ENMT600001 INTRODUCTION TO ENGINEERING MATERIALS
2013/2014
Assignment A1
Date of submission: Week 3, before the class is started
Lecturer: Prof. Dr. Ir. Bondan T. Sofyan, M.Si.
Please do the assignment IN PAIRS.
A specimen of ductile cast iron having a rectangular cross
section of dimensions 4.8 mm x 15.9 mm is deformed in tension.
Using the load-elongation data shown in the following table, do
questions A E
below.
A. Plot the data as stress versus strain in a grid paper.
B. Compute the modulus of elasticity. C. Determine the yield
strength at a strain offset of 0.002.
D. Determine the tensile strength of this alloy.
E. Compute the ductility of this alloy.
Load (N) Length (mm)
0 75.000
4,740 75.025 9,140 75.050
12,920 75.075
16,540 75.113 18,300 75.150
20,170 75.225
22,900 75.375
25,070 75.525 26,800 75.750
28,640 76.500
30,240 78.000 31,100 79.500
31,280 81.000
30,280 82.500
29,180 84.000 27,190 85.500
24,140 87.000
18,970 88.725 Fracture
