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strain field investigation of limestone specimen under uniaxial compression loads using particle image velocimetry

Journal of Central South University 2011年第5期18卷 1619-1625页

作者：徐金明程昌宏陆海平 Department of Civil Engineering Shanghai University Hunan Zhongda Design Institute Company Limited Central South University

The particle image velocimetry (PIV) method was used to investigate the full-field displacements and strains of the limestone specimen under external loads from the video images captured during the laboratory *** original colorful video images and experimental data were obtained from the uniaxial compression test of a *** eliminate perspective errors and lens distortion,the camera was placed normal to the rock specimen *** converted into a readable format of frame images,these videos were transformed into the responding grayscale images,and the frame images were then *** full-field displacement field was obtained by using the PIV technique,and interpolated in the sub-pixel *** displacement was measured in the plane of the image and inferred from two consecutive *** local displacement vectors were calculated for small sub-windows of the images by means of *** video images were interrogated in a multi-pass way,starting off with 64×64 images,ending with 16×16 images after 6 iterations,and using 75% overlap of the *** order to remove spurious vectors,the displacements were filtered using four filters:signal-to-noise ratio filter,peak height filter,global filter and local *** cubic interpolation was utilized if the displacements without a number were *** full-field strain was then obtained using the local least square method from the discrete *** strain change with time at different locations was also *** is found that the normal strains are dependant on the locations and the crack *** 1.0 and 5.0 s prior to the specimen failure,normal strains increase rapidly at many locations,while a stable status appears at some *** the specimen is in a failure status,a large rotation occurs and it increases in the inverse *** strain concentration bands do not completely develop into the large cracks,and meso-cracks are n

关键词： rock materials limestone video image strain field uniaxial compression particle image velocimetry

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3D Morphing Using strain field Interpolation

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Journal of Computer Science & Technology 2007年第1期22卷 147-155页

作者：严寒冰胡事民 Ralph R Martin National Computer Network Emergency Response Technical Team/Coordination Center of China Beijing 100029 China Department of Computer Science and Technology Tsinghua University Beijing 100084 China School of Computer Science Cardiff University Cardiff U.K.

In this paper, we present a new technique based on strain fields to carry out 3D shape morphing for applications in computer graphics and related areas. strain is an important geometric quantity used in mechanics to describe the deformation of objects. We apply it in a novel way to analyze and control deformation in morphing. Using position vector fields, the strain field relating source and target shapes can be obtained. By interpolating this strain field between zero and a final desired value we can obtain the position field for intermediate shapes. This method ensures that the 3D morphing process is smooth. Locally, volumes suffer minimal distortion, and no shape jittering or wobbling happens： other methods do not necessarily have these desirable properties. We also show how to control the method so that changes of shape （in particular, size changes） vary linearly with time.

关键词： morphing strain field interpolation

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3-D rheologic model of earthquake preparation (Ⅱ): strain field and its applications

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Acta Seismologica Sinica(English Edition) 2004年第2期17卷 131-143页

作者： SONG Zhi-ping(宋治平) YIN Xiang-chu(尹祥础) MEI Shi-rong(梅世蓉) Earthquake Administration of Shanghai Shanghai 200062 China Center for Analysis and Prediction China Earthquake Administration Beijing 100036 China Center for Analysis and Prediction China Earthquake Administration Beijing 100036 China

On the basis of the three-dimensional elastic inclusion model, the analytic expression of viscoelastic strain field is derived, i.e., the analytic expression of viscoelastic strain at an arbitrary point (x, y, z) in x-axis, y-axis and z-axis produced by three-dimension inclusion in the semi-infinite rheologic medium defined by the standard linear rheologic model, namely the normal strains exx(r, t), eyy(r, t) and ezz(r, t), the shear strains exy(r, t) and eyx(r, t), eyz(r, t) and ezy(r, t), exz(r, t) and ezx(r, t), and the bulk-strain q (r, t). By computing the spatial-temporal variation of bulk strain on the ground produced by a spherical rheologic inclusion in a semi-infinite rheologic medium, we obtained some significant results that the bulk-strain variation with time produced by a hard inclusion has three stages (a, b, g) with different characteristics, which are similar to those of most geodetic deformation curves, but not the case for those by a soft inclusion. It is meaningful that these theoretical results have been applied to explain preliminarily the characteristics of stage variation of spatial-temporal evolution, the pattern and quadrant distribution of earthquake precursors, the changeability, spontaneity and complexity of short-term and imminent-term precursors. It offers a theoretical base to found the physical model of earthquake precursors and a reference to predict physically the earthquakes.

