Homework Answers
For stress relaxation experiment stress should be reduced to inital stress( in our case 6.7 MPa).but in this case it is higher then initial stress (6.7 MPa<8.4MPa).if stress is not reduced to initial stress level their is no fiber relaxation. their for I take 4.8MPa In front of 8.4MPa. if you still need answers by taking value of 8.4MPa you just need to replace 4.8MPa by 8.4MPa in my calculations.
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(B)A stress of 6.7 MPa is employed to one type of a polymer under constant strain....
plastic 7. For some viscoelastic polymers that are subjected to stress relaxation tests, the stress decays...
plastic
7. For some viscoelastic polymers that are subjected to stress relaxation tests, the stress decays with time according to o(t)-σ(0) exp(-- where o(t) and o(0) represents the time-dependent and initial (i.e., time -0) stresses, respectively, and t and τ denote elapsed time and the relaxation time, τ is a time-independent constant characteristic of the material. A specimen of some viscoelastic polymer with the stress relaxation that obeys the above equation was suddenly pulled in a tension to a measured...
2 Calculate the strain response for the spring-dashpot model shown below, under a constant stress of...
2 Calculate the strain response for the spring-dashpot model shown below, under a constant stress of 10 MPa, at time. t = 0.100, 200, 300 and 400 hours. E, = 5 GP I n = 500 GPa-hours
Please give a full, detailed, worded explanation. Thank you :))) S. Draw a possible stress strain...
Please give a full, detailed, worded explanation. Thank you :)))
S. Draw a possible stress strain graph for a material with a yield stress of 300 MPa, an elastic modulus of 200 GPa, a UTS of 450 MPa and a ductility of 20%. Calculate the elastic strain at the point where the material starts to plastically deform. 6. A nylon rope with an elastic modulus of 3 GPa is placed under a force of 17.5 kN. The cross-sectional area of...
Refer to the following figure, stress-strain diagram, for samples of three different materials: A, B, and...
Refer to the following figure, stress-strain diagram,
for samples of three different materials: A, B, and C. The end of
each curve indicates the fracture point.
e) After the conclusion of the tests, if the broken halves of each
sample were fitted back together, which sample would be the
shortest? Assume that all three samples had the same initial
length. f) A circular rod is to be produced, 15 cm long with a
diameter of 5.0 mm. This rod must...
Page 5 ofs Question2 (10 pts.) The stress-strain curve for a nonlinear, perfectly elastic material is...
Page 5 ofs Question2 (10 pts.) The stress-strain curve for a nonlinear, perfectly elastic material is shown below. A sample of the material is loaded until the stress reaches the value at Point B, after which the sample is unloaded to zero stress. What is the approximate permanent deformation in material? (MPa) 125 100 75ト 50 25 A 5 10 15 20 25 30 35 40 (x 10-4) (A) 0 (B) 0.001 (C) 0.002 (D) 0.003 Support your answers with...
3080/5080 Materials Science and Engineering: Spring 2019 ead Ch. 10.1, 10.2, 10.3, 10.4, 10.5, 10...
3080/5080 Materials Science and Engineering: Spring 2019 ead Ch. 10.1, 10.2, 10.3, 10.4, 10.5, 10.9, 10.10, 10.11 CHEN Home Work 19 due Tue, Apr 16 Review olved Problems 10.1, 10.2, 10.3, 10.4, 10.6, 10.7,10.8, 10.9, 10.1o 1. Distinguish between the i) structure, ii) processing and ili) properties of a) thermoplastic b) th eric material has a relaxation time of 25 days at 27°C when a stress of 7.0 MPa is applied. days will be required to decrease the stress to...
torged to 5 mm × 1.25 mm × 25 mm under plane-strain compression. Sticking friction can...
torged to 5 mm × 1.25 mm × 25 mm under plane-strain compression. Sticking friction can be assumed at the die-workpiece contact. Also assume a constant flow stress of 50 MPa. (a) Find the force necessary to achieve this deformation. (b) Find the work required (remember that work = fFdh, and that F changes with h in this case). (c) Compute the efficiency factor η.
(b) A 2 4 CoMo alloy steel pipe with a radius of 20 mm and a wall thickness of 4 mm contains hot fluid under constant p...
(b) A 2 4 CoMo alloy steel pipe with a radius of 20 mm and a wall thickness of 4 mm contains hot fluid under constant pressure (10 MPa) and constant temperature (700°C). The stress (o) on the pipe wall is given by the equation: σ Prit, where P is pressure, r is radius and t is wall thickness. The creep constants for the alloy steel are in the following table. (i)What is the creep rate of the pipe? (ii)If...
3. A square rod of 500 mm long with a width of 10 mm is subjected...
3. A square rod of 500 mm long with a width of 10 mm is subjected to a load of 40000 N., The stress-strain behavior is shown in the Figure below. Based on the information, please answer the following questions: (Note: Pa = N/㎡, J = Nm) (a) Compute the applied stress (5 points). 70 Tensile strength 450 MPa (65.000 ps) -60 400 103 ps MPa 40厂 50 300 40 Yield strength30 250 MPa (36.000 ps) 200 100 20 10...
