1 ENG1050 Answers to example questions weeks 1-6 Question Answer 60 700 - 800 MPa 1 e 61 0.60% 2 a 65 c 3 a 66 b 4 b 67 e 8 a 68 e 9 c 69 b or d (depending on the accuracy of your calculation) 11 b 71 b 13 0.89 cm 74 Copper alloy 14 0.3 76 51.32 mm 15 0.26% 77 5.75 GPa 16 244.5 MPa 78 192 MPa 17 sample 1, less work hardening 83 e 18 2.45% 84 d 19 dislocations impeded 85 b 20 high C, high elastic limit (yield stress) 86 a 25 d 90 d 26 b 91 d 27 e 92 a 28 a 93 a 30 c 94 160 GPa 32 d 98 b 34 b 99 e 35 b 100 c 36 elastic strain is recovered 101 d 37 straight line: parallel to fibres; curve: across fibres 102 d 38 31.8 MPa 108 c 39 0.17% 109 a 40 work hardening 110 a 45 c 119 c 47 b 121 a 48 c 122 a 49 a 123 e 50 b 51 d 53 e 54 c 56 b 59 Anything from 160-200 GPa
1 ENG1050 Answers to example questions weeks 1-6 Question Answer
60 700 - 800 MPa
1 e 61 0.60% 2 a 65 c 3 a 66 b 4 b 67 e 8 a 68 e
9 c 69 b or d (depending on the accuracy of your
calculation)
11 b 71 b 13 0.89 cm 74 Copper alloy 14 0.3 76 51.32 mm 15 0.26%
77 5.75 GPa 16 244.5 MPa 78 192 MPa 17 sample 1, less work
hardening 83 e 18 2.45% 84 d 19 dislocations impeded 85 b 20 high
C, high elastic limit (yield stress) 86 a 25 d 90 d 26 b 91 d 27 e
92 a 28 a 93 a 30 c 94 160 GPa 32 d 98 b 34 b 99 e 35 b 100 c 36
elastic strain is recovered 101 d 37 straight line: parallel to
fibres; curve: across fibres 102 d 38 31.8 MPa 108 c 39 0.17% 109 a
40 work hardening 110 a 45 c 119 c 47 b 121 a 48 c 122 a 49 a 123 e
50 b
