Advanced Fracture Mechanics

Kanninen, M. F.; Popelar, C. A.; Saunders, H.

doi:10.1115/1.3269540

Cited by 385 publications

(154 citation statements)

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“…When the specimens were prior damaged by 60% f , followed by 1d of aging, the healing efficiency was noticeable as seen from a higher strength and a higher fracture energy that is the area covered by the reloading-displacement profile as highlighted by the blue line. It has been known that the area under the constitutive curve represents the total fracture energy that is required to break the specimen [60]. Thus, the improved curve after healing demonstrated that more energy was needed to rupture the healing specimen because of the epoxy that provided a sufficiently strong bond between the exposed cracks and thus forced other new cracks to open, in order to prevent the reopening of the reattached cracks [18].…”

Section: Resultsmentioning

confidence: 99%

Self-Healing Efficiency of Cementitious Materials Containing Microcapsules Filled with Healing Adhesive: Mechanical Restoration and Healing Process Monitored by Water Absorption

Jiang

Yang

et al. 2013

PLoS ONE

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Autonomous crack healing of cementitious composite, a construction material that is susceptible to cracking, is of great significance to improve the serviceability and to prolong the longevity of concrete structures. In this study, the St-DVB microcapsules enclosing epoxy resins as the adhesive agent were embedded in cement paste to achieve self-healing capability. The self-healing efficiency was firstly assessed by mechanical restoration of the damaging specimens after being matured. The flexural and compressive configurations were both used to stimulate the localized and distributed cracks respectively. The effects of some factors, including the content of microcapsules, the curing conditions and the degree of damage on the healing efficiency were investigated. Water absorption was innovatively proposed to monitor and characterize the evolution of crack networks during the healing process. The healing cracks were observed by SEM-EDS following. The results demonstrated that the capsule-containing cement paste can achieve the various mechanical restorations depending on the curing condition and the degree of damage. But the voids generated by the surfactants compromised the strength. Though no noticeable improved stiffness obtained, the increasing fracture energy was seen particularly for the specimen acquiring 60% pre-damage. The sorptivity and amount of water decreased with cracks healing by the adhesive, which contributed to cut off and block ingress of water. The micrographs by SEM-EDS also validated that the cracks were bridged by the hardened epoxy as the dominated elements of C and O accounted for 95% by mass in the nearby cracks.

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Section: Resultsmentioning

confidence: 99%

Self-Healing Efficiency of Cementitious Materials Containing Microcapsules Filled with Healing Adhesive: Mechanical Restoration and Healing Process Monitored by Water Absorption

Jiang

Yang

et al. 2013

PLoS ONE

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“…In its most basic form fracture mechanics can be applied to relate the maximum permissible applied loads acting upon a structural component to the size and location of a crack (either real or hypothetical) in the component (Kanninen and Popelar, 1985). Fracture mechanics can also be used to predict the rate at which a crack can approach a critical size in fatigue or by environmental influences, and can be used to determine the conditions under which a rapidly propagating crack can be arrested.…”

Section: Introductionmentioning

confidence: 99%

Degradation, Fatigue, and Failure of Resin Dental Composite Materials

2008

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The intent of this article is to review the numerous factors that affect the mechanical properties of particle or fiber filler containing, indirect dental resin composite materials. The focus will be on degradation due to aging in different media, mainly water and water and ethanol, cyclic loading, and mixed mode loading on the flexure strength and fracture toughness. Next several selected papers will be examined in detail with respect to mixed and cyclic loading and then an examination of 3D tomography using multiaxial compression specimens. The main cause of failure, for most dental resin composites, is the breakdown of the resin matrix and or the interface between the filler and the resin matrix. In clinical studies, it appears that failure in the first 5 years is a restoration issue (technique or material selection) and after that time period from secondary decay.

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“…Thus, based on fracture mechanics models, we would expect the tip zone slope to correlate with rock strength. The lack of correlation observed here could be because our lithology database is not very robust and/or because isolated faults grow with a constant FTT (Kanninen and Popelar, 1985;Dawers et al, 1993). If the latter, our observation that tip zone gradient values cluster between 0.07 and 0.1 may be indicative of a threshold gradient due to FTT.…”

Section: Tip Zone Gradient and Fault Tip Tapermentioning

confidence: 64%

A global perspective on the topographic response to fault growth

Ellis

Barnes

2015

Geosphere

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Precise factors controlling the coevolution of deformation and topography in tectonically active landscapes remain poorly understood due to complex feedbacks between numerous possible variables. Here we examine the links between fault kinematics, emergent topography, and environmental factors on a global data set of active fault-driven mountain ranges (n = 41). Using simple regressions between tectonic, climatic, and topographic variables, we explore the controls on faultdriven landscape development at the range scale. For each fault in our Google Earth accessible database, we compiled (1) topographic metrics from a 30-m digital elevation model including along-strike changes in elevation and relief, fault length, and tip zone length (the along-strike distance from fault tip to where the associated relief stops increasing) and gradient; (2) long-term (10 4-6 yr) tectonic variables including fault slip rate, displacement rate, displacement, and age; (3) climatic variables including annual precipitation; and (4) rock type from geologic maps. Our results show that all mountain ranges reach a uniform value of relief within some distance from their tips and the length scale of this relief growth correlates with long-term vertical displacement rate (R = 0.55) and slip rate (R = 0.51). We apply a well-established framework for fault growth as the tectonic boundary condition to estimate the time required to achieve this uniform relief (~10 4-6 yr) and suggest that this threshold time indicates regional tectonomorphic equilibrium. Strong correlations between annual precipitation and deformation rates (R > 0.60), and between lithologic strength and mountain relief (R > 0.70), allude to other principal forces affecting emergent landscape form that are often ignored. Our findings demonstrate that fault-driven topography always saturates in relief, suggest there are quantifiable fault-kinematic controls on landscape form, and hint that landscape relief patterns may, in turn, be used to estimate rates of faulting.

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Advanced Fracture Mechanics

Cited by 385 publications

References 0 publications

Self-Healing Efficiency of Cementitious Materials Containing Microcapsules Filled with Healing Adhesive: Mechanical Restoration and Healing Process Monitored by Water Absorption

Self-Healing Efficiency of Cementitious Materials Containing Microcapsules Filled with Healing Adhesive: Mechanical Restoration and Healing Process Monitored by Water Absorption

Degradation, Fatigue, and Failure of Resin Dental Composite Materials

A global perspective on the topographic response to fault growth

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