Fracture and Strain Field Evolution in Faulted Brine-Saturated Sandstone

2018 ◽  
Vol 48 (2) ◽  
pp. 20170524 ◽  
Author(s):  
Yan-Hua Huang ◽  
Sheng-Qi Yang ◽  
Matthew R. Hall
Keyword(s):  
Strain Field ◽  
Field Evolution

Roughening and strain-field evolution at a grain boundary in α−Al2O3

2018 ◽  
Vol 2 (11) ◽  
Author(s):  
Sung Bo Lee ◽  
Seung-Yong Lee ◽  
Seung Jo Yoo ◽  
Yoonkoo Kim ◽  
Jin-Gyu Kim ◽  
...  
Keyword(s):  
Grain Boundary ◽  
Strain Field ◽  
Field Evolution ◽  
Α Al2o3

scholarly journals Strain field evolution at the ductile-to-brittle transition: a case study on ice

Solid Earth ◽  
2017 ◽  
Vol 8 (5) ◽  
pp. 943-953 ◽  
Author(s):  
Thomas Chauve ◽  
Maurine Montagnat ◽  
Cedric Lachaud ◽  
David Georges ◽  
Pierre Vacher
Keyword(s):  
Stress Concentration ◽  
Dynamic Recrystallization ◽  
Strain Field ◽  
Crack Opening ◽  
Local Stress ◽  
Image Correlation ◽  
Brittle Transition ◽  
Field Evolution ◽  
Crack Tips ◽  
Ductile To Brittle Transition

Abstract. This paper presents, for the first time, the evolution of the local heterogeneous strain field around intra-granular cracking in polycrystalline ice, at the onset of tertiary creep. Owing to the high homologous temperature conditions and relatively low compressive stress applied, stress concentration at the crack tips is relaxed by plastic mechanisms associated with dynamic recrystallization. Strain field evolution followed by digital image correlation (DIC) directly shows the redistribution of strain during crack opening, but also the redistribution driven by crack tip plasticity mechanisms and recrystallization. Associated local changes in microstructure induce modifications of the local stress field evidenced by crack closure during deformation. At the ductile-to-brittle transition in ice, micro-cracking and dynamic recrystallization mechanisms can co-exist and interact, the later being efficient to relax stress concentration at the crack tips.

scholarly journals Direct measurement of strain field evolution during dynamic deformation of an energetic material

1998 ◽  
Author(s):  
B. W. Asay ◽  
B. F. Henson ◽  
P. M. Dickson ◽  
C. S. Fugard ◽  
D. J. Funk
Keyword(s):  
Direct Measurement ◽  
Strain Field ◽  
Dynamic Deformation ◽  
Energetic Material ◽  
Field Evolution

Strain field evolution on the surface of aluminum sheet alloys exposed to specific impact with oscillation loading

2014 ◽  
Vol 50 (1) ◽  
pp. 61-72 ◽  
Author(s):  
Mykola G Chausov ◽  
Valentyn B Berezin ◽  
Andrii P Pylypenko ◽  
Volodymyr B Hutsaylyuk
Keyword(s):  
Strain Field ◽  
Aluminum Sheet ◽  
Field Evolution ◽  
Specific Impact

scholarly journals Experimental Study of Strain Field Evolution During Milling Process

Procedia CIRP ◽  
2017 ◽  
Vol 58 ◽  
pp. 128-133
Author(s):  
Dong Zhang ◽  
Xiao-Ming Zhang ◽  
Ding Chen ◽  
Jürgen Leopold ◽  
Han Ding
Keyword(s):  
Experimental Study ◽  
Strain Field ◽  
Milling Process ◽  
Field Evolution

scholarly journals 3D Strain Field Evolution and Failure Mechanisms in Anisotropic Paperboard

2021 ◽  
Author(s):  
S. Johansson ◽  
J. Engqvist ◽  
J. Tryding ◽  
S. A. Hall
Keyword(s):  
Plane Strain ◽  
Strain Field ◽  
Failure Mechanisms ◽  
Strain Tensor ◽  
Peak Load ◽  
Sample Thickness ◽  
Deformation And Failure ◽  
Field Patterns ◽  
Field Evolution ◽  
Out Of Plane

