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4. Consider 4 materials A, B, C, D that all have edge cracks of width a...
step by step solution please 3. The fatigue characteristics for a brass alloy are given as...
step by step solution please
3. The fatigue characteristics for a brass alloy are given as follows: Stress Amplitude (MPa) 170 Cycles to Failure 3.7 x 104 1.0 x 105 3.0 x 105 1 x 106 1 x 107 1 x 108 1 x 109 130 114 2 0 (a) Make an S-N plot (stress amplitude vs. logarithm cycles to failure) using these data. (b) Determine the fatigue strength at 4 x 106 cycles. (c) Determine the fatigue life for...
2. A long specimen is experiencing a normal stress at the ends. a) b) c) d) Find out the safety f...
2. A long specimen is experiencing a normal stress at the ends. a) b) c) d) Find out the safety factor for fracture, if KIc-24 MPa mo5 Find out the safety factor for yielding, if 0200 MPa. Point A is 2 mm from the crack tip O. Determine σχ, Ơy,G, and τ, at point A (v:0.2). Determine whether Point A is in the plastic zone ahead of the crack tip Normal stress 40 MPa 10 mm 50 mm
2. A...
Consider 7075-T6 aluminum with fatigue crack growth in Table 16. Consider 7075-T6 aluminum with fatigue crack...
Consider 7075-T6 aluminum with fatigue crack growth in
Table
16. Consider 7075-T6 aluminum with fatigue crack growth properties as given in Table 6.3. Assuming that 1=0.5 in the Walker equation, @. estimate da/dN versus AK equations in the form of Eq. 6.22a for R=0.4 and 0.8. 6. plot the equations from (a) on a log-log scale along with the R=0 equation. Keep in mind the proper region I limits of the equation. 169x10-5 ©. For a given AK, by what...
7. The firure below shows Vickers hardness impression in garnet. The indentation Soad ws 069 N...
7. The firure below shows Vickers hardness impression in garnet. The indentation Soad ws 069 N In Lecture 11, you learn how the hardness, is related to the yield strength (a) Using the 6 um sale marker to measure dimensions, estimate the beness of net and hence its yield strength (2.4 GP, 800 MPa) b) Indentation can also be used to estimate the fracture ohness of a material the cracks stop growing when the stress t asty factor drops to...
SECTION A Q1. (a) The standards for testing the fracture toughness of materials define the shape...
SECTION A Q1. (a) The standards for testing the fracture toughness of materials define the shape and proportion of the specimens but not their size. Explain why this is and why it is necessary to use specimens of different sizes for these tests. [5 marks] (b) You are testing samples of steel with a yield stress of 1200 MPa. Initial results show that the fracture toughness is 120 MPavm. The specimens are 10 mm thick. Determine whether the specimens are...
Typical Vickers indentation on a 4 vol% carbon nanotube (CNT) reinforced ZrB2 ceramic composite s...
Typical Vickers indentation on a 4 vol% carbon nanotube (CNT) reinforced ZrB2 ceramic composite shows cracks emanating from the indentation corners (see figure). The indentation was obtained using load of 1000 g and holding time of 15 s (Vickers Hardness tester). Fracture toughness and Hardness of material are given by expressions: 1/2 0.016(5) H/2 1.854P where E is Young's Modulus of the composite (GPa); H is Vickers Hardness (GPa); P is applied load (N); c is diagonal crack length emanating...
7 a) b) c) d) Fracture toughness Kic of a material is: an indication of the...
7 a)
b)
c)
d)
Fracture toughness Kic of a material is: an indication of the materials ability to provide obstacles for dislocation motion. maximum ductility in the material an indication of the resistance a material offers to brittle fracture an indication of the materials endurance limit O maximum area under the stress-strain curve If the Kıc for Al2O3 is about 5 MPa.m 1/2, the Kıc for an Al alloy will be < 5 MPa.m 1/2 True O False The...
4 a) 4 a) continued b) c) Based on the following figures, the material that exhibits...
4 a)
4 a) continued
b)
c)
Based on the following figures, the material that exhibits an endurance limit of 10 MPa is: 700 600 Ti-5A1-2.5Sn titanium alloy 4340 steel 500 400 Maximum stress, S (MPa) 1045 steel 300 Ductile cast iron 200 70Cu-30Zn brass 2014-T6 Al alloy 100 EQ21A-T6 Mg alloy 0 104 105 108 10 106 107 Cycles to failure, N 25 PS PET 3 20 15 PMMA 2 Stress amplitude (MPa) Stress amplitude (ksi) 10 PP Nylon...
Please help with detail and good handwriting for all parts. Thank you. (Mechanical Properties of Materials)...
Please help with detail and good
handwriting for all parts. Thank you. (Mechanical
Properties of Materials)
1.2 Repeat Prob. 1.1 for the following failures: (a) A child's plastic tricycle develops cracks where the handlebars join the frame. (b) An aluminum baseball bat develops a crack. (c) A large steel artillery tube (barrel), which previously had cracks emanating from the rifling, suddenly bursts into pieces. Classify both the cracks and the final fracture. (Problem continues) (d) The fuselage (body) of a...
