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Equation for principal stresses and principal planes:
Derive equation for principal stresses and principal planes for the element subjected to compound stresses.
Sol.: For state of stress shown in the given figure the normal stress and shear stress on any oblique plane inclined at angle θ is determined by, As the principal plane should carry normal stress, shear stress acting on it is to be zero. That is, This provides one of the principal planes, other principal plane shall be perpendicular to this plane.
Substituting value of θ in σn expression by rearranging as below. It provides the values of principal stresses. The largest one is called as major and smaller is called as minor principal stress.
Dead Centre The position of the working piston and the moving parts which are mechanically connected to it, at the moment when the direction of the piston motion is reserved
IMPULS E TURBINE: The steam turbine in which the steam expands while passing through nozzle and remains at the constant pressure over the blades is called as impulse turbine.
In an engine working on Diesel cycle inlet pressure and tem are 1 bar and 17 o c respectively. Pressure at the end of adiabatic compression is 35 bar. He ratio of expansion i.e. af
Spindle complaint Gear shift : Check spindle comp. Gear shift for bend, rust, arms for bend and arm spring condition and availability.
By introducing their model of neural excitability in 1952, Alan Lloyd Hodgkin and Andrew Huxley not only shed light on the mechanism underlying a very important phenomenon in Physi
Scrapper: Scrappers are used to scrap gasket or other such materials from flat or irregular surface. Scrappers of several sizes are shown in Figure. Figure : Scrapper
Q. Insulation on Flanges and Valves? Valves, flanges, and unions shall not normally be insulated unless specified by OWNER. All other fittings are to be insulated. Fittings
what is structure with example
BASIC DEFINITIONS - Air transportation: A civil engineer dealing with airport engineering shall have to know the precise meaning of some terms. These are defined below :
A nozzle of 50 mm. dia. delivers a stream of water that strikes a flat plate which is held normal to the axis of stream. If the issuing jet has a velocity of 15 m/sec., Determin
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