Influence of strain localization on deformation mechanisms and fracture of 12Cr1MoV steel with various notch shape under impact loading

2016 ◽  
Author(s):  
S. V. Panin ◽  
I. V. Vlasov ◽  
P. O. Maruschak ◽  
D. D. Moiseenko ◽  
F. Berto ◽  
...  
Keyword(s):  
Strain Localization ◽  
Impact Loading ◽  
Deformation Mechanisms

Deformation mechanisms and damage in α-alumina under hypervelocity impact loading

2008 ◽  
Vol 103 (8) ◽  
pp. 083508 ◽  
Author(s):  
Cheng Zhang ◽  
Rajiv K. Kalia ◽  
Aiichiro Nakano ◽  
Priya Vashishta ◽  
Paulo S. Branicio
Keyword(s):  
Impact Loading ◽  
Hypervelocity Impact ◽  
Deformation Mechanisms

Textural evolution and fluid-rock interaction during upper crustal, seismic deformation: Insights from the carbonate-dominated fault rock suite of the Belluno Thrust, Italian Southern Alps

2020 ◽  
Author(s):  
Renato Diamanti ◽  
Costantino Zuccari ◽  
Selina Bonini ◽  
Gianluca Vignaroli ◽  
Giulio Viola
Keyword(s):  
Structural Characterization ◽  
Strain Localization ◽  
Hanging Wall ◽  
Damage Zone ◽  
Southern Alps ◽  
Deformation Mechanisms ◽  
Pressure Solution ◽  
Time Interval ◽  
Rock Interaction ◽  
Calcite Veins

<p>A multi-scalar, multi-methodological approach has been used to characterize the deformation mechanisms and fluid-rock interaction processes within the Belluno Thrust (BT), a regional-scale thrust cutting through Mesozoic carbonates of the eastern Southern Alps of Italy. We report the first results of a systematic analysis of the deformation mechanisms that steered strain localization within the BT fault zone during seismogenic faulting. The WSW-ENE-striking BT contributed to development of the south-verging thrust-and-fold belt of the Southern Alps during the Late Oligocene – present time interval.        We studied an outstanding exposure of the BT in the greater Feltre region, where the BT juxtaposes an Early Jurassic oolitic and micritic limestone (the Calcari Grigi Group) in the hanging wall against an Upper Jurassic-Early Cretaceous pelagic and cherty limestone (the Maiolica Fm.). The BT is defined by a 2 m-thick damage zone formed at the expense of both the hanging wall and footwall blocks. Atop the damage zone is a millimetric principal slip surface (PSS) that strikes WSW-ENE and dips 40° to the NNW. Kinematic analysis confirms the top-to-the SSE transport along the BT. Several structural facies have been identified by means of detailed structural mapping and sampled from the damage zone (from within both the hanging- and the footwall blocks) and the PSS. The outcrop structural characterization has revealed a number of physically juxtaposed, yet different, structural facies: i) cohesive, weakly foliated proto- to ultracataclasite; ii) uncohesive, clay-rich gouge; iii) foliated domains with SC-C’ structures. Relatively unstrained host rock lithons are wrapped by these variably strained domains. Petrographic and microstructural analyses show evidence of pervasive pressure solution, with abundant stylolites, slickolites and foliated domains indicating an overall ductile behaviour. Calcite veins are also common in all recognised structural facies showing mutual cross-cutting relationships with the pressure-solution seams. This structural characterization has provided the basis for detailed image analysis of selected cataclastic textures to calculate fractal parameters for the particle size distribution (Ds) and morphology (Dr) of the clasts aiming at better understanding the cataclastic flow active in the BT fault rocks. Results from a range of representative samples suggest corrosive wear to be the main cataclastic process (Ds 1,41 ÷ 2,00; Dr 1,51 ÷ 1,88). Cathodoluminescence imaging revealed multiple generations of cement and permitted discriminating the first-order chemical characteristics of parental fluids and constraining the relationships between calcite veining and cementation. Two syn-tectonic cements have been identified: i) a bright-orange cement, preferentially surrounding carbonate clasts with highly irregular margins, indicative of the involvement of carbonate-reactive fluids; ii) a dull, homogeneous brown/black cement coexisting with a siliceous matrix, mantled clasts and local sigmoidal structures. The latter is at times observed as thin injections and fluidized structures.        Our preliminary results suggest that overall deformation was accommodated by creep and low-T crystal-plastic deformation possibly during inter-seismic phases as indicated by the presence of pressure-solution seams and foliated fabrics. Transient spikes of coseismic rupturing possibly promoted by multiple batches of overpressured fluids were accompanied by significant cataclasis and brittle strain localization.</p>

