Homework Answers
If the temperature increases then asphalt melts. Hence the strain will be more for lesser stress. As modulus is ratio of stress and strain it decreases with increasing in temperature.
If rate of loading is increased then the fatigue of asphalt occurs which again increases the strain of the asphalt for lesser loads hence stiffness would decrease
If load level increases upto the strength of the asphalt the stiffness would increase slightly. But if loading level increases beyond its strength it would fail resulting in negligible stiffness
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(2 pts) For a viscoelastic material, such as asphalt, the modulus/stiffness of the material subjected to...
Pageく ) of Problem3 (45 pts. A cylindrical specimen of asphalt concrete with a 4-inch diameter...
Pageく ) of Problem3 (45 pts. A cylindrical specimen of asphalt concrete with a 4-inch diameter and a 6- inch height is subjected to an axial compressive static load of 150 lb for 1 hour, after which the load is removed. The test was performed at a temperature of 100°F. Plots of stress versus time and strain versus time during the loading are given below. Is this material elastic or viscous? Explain. (10 pts.) How do you describe the mechanical...
The modulus of a material is (a) proportional to the yield strength (b) the stiffness at the onset of plastic flow (c)...
The modulus of a material is (a) proportional to the yield strength (b) the stiffness at the onset of plastic flow (c) the stiffness at the onset of necking (d) none of the above Consider the following components: 1. a bicycle frame 2. a window frame a thigh bone 4. a feather 3 In which of these components is specific stiffness (E/p) important? (а) 1, 2 & 3. (b) 2, 3 & 4 (с) 1, 3 & 4. (d) 1,...
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...
Two samples made from a material with elastic modulus E 200 GPa are subjected to four...
Two samples made from a material with elastic modulus E 200 GPa are subjected to four loading conditions by applying a force F 20 kN. The first sample is a solid circular bar with a 4 cm diameter. The second sample is another circular 4 cm bar, but with a 3 cm diameter hole bored down the centerline. The undeformed (original) length of both samples is Lo 80 cm ne any stresses are below the elastic limit for the material....
A bar of unknown material is subjected to an axial tension load P. The bar, having...
A bar of unknown material is subjected to an axial tension load
P. The bar, having initial dimensions L = 500 mm and a = b = 25 mm,
is observed to elongate by 20 mm. Further, it is observed that the
volume of the bar increases by 600 mm3. The bulk modulus of the
material is measured at 20,000 MPa. Assuming that the material is
isotropic, homogeneous and linear elastic, determine the magnitude
of the load P in [kN]...
QUESTION 4 A cable is subjected to a 10.03 N tension force. The Young Modulus of...
QUESTION 4 A cable is subjected to a 10.03 N tension force. The Young Modulus of the cable is 3.17 GPa. After loading, the length of the cable Increases by 1.21 % The stress in the cable is ..... MPa (Round the final answer to TWO decimal places.)
The bulk modulus is used to measure the: Strain hardening of a material Stiffness of a...
The bulk modulus is used to measure the: Strain hardening of a material Stiffness of a volume of a material Volumetric strain of a material Resistance to lateral straining of a volume of material Question 50 Dilatation is a measure of. O Volumetric strain O Swelling O Stress concentrations Strain concentrations Question 51 When designing a beam, if several structural members with adequate section moduli are available, one can narrow the choice by considering: Weight Depth Flange depth O Web...
Young's modulus is a quantitative measure of stiffness of an elastic material. Suppose that for metal...
Young's modulus is a quantitative measure of stiffness of an elastic material. Suppose that for metal sheets of a particular type, its mean value and standard deviation are 70 GPa and 2.5 GPa, respectively. Suppose the distribution is normal. (Round your answers to four decimal places.) (a) Calculate P(69 < X < 71) when n = 9. (b) How likely is it that the sample mean diameter exceeds 71 when n = 16?
Young's modulus is a quantitative measure of stiffness of an elastic material. Suppose that for metal...
Young's modulus is a quantitative measure of stiffness of an elastic material. Suppose that for metal sheets of a particular type, its mean value and standard deviation are 80 GPa and 1.6 GPa, respectively. Suppose the distribution is normal. (Round your answers to four decimal places.) (a) Calculate P(79 s I s 81) when n = 16. (b) How likely is it that the sample mean diameter exceeds 81 when n = 25?
