Dynamic Stability of Suddenly Loaded Structures by George J. Simitses

By George J. Simitses

Dynamic instability or dynamic buckling as utilized to buildings is a time period that has been used to explain many periods of difficulties and plenty of actual phenomena. it isn't stunning, then, that the time period reveals a number of makes use of and interpretations between structural mechanicians. difficulties of parametric resonance, follower-force, whirling of rotating shafts, fluid-solid interplay, normal reaction of buildings to dynamic rather a lot, and a number of other others are all labeled lower than dynamic instability. Many analytical and experimental reviews of such difficulties are available in different books as both really good issues or the most subject matter. such sessions, parametric resonance and balance of nonconservative structures below static quite a bit (follower-force problems), shape the most subject matter of 2 books by way of V. V. Bolotin, which were translated from Russian. furthermore, remedy of aero elastic instabilities are available in different textbooks. ultimately, analytical and experimental reports of structural components and structures subjected to extreme quite a bit (of very brief length) are the point of interest of the hot monograph via Lindberg and Florence. the 1st bankruptcy makes an attempt to categorise a few of the "dynamic instability" phenomena by means of making an allowance for the character of the reason, the nature of the reaction, and the historical past of the matter. furthermore, a number of the strategies and methodologies as constructed and utilized by a few of the investigators for estimating severe stipulations for abruptly loaded elastic structures are totally defined. bankruptcy 2 demonstrates the strategies and standards for dynamic balance via basic mechanical types with one and levels of freedom.

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2 Criterion for Critical Conditions First the criterion is presented for a single-degree-of-freedom system and then it is extended to a two-degree-of-freedom system. Finally, some commentary is given concerning multi-degree-of-freedom systems. 2 Criterion for Critical Conditions 55 p .. 1. A step load. 2. Total potential curves for a single-degree-of-freedom system. 56 3. 1). To is also referred to as the time of release. Let U~ and T P denote the system total potential and kinetic energies, respectively.

Total potential versus displacement for various loads (model A). F or this load case also, since the system is a single-degree-of-freedom system, the minimum possible (MPCL) and minimum guaranteed (MGCL) critical loads are one and the same. 42). 2 Model B: A Load Imperfection Model 31 ... 5. Static and dynamic critical loads (model A). 6, is representative of eccentrically loaded structural systems, exhibiting limit point instability. The bar is rigid and of length L; the spring is linear of stiffness k, and the load eccentricity is denoted bye.

6) where U~ denotes the total potential "under zero load" and TO is the kinetic energy, given by (7) Note that T? is the initial kinetic energy imparted instantaneously by the impulsive load. 3 is a plot of (J~ versus f) - f}o. According to eq. _. r+8 2 I 0 FIGURE B e. r -9. 3. "Zero-load" total potential versus () - 2 (}o 0-80 0 (model A). if and only if (9) This implies that, for a given initial kinetic energy, eq. (7), and consequently a given impulse, say T? 3 - total potential presented in nondimensionalized form), motion is confined in the region e.

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