关键词： elastic inclusion theory rheology inclusion theory strain field analytical solution for viscoelastic problem earthquake precursor

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Analyis on the indirect tension displacement and strain field of asphalt mixture based on ABAQUS and DICM

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Journal of Harbin Institute of Technology(New Series) 2011年第4期18卷 63-66页

作者：张魁谭忆秋吴思刚王强徐慧宁 School of Transportation Science & Engineering Harbin Institute of Technology Guangdong Hualu Communication Technology Co. College of Physical Science and Technology Heilongjiang University

In order to study the damage mechanism of asphalt mixture,it is important to obtain the distribution of displacement and strain of its sample in the indirect tension *** a result,the digital image correlation method (DICM) was used to evaluate the displacement field and strain field of asphalt *** results showed that the displacement fields under DICM and ABAQUS are similarly;the strain fields are different due to the different modulus of mastic and aggregate;and DICM is an practical method to study the indirect tension displacement and stain.

关键词： digital image correlation method ABAQUS displacement field strain field

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THE APPLICATION OF MOIRE INTERFEROMETRY IN THE MEASUREMENT OF DISPLACEMENT field AND strain field AT NOTCH-TIP AND CRACK-TIP

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Acta Mechanica Sinica 1991年第4期7卷 376-382页

作者：韩金虎毛天祥 Institute of Mechanics Chinese Academy of SciencesBeijing 100080China

This paper presents the application of Moire interferometry in measuring the displacement and strain field at notch-tip and crack-tip before and after crack *** experiment is carried out using a three point bending beam with a *** N_x and N_y fringe patterns representing displacement field,and the ΔN_x/Δx and ΔN_y/Δy fringe patterns representing the strain field are *** sensitivity of the meas- ured displacement is 0.417μm per fringe *** displacement and strain distribution along the section x=0 have been worked out according to N_x and N_y fringe patterns.

关键词： moire interferometry displacement field strain field necking zone

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Characteristics of present-day active strain field of Chinese mainland

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Earthquake Science 2008年第6期21卷 562-572页

作者：郭良迁李延兴杨国华胡新康 First Crust Monitoring and Application Center China Earthquake Administration

On the basis of the GPS data obtained from repeated measurements carried out in 2004 and 2007,the horizontal principal strain of the Chinese mainland is calculated,which shows that the direction of principal compressive strain axis of each subplate is basically consistent with the P-axis of focal mechanism solution and the principal compressive stress axis acquired by geological *** indicates that the crustal tectonic stress field is relatively stable in regions in a long *** principal compressive stress axes of Qinghai-Tibet and Xinjiang subplates in the western part of Chinese mainland direct to NS and NNE-SSW,which are controlled by the force from the col-lision of the Eurasia Plate and India *** principal compressive strain axes of Heilongjiang and North China subplates in the eastern part direct to ENE-WSW,which shows that they are subject to the force from the collision and underthrust of the Eurasia Plate to the North America and Pacific *** the same time,they are also af-fected by the lateral force from Qinghai-Tibet and Xinjiang *** principal compressive strain axis of South China plate is WNW-ESE,which reflects that it is affected by the force from the collision of Philippine Sea Plate and Eurasia Plate and it is also subject to the lateral force from Qinghai-Tibet *** is apparent from the comparison between the principal compressive strain axes in the periods of 2004～2007 and 2001～2004 that the acting directions of principal compressive stress of subplates in both periods are basically ***,there is certain difference between their directional concentrations of principal compressive stress *** sur-face strain rates of different tectonic units in both periods indicate that the events predominating by compressive variation decrease,while the events predominating by tensile change increase.

