and conclusion. Your report should include results of using the Materials Selector Database (CES Edupack) a s a means to determine which materials were used in the study (A B C) based on their appearance fracture behaviour and mechanical properties of your experimental laboratory . Introduce all background material initially in the Introduction of your report . The mater ials and methods should be as brief as possible . Y o u can include this laboratory procedure in an appendix and refer to it in your materials and met hods to keep this section brief. Also include a brief description of the on line Materials Selector Database (CES E dupack) . The two required graphs for each material in the Results section are: (a) Engineering stress versus engineering strain up to yield. (b) Engineering stress versus engineering strain and true stress versus engineering strain from the start up to fra cture. These may be presented together in a single figure. The laboratory report accounts for 1 0 % of the overall module mark. EXPERIMENTAL METHOD Follow instructions carefully ask for assistance when you do not understand! Important Safety Notice: ? Forc es may reach in excess of 50kN 5Tonnes. Keep your hands clear of the machine when the load is being applied. ? Keep clear of the machine. The door is not a safety guard; it is only to stop d ebris. ? Ensure you wear safety glasses at all times. ? Keep the d oor closed when the test is running. ? Following every measurement interval ensure the door is closed before you continue the test. ? If you need to stop the machine in an emergency press the red stop switch. Tensile test protocol : 1) Familiarise yourself w ith the software and the logos below: Console settings Here you can reduce the jog speed of the cross head or return it to normal Strain 1 settings the settings for strain gauge where you can calibrate or balance the strain gauge. Load cell

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Plot the engineering stress versus engineering strain graphs in the low strain” appeared first on AquaWriter.

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