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inverse analysis of laboratory data and observations for evaluation of backward erosion piping process

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Journal of Rock Mechanics and Geotechnical Engineering 2020年第5期12卷 1080-1092页

作者： Sige Peng John D.Rice School of Civil Engineering and Transportation South China University of TechnologyGuangzhou510640China Department of Civil and Environmental Engineering Utah State UniversityLogan84322UTUSA

An inverse analysis procedure has been developed to interpret collected pore pressure data and observations during backward erosion piping(BEP)initiation and progression in sandy *** procedure has been applied to laboratory models designed to mimic the initiation and progression of BEP through a constricted vertical *** inverse analysis uses three-dimensional(3D)finite element method(FEM)to successively produce models of the hydraulic head regime surrounding progressive stages of BEP based on observations at the sample surface and pore pressure measurements obtained from the laboratory *** inverse analysis results in a series of 3D contour plots that represent the hydraulic-head regime at each stage of the BEP development,allowing for assessing the development of BEP mechanism as well as calculating the critical hydraulic conditions required for various BEP stages to initiate and *** of the results identified four significant stages of the piping process:(1)loosened zone initiation,(2)channel initiation and progression,(3)riser sand fluidization,and(4)loosened zone *** of the hydraulic head contour plots allows assessment of the critical hydraulic gradients needed to initiate and progress various components of the BEP development.

关键词： Backward erosion piping(BEP) Laboratory modeling inverse analysis Finite element method(FEM) Soil loosening Critical gradient

LIQUID PHASE FLOW ESTIMATION IN GAS-LIQUID TWO-PHASE FLOW USING inverse analysis AND PARTICLE TRACKING VELOCIMETRY

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Journal of Hydrodynamics 2004年第6期16卷 730-736页

作者： CHENGWen MURAlYuichi SASAKIToshio YAMAMOTOFujio DepartmentofMechanicalEngineering UniversityofFukuiFukuiJapan DivisionofMechanicalScience HokkaidoUniversityHokkaidoJapan DepartmentofMechanicalEngineering UniversityofFukuiFukuiJapan／／EnvironmentResearchInstituteXianUniversityofTechnologyXi＇an710048China

An inverse analysis algorithm is proposed for estimating liquid phase flowfield from measurement data of bubble motion. This kind of technology will be applied in future forvarious estimation of fluid flow in rivers, lakes, sea surface flow, and also microscopic channelflow as the problem-handling in civil, mechanical, electronic, and chemical engineering. Therelationship between the dispersion motion and the carrier phase flow is governed and expressed bythe trans-lational motion equation of spherical dispersion. The equation consists of all the forcecomponents including inertia, added inertia, drag, lift, pressure gradient force and gravity *** this equation enables us to estimate the carrier phase flow structure using only the data ofthe dispersion motioa Whole field liquid flow structure is also estimated using spatial or temporalinterpolation method. In order to verify this principle, the Taylor-Green vortex flow, and theKarman vortex shedding from a square cylinder have been chosea The results show that the combinationof the inverse analysis and Particle Tracking Velocimetry (PTV) with the spatio-temporalpostprocessing algorithm could reconstruct well the carrier phase flow of the gas-liquid two-phaseflow.

关键词： particle tracking velocimetry(PTV) multiphase flow inverse analysis post-processing algorithm carrier phase dispersed phases

Uncertainty quantification of inverse analysis for geomaterials using probabilistic programming

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Journal of Rock Mechanics and Geotechnical Engineering 2024年第3期16卷 895-908页

作者： Hongbo Zhao Shaojun Li Xiaoyu Zang Xinyi Liu Lin Zhang Jiaolong Ren School of Civil Engineering and Geomatics Shandong University of TechnologyZibo255000China State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil MechanicsChinese Academy of SciencesWuhan430071China

Uncertainty is an essentially challenging for safe construction and long-term stability of geotechnical *** inverse analysis is commonly utilized to determine the physico-mechanical ***,conventional inverse analysis cannot deal with uncertainty in geotechnical and geological *** this study,a framework was developed to evaluate and quantify uncertainty in inverse analysis based on the reduced-order model(ROM)and probabilistic *** ROM was utilized to capture the mechanical and deformation properties of surrounding rock mass in geomechanical *** programming was employed to evaluate uncertainty during construction in geotechnical engineering.A circular tunnel was then used to illustrate the proposed framework using analytical and numerical *** results show that the geomechanical parameters and associated uncertainty can be properly obtained and the proposed framework can capture the mechanical behaviors under ***,a slope case was employed to demonstrate the performance of the developed *** results prove that the proposed framework provides a scientific,feasible,and effective tool to characterize the properties and physical mechanism of geomaterials under uncertainty in geotechnical engineering problems.

