Page 179 - Mechanical Behavior of Materials

180 Chapter 4 Mechanical Testing: Tension Test and Other Basic Tests

Table P4.7

σ,MPa ε, % σ,MPa ε, %
0 0 182.4 0.402
19.45 0.0199 196.9 0.503
39.2 0.0443 208 0.601
60.0 0.0717 217 0.701
88.6 0.1168 224 0.804
110.1 0.1560 230 0.903
131.0 0.203 236 1.035
149.6 0.257 240 1.173
169.1 0.333

(Final point is fracture.)

◦
4.8 Engineering stress–strain data from a tension test on AISI 4140 steel tempered at 649 C
◦
(1200 F) are listed in Table P4.8. The diameter before testing was 10 mm, and after fracture
the minimum diameter in the necked region was 6 mm. Determine the following: elastic
modulus, 0.2% offset yield strength, ultimate tensile strength, percent elongation, and percent
reduction in area.

Table P4.8

σ,MPa ε, % σ,MPa ε, %
0 0 897 4.51
202 0.099 912 5.96
403 0.195 918 8.07
587 0.283 915 9.94
785 0.382 899 12.04
822 0.405 871 13.53
836 0.423 831 15.03
832 0.451 772 16.70
829 0.887 689 18.52
828 1.988 574 20.35
864 2.94
(Final point is fracture.)

◦
4.9 Engineering stress–strain data from a tension test on AISI 4140 steel tempered at 204 C
(400 F) are listed in Table P4.9. The diameter before testing was 9.61 mm, and after fracture
◦
the minimum diameter in the necked region was 9 mm. Determine the following: elastic
modulus, 0.2% offset yield strength, ultimate tensile strength, percent elongation, and percent
reduction in area.
4.10 Engineering stress–strain data from a tension test on 7075-T651 aluminum are given in
Table P4.10. The diameter before testing was 10 mm, and after fracture the minimum diameter
in the necked region was 8 mm. Determine the following: elastic modulus, 0.2% offset yield
strength, ultimate tensile strength, percent elongation, and percent reduction in area.