The effect of an underwater explosion on a ship

Szturomski, Bogdan

doi:10.5604/0860889x.1172074

Cited by 14 publications

(26 citation statements)

References 1 publication

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“…The maximum breaking force is then converted into the stress corresponding to the ultimate strength in dynamic tensile strength. The strain rate is defined as the ratio of the tearing speed of the sample to its measured length [ 8 ] as follows:

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Section: Resultsmentioning

confidence: 99%

Material Properties of HY 80 Steel after 55 Years of Operation for FEM Applications

Szturomski

Kiciński

2021

Materials

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The paper presents the results of testing the properties of HY 80 steel from the hull of a Kobben class 207 submarine after 60 years of operation in extreme sea conditions. Steels from the HY family in the post-war period were used to build American and German submarines. For the obtained fragment of steel from the hull of the Polish submarine ORP Jastrząb (ORP-Boat of the Republic of Poland), static tensile tests were performed on an MTS testing machine. Dynamic tensile tests were carried out on a rotary hammer for the strain rate in the range of 500–2000 s−1. Results: Based on the obtained results, the Johnson–Cook model and the failure parameters of HY 80 steel in terms of the finite element method (FEM) were developed. Conclusion: This model can be used to simulate fast-changing processes such as resistance of structures to collisions, shelling, and the impact of pressure waves caused by explosions in water and air related to submarines.

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Section: Resultsmentioning

confidence: 99%

Material Properties of HY 80 Steel after 55 Years of Operation for FEM Applications

Szturomski

Kiciński

2021

Materials

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“…Under carefully controlled scenarios, the range at which a ship incurs specific types of damage can be calculated with relative accuracy and is small compared to the distance at which a ship might reasonably cause a mine to detonate . In our computational experiments, we assume threat radii that vary from 300 to 400 yards based on reasonable boundaries of actuation, found during operational testing .…”

Section: Preliminariesmentioning

confidence: 99%

Minimum‐risk routing through a mapped minefield

Richards

Odom²,

Morton

et al. 2018

Networks

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We embed a directed graph G(V, E) in a representation of a naval minefield; vertices V represent waypoints and edges E denote possible segments for ship transit. A new model identifies a simple s‐t path through the minefield that minimizes the risk of incurring unacceptable damage from threats, that is, mine detonations. Traditional “edge‐additive” models rely on shortest‐path algorithms that over‐accumulate risk along a path. Our “threat‐additive” approach accumulates risk based upon the path's closest point of approach to each mine. We formulate and solve this model (1) using an integer program (IP) and its stronger variant, and (2) via an A* search algorithm. Preprocessing routines are key to reducing run times. We investigate the relative merits, both with respect to solution quality and requisite computational effort, of two types of graphs, one based on a rectilinear scheme and one based on Voronoi diagrams. We find that graphs based on Voronoi diagrams provide higher quality solutions with less computational effort, and that the A* search procedure requires less computational effort than solving instances of our models as IPs.

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“…In contrast to the early mines used by U.S. forces in the 18th and 19th centuries that had very specific operating thresholds and required manual detonation or direct contact , modern mines can be placed in almost any littoral environment (i.e., coastal shallows) and can be activated by a myriad signals, including physical contact, sound waves, or electromagnetic signatures . With specific knowledge about mine type, water depth, and ship characteristics, it is possible to measure with relative accuracy the severity of damage a mine can inflict on a passing ship . In evaluating potential paths, however, researchers tend to focus on determining the likelihood of avoiding damage.…”

Section: Related Workmentioning

confidence: 99%

Navigating free‐floating minefields via time‐varying Voronoi graphs

Richards

Mehta

2018

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Despite their illegality, untethered free-floating naval mines are increasingly employed as part of maritime area-denial operations. By ignoring international treaties, these mines require less effort to acquire and deploy, and result in a far more dynamic-threat environment. In order to assist commanders during breach operation planning, we develop several algorithms that generate a minimum-risk journey through a field of drifting mines. Using Voronoi graphs to capture a series of static snapshots of the operational area, we present a practical methodology for building a fully connected time-varying graph (, ). Vertices  are defined as specific times and locations, and edges  define the continuous movement of a ship with simple parametric equations. The length, acceleration and risk of each edge is calculated and employed by a threat-additive A * search to quickly find a plausible, minimum-risk journey through a given minefield within a specific time frame. Using real-world data for a modern-day port and minefields of variable density, we find navigable paths that incur acceptable risk in less than 2 minutes on average. We also introduce several methods for reducing the size of (, ) and the time required for its generation.

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The effect of an underwater explosion on a ship

Cited by 14 publications

References 1 publication

Material Properties of HY 80 Steel after 55 Years of Operation for FEM Applications

Material Properties of HY 80 Steel after 55 Years of Operation for FEM Applications

Minimum‐risk routing through a mapped minefield

Navigating free‐floating minefields via time‐varying Voronoi graphs

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