Characterization Of Core Materials In Marine Sandwich Panels Exposed To Slamming Loads

• Main Author: Uulas, Kristoffer
• Format: Others
• Language: English
• Published: KTH, Marina system 2012
• Online Access: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-101914

Design regulations for sandwich panels and shear strength characterization of sandwich core materials are considered. The panels included are situated in the bottom hull of planning crafts, in common for these panels are that they all are designed with regard to slamming pressures. An evaluation is performed where different regulations are compared to each other in regard to sandwich core characterizing methods. The evaluation is made for five different core materials and eight different design regulations. An extended design study is made where sandwich panels are designed in two different ships, the panels are designed in different regulation with different core materials. These designs are based on Matlab implementations of sandwich panel design regulations with complementary optimization routines to enable panel weight minimization. The study includes a comparison between the regulations and the use of higher utilization of the core material shear strength. Also included is an investigation on how shear elongation and dynamic load testing characterization affects the sandwich panel design. The result given by this work clearly shows that the characterization process of marine sandwich core materials could be improved. This leads to an investigation of a new way of characterizing the core material. This study uses the yield point as the material shear strength property. Included in the above mentioned study, is an investigation on how the safety factors used in the design regulation would be affected by the new characterization method.