RIDGE OETAK 45 0.10mm lat permited R0.40 150m TYPE I 8.18mm 10.00mm 2.82mm 2.91m
ID: 776665 • Letter: R
Question
RIDGE OETAK 45 0.10mm lat permited R0.40 150m TYPE I 8.18mm 10.00mm 2.82mm 2.91mm M12 11.00mm 800mm 50.00mm 15.00mm 53.00mm R10 View larger image Figure 2 Drawing of a standard creep test specimen During the experiment a constant tensile load of 3.568 KN was applied to the sample, as described in Study session 17 1 This caused the sample to extend. You measured the change in length of the sample over time, which enabled you to calculate the strain. In Question 2a you are asked to calculate the stress acting on parts of the sample at the beginning and end of the experiment il your answers to Question 2a shouid be given in SI units (with the unit stated) to3 significant figures 1 To calculate the stress on the sample due to the applied tensile load you need to know the area over which this force is acting. Using information from Figure 2 show that the relevant cross-sectional area of the sample within the gauge length at the start of the experiment is 50 3 mm (to 3 s. i) (2 marks)Explanation / Answer
Part a:
1] From the given figure, it is clear that the diameter of the sample within the gauge length is 8 mm, d = 8*10-3 m
Hence, area, A = [pi/4]*d2 = [3.14/4]*[8*10-3 m]2
A = 50.265 mm2 = 50.3 mm2
Hence the relevant cross-sectional area of the sample within the gauge length is 50.3 mm2
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