Behavior of Adhesively Bonded Steel Double Hat-Section Components Under Lateral Impact Loading

Paper #:
  • 2018-01-1447

Published:
  • 2018-04-03
Abstract:
Recent experimental studies on the behavior of adhesively-bonded steel double-hat section components under axial impact loading have produced encouraging results in terms of load-displacement response and energy absorption when compared to traditional spot-welded hat sections. However, it is extremely difficult to come across any published work on the behavior of such components under transverse impact loading keeping in mind applications such as automotive body structures subject to lateral/side impact. In the present work, experimental lateral impact studies have been carried out on adhesively-bonded double-hat section components and the performance of such components has been compared against their conventional spot-welded and hybrid counterparts. It is clarified that hybrid components in the present context refer to adhesively-bonded hat sections with a few spot welds only aimed at preventing catastrophic flange separations. Drop-weight impact tests are carried out with a wedge-shaped striker attached underneath a rigid impactor by varying its mass and drop height. Using a load cell and a high speed data acquisition system, load-time histories are recorded which are converted into load-displacement responses through time-integration and post-processing of images yielded by a high speed camera. As in the case of axial impact behavior of adhesively-bonded steel hat sections, the performance of these components under lateral impact is found to be satisfactory in relation to the conventional spot-welded hat sections although flange separation is expectedly more prominent in the present class of components. High speed camera images provide insights into the progression of overall deformation of a hat section component as well as the deformation in its flanges at various instants of a lateral impact event.
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