Dynamic characteristic of partially debonded sandwich of ferry ro-ro’s car deck: a numerical modeling

Abstract

The dynamic behavior of a partially debonded Ferry Ro-Ro’s sandwich car deck is investigated by using commercial finite element software ABAQUS. Debonding in the car deck model is estimated by comparing the dynamic responses of the fully intact and damaged model of the bonding condition. The influence of the debonding ratio is investigated by free vibration analysis using Lanczos iteration method. The dynamic response of the car deck model is loaded with harmonic excitation and is examined in detail. The transverse displacements, velocities, accelerations, longitudinal strains, and phase portraits are investigated in the central point of the damaged area. To evaluate the effect of inserting the spring contact element during the dynamic analysis, both debonded models with and without spring contact elements are examined. From the report, it can be concluded that the dynamic analysis which relies on the modal analysis can be used to diagnose the possibility of debonding problem in the car deck structure. The natural frequencies of the debonded model decrease due to the presence of discontinuity in the debonded region. Further, the discontinuity also creates locally concentrated deformation and significantly affects the short-term time response.

Dynamic response evaluation due to construction system modification of 155 m barge ship using finite element method

“…A thorough investigation using various material types and structural locations yields a new perspective. A structural assessment due to static and dynamic load in the Ferry Ro-Ro ship's car deck is thoroughly investigated [12,13]. Sandwiches with various material types, stiffener configurations, and load types contributed to stress reductions of approximately 14.6 -15.8% and weight savings of roughly 8.87% -11.6%.…”

Effect of debonding damage on transient dynamic response on stern ramp door of passenger ship 6311 GT

“…In this study, ship data and ramp door models will be used as in work [7]. Ship and ramp door data can be seen in Table 1.…”

“…This method uses the dynamic response of the structure to identify the existing damage to the sandwich material. Previous studies [7][8][9][10][11][12] for the effect of debonding damage to the ramp door structure with dynamic response used are natural frequencies. The results of this study indicate that there will be a reduction in the natural frequency for debonding ramp door structures, and the natural frequency value will decrease as the damage ratio increases [13][14][15][16][17][18][19][20].…”