Answer only if you know the concept, other wise will put abuse The point loads are...
Answer
only if you know the concept, other wise will put abuse
The point loads are placed at the fixed positions shown in the figure and they are live loads. A B D E 12 2 12 k W C(centre) a Asc b f'= 32 Mpa f'es= 3 MPa fsy = 500 MPa Es = 200 GPa Ex = 28600 MPa a Cross section The following values are used for the question. • 11 = 3 m load before cracking...
step by step solution please
3. The fatigue characteristics for a brass alloy are given as follows: Stress Amplitude (MPa) 170 Cycles to Failure 3.7 x 104 1.0 x 105 3.0 x 105 1 x 106 1 x 107 1 x 108 1 x 109 130 114 2 0 (a) Make an S-N plot (stress amplitude vs. logarithm cycles to failure) using these data. (b) Determine the fatigue strength at 4 x 106 cycles. (c) Determine the fatigue life for...
2. A long specimen is experiencing a normal stress at the ends. a) b) c) d) Find out the safety factor for fracture, if KIc-24 MPa mo5 Find out the safety factor for yielding, if 0200 MPa. Point A is 2 mm from the crack tip O. Determine σχ, Ơy,G, and τ, at point A (v:0.2). Determine whether Point A is in the plastic zone ahead of the crack tip Normal stress 40 MPa 10 mm 50 mm
2. A...
Consider 7075-T6 aluminum with fatigue crack growth in
Table
16. Consider 7075-T6 aluminum with fatigue crack growth properties as given in Table 6.3. Assuming that 1=0.5 in the Walker equation, @. estimate da/dN versus AK equations in the form of Eq. 6.22a for R=0.4 and 0.8. 6. plot the equations from (a) on a log-log scale along with the R=0 equation. Keep in mind the proper region I limits of the equation. 169x10-5 ©. For a given AK, by what...
7. The firure below shows Vickers hardness impression in garnet. The indentation Soad ws 069 N In Lecture 11, you learn how the hardness, is related to the yield strength (a) Using the 6 um sale marker to measure dimensions, estimate the beness of net and hence its yield strength (2.4 GP, 800 MPa) b) Indentation can also be used to estimate the fracture ohness of a material the cracks stop growing when the stress t asty factor drops to...
SECTION A Q1. (a) The standards for testing the fracture toughness of materials define the shape and proportion of the specimens but not their size. Explain why this is and why it is necessary to use specimens of different sizes for these tests. [5 marks] (b) You are testing samples of steel with a yield stress of 1200 MPa. Initial results show that the fracture toughness is 120 MPavm. The specimens are 10 mm thick. Determine whether the specimens are...
Typical Vickers indentation on a 4 vol% carbon nanotube (CNT) reinforced ZrB2 ceramic composite shows cracks emanating from the indentation corners (see figure). The indentation was obtained using load of 1000 g and holding time of 15 s (Vickers Hardness tester). Fracture toughness and Hardness of material are given by expressions: 1/2 0.016(5) H/2 1.854P where E is Young's Modulus of the composite (GPa); H is Vickers Hardness (GPa); P is applied load (N); c is diagonal crack length emanating...
7 a)
b)
c)
d)
Fracture toughness Kic of a material is: an indication of the materials ability to provide obstacles for dislocation motion. maximum ductility in the material an indication of the resistance a material offers to brittle fracture an indication of the materials endurance limit O maximum area under the stress-strain curve If the Kıc for Al2O3 is about 5 MPa.m 1/2, the Kıc for an Al alloy will be < 5 MPa.m 1/2 True O False The...
4 a)
4 a) continued
b)
c)
Based on the following figures, the material that exhibits an endurance limit of 10 MPa is: 700 600 Ti-5A1-2.5Sn titanium alloy 4340 steel 500 400 Maximum stress, S (MPa) 1045 steel 300 Ductile cast iron 200 70Cu-30Zn brass 2014-T6 Al alloy 100 EQ21A-T6 Mg alloy 0 104 105 108 10 106 107 Cycles to failure, N 25 PS PET 3 20 15 PMMA 2 Stress amplitude (MPa) Stress amplitude (ksi) 10 PP Nylon...
Please help with detail and good
handwriting for all parts. Thank you. (Mechanical
Properties of Materials)
1.2 Repeat Prob. 1.1 for the following failures: (a) A child's plastic tricycle develops cracks where the handlebars join the frame. (b) An aluminum baseball bat develops a crack. (c) A large steel artillery tube (barrel), which previously had cracks emanating from the rifling, suddenly bursts into pieces. Classify both the cracks and the final fracture. (Problem continues) (d) The fuselage (body) of a...
Answer
only if you know the concept, other wise will put abuse
The point loads are placed at the fixed positions shown in the figure and they are live loads. A B D E 12 2 12 k W C(centre) a Asc b f'= 32 Mpa f'es= 3 MPa fsy = 500 MPa Es = 200 GPa Ex = 28600 MPa a Cross section The following values are used for the question. • 11 = 3 m load before cracking...
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