Experimental Studies on the Loss Factor of Alternately Laminated Anisotropic Damped Thin Plates

Abstract

Optimization designs on the parameters of seven-layers of alternately laminated thin plate structures have been carried out through two orthogonal experiments and a dynamic mechanical analysis apparatus (DMA Q800), including the variations of damping material species, the fiber orientation angle in constrained layers and the thickness of the damping layer. The effects of these parameters on the loss factor of the structures have been investigated. It may provide some experimental basis for new anisotropic design system of the alternately laminated damped structures. Firstly, the experimental results show that the second and the sixth damping layers are respectively the best-influencing layers on the frequency range and the temperature range of the loss factor. As for the second damping layer, the greater the thickness, the better the frequency characteristics of internal friction. Secondly, the effects of the second outer constrained layer on the loss factor are the highest, and the structural damping characteristics are best when the orientation angle is close to 90. Finally, temperature and frequency characteristics of the loss factor can be optimized with different damped materials in different damping layers.

Keywords

alternate laminating anisotropy damped structures the loss factor optimization

Get full access to this article

View all access options for this article.

References

Ross, R. , Ungar, E. E. and Kerwin, E. M. (1959). Damping of Plate Flexural Vibrations by Means of Viscoelastic Laminate [R]. In: Ruzicka, T. E. (ed.), Structural Damping, ASME, New York , Sec. III, pp. 48–88.

Alam, N. and Asnani, N. T. (1987). Refined Vibration and Damping Analysis of Multilayered Rectangular Plates [J], J . Sound Vib., 118(1): 35–45 .

Dalenbring, M. (September 2002). Experimental Material Damping Estimation for Planar Isotropic Laminate Structures [J] , International Journal of Solids and Structures, 39(19): 5053–5079 .

Mukhopadhyay, K. and Kingsbury, H. P. (1976). On the Dynamic Response of a Rectangular Sandwich Plate with Viscoelastic Core and Generally Orthotropic Facings, J . Sound Vibr., 47(3): 347–358 .

Fujimoto, J. and Tamura, T. (July 1991). Mechanical Properties for CFRP/Damping-material Laminates, In: Presented at ‘International Conference on Composite Materials’, Honolulu, Hawaii.

Barrett, D. J. (1990). An Anisotropic Laminated Plate Theory [R]. AD A234 446/3. NADC-90066-60, pp. 1–59.

Yim, Jong Hee Cho , Shee Yong, Seo , Yun Jong and Jang, Bor Z. (2003). A Study on Material of 0 Laminated Composite Sandwich Cantilever Beams with a Viscoelastic Layer [J] , Composite Structures, 60: 367–374 .

Cao Yihua , Li Mingjun , Su, Yuan and Sun, Xiangchun . (2002). Studies on Damping Characteristics and Parameter Optimization of Anistotropic Laminated Structure [J] , Aircraft Engineering and Aerospace Technology, 74(4): 332–337 .

Rao Mohan, D. , Raghu, Echempati and Satish, Nadella (1997). Dynamic Analysis and Damping of Composite Structure Embedded with Viscoelastic Layers [J] , Compos. Part B: Eng., 28(3): 547–554 .

10.

Rao Mohan, D. and He ShuLin (1993). Dynamic Analysis and Design of Laminated Composite Beams with Multiple Viscoelastic Layers [J] , ALAA Journal, 31(4): 736–745 .

11.

Chandra, R. , Singh, S. P. and Gupta, K. (1999). Damping Studies in Fiber-reinforced Composites – A Review [J] , Composite Structures, 46: 41–51 .

12.

Xia Houchun (1998). A New Vibration Damping Material—Development and Application of Fiber Enhance Viscoelastic Damping Polymers, In: Proceedings of the Third Youth Academic Annual Congress by the Chinese Science Technique Association, Sec. of the Material Science and Engineering Techniques, pp. 12–17, The Chinese Science Technique Association, China .