Influence of notch shape on deformation mechanisms and energy parameters of fracture of 12Cr1MoV steel under impact loading

2016 ◽  
Author(s):  
S. V. Panin ◽  
I. V. Vlasov ◽  
P. O. Maruschak ◽  
D. D. Moiseenko ◽  
F. Berto ◽  
...  
Keyword(s):  
Impact Loading ◽  
Deformation Mechanisms ◽  
Energy Parameters

scholarly journals Strain Localization at Constant Strain Rate and Changing Stress Conditions: Implications for Plate Boundary Processes in the Upper Mantle

Minerals ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 1351
Author(s):  
Julie Newman ◽  
Vasileios Chatzaras ◽  
Basil Tikoff ◽  
Jan R. Wijbrans ◽  
William M. Lamb ◽  
...  
Keyword(s):  
Grain Size ◽  
Strain Rate ◽  
Strain Localization ◽  
Upper Mantle ◽  
Plate Boundary ◽  
Constant Strain Rate ◽  
Shear Zones ◽  
Deformation Mechanisms ◽  
Uniform Stress ◽  
Experimental Deformation

We present results from a natural deformed shear zone in the Turon de Técouère massif of the French Pyrenees that directly addresses the processes involved in strain localization, a topic that has been investigated for the last 40 years by structural geologists. Paleopiezometry indicates that differential stresses are variable both spatially across the zone, and temporally during exhumation. We have, however, also calculated strain rate, which remains constant despite changes in stress. This result appears to be at odds with recent experimental deformation on monophase (olivine) rocks, which indicate that strain localization occurs dominantly as a result of constant stress. We hypothesize that in the Turon de Técouère massif—and many natural shear zones—strain localization occurs as a result of reactions, which decrease the grain size and promote the activation of grain size sensitive deformation mechanisms. From a tectonics perspective, this study indicates that the deformation rate in a particular plate boundary is relatively uniform. Stress, however, varies to accommodate this deformation. This viewpoint is consistent with deformation at a plate boundary, but it is not the typical way in which we interpret strain localization.

Structural Aspects of Ferrite and Austenite Co-Deformation in Duplex Stainless Steel

2013 ◽  
Vol 203-204 ◽  
pp. 28-33 ◽  
Author(s):  
Janusz Ryś ◽  
Anna Zielińska-Lipiec
Keyword(s):  
Strain Localization ◽  
Texture Evolution ◽  
Deformation Mechanisms ◽  
Microstructure Development ◽  
Two Phase ◽  
Duplex Steel ◽  
Dislocation Movement ◽  
Thermo Mechanical Treatment ◽  
Structural Aspects

The present research is a part of project dealing with structural aspects of ferrite and austenite co-deformation in duplex stainless steels. The examination concerned a development of ferrite and austenite microstructures, major deformation mechanisms operating in both phases and texture formation upon cold-rolling of a model duplex type steel. The investigations showed that the band-like morphology of two-phase structure formed upon processing together with specific starting textures obtained after a preliminary thermo-mechanical treatment exerted significant influence on texture and microstructure development in both constituent phases. Microstructure and texture evolution in examined duplex steel significantly differed from those in one-phase steels. These differences resulted first of all from the role of the phase boundaries acting as the barriers for dislocation movement and affecting the processes of strain localization at higher deformations.

Critical length scales and strain localization govern the mechanical performance of multi-layer graphene assemblies

Nanoscale ◽  
2016 ◽  
Vol 8 (12) ◽  
pp. 6456-6462 ◽  
Author(s):  
Wenjie Xia ◽  
Luis Ruiz ◽  
Nicola M. Pugno ◽  
Sinan Keten
Keyword(s):  
Strain Localization ◽  
Mechanical Performance ◽  
Critical Length ◽  
Deformation Mechanisms ◽  
Length Scales ◽  
Layer Graphene ◽  
Constitutive Response

Three critical length scales govern the deformation mechanisms and constitutive response of multi-layer graphene.

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