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In mechanics, stress is a measure of the internal forces acting within a deformable body. Quantitatively, it is a measure of the average force per unit area of a surface within the body on which internal forces act. These internal forces are produced between the particles in the body as a reaction to external forces applied on the body. In materials without microstructure (these are materials whose microstructure does not play an important role in the mechanical deformation), these internal forces are distributed continuously within the volume of the material body, and result in deformation of the body's shape. Beyond certain limits of material strength, this can lead to a permanent change of shape or physical failure. The dimension of stress is that of pressure, and therefore the SI unit for stress is the pascal (Pa). A three-dimensional stress eld in a material can be represented as a sym- metric matrix of the following form:
where the diagonal terms represent tensile or compressive stresses and the o-diagonal terms represent shear stresses.
Q. Select the pairs of isotopes, isobars and isotones from the following nuclei: 11 Na 22 , 12 Mg 24 , 11 Na 24 , 10 Ne 23 Isotopes are 11 Na 22 , 11
If a force applied on a body causes a alteration in the normal positions of the molecules of the body, resulting in a alteration in the configuration of the object either in length
Generate and plot a sampled sine wave with fs=8kHz, of 4 seconds duration, with frequency ?0 = ?/10 and amplitude A = 1.2. The waveform equation is x(n) = A sin n?
working and construction of fabry perot interferometer
history
Michelson Morley Experiment The Michelson-Morley experiment was performed within the year of 1887 through Albert Michelson and Edward Morley at what is presently Case Western
Construction & chemical action of Cell: In cells, an electrolyte separates two charge collecting materials called electrodes, to which external connections are made. The electr
Cutting a glass dish from a used electric bulb The hemispherical bottom of an electric light bulb gives a useful glass dish; a soldering iron can be used to cut it off. put the
Q. Give the basic assumptions made in free electron model of solid. OR Write down basic postulates of Sommerfield's free electron gas model. Show that the number of ene
The total number of neutrons in dipositive zinc ions with mass number 70 is: (1) 34 (2) 40 (3) 36 (4) 38 Ans:40
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