Young's modulus is a quantitative measure of stiffness of an elastic material. Suppose that for metal...
Young's modulus is a quantitative measure of stiffness of an elastic material. Suppose that for metal sheets of a particular type, its mean value and standard deviation are 80 GPa and 2.4 GPa, respectively. Suppose the distribution is normal. (Round your answers to four decimal places.) (a) Calculate P(79 < X < 81) when n = 9. (b) How likely is it that the sample mean diameter exceeds 81 when n = 25? You may need to use the appropriate...
Pageく ) of Problem3 (45 pts. A cylindrical specimen of asphalt concrete with a 4-inch diameter and a 6- inch height is subjected to an axial compressive static load of 150 lb for 1 hour, after which the load is removed. The test was performed at a temperature of 100°F. Plots of stress versus time and strain versus time during the loading are given below. Is this material elastic or viscous? Explain. (10 pts.) How do you describe the mechanical...
The modulus of a material is (a) proportional to the yield strength (b) the stiffness at the onset of plastic flow (c) the stiffness at the onset of necking (d) none of the above Consider the following components: 1. a bicycle frame 2. a window frame a thigh bone 4. a feather 3 In which of these components is specific stiffness (E/p) important? (а) 1, 2 & 3. (b) 2, 3 & 4 (с) 1, 3 & 4. (d) 1,...
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...
Two samples made from a material with elastic modulus E 200 GPa are subjected to four loading conditions by applying a force F 20 kN. The first sample is a solid circular bar with a 4 cm diameter. The second sample is another circular 4 cm bar, but with a 3 cm diameter hole bored down the centerline. The undeformed (original) length of both samples is Lo 80 cm ne any stresses are below the elastic limit for the material....
A bar of unknown material is subjected to an axial tension load
P. The bar, having initial dimensions L = 500 mm and a = b = 25 mm,
is observed to elongate by 20 mm. Further, it is observed that the
volume of the bar increases by 600 mm3. The bulk modulus of the
material is measured at 20,000 MPa. Assuming that the material is
isotropic, homogeneous and linear elastic, determine the magnitude
of the load P in [kN]...
QUESTION 4 A cable is subjected to a 10.03 N tension force. The Young Modulus of the cable is 3.17 GPa. After loading, the length of the cable Increases by 1.21 % The stress in the cable is ..... MPa (Round the final answer to TWO decimal places.)
The bulk modulus is used to measure the: Strain hardening of a material Stiffness of a volume of a material Volumetric strain of a material Resistance to lateral straining of a volume of material Question 50 Dilatation is a measure of. O Volumetric strain O Swelling O Stress concentrations Strain concentrations Question 51 When designing a beam, if several structural members with adequate section moduli are available, one can narrow the choice by considering: Weight Depth Flange depth O Web...
Young's modulus is a quantitative measure of stiffness of an elastic material. Suppose that for metal sheets of a particular type, its mean value and standard deviation are 70 GPa and 2.5 GPa, respectively. Suppose the distribution is normal. (Round your answers to four decimal places.) (a) Calculate P(69 < X < 71) when n = 9. (b) How likely is it that the sample mean diameter exceeds 71 when n = 16?
Young's modulus is a quantitative measure of stiffness of an elastic material. Suppose that for metal sheets of a particular type, its mean value and standard deviation are 80 GPa and 1.6 GPa, respectively. Suppose the distribution is normal. (Round your answers to four decimal places.) (a) Calculate P(79 s I s 81) when n = 16. (b) How likely is it that the sample mean diameter exceeds 81 when n = 25?
Young's modulus is a quantitative measure of stiffness of an elastic material. Suppose that for metal sheets of a particular type, its mean value and standard deviation are 80 GPa and 2.4 GPa, respectively. Suppose the distribution is normal. (Round your answers to four decimal places.) (a) Calculate P(79 < X < 81) when n = 9. (b) How likely is it that the sample mean diameter exceeds 81 when n = 25? You may need to use the appropriate...
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