What is the theoretical fracture strength of a brittle material if fracture occurs by the propagation...
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What is the theoretical fracture strength of a brittle material if
fracture occurs by the propagation...
(a) Determine the cohesive strength of alumina whisker (E = 500 GPa) (b) Assuming that fracture o...
(a) Determine the cohesive strength of alumina whisker (E = 500 GPa) (b) Assuming that fracture occurs when local stress at the crack tip reaches cohesive strength of the material, calculate nominal fracture stress of the material containing a crack with length of 2.5 μm and radius of curvature at the crack tip of 0.25 nm Estimate the percentage decrease in fracture stress if the crack length is doubled keeping the radius of curvature at the rack tip the same....
recrystallization? During grain growth? o How is the material strength affected during r o What happens...
recrystallization? During grain growth? o How is the material strength affected during r o What happens on a microstructural level during cold vw ecte amncrusuecire during recovery? During ecovery? During recrystallization? During grain growth? As you read through the sections of Ch. 8, consider the following questions: o What are the similarities & differences between ductile and brittle fracture? o What are the similarities & differences between transgranular and intergranular fracture? o How do cracks cause materials to be weaker...
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...
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...
Deformation and Fracture Mechanics 1. (Fracture toughness) (a) An AISI 4340 steel plate has a width...
Deformation and Fracture Mechanics
1. (Fracture toughness) (a) An AISI 4340 steel plate has a width W of 30 cm and has a central crack 2a of 3 mm. The plate is under a uniform stress, ?·This steel has a Kic value of 50 m2. Find the maximum stress for this crack length. (b) If the operating stress is 1500 MPa, compute the maximum crack size that the steel may have without failure. 2. (Plastic zone radius) The size of...
Chapter 9 1. What is the magnitude of the maximum stress that exists at the tip of an internal cr...
Chapter 9 1. What is the magnitude of the maximum stress that exists at the tip of an internal crack having a radius of curvature of 2.5 x 10-4 mm (10-5 in.) and a crack length of 2.5 x 10-2 mm (10-3 in.) when a tensile stress of 170 MPa (25,000 psi) is applied? 2. A large plate is fabricated from a steel alloy that has a plane strain fracture toughness of 55 MPa m (50 ksi in.). If the plate is...
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...
7. While in service, a ceramic material develops a submicron crack in the (121) directions which...
7. While in service, a ceramic material develops a submicron crack in the (121) directions which traverses 100 unit cells. Assuming the crack tip radius of curvature is 0.2 nm, what stress develops at the crack tip when a tensile stress of 20 MPa is applied? a. -0.367 nm. Om = 2007a/pc
7. While in service, a ceramic material develops a submicron crack in the (121) directions which...
7. While in service, a ceramic material develops a submicron crack in the (121) directions which traverses 100 unit cells. Assuming the crack tip radius of curvature is 0.2 nm, what stress develops at the crack tip when a tensile stress of 20 MPa is applied? 2. - 0.367 nm. Om = 2007a/Pc
7. While in service, a ceramic material develops a submicron crack in the [121] directions which...
7. While in service, a ceramic material develops a submicron crack in the [121] directions which traverses 100 unit cells. Assuming the crack tip radius of curvature is 0.2 nm, what stress develops at the crack tip when a tensile stress of 20 MPa is applied? 2. = 0.367 nm. Om = 2001 a/Pc
(a) Determine the cohesive strength of alumina whisker (E = 500 GPa) (b) Assuming that fracture occurs when local stress at the crack tip reaches cohesive strength of the material, calculate nominal fracture stress of the material containing a crack with length of 2.5 μm and radius of curvature at the crack tip of 0.25 nm Estimate the percentage decrease in fracture stress if the crack length is doubled keeping the radius of curvature at the rack tip the same....
recrystallization? During grain growth? o How is the material strength affected during r o What happens on a microstructural level during cold vw ecte amncrusuecire during recovery? During ecovery? During recrystallization? During grain growth? As you read through the sections of Ch. 8, consider the following questions: o What are the similarities & differences between ductile and brittle fracture? o What are the similarities & differences between transgranular and intergranular fracture? o How do cracks cause materials to be weaker...
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...
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...
Deformation and Fracture Mechanics
1. (Fracture toughness) (a) An AISI 4340 steel plate has a width W of 30 cm and has a central crack 2a of 3 mm. The plate is under a uniform stress, ?·This steel has a Kic value of 50 m2. Find the maximum stress for this crack length. (b) If the operating stress is 1500 MPa, compute the maximum crack size that the steel may have without failure. 2. (Plastic zone radius) The size of...
Chapter 9 1. What is the magnitude of the maximum stress that exists at the tip of an internal crack having a radius of curvature of 2.5 x 10-4 mm (10-5 in.) and a crack length of 2.5 x 10-2 mm (10-3 in.) when a tensile stress of 170 MPa (25,000 psi) is applied? 2. A large plate is fabricated from a steel alloy that has a plane strain fracture toughness of 55 MPa m (50 ksi in.). If the plate is...
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...
7. While in service, a ceramic material develops a submicron crack in the (121) directions which traverses 100 unit cells. Assuming the crack tip radius of curvature is 0.2 nm, what stress develops at the crack tip when a tensile stress of 20 MPa is applied? a. -0.367 nm. Om = 2007a/pc
7. While in service, a ceramic material develops a submicron crack in the (121) directions which traverses 100 unit cells. Assuming the crack tip radius of curvature is 0.2 nm, what stress develops at the crack tip when a tensile stress of 20 MPa is applied? 2. - 0.367 nm. Om = 2007a/Pc
7. While in service, a ceramic material develops a submicron crack in the [121] directions which traverses 100 unit cells. Assuming the crack tip radius of curvature is 0.2 nm, what stress develops at the crack tip when a tensile stress of 20 MPa is applied? 2. = 0.367 nm. Om = 2001 a/Pc
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