Research Papers: Materials Technology

Experimental Residual Stress and Geometric Imperfections on Pressure Hull Instability Analysis

[+] Author and Article Information
Paulo Rogério Franquetto

Energetic and Nuclear Research Institute,
Avenue Professor Lineu Prestes, 2242,
São Paulo, SP 05508-000, Brazil
e-mail: franquetto@usp.br

Miguel Mattar Neto

Energetic and Nuclear Research Institute,
Avenue Professor Lineu Prestes, 2242,
São Paulo, SP 05508-000, Brazil
e-mail: mmattar@usp.br

Contributed by the Ocean, Offshore, and Arctic Engineering Division of ASME for publication in the JOURNAL OF OFFSHORE MECHANICS AND ARCTIC ENGINEERING. Manuscript received February 6, 2017; final manuscript received November 7, 2017; published online January 2, 2018. Assoc. Editor: Hagbart S. Alsos.

J. Offshore Mech. Arct. Eng 140(3), 031401 (Jan 02, 2018) (9 pages) Paper No: OMAE-17-1019; doi: 10.1115/1.4038582 History: Received February 06, 2017; Revised November 07, 2017

Residual stress produced by cold bending and welding processes contributes to the collapse pressure reduction of submarine hulls. Usually, the residual stress profiles used to quantify this reduction are obtained from analytical or numerical models. However, such models have limitations to take into account cold bending and welding in the same time. Hence, experimental analyses are necessary to better quantify the residual stress. Based on that, this paper presents residual stress experimental results obtained at six points on a pressure hull prototype using X-ray portable system. Based on these results, the residual stress profiles through the material thickness were estimated for each region on the frame by using a polynomial approximation. These profiles were introduced in a nonlinear finite element numerical model to study the collapse pressure reduction. Experimental results available on the literature were also used. Material and geometric nonlinearities were considered in the analysis. The results show that the residual stress reduces the collapse pressure as part of the frame web has stress level higher than the material yield. The preload introduced by the residual stress plays a less important role for the collapse pressure reduction at higher out-of-roundness and out-of-straightness defect amplitudes.

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Fig. 1

Schematic representation of the X-ray measure points on the pressure hull prototype

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Fig. 2

Representation of the pressure hull adoped geometry, dimensions in millimeters

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Fig. 3

Schematic representation of each residual stress profile application area

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Fig. 4

Residual stress profile 1 from Ref. [10]

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Fig. 5

Simplified representation of the polynomial approximation for the residual stress profile

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Fig. 6

Residual stress profile 2

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Fig. 7

Residual stress profile 3

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Fig. 8

Residual stress profile 4 (circumferential)

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Fig. 9

Residual stress profile 4 (longitudinal)

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Fig. 10

Main parameter used to estimate the residual stress distribution on the web

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Fig. 11

Residual stress profile 5 (circumferential)

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Fig. 12

Residual stress profile 6 (radial)

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Fig. 13

Boundary conditions for the instability model

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Fig. 14

Elastic interframe buckling pressure for different n2

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Fig. 15

Finite element mesh

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Fig. 16

Depth × radial displacement curves for 0.3%R out-of-roundness defect amplitude and no out-of-straightness defect

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Fig. 17

Nonlinear buckling failure mode with residual stress, displacements in millimeters

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Fig. 18

von Mises equivalent stress distribution through the frame at the middle of the pressure hull

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Fig. 19

Collapse depth for different out-of-roundness amplitude (%R). No out-of-straightness was applied.

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Fig. 20

Collapse reduction factor due to the residual stress for different out-of-roundness amplitude (%R)

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Fig. 21

Collapse depth for different out-of-straightness amplitude (%t) combined with 0.3%R out-of-roundness defect

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Fig. 22

Collapse reduction factor due to the residual stress for different out-of-straightness amplitude (%t)

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Fig. 23

Typical buckling failure mode with out-of-straightness defect, displacement in millimeters




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