Essay about lab thick cylinder

962 Words Oct 22nd, 2013 4 Pages
Results

Table showing strains form grids 1 – 3 at different pressures
Pressure
Ɛ1,Grid #1(μƐ)
Ɛ2, Grid #2 (μƐ)
Ɛ3, Grid #3 (μƐ)
(Bar)
Up
Down
Avg
Up
Down
Avg
Up
Down
Avg
0
0
0
0
0
29
14.5
0
-12
-6
68.95
31.5
32.5
32
79.5
95
87.25
38.5
46
42.25
137.89
65
65.5
65.25
154
166
160
97.5
103.5
100.5
206.84
98.5
97.5
98
224
231.5
227.75
154.5
161.5
158
275.79
133.5
131.5
132.5
297.5
299.5
298.5
219.5
220
219.75
344.74
166.5
166.5
166.5
366.5
366.5
366.5
277.5
277.5
277.5

Graph showing pressure vs. strain for grids 1 - 3

Calculations

Discussion

The lab was completed as
…show more content…
Reading the indicated strain could have generated error in this lab since the values were fluctuating. Another source of error could have resulted from damage wire which could have affected the readings.. Repeated use may have contributed to permanent deformation; altering the specification of the apparatus mainly the radii and thus the soundness of values derived from equations 7 and 8. Additionally, these equations are valid for a vessel subject only to internal pressure; atmospheric pressure creates conditions which do not parallel the ideal and induces error. Work-hardening is also likely and may cause the vessel’s material to behave differently under stress; material properties such as modulus of elasticity (E) and Poisson’s ratio (v) may be altered. Finally, the strain measurement apparatus was very sensitive and provided fluctuating readings and as is the case with all electrical equipment wire resistance, power loss and an improper grounding must also be considered as possible sources of derivation. This experiment could have improve by ensuring the wiring on the test apparatus is properly intact and the apparatus is properly grounded because if the connections are disturbed, it can cause resistance between the plugs and the sockets to be alter which could cause an offset to the initial bridge balance.

Conclusion

The aim of this experiment was

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