关键词： GPS strain field compressive strain axis stress tectonic motion

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Study on the Horizontal Deformation strain field in the Central and Northern Parts of Yunnan Province

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Earthquake Research in China 2003年第1期17卷 14-21页

作者： Li Yanxing, Guo Liangqian and Zhang ZhongfuFirst Crustal Deformation Monitoring Center, CSB, Tianjin 300180, China First Crustal Deformation Monitoring Center CSB Tianjin 300180 China

Based on the horizontal deformation field and the strain field derived from the GPS data over the period of 1999～2001 in the Yunnan area, the characteristics of deformation and strain in the northern part of Yunnan Province have been studied. The results indicate that the central part of the studied area is rather stable with little crustal displacement, while the western and eastern parts are active with larger displacement. The strain field reveals that the orientations of the principal compressive strain axis of the crust and the sub blocks in the area are NW SE, while the orientations of the principal tensile strain axis is NE SW. In the studied area, the tensile strain is predominatly in the northern part and the compressive strain is predominatly in the central and southern parts. The stretching direction of the shear strain contour is basically consistent with the strike of the active fault. The strain and stress fields of the fault activity are related to the structure where the fault is located, while the activity properties of the faults are different.

关键词： GPS Deformation field strain field

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Speckle interferometry for the strain field of geologic structure model

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Chinese Journal of Lasers 1992年第5期 63-70页

作者： Shifan Wang, Li Zhu(Dept. Physics,University of electrinic Science and Technology of China,Chengdu 610054,China)

Based on imitative experiment of structure mechanics,four-aperture defocusedspeckle shearing interferometry is used to obtain the distribution of strain field of the geologicstructure model of the Jiulong mountain in Sichuan *** through the analysis of the ex-perimental data,we can give some experdriental basis for recognizing the distribution of thegeologic fracture in the district of the Jiulong Mountain. Exploration practice shows that fracture distribution predicted by theory agrees with actu-al situation.

关键词： geologic structure model strain field speckle shearing interferometry

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Simulation of surface displacement and strain field of the 2011 Japan Mw9. 0 earthquake

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Geodesy and Geodynamics 2011年第4期2卷 28-32页

作者： Chen Shujun Wu Jianchao Lei Dongning Cai Yongjian Li Heng Zhang Xinlin Institute of Seismology China Earthquake Administration Wuhan 430071 China Institute of Earthquake Engineering of Wuhan Wuhan 430071 China Earthquake Research Institute University of Tokyo 113 - 0032 Japan

Based on dislocation theory of 0kada, we adopted a finite-element fault model inverted by Gavin Hayes from seismic data for the 2011 Japan Mw9.0 earthquake, and obtained the corresponding surface displacement and strain fields. The calculated displacement field is consistent with the observed GPS results in the trend of changes. Also the surface displacement and strain fields both show large variations in space.

关键词： finite fault model fault dislocation displacement field strain field

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Mapping Microscale strain fields Around a Crack Tip in Molybdenum Via Geometric Phase Analysis and Digital Image Correlation

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Acta Mechanica Solida Sinica 2018年第3期31卷 310-321页

作者： Chunwang Zhao Wencai Li Jijun Li Yongxiang Li Quanlong Liu Lifu Wang Qingyu Hou Yongming Xing College of Science Inner Mongolia University of Technology College of Arts and Sciences Shanghai Maritime University School of Physical Science and Technology Inner Mongolia University

Uniaxial tension tests were conducted on single-edge-notched tensile specimens of pure molybdenum with a mesh grid pattern in front of the notch. A series of images of crack initialization and propagation with a distorted mesh grid pattern were obtained by means of in situ scanning electron microscopy. strain fields around the crack tip were mapped successively using geometric phase analysis and digital image correlation techniques, and then compared with the predictions obtained through linear elastic fracture mechanics （LEFM）. The comparison shows that the measured strain distribution ahead of the crack tip is consistent with the LEFM predictions of up to 25 μm from the crack tip.

关键词： Crack strain field Geometric phase analysis Digital image correlation

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