Wyniki wyszukiwania - BazTech

Ograniczanie wyników

Znaleziono wyników: 2

Liczba wyników na stronie

Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych: layered composite materials

Sortuj według:

Ogranicz wyniki do:

Determination of dispersion curves for composite materials with the use of stiffness matrix method

Barski M., Pająk P.

Acta Mechanica et Automatica

2017

Vol. 11, no. 2

121--128

Elastic waves used in Structural Health Monitoring systems have strongly dispersive character. Therefore it is necessary to determine the appropriate dispersion curves in order to proper interpretation of a received dynamic response of an analyzed structure. The shape of dispersion curves as well as number of wave modes depends on mechanical properties of layers and frequency of an excited signal. In the current work, the relatively new approach is utilized, namely stiffness matrix method. In contrast to transfer matrix method or global matrix method, this algorithm is considered as numerically unconditionally stable and as effective as transfer matrix approach. However, it will be demonstrated that in the case of hybrid composites, where mechanical properties of particular layers differ significantly, obtaining results could be difficult. The theoretical relationships are presented for the composite plate of arbitrary stacking sequence and arbitrary direction of elastic waves propagation. As a numerical example, the dispersion curves are estimated for the lamina, which is made of carbon fibers and epoxy resin. It is assumed that elastic waves travel in the parallel, perpendicular and arbitrary direction to the fibers in lamina. Next, the dispersion curves are determined for the following laminate [0°, 90°, 0°, 90°, 0°, 90°, 0°, 90°] and hybrid [Al, 90°, 0°, 90°, 0°, 90°, 0°], where Al is the aluminum alloy PA38 and the rest of layers are made of carbon fibers and epoxy resin.

Application of unconventional materials on primary structural parts of machine tools

Smolik J., Kulisek V.

Journal of Machine Engineering

2009

Vol. 9, No. 2

93--105

The paper is mainly focused on possible domains of application of composite sandwich materials in the field of machine tools. A theoretical case study analyzing the effect of application of composite sandwich materials on the dynamics of the X-feed-drive axis of the horizontal milling machine is presented. The benefits of composite sandwich materials are discussed and summarized in the context of modern machine tools and their desired static and dynamic properties. Experimental case study is also presented.