Characterizing Static and Fatigue Interlaminar Fracture Behavior of a First Generation Graphite/Epoxy Composite

König, M.; Krüger, R.; Kußmaul, K.; Alberti, Mv; Gädke, M.

doi:10.1520/stp18270s

Cited by 25 publications

(25 citation statements)

References 11 publications

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“…For bonded isotropic solids the suggestion of straight crack path is not true for mode-2 cracks. In contrast, the inter-laminar fracture of fibred materials under mode-2 loading was confirmed experimentally (König et al, 1997). Hence the hypothesis of delamination is suitable for the suggested model when it describes an inter-laminar crack.…”

Section: Introductionmentioning

confidence: 80%

“…Delamination via one-parametric shape optimization It was observed in experiments (König et al, 1997) that the fracture of laminar along an interface would be consistent from a physical viewpoint. To describe the delamination between + and − in our model, we fix an initial crack of the length l 0 at t = 0, and we look for its quasi-static propagation l(t) ≥ l 0 with respect to the loading parameter t > 0.…”

Section: Quasi-static Version Of the Interface Crack Problemmentioning

confidence: 99%

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Interface cracks in composite orthotropic materials and their delamination via global shape optimization

Kovtunenko

2006

Optim Eng

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Based on the linear theory of elasticity a model describing two, in-plane deformation identical, homogeneous orthotropic materials coupled at an interface with the angle of 2β between their vertical planes of elastic symmetry and with a crack at the interface is studied. The model under consideration is spatial, and it does not split into independent isotropic/orthotropic in-plane and anti-plane models, which are treated here as the limit case of β = 0/± π 2 , respectively. The well-posedness of mathematical formulation of the problem is provided by variational methods. Applying a global optimization for the total potential energy with respect to one shape parameter of the crack length, a model for the quasi-static delamination is proposed and compared with the Griffith fracture criterion . Numerical experiments for the composite material with a plane interface crack of the fracture mode-1, mode-2, and mode-3 are presented and analyzed with respect to the half-angle β of coupling and length of the crack.

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Section: Introductionmentioning

confidence: 80%

Section: Quasi-static Version Of the Interface Crack Problemmentioning

confidence: 99%

Interface cracks in composite orthotropic materials and their delamination via global shape optimization

Kovtunenko

2006

Optim Eng

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“…4. We utilize the material parameters (2.1) for the specific case (5.3) described in the Appendix with the values from [26]:…”

Section: Observations For a Nonlinear Model (Continued)mentioning

confidence: 99%

Constrained optimization for interface cracks in composite materials subject to non-penetration conditions

2006

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A constrained problem for a composite material with an interface crack subject to nonpenetration conditions is considered. The response of a composite consisting of two identical homogeneous orthotropic materials is described with respect to in-plane deformation. The coupling of the materials occurs at an interface with angle between their vertical planes of elastic symmetry. The model is not split into independent in-plane and anti-plane states. Well-posedness of the problem is proved by variational methods. For numerical computations, a semi-smooth Newton method is proposed and its convergence is studied. Using the proposed algorithms, numerical experiments for an interface crack under mode-3 loading are presented and analyzed with respect to the half-angle defining the coupling.

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“…Note that this sort of failure may occur under both static and cyclic load conditions, both of which are studied by using the double cantilever beam, end notched fracture, and mixed mode bending experiments. 18 One might conclude that worse delamination might occur under cyclic loading. This particular study does not indicate whether cyclic or static loading is worse than the other.…”

Section: Figure 3 -Tip Cavitation Concepts and Materialsmentioning

confidence: 99%

Analysis, Fabrication, and Testing of a Composite Bladed Propeller for a Naval Academy Yard Patrol (YP) Craft

Wozniak¹

2005

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Public reporting burden for this collection of information is estimated to average 1 hour per response, including g the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. Send comments regarding this burden estimate or any other aspect of the collection of information, including suggestions for reducing this burden to Washington Headquarters Services, Directorate for Information Operations and Reports, 1215 Jefferson Davis Highway, Suite 1204, Arlington, VA 22202-4302, and to the Office of Management and Budget, Paperwork Reduction Project (0704-0188), Washington, DC 20503. AGENCY USE ONLY (Leave blank)2. REPORT DATE 6 May 2005 REPORT TYPE AND DATE COVERED TITLE AND SUBTITLEAnalysis, fabrication, and testing of a composite bladed propeller for a Naval Academy Yard Patrol (YP) craft AUTHOR(S) Wozniak, Christopher D. (Christopher David), 1982- FUNDING NUMBERS PERFORMING ORGANIZATION NAME(S) AND ADDRESS(ES)8. PERFORMING ORGANIZATION REPORT NUMBER SPONSORING/MONITORING AGENCY NAME(S) AND ADDRESS(ES) 10. SPONSORING/MONITORING AGENCY REPORT NUMBER US Naval Academy Annapolis, MD 21402Trident Scholar project report no. (2005) SUPPLEMENTARY NOTES 12a. DISTRIBUTION/AVAILABILITY STATEMENTThis document has been approved for public release; its distribution is UNLIMITED. 12b. DISTRIBUTION CODE ABSTRACT:The U.S. Navy, and much of the maritime industry, uses nickel-aluminum-bronze (NAB) as the primary material for propeller construction. This is done for many reasons, including its anti-biofouling characteristics, high stiffness, and low corrosion potential. However, NAB is a cathodic metal. While it experiences little corrosion itself, its presence leads to galvanic corrosion of the surrounding hull steel. The U.S. Navy, and much of the maritime industry, uses nickel-aluminum-bronze (NAB) as the primary material for propeller construction. This is done for many reasons, including its anti-biofouling characteristics, high stiffness, and low corrosion potential. However, NAB is a cathodic metal. While it experiences little corrosion itself, its presence leads to galvanic corrosion of the surrounding hull steel. The Navy has considered the feasibility of a composite bladed propeller design, but several variables need investigation. The goal of this Trident project was to design, build and test the Navy's first composite propeller. The detailed objectives of the research were to: evaluate a hub design; perform a structural design of a Yard Patrol (YP) craft composite bladed propeller; and finally, build and test a full-scale propeller using the composite materials. As the general concept used composite blades attached to a NAB hub, the first step was to develop a design for the hub-blade interaction. Afterwards, the loads were predicted using computational fluid dynamics. The pressure plot was then combined with the geometry in a finite element structural analysis program to determine fiber orientation and strengt...

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Characterizing Static and Fatigue Interlaminar Fracture Behavior of a First Generation Graphite/Epoxy Composite

Cited by 25 publications

References 11 publications

Interface cracks in composite orthotropic materials and their delamination via global shape optimization

Interface cracks in composite orthotropic materials and their delamination via global shape optimization

Constrained optimization for interface cracks in composite materials subject to non-penetration conditions

Analysis, Fabrication, and Testing of a Composite Bladed Propeller for a Naval Academy Yard Patrol (YP) Craft

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