TY - CONF
AU - Quiroga, J.
AU - Mujica, L.E.
AU - Villamizar, R.
AU - Ruiz, M.
T3 - 9th European Workshop on Structural Health Monitoring
PY - 2018
Y1 - 2018
SP - 1
EP - 9
UR - http://hdl.handle.net/2117/123075
AB - In operation, some structural members are subjects to bending conditions. Velocity
variations of guided waves propagating in a stressed specimen are expected due to the
acoustoelasticity effect. In this work, a numerical study of the fundamental torsional mode
is performed in a hollow cylinder subjects to bending stress. Bending produces different
stresses along the horizontal axis of the pipe and through the specimen thickness.
Therefore, stress magnitudes are dependent on the longitudinal axis distance and the
radius. Acoustoelasticity predicts change in bulk velocities when the propagation is in a
stressed waveguide. Thus, the estimation of the phase velocity of a guided wave in a
bowing specimen is a complex task.
The objective of this study is to assess changes in the wavepacket dynamics due to stress
variations in a bending environment. In the numerical analysis by using Finite Element
Modeling (FEM), the stress gradient is imposed on the wave propagation analysis by
importing the results of the quasi-static simulation (bending) to the explicit solution FEM
scheme (Wave propagation).
Several bendingâ€™s stresses behavior are simulated (variable and constant along the
waveguide) and implemented to establish a relationship between the bending stress and
the change in the phase magnitude velocity. Variations in velocity are determined in the
time domain by comparing the current signals with the wavepacket without bending.
The importance of this study lies on the verification of the effects in the wave field (e.g.
velocity variations) caused by the bending and determine if they are enough to be used to
track stresses variations in the waveguide in an SHM system by using a pitch-catch
configuration.
T2 - European Workshop on Structural Health Monitoring
TI - Analysis of the torsional mode T(0,1) propagating in a bending pipe
ER -