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Materials Technology

A Computational Investigation on the Effects of Hull Geometry and Stiffeners on the Axial Crushing Strength and Behavior of Aluminum High Speed Crafts

[+] Author and Article Information
Mohammad Reza Khedmati

Faculty of Marine Technology, Amirkabir University of Technology, Hafez Avenue, No. 424, Tehran 15914, Irankhedmati@aut.ac.ir

Iraj Keivanfar

Faculty of Marine Technology, Amirkabir University of Technology, Hafez Avenue, No. 424, Tehran 15914, IranIrajk1far@yahoo.com

J. Offshore Mech. Arct. Eng 133(3), 031403 (Mar 31, 2011) (10 pages) doi:10.1115/1.4002736 History: Received October 28, 2009; Revised June 14, 2010; Published March 31, 2011; Online March 31, 2011

This work focuses on the crushing behavior of aluminum high speed crafts in the case of axial bow collision to a rigid structure. LS-DYNA code is used in analyses. Some available experimental prototypes tested under axial loading are first successfully simulated in the LS-DYNA environment. Then the effects of hull breadth, hull curvature, and longitudinal stiffeners on the crushing strength and behavior of the aluminum high speed craft are investigated in detail.

Copyright © 2011 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Details of the bow region of aluminum high speed craft under consideration: (a) 3D wire view showing location of different stations (all dimensions in mm): (1) deck center girder: FB 50×6 mm2, (2) deck stiffener: FB 40×4 mm2, (3) transverse watertight bulkhead, (4) side shell plating, (5) side shell plating stiffener: FB 50×4 mm2, (6) side shell plating stiffener: LB 80×50×4 mm3 (7) side shell plating stiffener: LB 200×50×20×4 mm4, (8) bottom shell plating stiffener: LB 80×50×4 mm3, (9) bottom shell plating, (10) bottom shell plating stiffener: TB 100×50×5 mm3, (11) draft, (12) length, (13) breadth, and (14) deck; (b) different parts of the bow region

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Figure 2

Geometric dimensions of transverse frame and longitudinal stiffening elements at station E (all dimensions in mm)

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Figure 3

Different parametric models for study: (a) wide bow with curvature, (b) narrow bow with curvature, (c) wide bow without curvature, and (d) narrow bow without curvature

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Figure 4

Average stress-average strain relationship for aluminum material

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Figure 5

Aamlid’s model

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Figure 6

Detailed geometry of Aamlid’s model (all dimensions in mm)

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Figure 7

Schematic views of Aamlid’s model tests and numerical simulations

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Figure 8

Experimentally obtained deformation of Aamlid’s model under axial crushing load (14)

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Figure 9

Numerically obtained deformation of Aamlid’s model under axial crushing load

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Figure 10

Numerically obtained force-deformation curve of Aamlid’s model under axial crushing load

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Figure 11

Comparison of the force-deformation curves for wide and narrow bow models without curvature under axial crushing load

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Figure 12

Comparison of the force-deformation curves for narrow bow models with/without curvature under axial crushing load

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Figure 13

Comparison of the force-deformation curves for wide bow models with/without curvature under axial crushing load

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Figure 14

Comparison of the force-deformation curves for wide and narrow bow models with curvature under axial crushing load

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Figure 15

Views of the bow region of the aluminum high speed craft under consideration with stiffeners

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Figure 16

Smearing of stiffeners into the plate

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Figure 17

Comparison of the deformation modes for smeared model and complete model under axial crushing load

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Figure 18

Comparison of inside views of the deformation modes for smeared model (up) and complete model (down) under axial crushing load at the time 50 ms

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Figure 19

Comparison of the force-deformation curves for smeared and stiffened bow models under axial crushing load

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