Solve for a), b) and c) The residual hydrodesulfurization (HDS) process is operated at the capacity...
Solve for a), b) and c)
The residual hydrodesulfurization (HDS) process is operated at the capacity of 5,000 barrels per day to produce low sulfur fuel for a power plant. The operating conditions are: Type: Fixed bed plug flow reactor Reactor temperature -400°C Reactor pressure - 2100 psi LHSV (Liquid Hourly Space Velocity) - 0.5/hr-flowrate, bbl/hr)/(reactor volume, bbl) Hydrogen gas rate - 23.7 standard liters/hr The sulfur contents of the fuel oil product must be reduced to 1.0 wt%. The...
plastic
7. For some viscoelastic polymers that are subjected to stress relaxation tests, the stress decays with time according to o(t)-σ(0) exp(-- where o(t) and o(0) represents the time-dependent and initial (i.e., time -0) stresses, respectively, and t and τ denote elapsed time and the relaxation time, τ is a time-independent constant characteristic of the material. A specimen of some viscoelastic polymer with the stress relaxation that obeys the above equation was suddenly pulled in a tension to a measured...
2 Calculate the strain response for the spring-dashpot model shown below, under a constant stress of 10 MPa, at time. t = 0.100, 200, 300 and 400 hours. E, = 5 GP I n = 500 GPa-hours
Please give a full, detailed, worded explanation. Thank you :)))
S. Draw a possible stress strain graph for a material with a yield stress of 300 MPa, an elastic modulus of 200 GPa, a UTS of 450 MPa and a ductility of 20%. Calculate the elastic strain at the point where the material starts to plastically deform. 6. A nylon rope with an elastic modulus of 3 GPa is placed under a force of 17.5 kN. The cross-sectional area of...
Refer to the following figure, stress-strain diagram,
for samples of three different materials: A, B, and C. The end of
each curve indicates the fracture point.
e) After the conclusion of the tests, if the broken halves of each
sample were fitted back together, which sample would be the
shortest? Assume that all three samples had the same initial
length. f) A circular rod is to be produced, 15 cm long with a
diameter of 5.0 mm. This rod must...
Page 5 ofs Question2 (10 pts.) The stress-strain curve for a nonlinear, perfectly elastic material is shown below. A sample of the material is loaded until the stress reaches the value at Point B, after which the sample is unloaded to zero stress. What is the approximate permanent deformation in material? (MPa) 125 100 75ト 50 25 A 5 10 15 20 25 30 35 40 (x 10-4) (A) 0 (B) 0.001 (C) 0.002 (D) 0.003 Support your answers with...
3080/5080 Materials Science and Engineering: Spring 2019 ead Ch. 10.1, 10.2, 10.3, 10.4, 10.5, 10.9, 10.10, 10.11 CHEN Home Work 19 due Tue, Apr 16 Review olved Problems 10.1, 10.2, 10.3, 10.4, 10.6, 10.7,10.8, 10.9, 10.1o 1. Distinguish between the i) structure, ii) processing and ili) properties of a) thermoplastic b) th eric material has a relaxation time of 25 days at 27°C when a stress of 7.0 MPa is applied. days will be required to decrease the stress to...
torged to 5 mm × 1.25 mm × 25 mm under plane-strain compression. Sticking friction can be assumed at the die-workpiece contact. Also assume a constant flow stress of 50 MPa. (a) Find the force necessary to achieve this deformation. (b) Find the work required (remember that work = fFdh, and that F changes with h in this case). (c) Compute the efficiency factor η.
(b) A 2 4 CoMo alloy steel pipe with a radius of 20 mm and a wall thickness of 4 mm contains hot fluid under constant pressure (10 MPa) and constant temperature (700°C). The stress (o) on the pipe wall is given by the equation: σ Prit, where P is pressure, r is radius and t is wall thickness. The creep constants for the alloy steel are in the following table. (i)What is the creep rate of the pipe? (ii)If...
3. A square rod of 500 mm long with a width of 10 mm is subjected to a load of 40000 N., The stress-strain behavior is shown in the Figure below. Based on the information, please answer the following questions: (Note: Pa = N/㎡, J = Nm) (a) Compute the applied stress (5 points). 70 Tensile strength 450 MPa (65.000 ps) -60 400 103 ps MPa 40厂 50 300 40 Yield strength30 250 MPa (36.000 ps) 200 100 20 10...
Solve for a), b) and c)
The residual hydrodesulfurization (HDS) process is operated at the capacity of 5,000 barrels per day to produce low sulfur fuel for a power plant. The operating conditions are: Type: Fixed bed plug flow reactor Reactor temperature -400°C Reactor pressure - 2100 psi LHSV (Liquid Hourly Space Velocity) - 0.5/hr-flowrate, bbl/hr)/(reactor volume, bbl) Hydrogen gas rate - 23.7 standard liters/hr The sulfur contents of the fuel oil product must be reduced to 1.0 wt%. The...
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