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Discuss the cyclic deformation of a material in terms of the two-element Masing model, assuming elastic-perfectly plastic response.
(a) Construct the hysteresis loops for a small amplitude at which only the softer elements yield plastically and for a larger amplitude at which both elements yield plastically.
(b) Show that the so-called 'permanent softening' is expected only in one of the two cases and that the amount of permanent softening is equal to twice the internal back stress in the soft elements.
(c) Considering both cases, can permanent softening be considered an unambiguous measure of the back stress?
(d) Describe the occurrence of the Bauschinger effect in terms of deformation-induced internal
two wooden members of uniform rectangular cross section of sides a = 100 mm and b = 60 mm are joined by a simple glued joint as shown. knowing that the ultimate stress of the joint are 1.26 MPa in tension and 1.50 MPA in shear and that P= 6kN
determine the range of the distance d for which the beam is safe.
If direct runoff hydrgraph derived from a unit hydrograph of a catchment (drainage area = 50 acre) is 120 acre-ft, back calculate the rainfall amount. Assume total abstraction in the area is 50%.
A couple M of magnitude 18 Nm is applied to the handle of a screwdriver to tighten a screw into a block of wood. Determine the magnitudes of the two smallest horizontal forces that are equivalent to M
Is it desirable to use concrete of very high strength i.e. exceeding 60MPa? What are the potential problems associated with such high strength concrete?
An 1100 ft. straight line route survey, which had PI’s at3+81.27 (I = 12o30’) and 5+42.30 (I = 10o56’), laterhad 600 ft radius simple curves inserted at each PI. Computethe following:
Determine the time required for a car to travel 1 km along a road if the car starts from rest, reaches a max speed at some intermediate point, and then stops at the end of the road. the car can accelerate at 1.5 m/s^2 and decelerates at 2 m/s^2
1. an analysis of dredged sediments from a stormwater retention basin revealed a high concentration in mgkg of the
Plateau Creek carries 5.0 m^3/s of water with a selenium (SE) concentration of 0.0015 mg/L. a farmer starts withdrawing 1.0 m^3/ of the creek water to irrigate the land.
When a 60 kg boy floats in the pool 93% of his body is submerged. How much force must he exert to stay submerged on the bottom of the pool to remain fully submerged
An intersection approach volume is 1,500 veh/h and includes 12% left turns with a through-vehicle equivalent of 2.3 tvu's/left turn. What is the total equivalent through volume on the approach
Write a brief paragraph summarizing the following Habitat Simulation Method used to analyze environmental flow requirements.
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