Dynamic instability of glass-plastic shells carrying concentrated masses

Galaka, P. I.; Koval’chuk, P. S.; Mendelutsa, V. M.; Nosachenko, A. M.

doi:10.1007/bf00884073

Cited by 3 publications

(3 citation statements)

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“…Figure 5 illustrates conjugate modes with n = 3 of shell No. 7 [9] with the lower end clamped and the upper end free (Fig. 2).…”

Section: Natural Frequencies and Bending Modesmentioning

confidence: 98%

“…Figures 27 and 28 present some experimental results for shell No. 5 with an added mass [9,29]. For example, Fig.…”

Section: Forced Vibrationsmentioning

confidence: 99%

“…The influence of a small added mass on the parametric instability of cantilevered glassfiber-reinforced plastic shells was examined in [9,11,20,29]. The added mass M was two copper cylinders of radius R = 0.004 m and length l = 0.01 m attached to the free end of the shell, symmetrically about its mid-surface (Fig.…”

Section: Forced Vibrationsmentioning

confidence: 99%

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Experimental studies of the vibrations and dynamic stability of laminated composite shells

Kubenko

Koval’chuk

2009

Int Appl Mech

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The paper discusses the results of systematic experimental studies of vibrations and dynamic instability of thin shells of revolution made of laminated composite materials (glassfiber-reinforced plastics). The basic patterns in the dynamic deformation of shells during natural, forced, and parametric vibrations are considered. The damping parameters of natural vibrations are analyzed. The wave deformation modes of shells subject to periodic excitation are studied. The effect of long-term vibratory loading (torsion) on the dynamic characteristics of three-layer glassfiber-reinforced plastic shells is examined Keywords: composite, shell of revolution, frequencies and modes of vibration, dynamic instability, amplitude-frequency characteristic, running wave 1. Introduction. The unusual word "composite" came into use in the materials-science literature in the mid-1950s. It refers to then absolutely new, artificial anisotropic materials consisting of several components with different physical properties. The resulting material has properties qualitatively and quantitatively different from those of the components.The most popular structural composites are materials with oriented high-strength reinforcement (reinforced composites [1,3,4,13,25,26,32,34]) of which so-called glassfiber-reinforced plastics lead in practical use. These materials are produced by combining glass fibers or fabrics with polymeric resin as a matrix. Such materials are advantageous due to high mechanical strength at relatively low weight, corrosion resistance, relatively high thermal resistance, radio transparency, electric stability, etc. An exceptional value of fiberglass is that it makes it possible to influence the parameters of structural members being created. Glassfiber-reinforced plastic materials and structures with prescribed stiffness, weight, and other physical constraints are created in a single process cycle. This is very important because a not very complex process allows creating, in a relatively short time, mechanical objects of quite complex geometry, high strength, and low cost.It is therefore no wonder that the scope of application of fiberglass constantly extends. Nowadays glassfiber-reinforced plastic materials and structural elements are used in aircraft and rocket technology, transport space systems, chemical engineering, automotive industry, shipbuilding, pipeline construction, etc. This list could be extended.The basic stages in the development of the mechanics of composites and structures and results obtained to date are well reflected in many publications ([1, 4, 17, 25, 26, 32, etc.]) and in the multivolume collective monographs Mechanics of Composite Materials and Structural Members [in Russian] (1982-1983) and Mechanics of Composite Materials (1993Materials ( -2003 edited by academician A. N. Guz and issued by the S. P. Timoshenko Institute of Mechanics. Modern areas of research on the mechanics of composite materials and structures are indicated in the reviews [38,[40][41][42].In the former USSR, the S. P. Timoshenko...

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“…Figure 5 illustrates conjugate modes with n = 3 of shell No. 7 [9] with the lower end clamped and the upper end free (Fig. 2).…”

Section: Natural Frequencies and Bending Modesmentioning

confidence: 98%

“…Figures 27 and 28 present some experimental results for shell No. 5 with an added mass [9,29]. For example, Fig.…”

Section: Forced Vibrationsmentioning

confidence: 99%