Fatigue crack propagation in ARALL® LAMINATES: Measurement of the effect of crack-tip shielding from crack bridging

Ritchie, Robert O.; Yu, W.; Bucci, R. J.

doi:10.1016/0013-7944(89)90309-3

Cited by 112 publications

(47 citation statements)

References 24 publications

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“…As a result, the fibers reduce the stress intensity at the metallic crack tip by retarding further crack tip opening and fatigue crack propagation is slowed [19,20]. This phenomenon is known as fiber bridging as the fibers "bridge" the wake of the crack and can thus absorb some of the energy given up by the metal.…”

Section: Fiber Bridgingmentioning

confidence: 99%

Fatigue damage mechanisms in advanced hybrid titanium composite laminates

Rhymer

2002

International Journal of Fatigue

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Public reporting burden for this collection of information is estimated to average 1 hour per response, including 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 this 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 24.Jan.00 REPORT TYPE AND DATES COVERED THESIS TITLE AND SUBTITLE FATIGUE DAMAGE MECHANISMS OF ADVANCED HYBRID TITANIUM COMPOSITE LAMINATES AUTHOR(S)CAPT RHYMER DONALD W PERFORMING ORGANIZATION NAME(S) AND ADDRESS(ES)GEORGIA INSTITUTE OF TECHNOLOGY Comparing the number of cycles between the initial titanium ply damage and specimen failure showed a significant improvement (one order of magnitude for high cycle fatigue) in advanced HTCL due to interface strengthening. The damage progression following the initial ply damage (not performed on initial HTCL) demonstrated the effect of the strengthened PMC/titanium interface. Using acetate film replication of the specimen edges once titanium damage was evident, the advanced HTCL showed a propensity for some fibers in the adjacent PMC layers to fail at the point of titanium crack formation, suppressing delamination at the Ti/PMC interface. Following titanium ply cracking, these fibers would break and either a Mode I/Mode II (for outer ply damage) or Mode II (for inner ply damage) loading condition resulted in damage propagating longitudinally between the PMC fibers, rather then at the interface. The inspection of failure surfaces validated these findings, revealing PMC fibers to remain bonded to the majority of the titanium surfaces. SPONSORING/MONITORING AGENCY NAME(S) AND ADDRESS(ES)THETension compression fatigue (R = -0.2) was performed on both advanced and initial HTCL in this investigation and the strengthened interface was found superior in damage tolerance. Even though the fatigue lives were decreased for both HTCL constructions, the advanced HTCL endured a far greater number of cycles-to-failure following the initial titanium ply crack than initial HTCL at the same stress level due to resistance to delamination. Failure surfaces revealed a substantial amount of fibers xiv bonded to the titanium in advanced HTCL, while the initial laminate had few if any PMC fibers bonded. While overall fatigue life was not improved for either loading scenario,

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Section: Fiber Bridgingmentioning

confidence: 99%

Fatigue damage mechanisms in advanced hybrid titanium composite laminates

Rhymer

2002

International Journal of Fatigue

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“…3b). To verify whether such bridging is effective, we compared measurements of the elastic compliance (inverse stiffness) of the cracked bone to those made where we had subsequently machined out the wake of the crack; we also verified the latter measurements by showing that they were identical to the theoretical compliance for a traction-free crack of the same size 30 . Results for the anti-plane longitudinal orientation are shown in Fig.…”

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confidence: 99%

Mechanistic fracture criteria for the failure of human cortical bone

2003

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“…Fatigue crack growth in FML has been investigated by many researchers, using semi-empirical approaches [Marissen 1988], experimental methods [Ritchie et al 1989] and numerical methods [Guo and Wu 1998]. All these treatments used the concept of bridging stress to account for the reduction of stress intensity factor in FML, but it is empirically introduced.…”

Section: Discussionmentioning

confidence: 99%

A higher-order theory for crack growth in fiber-metal laminates under generalized plane-stress conditions

Zhang

Laliberté

2006

JOMMS

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Fiber-metal laminates (FML) are hybrid materials that consist of alternating layers of metal and fiber-reinforced prepreg. The classical plane-stress theory has difficulty in dealing with the fatigue fracture of such materials where the crack only grows in the metal layers, while the prepreg layers remain intact. In this paper, a new theoretical treatment is given to FML under generalized plane-stress conditions. The new theory introduces a harmonic anti-plane-stress potential p to describe the interlaminar stresses near the crack tips and the "bridging" effect of the unbroken fibers along the crack wakes. An analytical solution is derived for GLARE-3 (3/2) containing collinear cracks with length 2a 0 (the initial crack length) in the prepreg and length 2a in the aluminum layer. The effective stress intensity factor is obtained in a closed form, and the theoretical prediction is compared with the experimental behavior obtained from fatigue crack growth testing of center-notched specimens.

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Fatigue crack propagation in ARALL® LAMINATES: Measurement of the effect of crack-tip shielding from crack bridging

Cited by 112 publications

References 24 publications

Fatigue damage mechanisms in advanced hybrid titanium composite laminates

Fatigue damage mechanisms in advanced hybrid titanium composite laminates

Mechanistic fracture criteria for the failure of human cortical bone

A higher-order theory for crack growth in fiber-metal laminates under generalized plane-stress conditions

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