Homework Answers
Solution
Part a
Option e is correct
Fracture toughness Kic of a material is maximum area under stres strain curve
Part b
False
Alloy have higher Kic value than its metal form.
Part c
True
Ceramics have compressive strengths about ten times higher than their tensile strength. The tensile strength of ceramics and glasses is low because the existing flaws (internal or surface cracks) act as stress concentrators.
Part d
Elastic + plastic
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7 a)
b)
c)
d)
Fracture toughness Kic of a material is: an indication of the...
6 a) b) c) The most important parameter that is an indication of a material's resistance...
6 a)
b)
c)
The most important parameter that is an indication of a material's resistance to deflection (eg. in beams) arising from mechanical loads is O Tensile strength O %elongation O impact toughness O ductility Yield strength o Kic Endurance limit OE The yield strength of a steel used in construction is ~ 800 MPa. The endurance limit of this steel is ~ 0.2 800 MPa 40% O 400 MPa O 1600 MPa O 200 MPa 0.4 MPa 4...
A certain ceramic has a fracture toughness, Kic, of 5 MN/m32. A batch of samples of...
A certain ceramic has a fracture toughness, Kic, of 5 MN/m32. A batch of samples of this material contains surface flaws, existing along the circumference and of depth 10 μm. Estimate (a) the tensile strength and (b) the compressive strength of the samples.
1. A large plate is fabricated from a steel alloy that has a plane strain fracture toughness of 8...
1. A large plate is fabricated from a steel alloy that has a plane strain fracture toughness of 82.4 MPavm. If the plate is exposed to a tensile stress of 345 MPa during service use, determine the minimum length of a surface crack that will lead to fracture. Assume a value of 1.0 for Y. Maximum stress at tip of elliptically shaped crack Pt 2Ery, 1/2 critical stress required for crack propagation in a brittle material πα KIe YoeVra Fracture...
Q21. Which one of the following statements about the ductility of metals is TRUE? A High ductility occurs in brittle materials B Ductility is the amount of deformation at the 0.2% proof stress C Duct...
Q21. Which one of the following statements about the ductility of metals is TRUE? A High ductility occurs in brittle materials B Ductility is the amount of deformation at the 0.2% proof stress C Ductility can be measured as % reduction in area from broken tensile samples D Ductility is deformation in the elastic region E Ductility is the change between upper and lower yield point in steels Q22. Which one of the following statements is TRUE about Charpy impact...
5. Circle true of false for the following statements: T The resistance ofa material to indentation...
5. Circle true of false for the following statements: T The resistance ofa material to indentation is a qualitative indication of its strength. Ultimate tensile strength is the maximum stress on the engineering stress strain T F curve Young's modulus is closely related to the bonding energies of the atoms. T A bend test is used for brittle materials to describe the material's strength. T F Ductility is frequently quantified as the percent elongation at failure T F tr.
5....
11 Flaws are detrimental to fracture strength because an applied stress may be amplified or concentrated...
11 Flaws are detrimental to fracture strength because an applied stress may be amplified or concentrated at the tip of a flaw. (5 (5 Points) True False 12 Fracture toughness, in the presence of a crack, is related to the critical stress for crack propagation. (5 Points) True False 13 Plane strain fracture toughness, KIC, gives us an estimate of the magnitude of local stresses near a crack tip that govern fast fracture. (5 Points) True False 14 Elastic strain...
1.Below are stress-strain curves for 5 steels. (a) annealed low carbon steel, (b) a steel alloy...
1.Below are stress-strain curves for 5 steels. (a) annealed low carbon steel, (b) a steel alloy which has a DBTT of +50°C (c) 304 stainless steel (d) nearly pure coarse grained Fe Identify the modulus, yield stress, tensile strength, ductility, and toughness. Identify the amount of elastic strain at yield stress, tensile strength, point right before fracture, point right after fracture. 2000 -Low C steel, 1800 steel alloy, DBTT +50C 304 stainless pure Fe 1600 1400 1200 t 1000 800...
3 a) b) c) d) As the grain size in a metallic decreases, electrical conductivity is...
3 a)
b)
c)
d)
As the grain size in a metallic decreases, electrical conductivity is likely to increase significantly. O True False A computer part was made with a plastic with a Tg --60C. When used under normal conditions, its toughness > ductility O True O False Which of the following is correct for concrete? G>YS CS-T50.5 G>E TS <YS TS-CS CS > Kic TS <CS Endurance limit > TS As the average molecular weight in a plastic increases,...
1-Determine the % elongation, yield stress and ultimate tensile strength of the material tested above 2-Calculate...
1-Determine the % elongation, yield stress and ultimate tensile
strength of the material tested above
2-Calculate the elastic modulus of the material tested above
3-If a 200mm cylindrical rod of the material tested above, with
radius 20mm, was subjected to a tensile load of 200kN, what would
the length be?
