Robert O. Ritchie
University of California, Berkeley
Crack growth resistance curveUltimate tensile strengthCeramicBrittlenessComposite materialMetallurgyMaterials scienceAlloyCortical boneFracture (geology)Fracture mechanicsCyclic stressStructural engineeringParis' lawCrack closureForensic engineeringMicrostructureStress (mechanics)Fracture toughnessToughness
Publications 681
#1Yuan Zhang (Center for Advanced Materials)H-Index: 1
#2Guoqi Tan (Center for Advanced Materials)H-Index: 2
Last. Longchao ZhuoH-Index: 15
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Abstract null null The microscopic Bouligand-type architectures of fish scales demonstrate a notable efficiency in enhancing the damage tolerance of materials; nevertheless, it is challenging to reproduce in metals. Here bioinspired tungsten-copper composites with different Bouligand-type architectures mimicking fish scales were fabricated by infiltrating a copper melt into woven contextures of tungsten fibers. These composites exhibit a synergetic enhancement in both strength and ductility at r...
1 CitationsSource
#1J. Paul Forna-Kreutzer (UoB: University of Bristol)
#2Jon Ell (University of California, Berkeley)H-Index: 4
Last. Dong Liu (UoB: University of Bristol)H-Index: 13
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Abstract null null In situ synchrotron X-ray computed micro-tomography and digital volume correlation (DVC) were utilised to understand the failure mechanisms at room temperature and 1050 °C of two NextelTM720/alumina oxide-oxide ceramic-matrix composites (CMCs), termed materials A and B, sintered respectively at 1200 °C and ∼1250 °C. At both test temperatures, three-point-bending strengths were ∼55-58 MPa for material A and ∼94-100 MPa for material B. Damage was associated with three primary ty...
#1Weihua Guo (Beihang University)H-Index: 2
#2Yao Huang (Beihang University)H-Index: 2
Last. Sha Yin (Beihang University)H-Index: 20
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Abstract null null Dual-phase mechanical metamaterials, fabricated as a hybrid of two architected lattice materials with different mechanical properties and bioinspired patterning, have been shown to exhibit improved combination of properties, such as enhanced reinforced strength and toughness. In this study, we specifically examine the selection of the reinforcement phase, specifically involving the effects of its structural architecture, in terms of connectivity and interfacial structure, on t...
#1Sheng Yin (LBNL: Lawrence Berkeley National Laboratory)H-Index: 8
#2Yunxing Zuo (UCSD: University of California, San Diego)H-Index: 9
Last. Robert O. Ritchie (LBNL: Lawrence Berkeley National Laboratory)H-Index: 132
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Refractory high-entropy alloys (RHEAs) are designed for high elevated-temperature strength, with both edge and screw dislocations playing an important role for plastic deformation. However, they can also display a significant energetic driving force for chemical short-range ordering (SRO). Here, we investigate mechanisms underlying the mobilities of screw and edge dislocations in the body-centered cubic MoNbTaW RHEA over a wide temperature range using extensive molecular dynamics simulations bas...
#1Robert O. Ritchie (LBNL: Lawrence Berkeley National Laboratory)H-Index: 132
It has been said that God invented plasticity, but the Devil invented fracture! Both mechanisms represent the two prime modes of structural failure, respectively, plastic collapse and the rupture/b...
1 CitationsSource
#1Yang Yang (UC: University of California)
#2Ruopeng ZhangH-Index: 8
Last. Mark Asta (UC: University of California)H-Index: 83
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#1Yang Yang (LBNL: Lawrence Berkeley National Laboratory)
#2Weiyue Zhou (MIT: Massachusetts Institute of Technology)H-Index: 5
Last. Andrew M. Minor (UC: University of California)H-Index: 64
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#1Tian Wenhan (Beihang University)
#2Kang Yang (Beihang University)H-Index: 6
Last. Robert O. Ritchie (University of California, Berkeley)H-Index: 132
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Abstract Silk fibres exhibit good biodegradability, biocompatibility and balanced strength and toughness, which are useful for toughness/impact-critical composites in the biomedical field. However, the impact of hydration has not been studied for silk fibre-reinforced polymers (SFRPs). In this work, SFRPs fabricated vacuum-assisted resin infusion (VARI) were treated under three hydration conditions. A hydration condition of 40 °C at 89% relative humidity (RH) was sufficient to induce a reduction...
#1Yanyan Liu (USTC: University of Science and Technology of China)
#2Qin Yu (University of California, Berkeley)H-Index: 22
Last. Robert O. Ritchie (University of California, Berkeley)H-Index: 132
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Abstract null null Natural fish scales demonstrate outstanding mechanical efficiency owing to their elaborate architectures and thereby may serve as ideal prototypes for the architectural design of man-made materials. Here bioinspired magnesium composites with fish-scale-like orthogonal plywood and double-Bouligand architectures were developed by pressureless infiltration of a magnesium melt into the woven contextures of continuous titanium fibers. The composites exhibit enhanced strength and wo...
#1Talha J. Pirzada (University of Oxford)H-Index: 3
#2Dong Liu (UoB: University of Bristol)H-Index: 13
Last. Robert O. Ritchie (University of California, Berkeley)H-Index: 132
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Abstract The deformation and fracture of a 0/90 °Nextel 720 alumina/Mullite fibre / alumina matrix ceramic-matrix composite material has been observed by in situ synchrotron x-ray computed micro-tomography at ambient temperature and at 1100 °C. A three-point loading configuration was used and samples were loaded monotonically until final fracture. The flexural strength was found to be unaffected by temperature. 3D visualisation of the microstructure showed fracture occurred by propagation of int...
4 CitationsSource