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1. While playing hockey an individual experiences a stress of 11 MPa. A crack is known...
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...
A crack, 1 mm long on the surface, is discovered in a 6061-T651 Al alloy cylindrical...
A crack, 1 mm long on the surface, is discovered in a 6061-T651 Al alloy cylindrical support beam using the eddy current technique. The beam’s diameter is 10 cm. The beam is situated in a aircraft such that it is under a uniform normal stress that is fluctuating. The maximum stress on the beam is 300 MPa. What shape would you assume the crack has? What length would would the crack need to grow to along the surface by fatigue...
1. AA 6061, a high-strength aluminum alloy, has a 0.2% offset yield strength of 37,500-psi and...
1. AA 6061, a high-strength aluminum alloy, has a 0.2% offset yield strength of 37,500-psi and a plane strain fracture toughness (Kic) 26,400-psi (inch) At a service stress equivalent to 80% of the yield strength, will this structure fracture if it contains an edge crack of length 2.24-inches. Assume that the geometric factor, f, is 1.12. 2. A steel alloy, which has a plane strain fracture toughness (Kle) of 49-MPa(m) is exposed to a service stress of 1010-MPa. Is fracture...
H based carbon fiber containing a known amount of single walled 5. Consider a pitc Sartbon nanotu...
h based carbon fiber containing a known amount of single walled 5. Consider a pitc Sartbon nanotubes (SWNT), By adding small amounts of single walled carbon nanotubes SWNT) to the pitch prior to fiber pulling, the elastic fibers can be i the following questions a. (10 points) Estimate the elastic modulus for both the 1% and 5% SWNT loaded carbon fibers. modulus of the pitch based carbon ncreased. Use the figure below and the other information (given) to answer 700...
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...
Help 7.16 Started: Mar 13 at 11:30pm Quiz Instructions Question 1 1 pts Alarge flat plate...
Help
7.16 Started: Mar 13 at 11:30pm Quiz Instructions Question 1 1 pts Alarge flat plate is subjected to constant-amplitude uniaxial cyclic tensile stresses of a maximum stress of 102 and a minimum stress of 24 MPa. If before testing the largest surface crack is 0.61 mm and the plain-strain fracture toughness of the plate is 31.6 MPa m1/2 estimate the fatigue life of the plate in cycles to failure. For the plate, m - 4.2 and A = 5.0...
Hint: Use trial and error procedure to identify the critical crack length required for brittle fracture...
Hint: Use trial and error procedure to identify the critical crack length required for brittle fracture Integrate Paris law numerically to obtain number of cycles to failure Problem 3 (40 marks) The cross-section of a prototype gun barrel is shown in the figure below. Under repeatod firing, the barrel rapidly develops an array of 40 radial cracks, which undergo fatigue growth as a result of cyclic pressurization. It is a requirement that the fatigue life of the barrel, based on...
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...
55 min. Question 1 For some metal alloy, a true stress of 345 MPa (50040 psi)...
55 min. Question 1 For some metal alloy, a true stress of 345 MPa (50040 psi) produces a plastic true strain of 0.02. How much will a specimen of this material elangate when a true stress of 414 MPa (60050 psi) is applied if the original length is 540 mm (21.26 in.)? Assume a value of 0.22 for the strain-hardening exponent, n the tolerance is +-2% 一曲. By accessing this Question Assistance, you will learn while you earn points based...
quize 1. A nurse educator is conducting a learning needs assessment prior to teaching a group....
quize 1. A nurse educator is conducting a learning needs assessment prior to teaching a group. To collect information quickly while safeguarding individual privacy, the nurse educator should use which method? a. Structured interviews b. Questionnaires c. Focus groups d. Observations 2. A child needs to learn about self-care related to a recent diagnosis of rheumatoid arthritis. Which assessment question, based on Gardner’s eight types of intelligence, should the nurse ask the child’s parents to determine the child’s preferred learning...
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. AA 6061, a high-strength aluminum alloy, has a 0.2% offset yield strength of 37,500-psi and a plane strain fracture toughness (Kic) 26,400-psi (inch) At a service stress equivalent to 80% of the yield strength, will this structure fracture if it contains an edge crack of length 2.24-inches. Assume that the geometric factor, f, is 1.12. 2. A steel alloy, which has a plane strain fracture toughness (Kle) of 49-MPa(m) is exposed to a service stress of 1010-MPa. Is fracture...
h based carbon fiber containing a known amount of single walled 5. Consider a pitc Sartbon nanotubes (SWNT), By adding small amounts of single walled carbon nanotubes SWNT) to the pitch prior to fiber pulling, the elastic fibers can be i the following questions a. (10 points) Estimate the elastic modulus for both the 1% and 5% SWNT loaded carbon fibers. modulus of the pitch based carbon ncreased. Use the figure below and the other information (given) to answer 700...
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...
Help
7.16 Started: Mar 13 at 11:30pm Quiz Instructions Question 1 1 pts Alarge flat plate is subjected to constant-amplitude uniaxial cyclic tensile stresses of a maximum stress of 102 and a minimum stress of 24 MPa. If before testing the largest surface crack is 0.61 mm and the plain-strain fracture toughness of the plate is 31.6 MPa m1/2 estimate the fatigue life of the plate in cycles to failure. For the plate, m - 4.2 and A = 5.0...
Hint: Use trial and error procedure to identify the critical crack length required for brittle fracture Integrate Paris law numerically to obtain number of cycles to failure Problem 3 (40 marks) The cross-section of a prototype gun barrel is shown in the figure below. Under repeatod firing, the barrel rapidly develops an array of 40 radial cracks, which undergo fatigue growth as a result of cyclic pressurization. It is a requirement that the fatigue life of the barrel, based on...
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...
55 min. Question 1 For some metal alloy, a true stress of 345 MPa (50040 psi) produces a plastic true strain of 0.02. How much will a specimen of this material elangate when a true stress of 414 MPa (60050 psi) is applied if the original length is 540 mm (21.26 in.)? Assume a value of 0.22 for the strain-hardening exponent, n the tolerance is +-2% 一曲. By accessing this Question Assistance, you will learn while you earn points based...
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