关键词： Geological engineering Geotechnical engineering inverse analysis Uncertainty quantification Probabilistic programming

Determination of Flow Curve and Plastic Anisotropy of Medium-thick Metal Plate:Experiments and inverse analysis

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Journal of Iron and Steel Research International 2015年第6期22卷 506-512页

作者： Xin-cun ZHUANG Hua XIANG Tao WANG Zhen ZHAO Tan LI Institute of Forming Technology and Equipment School of Materials Science and EngineeringShanghai Jiao Tong University

Sheet bulk metal forming is widely used for medium thick metal plate due to its convenience in the manu- facture of accurately finished 3D functional components. To obtain precise anisotropy and flow curve of metal plate is a prerequisite for correct simulation of sheet bulk metal forming processes. inverse analysis of compression test was introduced here to evaluate the sensitivity of different flow curve models and geometric influence of compression test specimen. Besides, a methodology was proposed to compute plastic anisotropic coefficients of Hill quadratic yield cri- terion, which is based on the ratios of flow curves obtained by inverse analysis of compression tests using specimens cut in six directions on the medium-thick metal plate. The obtained flow curves and anisotropic coefficients were compared with those calculated from tensile tests. Flow curves based on inverse analysis of compression tests cover the curves of the tensile tests well, while the anisotropic coefficients are different, especially for the coefficient relat- ed to the RT45 direction. To estimate the effectiveness of the proposed method, the calculated material properties and those based on the traditional tensile tests were applied in a rim-hole process simulation. The simulation results based on the material properties from inverse analysis of compression tests accorded with the tested properties better.

关键词： inverse analysis anisotropic coefficient sheet bulk metal forming compression flow curve

inverse analysis of rock displacement based on Improved MSM-PGA

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Inverse Analysis of rock displacement based on Improved MSM-...

Measurement of the In-Plane Thermal Conductivity of Long Fiber Composites by inverse analysis

2009 Second International Workshop on Knowledge Discovery and Data Mining

作者： Guiquan Bi Ning Li State Key Laboratory of Frozen Soil Engineering CAREERI CAS Lanzhou Gansu China 730000 Xingyan Cheng Tinghong Zhao College of Fluid Power and Control Lanzhou University of Technology Lanzhou Gansu China 730050

＜正＞inverse analysis of rock displacement is a kind of new way of studying the parameter of physical power of rock, a lot of researchers have carried on research in this respect, and some researchers among them ask solving this question with the genetic *** paper apply master-slaver model parallel genetic algorithm（MSM-PGA ） to solve inverse analysis of rock displacement,in the course of solving,has carried on certain improvement to the original algorithm,has resolved the task of the master course and slaver course,and when concrete heredity is operated,having adopted the adaptive hereditary *** result of emulation experimental shows,MSM-PGA after improving has not merely overcome the shortcoming of original MSM-PGA,and effective improvement the speed and precision of calculation, has guaranteed the dependability of analysis result.

关键词： inverse analysis rock displacement MSM-PGA

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Open Journal of Composite Materials 2017年第2期7卷 85-98页

作者： Bassam Assaf Vincent Sobotka Francois Trochu Applied Research Center on Polymer(CRASP) Department of Mechanical EngineeringEcole Polytechnique de MontrealStation“Centre-Ville”MontrealCanada

In the present work, inverse thermal analysis of heat conduction is carried out to estimate the in-plane thermal conductivity of composites. Numerical simulations were performed to determine the optimal configuration of the heating system to ensure a unidirectional heat transfer in the composite sample. Composite plates made of unsaturated polyester resin and unidirectional glass fibers were fabricated by injection to validate the methodology. A heating and cooling cycle is applied at the bottom and top surfaces of the sample. The thermal conductivity can be deduced from transient temperature measurements given by thermocouples positioned at three chosen locations along the fibers direction. The inverse analysis algorithm is initiated by solving the direct problem defined by the one-dimensional transient heat conduction equation using a first estimate of thermal conductivity. The integral in time of the square distance between the measured and predicted values is the criterion minimized in the inverse analysis algorithm. Finally, the evolution of the in-plane composite thermal conductivity can be deduced from the experimental results by the rule of mixture.

