Weld Crack Damage Monitoring Numerical Simulation on Honeycomb Steel Beam with Regular Hexagonal Holes
Cracks at weak locations in steel beams can be extremely hazardous to overall structural safety.To monitor the weld crack damage of honeycomb steel beam with regular hexagonal holes,the honeycomb steel beams with regular hexagonal holes with weld cracks was taken as the study object.The numerical monitoring model of honeycomb steel beam under different crack damage conditions based on piezoelectric sensing was established by using Abaqus numerical software.The influencing rule of piezoelectric signals in the crack damage honeycomb steel beam numerical model was studied.The relation expressions among crack length damage degree,crack depth damage degree and crack damage index were obtained.The stress wave propagation processes in honeycomb steel beam numerical model under different cracking conditions were also clarified.The result indicates that the weld crack damage monitoring numerical model of honeycomb steel beam with regular hexagonal holes is established based on the piezoelectric sensing principle.The Hanning window excitation signal and three-dimensional visco-elastic boundary are used in the numerical model.The boundary can well simulate the attenuation effect of stress wave passing through cracks.With the increase of crack length and depth,the piezoelectric signal time-domain amplitude attenuates to different degrees,and the crack depth has greater influence on the time-domain signals.The larger the crack damage degree is,the larger the crack damage index value is.The growth rate is the largest when the damage appears,indicating that the stress wave propagation is sensitive to the crack damage.When the crack length increases to the whole weld length,the piezoelectric signal time-domain amplitude decreases by 33.3%,and the stress near weld decreases by 37.8%.When the crack depth increases to the whole weld thickness,the piezoelectric signal time-domain amplitude attenuates by 95.4%,and the stress near weld decreases by 99.2%.At this time,the piezoelectric signal received by the sensor is tiny,and the stress wave received by the steel beam near weld is almost negligible.
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