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Shock-induced fracture of dolomite rock in small-scale blast tests

Journal of Rock Mechanics and Geotechnical Engineering 2022年第6期14卷 1823-1835页

作者： Pawel Baranowski Michal Kucewicz mateusz pytlik Jerzy Matachowski Military University of Technology Faculty of Mechanical EngineeringInstitute of Mechanics&Computational Engineering2 Gen.S.Kaliskiego Street00-908WarsawPoland Central Mining Institute Conformity Assessment Body40-166KatowicePoland

This paper attempts to study dolomite failure using small-scale blast *** experimental setup consisted of a cylindrical specimen with a central borehole fitted with a detonation cord inside a copper *** specimen was confined using lead *** the test,acceleration histories were recorded using sensors placed on the lead *** results showed that heterogeneity and initial cracks significantly influenced the observed failure and cracking *** tests were numerically represented using the previously validated Johnson-HolmquistⅡ(JH-2)constitutive *** properties of the detonation cord were first determined and verified in a special test with a lead specimen to compare the deformation in the test with that of numerical ***,the small-scale blast test was simulated,and the failure of the dolomite was compared with the test *** of acceleration histories,scabbing failure,and number of radial cracks and crack density confirmed the overall repeatability of the actual testing *** is likely that the proposed model can be further used for numerical studies of blasting of dolomite rock.

关键词： Johnson-HolmquistⅡmodel(JH-2) Rock Blasting Fracture Small-scale test

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Performance of identical rockbolts tested on four dynamic testing rigs employing the direct impact method

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Journal of Rock Mechanics and Geotechnical Engineering 2021年第4期13卷 745-754页

作者： Charlie C.Li John Hadjigeorgiou Peter Mikula Greig Knox Bradley Darlington Renee Royer Andrzej pytlik Michael Hosp Norwegian University of Science and Technology(NTNU) TrondheimNorway University of Toronto TorontoCanada Mikula Geotechnics Pty.Ltd. KalgoorlieAustralia New Concept Mining JohannesburgSouth Africa Sandvik Mining&Rock Technology HeatherbraeAustralia CanmetMINING Natural Resources CanadaOttawaCanada Central Mining Institute KatowicePoland Minova Innovation and Development Ground SupportFeistritzAustria

Impact drop tests are routinely used to examine the dynamic performance of *** impact tests have been carried out in the past decades on independently designed,constructed and operated testing *** laboratory has developed testing procedures;thus,the results are often reported in different ways by various *** inconsistency in testing procedures and reporting formats presents a challenge when comparing results from different laboratories.A series of impact tests of identical rockbolts was carried out using the direct impact method(*** mass free-fall method)on the rigs in four laboratories in different *** purpose of these tests was to investigate the level of consistency in the results from the four *** rig demonstrated a high level of repeatability,but differences existed between the various *** differences would suggest that there is noticeable equipment-dependent bias when test results obtained from different laboratories are *** was also observed that the energy dissipated for the plastic displacement of the bolt was smaller than the impact energy in the *** average impact load(AIL)and the ultimate plastic displacement(D)of the bolt describe the ultimate dynamic performance of the *** the case where the bolt does not rupture,the specific plastic energy(SPE)is an appropriate parameter in describing the impact performance of the *** other relevant parameters are the first peak load(FPL)and the initial stiffness(K)of the bolt *** information from this test series will guide the formulation of standardised testing procedures for dynamic impact tests of rockbolts.

关键词： Dynamic test Drop test Impact test Rockbolt Rock reinforcement Ground support

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USB3.0电路保护

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电子产品世界 2013年第6期20卷 64-67页

作者： Pete pytlik Littelfuse

USB3.0接口设备集合了通信速度为5Gbps的四个额外的数据通道,而且电源总线也有着高达900mA的最大输出电流。这些新的USB3.0规格加上集成芯片几何尺寸的不断缩小,使得预防电气瞬变和过流故障也变得更重要复杂。即使是很小的静电放电(ESD... 详细信息

USB3.0接口设备集合了通信速度为5Gbps的四个额外的数据通道,而且电源总线也有着高达900mA的最大输出电流。这些新的USB3.0规格加上集成芯片几何尺寸的不断缩小,使得预防电气瞬变和过流故障也变得更重要复杂。即使是很小的静电放电(ESD)和短路事故带来的危害也相比更大。寄生电容,低钳位电压和低电阻成为电路保护元件选择中的关键指标。本文网络版地址:http://***/article/145483.

关键词： USB 3 0 电路保护 ESD保护超高速电路数据完整性

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