Experimental and numerical assessment of fracture initiation in laser-welded webcore sandwich panels

Jani Romanoff, Mihkel Körgesaar, Heikki Remes, Pekka Palokangas

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

Abstract

We present experimental study on penetration resistance of all-steel laser-welded webcore sandwich panels. A low weight-to-stiffness ratio of these panels provide the means to develop cost and energy efficient and sustainable ships, when service, ultimate and fatigue limit states are considered. However, the response for accidental limit state remains uncertain as the failure of weld is often excluded from the analyses. In addition, the modelling effort in the conceptual design stage can be prohibitive, especially when considering accidental loads and fracture propagation. Therefore, clamped sandwich panels with dimensions of 1.2x1.2 m were penetrated with rigid indenter until onset of fracture. In parallel, tensile coupon tests were made with material extracted from the panels. The behaviour of panels was simulated using FEM with explicit, simplified consideration of welds. The assumptions and limitations of our modelling approaches is discussed with respect to fidelity of the simulations. It is also shown that the failure of sandwich panels is complex phenomenon where local bending of unit cells has significant effect to the failure mode predicted.
Original languageEnglish
Title of host publicationEighth International Conference on, Thin-Walled Structures - ICTWS 2018
Number of pages17
ISBN (Electronic)978-989-20-8665-1
Publication statusPublished - 2018
MoE publication typeA4 Article in a conference publication
EventInternational Conference on Thin-Walled Structures - Lisbon, Portugal
Duration: 24 Jul 201827 Jul 2018
Conference number: 8

Conference

ConferenceInternational Conference on Thin-Walled Structures
Abbreviated titleICTWS
CountryPortugal
CityLisbon
Period24/07/201827/07/2018

Keywords

  • Thin-walled structures
  • Steel Structures
  • Ductility
  • Sandwich Panels

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    Romanoff, J., Körgesaar, M., Remes, H., & Palokangas, P. (2018). Experimental and numerical assessment of fracture initiation in laser-welded webcore sandwich panels. In Eighth International Conference on, Thin-Walled Structures - ICTWS 2018