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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?
A normally consolidated clay layer in the field has a thickness of 3.2 m with an average effective stress of 70 kN/m^2. A laboratory consolidation test on the clay gave the following results: Pressure (kN/m^2)=100, 200 Void Ratio=0.905, 0.815
A regular hexagonal pyramid has an upper base edge of 16 ft. and a lower base edge of 28 ft. if the volume of the frustum is 18041 ft^3., find the lateral area of the frustum.
Draw the three most popular brick bonds from memory.
A clean-earth trapezoidal channel with a bottom width of 1.8 m and a side surface slope 1:1 is to drain water uniformly at a rate of 8 m^3/s to a distance ok 1 km. If the flow depth is not to exceed 1.2 m,
A bowling ball is cast on the "alley" with a backspin of = 12 while its center has a forward velocity of = 7 Radius= 120 mm Determine the velocity of the contact point in contact with the alley.
Niagra falls measures 160 feet in height. Based on reasonable assumptions estimate the change in entropy for the water from the top of the falls to the bottom in kJ/kg*K.
An aggregate blend is composed of 53% coarse aggregate by weight (sp. gr. 2.702), 43% fine aggregate (sp. gr. 2.621), and 4% filler (sp. gr. 2.779)/
How many 3?4-inch diameter rivets are required to transmit 55,000 lb from the two angles to the gusset plate if the allowable shear stress in the rivets is 15,000 psi? Assume each rivet carries the same amount of load.
Determine the force in each member of the truss and state if it is in tension or compression. Set P=400 lb and d=4 ft.
The shift in the oxygen-hemoglobin dissociation curve with pH and PCO2 provides more oxygen available to tissues. As an example, consider the oxygen uptake by muscle tissue. The blood flow rate is 1 L/min under resting conditions.
Determine the Modulus of Elasticity of Concrete by the ACI formula for a concrete cylinder that has a unit weight of 120pcf (1920kg/m^3) and a compressive strength of 3000 psi (21MPa).
A rectangular gate 6 ft tall and 5 ft wide in the side of an open tank is held in place by the force F as indicated in the figure. The weight of the gate is negligible, and the hinge at O is frictionless.
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