Research in Sensibility of Locating Damage Methods Based on Mode Shape to Damage Intensity

Document Type: Persian

Authors

1 M.Sc. Student, MalekAshtar University, Tehran

2 Associate Professor, MalekAshtar University, Tehran

3 - Assistant Professor, MalekAshtar University, Tehran

Abstract

Structural health monitoring and damage detection is one of the most important subjects for mechanic and aerospace engineers. Structural fault can cause uncompensated problems for both human and environment. There are several methods for solving this problem, but the most useful methods are those which focuse on structural change in the vibrational properties. This paper presents a feasibility study on locating damage in circular cylindrical fiber-reinforced composite shells based on mode shape methods and the sensibility of different damage intensity. In view of the fact that damage detections based on shape mode which do not use unprepared data are less reliable, in comparison by other damage detection methods, and highly efficient method mentioned depended on accuracy of modal testing and data extraction. As a whole, this paper shows that among the methods which used damage oriented approach, the first hole with thickness of 4mm in the other stages are more able to detect damage detection.

Keywords


[1] Cawley P., Adams R.D., A Vibration Technique for Non-Destructive Testing of Fibre Composite Structures, Journal of Composite Materials, Vol. 13, 1979, pp.161–175.

 [2] Wolff T., Richardson M., Fault Detection in Structures From Changes in Their Modal Parameters, in Proc. of the 7th International Modal Analysis Conference, 1989, pp. 87–94.

[3]  Cornwell P., Doebling S.W., Farrar C.R., Application of the strain energy damage detection method to plate-like structures, Vol. 224, 1999, pp.  359–374.

[4]  Kim-Ho Ip, Ping-Cheung Tse, ,Locating damage in circular cylindrical composite shells based on frequency sensitivities and mode shapes, European Journal of Mechanics A/Solids, Vol. 21,2002, pp.  615 -628.

[5] Hu H. , Wang B., Lee C., Damage detection of surface cracks in composite laminates using modal analysis and strain energy method, Composite Structures, Vol. 74, 2006, pp. 399–405.

[6] Huiwen Hu, Jieming Wang, Damage detection of a woven fabric composite laminate using a modal strain energy method, Engineering Structures , 2009.

[7] Hu H., Wu C., Lu W., Damage Detection of circular hollow cylinder using modal strain energy and scannig damage index method, computers and structure, 2010.

[9] Maia N.M.M., Suna J.M.M., Almas E.A.M ,Damage Detection in Structures: From Mode Shaping to Frequency Response Function Methods,Mechanical Systems and Signal Processing, 2002.