BibTeX:

@article{IJIRSTV3I2117,
     title={Crack Detection in Structural Beams by using Curvature Mode Shapes},
     author={Gollangi Raju and Lanka Ramesh},
     journal={International Journal for Innovative Research in Science & Technology},
     volume={3},
     number={2},
     pages={282--289},
     year={},
     url={http://www.ijirst.org/articles/IJIRSTV3I2117.pdf},
     publisher={IJIRST (International Journal for Innovative Research in Science & Technology)},
}

In recent years, the use of Aluminium structures in engineering application has increased. This is mainly due high structural performance, high corrosion resistance, tolerance of temperature; extreme fatigue resistance and high strength/weight ratio. However, some disorders like matrix cracking and delaminating could be caused by operational loading, aging, chemical attack, mechanical vibration, changing of ambient conditions and shock etc. during the service. The aim of paper is to develop a Vibration-based Structural Health Monitoring (SHM) method for cantilever beam specimens with the embedded artificial delamination. In the present work, the modal analysis has been carried out on cantilever with and without crack and observed the influence of crack on the beam by using vibration and mode shapes analysis, in this transverse open crack as considered as damage in the beam. Evaluation the natural frequencies and their corresponding mode shapes for different crack parameters (depths and locations) of the cantilever beam has been done by commercially available ANSYS software. Also, the experimental work is done by using Universal Vibration Machine with different crack depth; obtained experimental results are validated with simulation results, which give satisfactory results. Later, curvature mode shapes were calculated by using a central difference approximation to identify the crack location and quantification of the cracked beam. The location and depth corresponding to any peak on this curve becomes a possible crack location and depth. The identification procedure presented in this study is believed to provide a useful tool for detection of medium size crack in a cantilever beam applications.

Structural Health Monitoring, Finite Element Method, Modal Parameters, Universal Vibration Machine, Central Difference Approximation