Brittle-ductile transition stress of different rock types and its relationship with uniaxial compressive strength and Hoek–Brown material constant (m i ) [PDF]
Scientific Reports, 2023 Rocks deformed at low confining pressure are brittle, which means that after peak stress, the strength declines to a residual value established by sliding friction. The stress drop is the variation between peak and residual values.
Seyed Morteza Davarpanah +4 more
doaj +2 more sources
The brittle-ductile transition in active volcanoes [PDF]
Scientific Reports, 2019 AbstractContrasting deformation mechanisms precede volcanic eruptions and control precursory signals. Density increase and high uplifts consistent with magma intrusion and pressurization are in contrast with dilatant responses and reduced surface uplifts observed before eruptions.
Francesco Parisio +3 more
openaire +3 more sources
A laboratory study of hydraulic fracturing at the brittle-ductile transition [PDF]
Scientific Reports, 2021 AbstractDeveloping high-enthalpy geothermal systems requires a sufficiently permeable formation to extract energy through fluid circulation. Injection experiments above water’s critical point have shown that fluid flow can generate a network of highly conductive tensile cracks.
Francesco Parisio +7 more
openaire +4 more sources
Rheological transitions in the middle crust: insights from Cordilleran metamorphic core complexes [PDF]
Solid Earth, 2017 High-strain mylonitic rocks in Cordilleran metamorphic core complexes reflect ductile deformation in the middle crust, but in many examples it is unclear how these mylonites relate to the brittle detachments that overlie them.
F. J. Cooper, J. P. Platt, W. M. Behr
doaj +6 more sources
Aging‐Induced Ductile‐Brittle‐Ductile Transition in High‐Entropy Alloys and its Implications [PDF]
Advanced ScienceTemper embrittlement, characterized by a dramatic loss of ductility within a narrow temperature window, is ubiquitous in conventional alloys but is not reported in compositionally complex or high‐entropy alloy systems. Here, an unexpected ductile–brittle–
Qianning Dai +9 more
doaj +2 more sources
Porosity evolution at the brittle-ductile transition in the continental crust: Implications for deep hydro-geothermal circulation [PDF]
Scientific Reports, 2017 Recently, projects have been proposed to engineer deep geothermal reservoirs in the ductile crust. To examine their feasibility, we performed high-temperature (up to 1000 °C), high-pressure (130 MPa) triaxial experiments on granite (initially-intact and ...
M. Violay +3 more
doaj +2 more sources
A Study of Mechanics in Brittle–Ductile Cutting Mode Transition [PDF]
Micromachines, 2018 This paper presents an investigation of the mechanism of the brittle–ductile cutting mode transition from the perspective of the mechanics. A mechanistic model is proposed to analyze the relationship between undeformed chip thickness, deformation, and ...
Gaobo Xiao, Mingjun Ren, Suet To
doaj +4 more sources
Dislocation dynamic modelling of the brittle–ductile transition in tungsten [PDF]
Philosophical Magazine, 2009 Brittle-ductile transitions in metals, ceramics and semiconductors are closely connected with dislocation activity emanating near to crack-tips. We have simulated the evolution of crack-tip plasticity using a two dimensional dislocation dynamics model which has been developed to include two symmetric slip planes intersecting the crack-tip, and applied ...
Edmund Tarleton, S G Roberts
exaly +3 more sources
Journal of Pipeline Science and Engineering, 2023 This study investigated the impact of temperature on Fatigue Crack Growth Rates (FCGR) of low-carbon pipe steel in both the ductile and ductile-to-brittle transition regions.
Dong-Yeob Park, Jie Liang
doaj +1 more source
Constitutive Behavior of Olivine Gouge Across the Brittle‐Ductile Transition
Geophysical Research Letters, 2023 The bottom of the lithosphere is characterized by a thermally controlled transition from brittle to ductile deformation. While the mechanical behavior of rocks firmly within the brittle and ductile regimes is relatively well understood, how the ...
Sylvain Barbot, Lei Zhang
doaj +1 more source