Effects of imperfections of the buckling response of composite shells

Hilburger, Mark W.; Starnes, James H.

doi:10.1016/j.tws.2003.09.001

Cited by 60 publications

(31 citation statements)

References 9 publications

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“…Much of this work has been documented in Refs. [20][21][22] and selected details about the test specimens, imperfection measurements, and tests are summarized in this section. Additional details on the cylinder tests can be found in these references.…”

Section: Test Specimens Imperfection Measurements and Testsmentioning

confidence: 99%

Shell Buckling Design Criteria Based on Manufacturing Imperfection Signatures

Hilburger¹,

Nemeth²,

Starnes³

2003

44th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference

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Section: Test Specimens Imperfection Measurements and Testsmentioning

confidence: 99%

Shell Buckling Design Criteria Based on Manufacturing Imperfection Signatures

Hilburger¹,

Nemeth²,

Starnes³

2003

44th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference

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“…Genetic algorithm was tried to optimise the buckling capacity of thin underwater composite cylindrical vessels by Massager et al [4] which gave an optimum laminae stacking fibre orientation of angle which include [30 , 45 , 60 , 75 , 90 ] and compared with ±55 orientation for carbon and glass fiber with epoxy resin and the author also correlated with experimental data. Ng RKH et al [5] contributed to testing vessels under shallow external pressure using e-glass/epoxy woven composite material for a semi-autonomous underwater vehicle and compared with numerical analysis. Derek Graham [6] tested small scale submarines vessels and analysed the real scale submarines us-ing experimental data for deep sea oceans with application of polymer composite material.…”

Section: Introductionmentioning

confidence: 99%

Comparative study of Metallic and Polymer Composite Shells for Underwater Vessels Using FEA

Govindaraj¹,

Narayanarao²,

Krishna³

et al. 2013

International Journal of Ocean System Engineering

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The present research was aimed at comparing performance of metallic and polymer composite shells of a typical underwater vessel of length and inner diameter of 1650 mm and 350 mm respectively, based on the critical buckling pressure for operating depth of 1000 m using ANSYS. High strength steel, aluminium alloy, titanium alloy, glass / epoxy and carbon / epoxy materials were examined. The results indicated weight savings of 46 % in carbon/epoxy and 31 % in glass / epoxy when compared with high strength steel, based on the thickness of the shell for sustaining 10 MPa buckling pressure.

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“…Studies on composite shells [12][13][14][15] have proved that traditional (geometric tube -wall mid-surface imperfections) and non-traditional imperfections (tube wall thickness variation, local tube wall ply gaps, tube end geometric imperfections, non-uniform loading of tubes and variations in the boundary condition) have a large influence on the performance of composite shell structures. Non-traditional imperfections such as variation in the boundary condition and loading can be avoided with proper care during experimental testing.…”

Section: Introductionmentioning

confidence: 99%

“…Hence, during an analytical study or a finite element calculation it is advisable to consider the above effects to predict the correct performance parameters of a composite structure. Of the mentioned initial imperfections, the influence of initial geometric imperfections on the performance of a composite structure is greatest [12,16,17]. As discussed in Part I, the numerical impact studies on square tubes with tulip triggering (SP2) yielded an unrealistic initial peak load.…”

Section: Introductionmentioning

confidence: 99%

Parametric study of crushing parameters and failure patterns of pultruded composite tubes using cohesive elements and seam: Part II – Multiple delaminations and initial geometric imperfections

et al. 2010

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Part I presented the circumferential central delamination and triggering modelling of composite tubes and their influence on predicting the peak crush load and the corresponding energy absorption. The knowledge of failure pattern is very important for the design architecture of an energy absorbing element and its placement in the structure. In this study, the failure patterns of pultruded circular and square cross sectional glass polyester composite tubes were evaluated with pre-defined seams for an axial impact loading case. Furthermore, this paper demonstrates the importance of considering multiple delaminations to predict the appropriate energy absorption of composite tubes using cohesive elements. The influence of correct numerical modelling of triggering (especially 45° edge chamfering) on the peak crush load of the composite tubes is proved with multiple layers of shell elements. The effect of initial geometric imperfections on the energy absorption, peak crushing load and the deformation pattern of pultruded glass polyester composite tubes is also studied. In order to address the importance of above factors, a comprehensive numerical investigation was carried out with multiple layers of shell elements and with cohesive elements. Finally, the deformation patterns, peak crushing load and the corresponding energy absorption were compared with experimental results [1].

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Effects of imperfections of the buckling response of composite shells

Cited by 60 publications

References 9 publications

Shell Buckling Design Criteria Based on Manufacturing Imperfection Signatures

Shell Buckling Design Criteria Based on Manufacturing Imperfection Signatures

Comparative study of Metallic and Polymer Composite Shells for Underwater Vessels Using FEA

Parametric study of crushing parameters and failure patterns of pultruded composite tubes using cohesive elements and seam: Part II – Multiple delaminations and initial geometric imperfections

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