Abstract Background Experimental analyses of the 3D strain field evolution during loading allows for better understanding of deformation and failure mechanisms at the meso- and microscale in different materials. In order to understand the auxetic behaviour and delamination process in paperboard materials during tensile deformation, it is essential to study the out-of-plane component of the strain tensor that is, in contrast to previous 2D studies, only achievable in 3D. Objective The main objective of this study is to obtain a better understanding of the influence of different out-of-plane structures and in-plane material directions on the deformation and failure mechanisms at the meso- and microscale in paperboard samples. Methods X-ray tomography imaging during in-situ uniaxial tensile testing and Digital Volume Correlation analysis was performed to investigate the 3D strain field evolution and microscale mechanical behaviour in two different types of commercial paperboards and in two material directions. The evolution of sample properties such as the spatial variation in sample thickness, solid fraction and fibre orientation distribution were also obtained from the images. A comprehensive analysis of the full strain tensor in paperboards is lacking in previous research, and the influence of material directions and out-of-plane structures on 3D strain field patterns as well as the spatial and temporal quantification of the auxetic behaviour in paperboard are novel contributions. Results The results show that volumetric and deviatoric strain, dominated by the out-of-plane normal strain component of the strain tensor, localize in the out-of-plane centre already in the initial linear stress-strain regime. In-plane strain field patterns differ between samples loaded in the Machine Direction (MD) and Cross Direction (CD); in MD, strain localizes in a more well-defined zone close to the notches and the failure occurs abruptly at peak load, resulting in angular fracture paths extending through the stiffer surface planes of the samples. In CD, strain localizes in more horizontal and continuous bands between the notches and at peak load, fractures are not clearly visible at the surfaces of CD-tested samples that appear to fail internally through more well-distributed delamination. Conclusions In-plane strain localization preceded a local increase of sample thickness, i.e. the initiation of the delamination process, and at peak load, a dramatic increase in average sample thickening occurred. Different in-plane material directions affected the angles and continuity of the in-plane strain patterns as well as the sample and fracture properties at failure, while the out-of-plane structure affected how the strain fields distributed within the samples.

Strain field evolution of 2D needled C/SiC composites under tension

2017 ◽  
Vol 37 (2) ◽  
pp. 531-537 ◽  
Author(s):  
Guoqiang Yu ◽  
Xiguang Gao ◽  
Guangwu Fang ◽  
Jiangang Xue ◽  
Yingdong Song
Keyword(s):  
Strain Field ◽  
Field Evolution ◽  
Sic Composites

scholarly journals Strain Field Evolution Characteristics of Free Surface during Crater Blasting in Sandstone under High Stress

2020 ◽  
Vol 10 (18) ◽  
pp. 6285 ◽  
Author(s):  
Fengpeng Zhang ◽  
Guangliang Yan ◽  
Qibo Yang ◽  
Jikai Gao ◽  
Yuanhui Li
Keyword(s):  
Free Surface ◽  
Static Loading ◽  
Strain Field ◽  
Tensile Strain ◽  
High Stress ◽  
Principal Strain ◽  
Rock Blasting ◽  
Tensile Cracks ◽  
Field Evolution ◽  
Maximum Principal Strain

Considering the problems related to hard rock blasting under high in-situ stresses at large depths, we conducted crater blasting tests on sandstone specimens under three static load conditions to investigate the strain field evolution of rock blasting under high stress. The digital image correlation (DIC) technique was used to monitor the evolution of the strain field on the free surface. Thus, the influence of the static stress on the blasting strain field was analyzed, and the formation mechanism of cracks on the free surface was elucidated. The results indicate that a circular tensile strain zone was formed without static loading. The direction of the maximum principal strain was perpendicular to the radius, which lead to the random emergence of multiple radial tensile cracks. Under a uniaxial static loading, an elliptical tensile strain zone was formed. The direction of the maximum principal strain was perpendicular to the static loading direction. This facilitated the initiation and propagation of tensile cracks preferentially in the direction parallel to the static loading. Under an equal biaxial static loading, the initial compressive strain in the specimen reduced the increment rate of the blasting strain, and restrained the formation of surface cracks. Besides, a determination method for dynamic tensile fracture strain of rock was proposed.

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