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| Titel: |
Large Deformations of Rigid-Viscoplastic Structures under Impulsive and Pressure Loading |
| Auteur: |
KALISZKY, s. |
| Verschenen in: |
Mechanics based design of structures & machines |
| Paginering: | Jaargang 1 (1972) nr. 3 pagina's 295-317 |
| Jaar: |
1972 |
| Inhoud: |
It has recently been shown that by imposing a time-independent kine-matically admissible displacement field on a rigid-plastic structure the approximate determination of its response to pressure or impulsive loading can be reduced to the investigation of an equivalent one-degree-of-freedom system. In the present paper this approximation is generalized to structures of rigid-viscoplastic material undergoing moderately large deformations. The analysis leads to a nonlinear second-order differential equation the solution of which is obtained by using numerical methods. The investigation of a circular plate shows that this approximate method leads to simple calculations and its accuracy is satisfactory. As expected, the numerical results confirm that strain-rate sensitivity and geometry changes have an important influence on the maximum permanent deflections. In addition, a comparative study shows that the usual approximation according to which the pressure pulse is replaced by an equivalent impulse generally does not lead to the correct solution of a dynamically loaded structure. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
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