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A mechanical test is conducted on three different materials. In this experiment, a constant tensile stress is applied instantly to a specimen. The first material, a rubber, deforms rapidly during the application of the stress, with the extent of deformation becoming progressively less until it reaches an equilibrium gage length. The second, a thermosetting material, reacts to the applied stress by deforming almost instantaneously to an equilibrium extension. The third, a thermoplastic material, initially deforms to substantial extension in response to the stress and then deforms further with the extension varying linearly with time.
(a) Describe the behavior of each material with an appropriate combination of springs and dashpots.
(b) Describe the behavior of each material following the removal of the tensile stress.
An axial force of 200 kN is applied to the assembly by means of rigid end plates. Determine the normal stress in the aluminum shell.
Two objext A and B are moving along the same line. At the time t=0, B is 75ft ahead of A. The acceleration of A is 1.8ft/s^2 and the acceleration of B is -1.3ft/s^2. The velocity of A is 32ft/s and the velocity of B is 51ft/s.
knowing that the coefficient of static friction between the collar and the rod is .35, determine the range of values of p for which equilibrium is maintained when 0=50deg and M=20Nm
Given that the minimum footing size is 2(m) x 2 (m), design the foundation so that the conveyor system experiences continued operation.
What is the equivalent amount in year 10 of an expenditure of $5,000 in year one, $8,000 in year two, and increasing by $1,000 per year through year 10 Assume the interest rate is 10% per year.
write a paragraph explaining how the relaxation modulus of a plastic material measured in engineering practice. use a sketch.
Determine the % error n in replacing the sine and the tangent of an angle by the value of the angle in radians for angle values 5,10,20 degrees. Explain the qualitative difference between the sine and tangent results.
Imagine a community for which its first roundabout is being built, something that is a relatively recent occurence even in this area. As the Director of Public Works for the community, how might you educate the members of the community? Which membe..
A soil sample is prepared in the laboratory by mixing a certain amount of dry soil with 10.5 wt% water. The relative density of the grains of the material is equal to 2.7.
Suppose that the probabilities are , respectively , 0.6, 0.2, 0.1 and 0.1 that an income tax form will be filled out correctly , that it will contain an error favoring a taxpayer , that it will contain an error favoring the government
Determine the values of S and Z and the shape factor about the horizontal x axes. Use the web and flange dimensions given in the AISC Manual for making these calculations.
7 crystal systems,....... cubic, tetragonal, orthorhombic,rhombodedral, hexagonal, monoclinic, and triclinic. withvariations there should be 7X4= 28, however due to duplicates thereare only 14. for each of the variations listed below, whichof the 14 ..
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