关键词： inverse analysis In-Plane Thermal Conductivity Mold Design

Wedge Splitting Test and inverse analysis on Fracture Behaviour of Fiber Reinforced and Regular High Performance Concretes

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Journal of Civil Engineering and Architecture 2014年第5期8卷 595-603页

作者： Kamil Hodicky Thomas Hulin Jacob W. Schmidt Henrik Stang Department of Civil Engineering Technical University of Denmark Kongens Lyngby DK-2800 Denmark

The fracture behaviour of three fiber reinforced and regular HPC （high performance concretes） is presented in this paper. Two mixes are based on optimization of HPC whereas the third mix was a commercial mix developed by CONTEC ApS （Denmark）. The wedge splitting test setup with 48 cubical specimens was used experimentally and the cracked non-linear hinge model based on the fictitious crack model was applied for the interpretation of the results. The stress-crack opening relationships were extracted by using inverse analysis algorithm for various multi-linear softening curves. This showed that the refinement of the softening curves reflects in improved accuracy of the WST （wedge splitting test） simulation in comparison with bi-linear softening curves with acceptable increase of computational time. Furthermore, the fracture mechanics parameters such as COD （crack opening displacement）, fracture energy and characteristic length were experimentally determined. Experiments were performed at 1, 3, 7 and 28 days. Fracture energy, Gf, was found to increase with age, while the characteristic length, Lch, was found to decrease.

关键词： High performance concrete wedge splitting test inverse analysis fictitious crack model.

Biaxial tensile behavior of Ti-6Al-4V under proportional loading

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Chinese Journal of Aeronautics 2023年第5期36卷 344-362页

作者： Lin QI Yazhou GUO Kanghua JIN Huaipu KANG Yulong LI School of Aeronautics Northwestern Polytechnical UniversityXi’an 710072China Shaanxi Key Laboratory of Impact Dynamics and Engineering Applications Northwestern Polytechnical UniversityXi’an 710072China School of Civil Aviation Northwestern Polytechnical UniversitySuzhou 215699China NPU Yangzi River Delta Research Institute Suzhou 215400China

The biaxial tensile behavior of isotropic Ti-6Al-4 V is characterized in this paper.A novel cruciform specimen was designed and optimized to achieve uniform stress and strain distribution within the gauge *** tensile tests were conducted at three different loading ratios by the biaxial testing *** Digital Image Correlation(DIC)technique was applied to determine strain distribution,and a high-speed camera was employed to record the fracture *** inverse analysis(IA)approach with a combined experimental and numerical method was proposed to determine the true stresses at the gauge section of the specimen during biaxial tensile *** results indicate that the initial yield locus can be described by the Cazacu criterion accurately,whereas the Mises criterion can predict better the strengthening behavior of Ti-6Al-4 V in the first quadrant in the principal stress space.

关键词： Biaxial tensile testing inverse analysis Strengthening behavior Ti-6Al-4V Yield locus

NUMERICAL MODELING FOR POSITIVE AND inverse PROBLEMS OF 3-D SEEPAGE IN DOUBLE FRACTURED MEDIA

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Journal of Hydrodynamics 2005年第2期17卷 186-193页

作者： ZHOUZhi-fang GUOGeng-xin_] CollegeofCivilEngineering HohaiUniversityNanjing210098China

Three-dimensional seepage in double fractured media was modeled in this paper. The determination of hydraulic conductivity tensor of rock mass is a vital problem for the sea water intrusion or sea water encroachment and seepage of fissured medium. According to the geological and hydrogeological conditions for the 2nd-stage construction of the Three Gorges Project (TGP), the physical and mathematical models for the groundwater movement through the 3D double fractured media of rock mass during construction were established in this paper. Based on discontinuity-control inverse theory, some related parameters of double fractured media were inversed with flux being the known quantity and calibration of water table the objective function. Synchronously, the seepage field of the construction region was systematically analyzed and simulated, the results of which exhibit that the double fractured media model of fracture water can comprehensively and correctly describe the geological and hydrogeological conditions in the construction region.

关键词： Three Gorges Project (TGP) double fractured media model inverse analysis specific storativity transference coefficient