Engineering, 29.10.2019 03:31 libertycooper
Asteel having a yield strength of 1,450 mn/m² and a fracture toughness of 55 mn/m3/2 is placed into service. quality control indicates that brittle inclusions, which fractured during the manufacturing of the steel, are present in the steel and that the maximum dimension of these inclusions is about 20 microns. this dimension can be considered to be the length of an existing interior crack in the steel. a thick disk of this plate is placed into service. a) show that the steel will yield plastically before cracks associated with the inclusions propagate through the material. take the value for parameter & = 1.05. b) what size would the inclusions have to be in order to have the material fracture before it yielded plastically? [ref: mechanical behavior of materials, courtney, 2000) hint: stress required to propagate a crack through is estimated by og = where c is the crack length (or 2c for an interior crack length), a is a constant on the order of unity and dependent on the crack geometry, k is the material property called the fracture toughness. f/2
Answers: 2
Engineering, 04.07.2019 18:10, ahmedeldyame
Aloaded platform of total mass 500 kg is supported by a dashpot and by a set of springs of effective stiffness 72 kn/m. it is observed that when the platform is depressed through a distance x = 12.5 cm below its equilibrium position and then released without any initial velocity; it reaches its equilibrium position in the shortest possible time without overshoot. find the position and velocity of the loaded platform 0.10 sec. after its release. if a further load of 400 kg is added to the platform, find, i) the frequency of damped vibrations, and i) the amplitude of vibration after 2 complete oscillations, given that the initial amplitude is 15 cm.
Answers: 1
Engineering, 04.07.2019 18:10, kevin72836
Consider a large isothermal enclosure that is maintained at a uniform temperature of 2000 k. calculate the emissive power of the radiation that emerges from a small aperture on the enclosure surface. what is the wavelength ? , below which 10% of the emission is concentrated? what is the wavelength ? 2 above which 10% of the emission is concentrated? determine the wavelength at which maximum spectral emissive power occurs. what is the irradiation incident on a small object placed inside the enclosure?
Answers: 2
Engineering, 04.07.2019 18:10, Tyrant4life
Draw the engineering stress-strain curve for (a) bcc; (b) fcc metals and mark important points.
Answers: 1
Asteel having a yield strength of 1,450 mn/m² and a fracture toughness of 55 mn/m3/2 is placed into...
Mathematics, 05.10.2020 01:01