Elastic Behaviour of Materials

this is the mark scheme:Foundation Engineering Science
City lab Assessment M1:
Elastic Behaviour of Materials (10%)
• To find the ‘Elastic Modulus’ of two beams using a load vs deflection graph.
• To compare the experimental result and the theoretical result. M1 Marking scheme
Objective:


SECTION
Marking Criteria

marks

Abstract and Introduction
A1) Abstract: A clearly stated aim for the practical (2), how it was achieved (2) and what the final result was (2).
I1) Explanation of the elastic properties of beams and what affects how much they deflect (4), including equation (2). Definition of Elastic Modulus (3). Give examples and applications of where bending of beams may be used or found (3).
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12

Method

M1) An original (or referenced) (2) correctly labelled (2) diagram of the experimental set up (2).
M2) An original account of the procedure written as a paragraph (4) and in the 3rd person and past tense (2).

6
6

Results
R1a) Beam 1 Load vs deflection graph. Graph includes: Caption (1) and axes labels (2); units (2) error bars (1); Line of best fit (1) with R2 and equation (1). Correctly drawn minimum and maximum gradients (1)
R1b) Stated value of the calculated Elastic modulus of beam 1.
R2a) Beam 2 Load vs deflection graph. Graph includes: Caption (1) and axes labels (2); units (2) error bars (1); Line of best fit (1) with R2 and equation (1). Correctly drawn minimum and maximum gradients (1)
R2b) Stated value of the calculated Elastic modulus of beam 2.
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2
9
2
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Foundation Engineering Science
Discussion
Conclusion
D1) Description of the graphs (2), including; A description of linearity of graph (2). Any anomalous features of graphs/data noted (2).
D2) A discussion of the differences between the experimental and theoretical value of the Elastic Modulus of each beam (4). Explanation of experimental errors (4) Discussion of the origins of the error bars in the graph (2);
D3) Improvements to the method in order to gain a more accurate/precise result (4).
C1) A summary of what was found (2):
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10
4
2

EXPERIMENT 1
Worksheet Questions

E1) Labelledgraphs,includingbreakingpoint(2), yield stress point (2) and maximum stress point (2).
E2) Errors in the experiment (4)
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4


References and Appendix
Ref) Correct reference section (1). Correctly cited in text (1). App1) A results table: Labels (2) with units (2); errors (2). App2) Calculations for finding E using gradient (4) and calculations for graph gradients (2) shown.
2
12

Presentation

Pres) All word processed, graphs drawn in Excel, clearly structured (1).

2

Marks _________ out of 100
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