Toughening of thin ceramic plates using bioinspired surface patterns

Malik, Idris A.; Barthelat, François

doi:10.1016/j.ijsolstr.2016.07.010

Cited by 39 publications

(17 citation statements)

References 33 publications

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“…Hopefully, our predictions will provide the motivation to control particle distributions (or, more generally, defect distributions) in metallic alloys to engineer the crack path in order to increase its ductile fracture resistance. In this regard, it is worth noting that Malik and Barthelat (2016) showed experimentally that engineering the crack path along a sinusoidal weak interface in thin sheets of brittle aluminum oxide can increase its fracture toughness under mode I dominant loading. Furthermore, several highly mineralized natural materials contain well architectured defect distributions that can engineer the crack path.…”

Section: Discussionmentioning

confidence: 99%

“…The calculations are carried out for small scale yielding conditions with monotonically increasing imposed remote displacements corresponding to mode I loading. We note that crack propagation along a continuous weak interface that follows a sinusoidal or wavy profile between two materials under dominant mode I loading has been studied, both computationally (Zavattieri et al, 2007(Zavattieri et al, , 2008Cordisco et al, 2012Cordisco et al, , 2014 and experimentally (Mirkhalaf et al, 2014;Malik and Barthelat, 2016). These computational and experimental studies have shown that, in the circumstances considered, crack deflection along controlled wavy interfaces can improve crack growth resistance.…”

Section: Introductionmentioning

confidence: 91%

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Engineering the crack path by controlling the microstructure

Srivastava

Osovski

Needleman

2017

Journal of the Mechanics and Physics of Solids

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We explore the possibility of engineering the crack path by controlling a material's microstructure in order to increase its crack growth resistance. Attention is confined to a specific type of microstructure that is encountered in a variety of structural metals and alloys-second phase particles distributed in a ductile matrix. The type of controlled microstructure modeled is characterized by various sinusoidal distributions of particles with fixed mean particle spacing. Three dimensional, finite deformation small scale yielding calculations of mode I crack growth are carried out for such controlled microstructures using an elastic-viscoplastic constitutive relation for a progressively cavitating solid. The results show that appropriately engineered sinusoidal distributions of particles can give fracture toughness values 2 to 3 times greater than a random distribution of particles with the same mean particle spacing. Tearing modulus values can be increased by a factor of 1.5 to 2. The greatest crack growth resistance generally occurs when the amplitude and the wavelength of the sinusoidal distribution are increased together. When the amplitude and the wavelength of the sinusoidal distribution do not increase together the crack can jump from one crest (or trough) to the next crest (or trough) which tends to reduce the crack growth resistance. Fracture surface roughness statistics are also calculated. In contrast to the essentially universal value for random distributions of particles, the value of the computed Hurst exponent is found to depend on the amplitude and the wavelength of the sinusoidal profile. A correlation is found between the computed fracture toughness values and values of characteristic length scales of the fracture surface roughness.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 91%

Engineering the crack path by controlling the microstructure

Srivastava

Osovski

Needleman

2017

Journal of the Mechanics and Physics of Solids

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“…Since transparency is not affected, there are a variety of engineering applications for this laser etched glass composite, including use in car windshields to localize damage. Laser etching has also been used to create trenches in aluminum oxide plates to channel cracks to certain paths, a phenomenon seen in many biological materials such as bone, teeth, and mollusk shells . These bioinspired designs increase toughness by guiding and localizing damage in the material.…”

Section: Bioinspired Designs At Different Length‐scalesmentioning

confidence: 99%

Multiscale Toughening Mechanisms in Biological Materials and Bioinspired Designs

et al. 2019

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Biological materials found in Nature such as nacre and bone are well recognized as light-weight, strong, and tough structural materials. The remarkable toughness and damage tolerance of such biological materials are conferred through hierarchical assembly of their multiscale (i.e., atomicto macroscale) architectures and components. Herein, the toughening mechanisms of different organisms at multilength scales are identified and summarized: macromolecular deformation, chemical bond breakage, and biomineral crystal imperfections at the atomic scale; biopolymer fibril reconfiguration/deformation and biomineral nanoparticle/nanoplatelet/ nanorod translation, and crack reorientation at the nanoscale; crack deflection and twisting by characteristic features such as tubules and lamellae at the microscale; and structure and morphology optimization at the macroscale. In addition, the actual loading conditions of the natural organisms are different, leading to energy dissipation occurring at different time scales. These toughening mechanisms are further illustrated by comparing the experimental results with computational modeling. Modeling methods at different length and time scales are reviewed. Examples of biomimetic designs that realize the multiscale toughening mechanisms in engineering materials are introduced. Indeed, there is still plenty of room mimicking the strong and tough biological designs at the multilength and time scale in Nature.

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“…This new approach enables reinforcement and toughening of materials at specific structural loci, which are more prone to failure, without altering the composition of the entire structure or adding more phases. Composites design by magnetic fields has the potential to enable intricate design of properties on the microscale that may be further applied to unique structures, such as composites with spatially varying stiffness [43], with arrays of defects [44,45] and graded interfaces [46].…”

Section: Discussionmentioning

confidence: 99%

Efficient Toughening of Short-Fiber Composites Using Weak Magnetic Fields

2020

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Short fibers may serve as toughening agents of composite materials because of the high energy dissipated during fracture, associated with numerous fiber pullouts. An ongoing challenge is to improve their toughness even further, by directing and concentrating fibers near highly stressed structural regions. Weak magnetic fields are utilized to increase the fracture toughness of an epoxy matrix reinforced by short magnetized glass fibers by directing and concentrating fibers near highly stressed structural regions. The orientation and local concentration of the fibers are controlled by the vector components of the magnetic field, and by the gradient in field intensity, respectively. Optimized fracture toughness was achieved by using two pairs of permanent magnets, combining enhanced concentration of fibers in the crack-tip vicinity with alignment of the fibers along the load direction. This optimized value was well above the reference fracture-toughness measured for composites with the same filler content in the absence of a magnetic field, as well as above the value achieved by exploiting unidirectional alignment, without fiber translation, using a solenoid. The method suggested in this study—localized reinforcement using magnetic translation of fillers through the formation of magnetic gradients—enables efficient and controllable improvement in the composite’s overall resistance to fracture, without the involvement of additional phases or material.

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Toughening of thin ceramic plates using bioinspired surface patterns

Cited by 39 publications

References 33 publications

Engineering the crack path by controlling the microstructure

Engineering the crack path by controlling the microstructure

Multiscale Toughening Mechanisms in Biological Materials and Bioinspired Designs

Efficient Toughening of Short-Fiber Composites Using Weak Magnetic Fields

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