The assignment should produce suficient evidence for partial ful?llment of the following mo dule learning outcomes:
a. Develop a program utilizing ob ject oriented programming
b. Apply computer based techniques engineering problems
e. Write e?ective formal written rep orts.
Additiona l information
It is recommended that candidates use the L
Y
X t emplate as demonstrated to you in the wor kshop sessions for the ?nal
presentation of this assignment . As p er the mo dule sp eci?cation, this s econd assessment for learning activity accounts for
30% of the mo dule.
Resources:SciLab and MAXIMA all b eing available on the university networks.
Sp ecial requirements:provided on a one-to-one basis for candidates requiring these in sp eci?cally arranged surg-eries.
Release date: 19 February 2015
Submission date: 20 April 2015
Figure T1: Typical plotted test data
1 Background
As candidates will b e aware from their classes in mechanics, comp onents are designed in order to withstand particular
design loads and/or displacements which are usually decimated by the sp eci?c design co de as well as the so called ‘failure
mo de’ of the material . In order to compare the strengths of various materials it is necessary to carry out s ome standard
form of t est to establish their relative prop erties.
One such test is the standard tensile test in which a test sp ecimen of uniform cross-section is sub jected to a gradually
increasing ten sile load until failure o ccurs. Measurements of the change in length of a selected gauge length of the bar
are recorded throughout the loading op eration by means of extensometer. One machine w hich is used to carry out such
exp eriments is the INSTRON 3367 which consists of an electromechanical load frame designed to apply a load to a test
sp ecimen via the moving cross-head. The drive system moves the cross -head up to apply a tensile load on the sp ecimen,
or down to apply a compressive load. A load transducer (load cell), mounted in series with the sp ecimen, measures the
applied load. The load cell converts the load into an electrical s ignal that the control sy stem measures and displays. Strain
transducers (extensometers) can also b e used on these systems to measure strain. It is usual to obtain vas t amount of
data from these devices which requires some degree of p ost-pro cess ing. It is this p ost-pro cessing that is sub ject of this
assignment. From the data resulting from such a test machine candidates will b e exp ected to evaluate prop erties such as
strength, elastic mo dulus and sti?ness.
The assignment ther efor e has obvious links wit h the Engineering Analysis mo dules (MS1060/3) as well as Engineering
Mechanics. Candidates will b e exp ected to research information us ing a variety of library resources within the intro ductory
mechanics of materials concepts and pr inciples. The ?rst task of the assignment has b een designed to test the candidates
computational statistical and data-analysis skills develop ed through Workshops. The ?nal task will demonstrate do cument
preparation (including referencing) and rep ort writing abilities.
Task 1:
The raw force(kN) and displacement (mm) data from ?ve test samples of extruded p olypropylene (PE) pip e using an
INSTRON 3367 will b e emailed to you separately in the form of a single text (?:txt) ?le. Note that these data are unique
to you and will b e very similar to that shown in Figure T 1 . Clearly justifying any assumptions wh en p ost-pro ces sing
2
these data and complet e the following;
a. Identify and separate the ?ve individual data ?les within your single text ?le. Pro duce smo othed plots with error
bars with 95% and 99% con?dence limits and comment on the r esu lts obtained from the smo othing pro cess {10}
b. Each of the sp ecimens are 75mm diameter with a wall thickness 3mm from the smo othed data pro duce a stress-strain
curve for the PE. Hence or otherwise evaluate at the 95% con?dence level:
i. The ultimate tensile strength {2}
ii. The material yield stress {3}
iii. The elastic mo dulus {5}
iv. Bulk mo dulus {2}
v. Rigidity mo dulus {2}
c. Describ e an exp eriment al metho d that could b e us ed to simultaneously record the transverse strain and discuss how
this could b e employed to validate the calculations you carried out in the previous question [6].
