Effects of steel fibers on failure mechanism of S-UHPC composite beams applied in the Arctic offshore structure

2021 ◽  
Vol 234 ◽  
pp. 109302
Author(s):  
Youzhu Lin ◽  
Jiachuan Yan ◽  
Zefang Wang ◽  
Chaoying Zou
Keyword(s):  
Failure Mechanism ◽  
Composite Beams ◽  
Steel Fibers ◽  
The Arctic ◽  
Offshore Structure

Failure mechanism and failure patterns of SCS composite beams with steel-fiber-reinforced UHPC

2020 ◽  
Vol 211 ◽  
pp. 110471 ◽  
Author(s):  
Youzhu Lin ◽  
Jiachuan Yan ◽  
Zefang Wang ◽  
Feng Fan ◽  
Yue Yang ◽  
...  
Keyword(s):  
Failure Mechanism ◽  
Steel Fiber ◽  
Composite Beams ◽  
Fiber Reinforced ◽  
Failure Patterns

Laboratory Testing of a Flexible Boom for Ice Management

1993 ◽  
Vol 115 (3) ◽  
pp. 149-153 ◽  
Author(s):  
S. Lo̸set ◽  
G. W. Timco
Keyword(s):  
Oil Spills ◽  
The Arctic ◽  
Small Scale ◽  
Test Results ◽  
Offshore Structure ◽  
Video Cameras ◽  
Ice Concentration ◽  
Broken Ice ◽  
Ice Field ◽  
Force Components

Combatting oil spills in the Arctic is a major challenge. Drilling or producing oil or gas in the marginal ice zone (MIZ) may allow booms to be deployed upstream of an offshore structure to clear the water of ice, thereby enabling conventional oil spill countermeasures to be used. Such a boom would be kept in place by two ice-going service vessels or by moored buoys. SINTEF NHL and NRC have performed a number of small-scale tests with a flexible boom in the NRC ice basin in Ottawa. The purpose of the tests was to measure the effectiveness of using a flexible boom for collecting ice, and to determine the loads associated with collecting the ice. In the tests, various boom configurations were towed against a broken ice field consisting of ice pieces typically 50–100 mm across and 30 mm thick. The ice concentration was usually 10/10, but it was reduced to 8/10 and 5/10 for two tests. The boom was towed at speeds of 20 and 50 mm-s−1. Both the width of the boom and the slackness of the boom were varied over reasonable ranges. Two six-component dynamometers were used to support the boom. Thus, the force components on each end of the boom were measured. Further, two video cameras were used to record the effectiveness of each boom configuration. In this paper, the full results of this test program are presented and the application of the test results to the full-scale situation are discussed. The tests show that, under certain conditions, the use of boom is feasible for ice management in oil-contaminated water.

A System for Measuring Ice-Induced Accelerations and Identifying Ice Actions on the CCGS Amundsen and a Swedish Atle-Class Icebreaker

2016 ◽  
Author(s):  
Hans-Martin Heyn ◽  
Roger Skjetne
Keyword(s):  
Sea Ice ◽  
Failure Mechanism ◽  
Arctic Sea Ice ◽  
Sensor System ◽  
The Arctic ◽  
Frequency Pattern ◽  
Svalbard Archipelago ◽  
Time Frequency ◽  
Ice Load ◽  
Frequency Decomposition

When ships operate in the Arctic, sea-ice induce an additional environmental load on the vessel. The ice load can vary significantly depending on the dominating ice-breaking failure mode. In this work a sensor system for measuring ice induced accelerations on the Canadian icebreaker CCGS Amundsen and a Swedish Atle-class icebreaker is presented. The sensor system consists of low-cost inertial measurement units. Ship-ice interaction data has been collected during expeditions along the coast of Labrador in Canada and in the Greenland Sea north of the Norwegian Svalbard archipelago. Depending on the failure mechanism of the interacting ice, vibrations at different frequencies are induced into the icebreaker ship. A time-frequency decomposition based on the Wigner-Ville distribution has been modified such that it is applicable to analysis of ice-load induced acceleration signals. Based on the frequency pattern of the induced vibrations, this novel method allows for evaluation of the intensity of the ice-loads and identification of the dominating ice failure mechanism, which is demonstrated for several ship-ice interaction events. The presented novel time-frequency decomposition for ice induced accelerations is a powerful tool for the identification of the threat imposed by sea-ice to a structure. In further work the time-frequency decomposition will be used as feedback in ice-capable control and monitoring systems for Arctic offshore operations.

Evaluation of the Ice Load Acting on an Arctic Offshore Structure With Different Ice Drifting Angle

2020 ◽  
Author(s):  
Young-Shik Kim ◽  
Yun-Ho Kim ◽  
Hyung-Do Song ◽  
Jin-Ho Jang ◽  
Solyoung Han ◽  
...  
Keyword(s):  
Evaluation Method ◽  
Offshore Structures ◽  
Mean Value ◽  
Experimental Methodology ◽  
The Arctic ◽  
Design Stage ◽  
Ocean Engineering ◽  
Offshore Structure ◽  
Ice Load ◽  
National University

Abstract In this study, an evaluation method and results for ice load acting on an Arctic offshore structure with various ice drifting angles are discussed. Korea Research Institute of Ships and Ocean Engineering (KRISO) has conducted a research project to develop a hull form design for year-round floating type offshore structures in the Arctic condition with dynamic positioning and mooring system. Six cooperating organizations participated in the project: Samsung Heavy Industry, Korean Register, Pusan National University, Korea Maritime & Ocean University, Dong-Eui University, and Inha Technical College. In the design stage of an Arctic offshore structure, ice load consideration is the key component for the safety and reliability analysis. However, there is no generally used tool for evaluation of ice load acting on an Arctic offshore structures. In this study, ice loads acting on an Arctic FPSO in managed ice conditions with various ice drifting angles are examined by experimental methodology. Dramatic mean value changes in ice load with different ice drifting angles are observed in the model test. This experimental ice load evaluation method can be applied to the other types of offshore structure which might operate in sea ice condition.

On the role of tin underlays for the prevention of thermal grooving in thin gold films

1986 ◽  
Vol 44 ◽  
pp. 732-733
Author(s):  
Jin Young Kim ◽  
R. E. Hummel ◽  
R. T. DeHoff
Keyword(s):  
Thin Film ◽  
Free Surface ◽  
Grain Boundary ◽  
Beneficial Effect ◽  
Failure Mechanism ◽  
Failure Mechanisms ◽  
Distinct Advantage ◽  
Gold Films ◽  
Gold Thin Film

Gold thin film metallizations in microelectronic circuits have a distinct advantage over those consisting of aluminum because they are less susceptible to electromigration. When electromigration is no longer the principal failure mechanism, other failure mechanisms caused by d.c. stressing might become important. In gold thin-film metallizations, grain boundary grooving is the principal failure mechanism.Previous studies have shown that grain boundary grooving in gold films can be prevented by an indium underlay between the substrate and gold. The beneficial effect of the In/Au composite film is mainly due to roughening of the surface of the gold films, redistribution of indium on the gold films and formation of In2O3 on the free surface and along the grain boundaries of the gold films during air annealing.

The Arctic Climate System

2005 ◽  
Author(s):  
Mark C. Serreze ◽  
Roger G. Barry
Keyword(s):  
Climate System ◽  
Arctic Climate ◽  
The Arctic
Sign in / Sign up

Export Citation Format

Share Document