An Investigation of Fracture and Fatigue in a Metal/Polymer Composite

Kung, Edward; Mercer, C.; Allameh, Seyed M.; Popoola, Oludele O.; Soboyejo, Winston O.

doi:10.4028/www.scientific.net/kem.197.87

Cited by 2 publications

(5 citation statements)

References 10 publications

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“…This behavior is in accordance with a previous work by Kung et al [4] regarding the predicted resistance-curve.…”

Section: Comparison Of Bridging Predictions With Experimental Resultssupporting

confidence: 93%

“…This represents the true specimen-independent fracture toughness value of the material. 4. Evidence of crack-bridging and fiber pull-out was observed on the fracture surfaces of the R-curve specimens.…”

Section: Discussionmentioning

confidence: 94%

“…where a is the constraint/triaxiality factor (typically between 1 and 3 and taken to be $1 in this study) [4,5], V f is the volume fraction of ductile phase, L is the length of the bridging ligament, r y is the uniaxial yield stress, and x is the distance from the crack-tip as detailed by Savastano et al [11]. For large-scale bridging conditions the length of the bridging zone is comparable to the overall crack size.…”

Section: Crack-bridging Under Monotonic Loadingmentioning

confidence: 99%

“…For small-scale bridging, in which the size of the bridging zone is much smaller than the crack length [4], the extent of ductile phase toughening may be expressed in terms of the maximum stress intensity factor the material can sustain before failure (fracture toughness). Under small-scale bridging (SSB) conditions (bridge length 6 0.5 mm), the fracture toughness of the composite, K c , can be expressed as the sum of the matrix fracture toughness, K m , and the toughening component due to small-scale crack bridging, DK ssb .…”

Section: Crack-bridging Under Monotonic Loadingmentioning

confidence: 99%

“…The single-edge notched bend specimens (SENB) were used in the present work. The measured resistancecurves are compared with predictions from theoretical fracture mechanics models [4][5][6]. The fatigue crack growth behavior is also elucidated with the crack/microstructure interactions that give rise to stable fatigue crack growth.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Fracture and fatigue of natural fiber-reinforced cementitious composites

Savastano

Santos

Radonjic

et al. 2009

Cement and Concrete Composites

182

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“…This behavior is in accordance with a previous work by Kung et al [4] regarding the predicted resistance-curve.…”

Section: Comparison Of Bridging Predictions With Experimental Resultssupporting

confidence: 93%

Section: Discussionmentioning

confidence: 94%

Section: Crack-bridging Under Monotonic Loadingmentioning

confidence: 99%

Section: Crack-bridging Under Monotonic Loadingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Fracture and fatigue of natural fiber-reinforced cementitious composites

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et al. 2009

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Pull-out behavior of natural fiber from earth-based matrix

Mustapha

Azeko

Annan

et al. 2016

Journal of Composite Materials

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This paper presents the results of a combined experimental and analytical study of the pull-out behavior of natural fiber (grass straw) from an earth-based matrix. A single fiber pull-out approach was used to measure interfacial properties that are significant to toughening brittle materials via fiber reinforcement. This was used to study the interfacial shear strengths of straw fiber-reinforced earth-based composites with a matrix that consists of 60 vol. % laterite, 20 vol. % clay and 20 vol. % cement. The composites that were used in the pull-out tests included composites reinforced with 0, 5, 10 and 20 vol. % of straw fibers. The toughening behavior of fiber-reinforced earth-based matrix was analyzed in terms of their interfacial shear strengths and bridging zones, immediately behind the crack tip. This approach is consistent with microscopic observations that reveal intact bridging fibers behind the crack tip, as a result of debonding of the fiber–matrix interface. Analytical models were used to study the debonding of fiber from the matrix materials, as well as the toughening due to crack-tip shielding via bridging. The results show that increasing the fiber embedment length and the fiber volume fraction (in the earth/cement matrix) increases the peak pull-out load. The debonding process was also found to be associated with a constant friction stress. The combined effects of multiple toughening mechanisms (debonding and crack bridging) are elucidated along with the implications of the results for the design of earth-based composites for potential applications in robust building materials for sustainable eco-friendly homes.

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An Investigation of Fracture and Fatigue in a Metal/Polymer Composite

Cited by 2 publications

References 10 publications

Fracture and fatigue of natural fiber-reinforced cementitious composites

Fracture and fatigue of natural fiber-reinforced cementitious composites

Pull-out behavior of natural fiber from earth-based matrix

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