Design of X-joints in Sandwich Structures for Naval Vessels

Brian Hayman (Invited author), Christian Berggreen (Invited author), Christian Lundsgaard-Larsen (Invited author), Claus Jenstrup (Invited author), Kasper Karlsen (Invited author)

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review

Abstract

In many naval ships of fibre composite sandwich construction, an X-joint exists where the end bulkhead of the superstructure is attached to the deck, with an internal bulkhead placed in the same vertical plane below the deck. This joint is subjected to alternating tensile and compressive loading in the vertical direction for respectively hogging and sagging bending deformation of the hull girder. When the core material is polymer foam, such joints are often strengthened by the insertion of a higher density core material in the deck panel in the immediate region of the joint. The paper aims to improve the basis for the design of such X-joints, focusing on the prevention of crushing of the core under compressive load while ensuring adequate damage tolerance for the case of tensile load. Extensive material tests are reported, strain distributions are investigated by both laboratory tests and numerical modelling, and design guidance for core inserts is presented.
Original languageEnglish
Title of host publication10th International Symposium of Practical Design of Ships and Other Floating Structures
EditorsRoger I. Basu, Vadim Belenky, Ge (George) Wang, Qing Yu
Number of pages1366
VolumeVolume 2
Place of PublicationHarleysville, Pensylvania, USA
PublisherAlcom Printing Group
Publication date2007
Pages1086-1095
ISBN (Print)0-943870-05-4
Publication statusPublished - 2007
Event10th International Symposium on Practical Design of Ships and Other Floating Structures - Houston, TX, United States
Duration: 1 Oct 20075 Oct 2007
Conference number: 10

Conference

Conference10th International Symposium on Practical Design of Ships and Other Floating Structures
Number10
CountryUnited States
CityHouston, TX
Period01/10/200705/10/2007

Keywords

  • Sandwich
  • X-joint
  • core inserts
  • fibre bridging
  • debond

Cite this

Hayman, B., Berggreen, C., Lundsgaard-Larsen, C., Jenstrup, C., & Karlsen, K. (2007). Design of X-joints in Sandwich Structures for Naval Vessels. In R. I. Basu, V. Belenky, G. G. Wang, & Q. Yu (Eds.), 10th International Symposium of Practical Design of Ships and Other Floating Structures (Vol. Volume 2, pp. 1086-1095). Harleysville, Pensylvania, USA: Alcom Printing Group.
Hayman, Brian ; Berggreen, Christian ; Lundsgaard-Larsen, Christian ; Jenstrup, Claus ; Karlsen, Kasper. / Design of X-joints in Sandwich Structures for Naval Vessels. 10th International Symposium of Practical Design of Ships and Other Floating Structures. editor / Roger I. Basu ; Vadim Belenky ; Ge (George) Wang ; Qing Yu. Vol. Volume 2 Harleysville, Pensylvania, USA : Alcom Printing Group, 2007. pp. 1086-1095
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title = "Design of X-joints in Sandwich Structures for Naval Vessels",
abstract = "In many naval ships of fibre composite sandwich construction, an X-joint exists where the end bulkhead of the superstructure is attached to the deck, with an internal bulkhead placed in the same vertical plane below the deck. This joint is subjected to alternating tensile and compressive loading in the vertical direction for respectively hogging and sagging bending deformation of the hull girder. When the core material is polymer foam, such joints are often strengthened by the insertion of a higher density core material in the deck panel in the immediate region of the joint. The paper aims to improve the basis for the design of such X-joints, focusing on the prevention of crushing of the core under compressive load while ensuring adequate damage tolerance for the case of tensile load. Extensive material tests are reported, strain distributions are investigated by both laboratory tests and numerical modelling, and design guidance for core inserts is presented.",
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Hayman, B, Berggreen, C, Lundsgaard-Larsen, C, Jenstrup, C & Karlsen, K 2007, Design of X-joints in Sandwich Structures for Naval Vessels. in RI Basu, V Belenky, GG Wang & Q Yu (eds), 10th International Symposium of Practical Design of Ships and Other Floating Structures. vol. Volume 2, Alcom Printing Group, Harleysville, Pensylvania, USA, pp. 1086-1095, 10th International Symposium on Practical Design of Ships and Other Floating Structures, Houston, TX, United States, 01/10/2007.

Design of X-joints in Sandwich Structures for Naval Vessels. / Hayman, Brian (Invited author); Berggreen, Christian (Invited author); Lundsgaard-Larsen, Christian (Invited author); Jenstrup, Claus (Invited author); Karlsen, Kasper (Invited author).

10th International Symposium of Practical Design of Ships and Other Floating Structures. ed. / Roger I. Basu; Vadim Belenky; Ge (George) Wang; Qing Yu. Vol. Volume 2 Harleysville, Pensylvania, USA : Alcom Printing Group, 2007. p. 1086-1095.

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review

TY - GEN

T1 - Design of X-joints in Sandwich Structures for Naval Vessels

AU - Hayman, Brian

AU - Berggreen, Christian

AU - Lundsgaard-Larsen, Christian

AU - Jenstrup, Claus

AU - Karlsen, Kasper

PY - 2007

Y1 - 2007

N2 - In many naval ships of fibre composite sandwich construction, an X-joint exists where the end bulkhead of the superstructure is attached to the deck, with an internal bulkhead placed in the same vertical plane below the deck. This joint is subjected to alternating tensile and compressive loading in the vertical direction for respectively hogging and sagging bending deformation of the hull girder. When the core material is polymer foam, such joints are often strengthened by the insertion of a higher density core material in the deck panel in the immediate region of the joint. The paper aims to improve the basis for the design of such X-joints, focusing on the prevention of crushing of the core under compressive load while ensuring adequate damage tolerance for the case of tensile load. Extensive material tests are reported, strain distributions are investigated by both laboratory tests and numerical modelling, and design guidance for core inserts is presented.

AB - In many naval ships of fibre composite sandwich construction, an X-joint exists where the end bulkhead of the superstructure is attached to the deck, with an internal bulkhead placed in the same vertical plane below the deck. This joint is subjected to alternating tensile and compressive loading in the vertical direction for respectively hogging and sagging bending deformation of the hull girder. When the core material is polymer foam, such joints are often strengthened by the insertion of a higher density core material in the deck panel in the immediate region of the joint. The paper aims to improve the basis for the design of such X-joints, focusing on the prevention of crushing of the core under compressive load while ensuring adequate damage tolerance for the case of tensile load. Extensive material tests are reported, strain distributions are investigated by both laboratory tests and numerical modelling, and design guidance for core inserts is presented.

KW - Sandwich

KW - X-joint

KW - core inserts

KW - fibre bridging

KW - debond

M3 - Article in proceedings

SN - 0-943870-05-4

VL - Volume 2

SP - 1086

EP - 1095

BT - 10th International Symposium of Practical Design of Ships and Other Floating Structures

A2 - Basu, Roger I.

A2 - Belenky, Vadim

A2 - Wang, Ge (George)

A2 - Yu, Qing

PB - Alcom Printing Group

CY - Harleysville, Pensylvania, USA

ER -

Hayman B, Berggreen C, Lundsgaard-Larsen C, Jenstrup C, Karlsen K. Design of X-joints in Sandwich Structures for Naval Vessels. In Basu RI, Belenky V, Wang GG, Yu Q, editors, 10th International Symposium of Practical Design of Ships and Other Floating Structures. Vol. Volume 2. Harleysville, Pensylvania, USA: Alcom Printing Group. 2007. p. 1086-1095