Fracture mechanics approach to assess the progressive structural failure of a damaged ship

2013 ◽  
pp. 77-84
Author(s):  
A Bardetsky
Keyword(s):  
Fracture Mechanics ◽  
Structural Failure ◽  
Damaged Ship

scholarly journals Fracture Mechanics Analysis on Structural Failure of Ship

1984 ◽  
Vol 1984 (156) ◽  
pp. 542-549
Author(s):  
Yoshiro Masuda ◽  
Hitoshi Ikeda ◽  
Yasuharu Tsutsui ◽  
Yukio Ino ◽  
Kenji Yasuda
Keyword(s):  
Fracture Mechanics ◽  
Structural Failure ◽  
Mechanics Analysis

Analytical Prediction of Progressive Structural Failure of a Damaged Ship for Rapid Response Damage Assessment

2014 ◽  
Author(s):  
Alexander Bardetsky ◽  
AiKuo Lee
Keyword(s):  
Decision Making ◽  
Crack Propagation ◽  
Residual Strength ◽  
Damage Assessment ◽  
Rapid Response ◽  
Analytical Prediction ◽  
Fe Modeling ◽  
Structural Failure ◽  
Sea Wave ◽  
Damaged Ship

The assessment of the residual strength of a damaged ship is a key element of ABS’ Rapid Response Damage Assessment (RRDA) program. When determining the residual strength, it is important to understand how the initial structural damage can spread in response to sea wave dynamic loads and can lead to a gradual reduction of the ship’s residual strength. This progressive, time-dependent structural failure caused by cracks emanating from the damaged area could eventually lead to total hull girder collapse. This is why it is important to quantify the progressive structural failure over time when assessing the residual strength of the damaged ship. Until now, progressive structural failure analysis has been conducted numerically using the Finite Element (FE) modeling approach. While this approach is accurate, it is extremely time-consuming, which makes it inappropriate for incident response, where time for decision-making is very limited. In order to overcome this limitation, an alternative analytical modeling approach for assessing the progressive structural failure of a damaged ship is proposed. This paper presents a new comprehensive procedure for analytical prediction of crack propagation under sea wave loading using spectral fatigue analysis, beam theory, fracture mechanics and an equivalent stress intensity factor (SIF) range concept. The SIF range obtained analytically is validated by FE modeling of a damaged ship subjected to sea wave dynamic loading. The procedure for analytical prediction of the crack propagation is demonstrated for a typical, modern 170,000 DWT bulk carrier in a full load condition. The results of this research can be used to support informed decision-making when analyzing a vessel’s residual strength for the transit voyage from the accident location to a repair facility.

Piston Mode and Sloshing Resonances in a Damaged Ship

2010 ◽  
Author(s):  
X. J. Kong ◽  
O. M. Faltinsen
Keyword(s):  
Theoretical Analysis ◽  
Hydrodynamic Coefficients ◽  
Response Functions ◽  
Sea Waves ◽  
Structural Failure ◽  
Unified Approach ◽  
Hydrodynamic Problem ◽  
Physical Problems ◽  
Piston Mode ◽  
Damaged Ship

This work investigates the motions of a damaged ship in regular beam sea waves. The ship geometry including the damaged compartment (with opening) is modeled by using a unified approach called Hull Reshaped Method [1] and the hydrodynamic problem is solved by applying a 3D potential flow code. Linear hydrodynamic coefficients and excitation loads together with experimental nonlinear viscous roll damping are used in the calculations of the motion response functions. In addition to the natural roll resonance, the piston mode and sloshing resonances are numerically observed. By applying simplified theoretical analysis, these two resonances are further confirmed for a damaged ship with opening in the hull defined by the SOLAS rule [2]. The resulting physical problems, for instance, dry bottom, roof impact and possible structural failure in the damaged compartment are predicted from the simulations.

Fracture Mechanics and Nondestructive Testing of Brittle Materials

1972 ◽  
Vol 94 (1) ◽  
pp. 291-297 ◽  
Author(s):  
W. G. Clark
Keyword(s):  
Fracture Mechanics ◽  
Nondestructive Testing ◽  
Fracture Behavior ◽  
Brittle Materials ◽  
Orientation Distribution ◽  
Nondestructive Inspection ◽  
Structural Failure ◽  
Practical Engineering ◽  
Basic Concepts ◽  
Defect Morphology

The fracture mechanics approach to the development of meaningful nondestructive inspection requirements is presented. The basic concepts underlying the technology are reviewed and the practical engineering aspects of this approach to the prevention of structural failure are demonstrated. Particular emphasis is placed on evaluating the influence of defect morphology (size, shape, orientation, distribution, etc.) on fracture behavior. A hypothetical inspection problem is included and the pertinent considerations associated with the development of a realistic nondestructive inspection specification are discussed in detail.

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