2 results
Now showing1 - 2 of 2
- Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: without files , Reconstructing beam bending strength of arctic second year ice from small disk bending tests(American Society of Mechanical Engineers (ASME), 2025-06); The flexural strength of ice is one of the most significant strength parameters for the design of ships and marine structures in ice. By an unwritten convention the flexural strength refers to beam bending tests in ice. For this engineering formulas are derived that support engineering design. However, both climate and engineering fields are changing and ice properties still need to be assessed by in-situ measurements. Beam bending tests in full-scale, i.e. nature, are laborious and require both significant time and equipment. In the light of this an alternative method based on thin disk bending tests gained from drilled standard ice cores is presented. The method of testing small disks is introduced in the late 1960ies and has gained little attention in the community. The method presented utilizes tested disk samples throughout the entire ice thickness in order to assess the distribution of properties, while using this information reconstructing the global behavior of an ice cantilever beam in flexure. A numerical model of a virtual cantilever ice beam experiment is built from which the reference flexural strength of a cantilever beam is derived. The determined flexural strength is reduced by a stress concentration factor accounting for the notch effect in the beam-root transition. This stress concentration factor is determined numerically for different ratios of radius and beam width. Finally, the obtained strength value is scaled accounting for the increase of flaws in larger ice specimens. The approach is compared with literature data and evaluated in terms of its validity and robustness. The method also indicates the problem of missing standards for flexural strength determination.Publicationtype: Conference Paper39 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: with files , A comprehensive approach to scenario-based risk management for Arctic waters(Taylor & Francis, 2022-03-22); ; ; ; While society benefits from Arctic shipping, it is necessary to recognize that ship operations in Arctic waters pose significant risks to people, the environment, and property. To support the management of those risks, this article presents a comprehensive approach addressing both short-term operational risks, as well as risks related to long-term extreme ice loads. For the management of short-term operational risks, an extended version of the Polar Operational Limit Assessment Risk Indexing System (POLARIS) considering the magnitude of the consequences of potential adverse events is proposed. For the management of risks related to long-term extreme ice loads, guidelines are provided for using existing analytical, numerical, and semi-empirical methods. In addition, to support the design of ice class ship structures, the article proposes a novel approach that can be used in the conceptual design phase for the determination of preliminary scantlings for primary hull structural members.Publicationtype: Journal ArticleScopus© Citations 11 47 272