Impulsive Motion

In order to compare the magnitude of bending stresses and shear stresses in beams under the action of impulsive forces, the values of these stresses are determined from the known differential equations for the Timoshenko beam. It is found that in the early stages, soon after the initiation of the motion, the shear stresses are of much larger magnitude than the bending stresses. This result indicates that for sufficiently large initial velocities first yielding will be in shear, a matter of consequence in plastic analysis.

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Unsteady mixed convection flow in the stagnation region of a heated vertical plate due to impulsive motion

International Journal of Heat and Mass Transfer ◽

10.1016/s0017-9310(01)00228-9 ◽

2002 ◽

Vol 45 (6) ◽

pp. 1345-1352 ◽

Cited By ~ 49

Author(s):

Rajeswari Seshadri ◽

Nalini Sreeshylan ◽

G. Nath

Keyword(s):

Mixed Convection ◽

Vertical Plate ◽

Convection Flow ◽

Mixed Convection Flow ◽

Impulsive Motion ◽

Stagnation Region ◽

Unsteady Mixed Convection

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Development of the flow induced by a piston moving impulsively in a dusty gas

Proceedings of the Royal Society of London Series A - Mathematical and Physical Sciences ◽

10.1098/rspa.1985.0016 ◽

1985 ◽

Vol 397 (1813) ◽

pp. 295-309 ◽

Cited By ~ 41

Keyword(s):

Shock Wave ◽

Equations Of Motion ◽

Wave Structure ◽

Elastic Collision ◽

Dust Particles ◽

Dusty Gas ◽

Impulsive Motion ◽

Dependent Change ◽

Piston Speed ◽

Time Dependent Change

The flow resulting from the impulsive motion of a piston moving at constant speed in a dusty gas is studied analytically and numerically. An idealized equilibrium-gas approximation is used to discuss the effects of piston speed and mass concentration of dust particles on the eventually formed shock wave. The detailed time-dependent change of the flow structure is studied by solving the equations of motion numerically. A partly dispersed shock-wave structure is formed at a high piston speed and a fully dispersed shock at a low piston speed. Two situations are considered, where the particles striking the piston experience an elastic collision, or where they stick to its surface. Significant effects on the flow produced by particles that reflect from the piston surface are discussed and clarified.

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