TITLE:
Modeling and Simulation of a Cracked Beam with Different Location Using FEM
AUTHORS:
Rajib Karmaker, Ujjwal Kumar Deb, Amrita Das
KEYWORDS:
Vibration Characteristics, Crack Detection, Modal Analysis, Condition Monitoring, FEM
JOURNAL NAME:
Computational Water, Energy, and Environmental Engineering,
Vol.9 No.4,
October
20,
2020
ABSTRACT: Nowadays presence of crack
in different engineering structures becomes a serious threat to the
performance. Since most of the civil and mechanical structures may be damaged
due to material fatigue, mechanical vibration, environmental attack and
long-term service. Moreover, dynamical systems of a beam usually possess a
non-linear character, which causes practical difficulties on the model-based damage detection techniques.
This paper presents a novel approach to detect damage in a simply supported
beam. In this study, a numerical simulation using the Finite Element Method
(FEM) has been done to determine the frequencies to detect the crack in a
concrete beam of length 0.12 m and width 0.015 m. A vibration-based model is
employed to simulate the results by using COMSOL Multiphysics. At the tip, by
performing the computational analysis it is found that the presence of cracks
affects the natural frequencies of the concrete structure. It is observed that after applying load, the frequencies of the cracked beam have been changed with the variation of the location of the crack for all the modes of vibration. It also found that
maximum frequency reserved at the cracked point so it will also help us to
detect different hidden defects in any structure. A comparison
is also made with the experimental results. It is also found that the effect of
crack is more near the fixed end than at
the free end.