compression test of tubing - santa rosa junior college
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Compression Test of tubing
SRJC, ENGR 45, Fall 2013 Cameron Phillips, Andre Espinoza,
Simran Singh
Compression tests were done on three samples of 304 stainless steel tubing and three samples of copper tubing , each sample had a different diameter and wall thickness. The purpose of this experiment was to compare the stress strain curves of tubing with the tensile stress strain curves.
304 stainless steel A.K.A 18-8
• <0.08% Carbon • <2.0% Manganese • <0.75% Silicon • <0.045% Phosphorus • <0.030% Sulfur • 18.0%<Chromium<20.0% • 8.0%<Nickel<10.5% • <0.1% Nitrogen
copper
99.9% pure copper
304 stainless samples
• Each sample was cut to 6 inches in length • 1: 1.00” diameter, 0.083” wall thickness, cross
sectional area= 0.2391 square inches • 2: 0.75” diameter, 0.065” wall thickness, cross
sectional area= 0.1399 square inches • 3: 0.50” diameter, 0.049” wall thickness, cross
sectional area= 0.0694 square inches
Copper samples
• Each sample was cut to 6 inches in length • 1: 1.00” diameter, 0.050” wall thickness, cross
sectional area= 0.1492 square inches • 2: 0.625” diameter, 0.040” wall thickness,
cross sectional area= 0.0735 square inches • 3: 0.250” diameter, 0.030” wall thickness,
cross sectional area= 0.0207 square inches
304 stress strain curve
http://www.chegg.com/homework-help/questions-and-answers/using-stress-strain-data-given-figure-18-8stainless-steel-determine--yield-stressb-tensile-q694223
Copper stress strain curve
http://www.copper.org/resources/properties/144_8/
Graphs from our data
0
1000
2000
3000
4000
5000
6000
7000
0 0.05 0.1 0.15 0.2
stress
Strain
304 stainless steel
1 inchdiameter0.75 inchdiameter
0
1000
2000
3000
4000
5000
6000
7000
8000
0 0.01 0.02 0.03 0.04 0.05
stress
strain
Copper stress strain
1 Inch diameter
0.625 diameter
0.25 inch diameter
Modes of Deformation in Compression Testing
http://www.instron.us/wa/applications/test_types/compression.aspx?ref=http://www.google.com/url
The figure to the right illustrates the modes of deformation in compression testing. (a) Buckling, when L/D > 5. (b) Shearing, when L/D > 2.5. (c) Double barreling, when L/D > 2.0 and friction is present at the contact surfaces. (d) Barreling, when L/D < 2.0 and friction is present at the contact surfaces. (e) Homogenous compression, when L/D < 2.0 and no friction is present at the contact surfaces. (f) Compressive instability due to work-softening material1.
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