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It was shown in Section 6.3 that mode I fatigue crack growth occurs in notched specimens of polymers when subjected to fully compressive farfield cyclic loads.
(a) What are the mechanisms responsible for this effect?
(b) Discuss the possible effects of compressive stress amplitude and load ratio on the characteristics of crack initiation and growth from notches in polymers subjected to fully compressive cyclic loads.
(c) Can a fatigue crack be induced along the plane of a notch in a unidirectionally reinforced graphite-epoxy composite subjected to uniaxial cyclic compression, with the axis of the graphite fiber parallel to the compression axis and with the plane of the notch perpendicular to the compression axis?
For a sand, the maximum and minimum possible void ratios were determined to be 0.94 and 0.33 respectfully. Find the moist unit weight of sand in lb/ft^3compacted in the field at a relative density of 60%and moisture content of 10%Given Gs=2.65
A rigid 1ft^3 vessel contains R-134a originally at -20F and 27.7% quality. The refrigerant is then heated until its temperature is 100F. Calculate the heat transfer required to do this, in Btu.
Determine the acceleration of the initially stationary 20-kg body when the 50-N force P is applied as shown. The small wheels at B are ideal, and the feet at A are small.
The aim of this module is to develop practical and analytical understanding of the complex and multi-disciplinary nature of railways, and to provide students with an understanding of the economics of designing, building, maintaining and renewing ..
Briefly explain how each of the following influences the tensile or yield strength of a semicrystalline polymer and why: (a) Molecular weight (b) Degree of crystallinity (c) Deformation by drawing (d) Annealing of an undeformed material
You are driving a car your metered fuel flow is 5.97x10^5 csf if at the speed you are driving you are getting 40mpg what is your speed in mph and ft/s need formulas.
How are they weatherstripped? Do these windows make sense to you in terms of today's energy efficiency requirements and your own feelings about the room? How would you change them?
determine expressions for the initial angular acceleration of the head and its angular velocity ω as a function of the angle θ of rotation. Assume that the neck is relaxed so that no moment is applied to the head at O.
The water enters at 1 atm at 10 C and the flow rate through the turbine is 40 m3/s. The water is discharged from the turbine 200 m below the intake at 1 atm and the temperature of the water at the discharge is 10.2 C.
Battered piles are used on many construction projects as a permanent part of the element being constructed. Does this construction method have any play in the construction of a temporary earth retention system
A chair weighing 150 rests on a level floor that is not frictionless. A man pushes on the chair with a force = 43.0 that is directed at an angle of 34.0 with the horizontal. Assume that the chair is stationary but is on the verge of sliding.
What is the procedure standard test method for flash and fire points by cleveland open cup tester if there is animation or video is better....
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