(30 marks)
3
21.94 24.27 26.51
23.02 24.31 22.23
26.84 24.74 23.88
24.79 22.14 24.17
18.12 24.22 24.26
24.66 24.07
25.55 25.55
24.65 24.08
23.30 23.91
23.46 26.41
Table 1: Failure loads of a sample of 25 pip es
Task 2:
The ultimate loads achieved from a sample of 25 pip es is shown in Table .
a. Using an op en-source equivalent to MATLAB (e.g. SciLab), add the ?ve valu es from the data sets employed in task
1 and convert all the values to stresses in MPa. {5}
b. Pro duce a frequency diagram (histogram). From your diagram state the mo dal class. Hence or otherwise make an
estimate of the mo dal yield of the pip es. {5}
c. Pro duce a cumulative frequency diagram and make an estimate of the median of the data. {5}
d. Evaluate three further measures of the central tendency of these data and comment on your results. {5}
e. Evaluate two values of the data disp ersion explaining your results clearly. {5}
f. A Russian p et roleum company requires 95 pip es made of an identical grade PE. Use a z-score [2] or otherwise to
predict the probability of a batch of pip es making the order if the minimal yield st res s should at least than 33.8MPa.
{5}
(30 marks)
Task 3:
Write a rep ort (1000-1200 wor ds) entitled.Tensile testing of the polyethylene pipes for energy producti on.
The rep ort should take the form of a lab oratory rep ort using, where appropriate, diagrams to describ e the test
p erformed and state the mechanical/material prop erties the proto col determines. Write up these ?nding together with
the results in task 1 in an accepted scienti?c manner. Ensure that at all times the rep ort is written in the third-party and
the past-tense [4]. For instance, you could consider using the L
Y
X template which we designed in class consisting of the
following sections.
AbstractThis is usually written once you have completed the rep ort.
This b eing included as part of the pre rep ort and b e no more than a paragraph detailing: what was done?
What was the key result, and.
What was the main conclusion?
4
1 Intro duction
This should say a little ab out the use of the physics of materials and the use of any mathematical formulae. This
section is usually used in order to set the scene of what the assignment is ab out. In ad dit ion, should also clearly state any
assumptions evident in the work that and validate these using appropriate cit ed references.
2 Metho d
Here you should include the rest of the relevant information p ertaining to the details of the tensile testing pro cedure as
outlined in the op ening paragraph of this task. Rationally, describ e the met ho ds you have employed (stating any formulae
used in the completion of Task 1). Ensur ing at all times that appropriate citations are used throughout via application of
a standardized referencing s ystem.
3 Results
Present all your tabulated and graphical results in order to answer Task 1: parts (a) to (c) and brie?y comment on
observat ion that can b e inferred. Ensur e that all graphs pro duced in task one are included, correctly formatted and
captioned Figures so that a List of Figures and Table of Contents are generated automatically.
4 Discussion
Include all your data comparisons for p ar ts (d) to (f ) of Task 1 and most imp ortantly comment on each results.
5 Conclusions
What did you ?nd out and what did you learn?
Do you have any recommendations?
ReferencesEnsure that all references are cited throughout the main text and the Harvard (ISO 690a) or Vancouver
system (ISO 690) is employed at all times.
(40 marks)
Submission details:
The assessment is very much an as ses sment for learning to this end similar work to that exp ected here will b e covered
extensively in workshop sessions, two of which will b e sp eci?cally arranged for you work solely on the assessment. Referring
to the appropriate mo dule descriptor the rep ort and presentation should typically describ e p rogr es s commensurate in the
aforementioned wor kshops with ab out 20-30 extra hours work con duct ed outside these sessions.
The deadline for submission of the written rep or t is 16:00 on Monday 13th April 2015. Rep orts should b e submitted to
the appropriate assignment submission tray in ro om CM007 in the C&T Building accompanied by a completed Assignment
Submission Form. As p er the university academic academic regulations [5] the usual late submission / plagiarism / p o or
presentation p enalties apply.
References
[1] Hern E. J., Str ength of materials 1, Butterworth-Heinemann, Linacre 1997.
[2] Mendenhall W. and Sincich T., Statistics for Engineering and the Sciences, 2006.
[3] Stroud K. E, and Bo oth D., Engineering Mathemati cs, Pelgrave McMillan, 2001
[4] Silyn-Rob erts H., Writing for Science and Engin eering. London : ButterHeinem ST, 2000.
[5] , Anon. Academic regulations(hollowed b e them), University of Central Lancashire, 2014.

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