The Experts below are selected from a list of 324 Experts worldwide ranked by ideXlab platform
Luhe Shen - One of the best experts on this subject based on the ideXlab platform.
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reliability analysis of in situ Stress Measurement using circumferential velocity anisotropy
Journal of rock mechanics and geotechnical engineering, 2011Co-Authors: Luhe ShenAbstract:Abstract In-situ Stress Measurement for deep reservoir formation is difficult in terms of security, reliability and technique. Acoustic velocity anisotropy test is a basic method for Stress Measurement of rock cores, which is based on the distribution of acoustic velocity in different directions around rock cores. The heterogeneity of core samples, such as fractures and gravel contained, can also lead to wave velocity anisotropy. Therefore, the corresponding reliability evaluation method is established to exclude some other anisotropy factors caused by non-tectonic Stresses. In this paper, the reliability of testing results is evaluated from three aspects, i.e. phase difference, anisotropy index and waveform, to remove the factors caused by non-tectonic Stresses.
Michael E. Fitzpatrick - One of the best experts on this subject based on the ideXlab platform.
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Surface preparation for residual Stress Measurement of an accelerated corrosion tested welded marine steel
Corrosion Science, 2015Co-Authors: Bilal Ahmad, Michael E. FitzpatrickAbstract:Residual Stress Measurement is often required for the assessment of structural integrity of components. Measurement of residual Stress in corrosion tested specimens is challenging owing to the difficulty of accessing the surface because of the rust layer. This study explored the potential methods for the surface preparation of an ultrasonically-peened and accelerated corrosion tested DH36 marine steel fillet welded specimen to ease the way for subsequent residual Stress Measurement using neutron diffraction and the contour method. We find that hydroblasting introduces compressive residual Stress at the surface that will alter the surface Stress to be measured.
Marcio C. Fredel - One of the best experts on this subject based on the ideXlab platform.
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Residual Stress Measurement techniques for Ti6Al4V parts fabricated using selective laser melting: state of the art review
Rapid Prototyping Journal, 2020Co-Authors: Ruben B.o. Acevedo, Klaudia Kantarowska, Edson Costa Santos, Marcio C. FredelAbstract:Purpose This paper aims to generate a review of available techniques to measure Residual Stress (RS) in Ti6Al4V components made by Ti6Al4V. Design/methodology/approach State of the art; literature review in the field of Residual Stress Measurement of Ti6Al4V parts made by selective laser melting (SLM). Findings Different Residual Stress Measurement techniques were detailed, regarding its concept, advantages and limitations. Regarding all researched references, hole drilling (semi destructive) and X-ray diffraction (nondestructive) were the most cited techniques for Residual Stress Measurement of Ti6Al4V parts made by SLM. Originality/value An extensive analysis of RS Measurement techniques for Ti6Al4V parts made by SLM.
Hua Peng - One of the best experts on this subject based on the ideXlab platform.
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advance of in situ Stress Measurement in china
Journal of rock mechanics and geotechnical engineering, 2011Co-Authors: Hua PengAbstract:In-situ Stress is an essential parameter for design and construction of most engineering projects that involve excavation in rocks. Progress in in-situ Stress Measurement from the 1950s in China is briefly introduced. Stress relief by overcoring technique and hydraulic fracturing technique are the two main techniques for in-situ Stress Measurement in China at present. To make them suitable for application at great depth and to increase their measuring reliability and accuracy, a series of techniques have been developed. Applications and achievements of in-situ Stress Measurement in Chinese rock engineering, including mining, geotechnical and hydropower engineering, and earthquake prediction, are introduced. Suggestions for further development of in-situ Stress Measurement are also proposed.
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new development of hydraulic fracturing technique for in situ Stress Measurement at great depth of mines
Journal of University of Science and Technology Beijing Mineral Metallurgy Material, 2008Co-Authors: Hua Peng, Hongguang JiAbstract:Abstract In-situ Stress Measurement using the hydraulic fracturing technique was made at Wanfu Coal Mine in Shandong Province, China. To solve problems caused by great measuring depth and extra thick overburden soil layers in the mine, a series of improved techniques were developed for the traditional hydraulic fracturing technique and equipment to increase their pressure-enduring ability and to ensure safe and flexible removal of the sealing packers with other experimental apparatus. Successful in-situ Stress Measurement at 37 points within 7 boreholes, which were mostly over 1000 m deep, was completed. Through the Measurement, detailed information of in-situ Stress state has been provided for mining design of the mine. The improved hydraulic fracturing technique and equipment also provide reliable tools for in-situ Stress Measurement at great depth of other mines.
Miran Kovač - One of the best experts on this subject based on the ideXlab platform.
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A method for residual Stress Measurement in welded seams
Journal of Materials Processing Technology, 1995Co-Authors: Miran KovačAbstract:The paper discusses a method for residual Stress Measurement in the direction transverse to the welded seam. The residual Stresses are measured by means of electrochemical removal and the simultaneous Measurement of strain using a strain gauge. The method is simple and enables Measurement over the whole cross-section of the welded specimen: this ability is the most significant feature of this method. The method enables optimisation of the welding parameters. It is possible to analyse the influence of each individual pass of the welding electrode on the residual Stress distribution, the latter being very important in dynamically loaded welded parts. The present method for residual Stress Measurement is not only useful for the welding of parts, but is helpful also in a variety of other applications.