4-An underground wastewater steel pipe with 2mm walls carries an
ammonia solution of 40 g/m3. The pipe is in contact with
groundwater (assume 0 g/m3 ammonia). Determine the
diffusion rate...
Question 6 1 pts When a material doesn't change its strain perpendicular to the loading condition,...
Question 6 1 pts When a material doesn't change its strain perpendicular to the loading condition, the material is said to exhibit: Fracture Toughness Plane Strain Plane Stress Crack Propagation Question 7 1 pts The sharper the fillet radius is on the geometry of the part, the the stress concentration factor will be and the the material will catastrophically fajl. lower, more likely higher, less likely higher, more likely lower, less likely Question 8 1 pts FCC metals experience a...
6 a)
b)
c)
The most important parameter that is an indication of a material's resistance to deflection (eg. in beams) arising from mechanical loads is O Tensile strength O %elongation O impact toughness O ductility Yield strength o Kic Endurance limit OE The yield strength of a steel used in construction is ~ 800 MPa. The endurance limit of this steel is ~ 0.2 800 MPa 40% O 400 MPa O 1600 MPa O 200 MPa 0.4 MPa 4...
A certain ceramic has a fracture toughness, Kic, of 5 MN/m32. A batch of samples of this material contains surface flaws, existing along the circumference and of depth 10 μm. Estimate (a) the tensile strength and (b) the compressive strength of the samples.
1. A large plate is fabricated from a steel alloy that has a plane strain fracture toughness of 82.4 MPavm. If the plate is exposed to a tensile stress of 345 MPa during service use, determine the minimum length of a surface crack that will lead to fracture. Assume a value of 1.0 for Y. Maximum stress at tip of elliptically shaped crack Pt 2Ery, 1/2 critical stress required for crack propagation in a brittle material πα KIe YoeVra Fracture...
Q21. Which one of the following statements about the ductility of metals is TRUE? A High ductility occurs in brittle materials B Ductility is the amount of deformation at the 0.2% proof stress C Ductility can be measured as % reduction in area from broken tensile samples D Ductility is deformation in the elastic region E Ductility is the change between upper and lower yield point in steels Q22. Which one of the following statements is TRUE about Charpy impact...
5. Circle true of false for the following statements: T The resistance ofa material to indentation is a qualitative indication of its strength. Ultimate tensile strength is the maximum stress on the engineering stress strain T F curve Young's modulus is closely related to the bonding energies of the atoms. T A bend test is used for brittle materials to describe the material's strength. T F Ductility is frequently quantified as the percent elongation at failure T F tr.
5....
11 Flaws are detrimental to fracture strength because an applied stress may be amplified or concentrated at the tip of a flaw. (5 (5 Points) True False 12 Fracture toughness, in the presence of a crack, is related to the critical stress for crack propagation. (5 Points) True False 13 Plane strain fracture toughness, KIC, gives us an estimate of the magnitude of local stresses near a crack tip that govern fast fracture. (5 Points) True False 14 Elastic strain...
1.Below are stress-strain curves for 5 steels. (a) annealed low carbon steel, (b) a steel alloy which has a DBTT of +50°C (c) 304 stainless steel (d) nearly pure coarse grained Fe Identify the modulus, yield stress, tensile strength, ductility, and toughness. Identify the amount of elastic strain at yield stress, tensile strength, point right before fracture, point right after fracture. 2000 -Low C steel, 1800 steel alloy, DBTT +50C 304 stainless pure Fe 1600 1400 1200 t 1000 800...
3 a)
b)
c)
d)
As the grain size in a metallic decreases, electrical conductivity is likely to increase significantly. O True False A computer part was made with a plastic with a Tg --60C. When used under normal conditions, its toughness > ductility O True O False Which of the following is correct for concrete? G>YS CS-T50.5 G>E TS <YS TS-CS CS > Kic TS <CS Endurance limit > TS As the average molecular weight in a plastic increases,...
1-Determine the % elongation, yield stress and ultimate tensile
strength of the material tested above
2-Calculate the elastic modulus of the material tested above
3-If a 200mm cylindrical rod of the material tested above, with
radius 20mm, was subjected to a tensile load of 200kN, what would
the length be?
4-An underground wastewater steel pipe with 2mm walls carries an
ammonia solution of 40 g/m3. The pipe is in contact with
groundwater (assume 0 g/m3 ammonia). Determine the
diffusion rate...
Question 6 1 pts When a material doesn't change its strain perpendicular to the loading condition, the material is said to exhibit: Fracture Toughness Plane Strain Plane Stress Crack Propagation Question 7 1 pts The sharper the fillet radius is on the geometry of the part, the the stress concentration factor will be and the the material will catastrophically fajl. lower, more likely higher, less likely higher, more likely lower, less likely Question 8 1 pts FCC metals experience a...
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