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公开(公告)号：US10365193B2
公开(公告)日：2019-07-30
申请号：US15563358
申请日：2017-01-17
Applicant: Northeastern University
Inventor： Xia ting Feng , Xi wei Zhang , Cheng xiang Yang , Shuai Peng , Jun Tian , Rui Kong , Dong hui Ma
Abstract: An apparatus and method for determining time-dependence failure under constant temperature through high pressure true triaxial loading for hard rock, includes a pressure chamber and four actuators, wherein a sample bearing platform is arranged in a center of the pressure chamber, a sample bearing and containing chamber is arranged in a center of the sample bearing platform, and a confining pressure loading oil supply hole is formed in the sample bearing platform, and communicates with a confining pressure loading injection pump; each actuator includes a sealing cover, an annular end cover, a counter-force cylinder barrel, a piston, a piston rod, a sealing flange and a stress loading injection pump; a heating coil is arranged in the pressure chamber; a force sensor is fixedly mounted at the end part of the piston rod; and a pressure sensor is mounted in the sample bearing platform.
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2.发明授权公开(公告)号：US11852615B2
公开(公告)日：2023-12-26
申请号：US17920553
申请日：2019-09-18
Applicant: Northeastern University
Inventor： Xiating Feng , Xiaojun Yu , Jun Tian
CPC classification number: G01N3/12 , G01N3/066 , G01N2203/0256
Abstract: The invention relates to a one-way rapid electromagnetic unloading device suitable for a true triaxial testing machine, comprising a first electromagnet, a second electromagnet, a first electromagnet mounting base, a second electromagnet mounting base and a restraining disc. A frame of the true triaxial testing machine is provided with a mounting hole for the unloading device. The first electromagnet mounting base is fixedly mounted in the mounting hole for the unloading device, and the first electromagnet is fixedly mounted on the first electromagnet mounting base. The restraining disc is fixedly mounted at an opening of the mounting hole for the unloading device, and the second electromagnet mounting base is located between the restraining disc and the first electromagnet. The second electromagnet is fixedly mounted on the second electromagnet mounting base and is opposite to the first electromagnet.
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Patent Agency Ranking
公开(公告)号：US10324014B2
公开(公告)日：2019-06-18
申请号：US15558958
申请日：2017-03-28
Applicant: Northeastern University
Inventor： Xia ting Feng , Xi wei Zhang , Rui Kong , Cheng xiang Yang , Dong hui Ma , Shuai Peng , Lei Shi , Zhi bin Yao , Jun Tian
Abstract: A high-pressure true triaxial test apparatus with capacity of low-frequency disturbance and high-speed impact includes static and dynamic loading frames, four static loading actuators, two dynamic loading actuators and an SHPB mechanism, wherein all actuators are connected with a hydraulic station system; a hollow way is formed in the axial center of each piston shaft of the dynamic loading actuators, a dynamic pressure sensor adopting a hollow ring structure is mounted at the end part of each piston shaft, and the SHPB mechanism applies a high-speed impact load on a rock sample through the dynamic pressure sensors respectively; and the dynamic loading actuators adopt a static pressure oilway balance support sealing manner and are connected with the hydraulic station system, each oilway is provided with an energy accumulator, and flow is increased by the servo valves to drive pistons to perform dynamic response.
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公开(公告)号：US11326995B2
公开(公告)日：2022-05-10
申请号：US16965521
申请日：2019-09-26
Applicant: Northeastern University
Inventor： Xiating Feng , Jun Zhao , Jun Tian , Chengxiang Yang
Abstract: The invention provides a multi-functional true triaxial shear test device and method for hard rocks, the device comprises a hydraulic system, a left-end combination tangential loading oil cylinder, a right-end combination tangential loading oil cylinder, a front-end combination lateral loading oil cylinder, a rear-end combination lateral loading oil cylinder, an upper normal loading oil cylinder, a lower normal loading oil cylinder, an annular framework, a lateral auxiliary push-and-pull framework, an annular framework support platform, a horizontal support platform and a test chamber. The stiffness of the device is improved, and besides, a total section stress covering loading manner of the rock samples in a shear process is guaranteed. Through improving a temperature reduction manner of front ends of the oil cylinders, the situation that high temperature does not enable the temperature of hydraulic oil in the oil cylinders to rise to affect normal motion of the actuator can be guaranteed.
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5.发明授权公开(公告)号：US10697281B2
公开(公告)日：2020-06-30
申请号：US16061799
申请日：2018-02-12
Applicant: Northeastern University
Inventor： Xiating Feng , Zhengwei Li , Xiwei Zhang , Jun Tian , Chengxiang Yang , Zhibin Yao , Qiang Wang , Yanhua Gong
Abstract: A large-scale three-dimensional physical model test system for a deep cavern group comprises a base, an anti-deformation prestressed loading frame assembly, a load applying assembly, a model sample preparation and transportation assembly and a multifunctional hydraulic loading system assembly. The anti-deformation prestressed loading frame assembly and the model sample preparation and transportation assembly are both arranged on the base. The load applying assembly is arranged on the anti-deformation prestressed loading frame assembly, and the load applying assembly is connected with the multifunctional hydraulic loading system assembly. A model sample is subjected to long-time load holding, dynamic disturbance and displacement control overload under multi-surface multi-point cooperative control through cooperation between the load applying assembly and the multifunctional hydraulic loading system assembly.
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公开(公告)号：US11913336B2
公开(公告)日：2024-02-27
申请号：US17618365
申请日：2021-04-01
Applicant: Northeastern University
Inventor： Xiating Feng , Feng Lin , Chengxiang Yang , Jun Tian , Tianyang Tong , Shiping Li
CPC classification number: E21C51/00 , E21B3/02 , E21B7/00 , E21B15/003 , E21B25/00 , H01P5/12 , H02K11/30
Abstract: The invention relates to a low-power microwave coring machine suitable for lunar rocks and a use method. The low-power microwave coring machine suitable for lunar rocks comprises an equipment platform, wherein the support framework front plate and the support framework rear plate are mounted on the equipment platform in a sliding manner, a rear end surface of the support framework rear plate is connected with a front end of the microwave generator mounted on the equipment platform, a rear end of the microwave generator is sequentially connected with the fixed waveguide, the rotary waveguide, the power divider and the drill drum, the high-precision slip ring structure is mounted on the drill drum, the gear ferrules are arranged on an outer wall of the rotary waveguide and an outer wall of the drill drum.
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公开(公告)号：US11119018B2
公开(公告)日：2021-09-14
申请号：US17059169
申请日：2019-12-20
Applicant: Northeastern University
Inventor： Xiating Feng , Mian Tian , Fengpeng Zhang , Jun Tian , Chengxiang Yang , Jianyu Peng , Yuemao Zhao , Jikai Gao , Jianqing Jiang
Abstract: A true triaxial testing system for disturbance experiment with broadband and low amplitude of a high pressure hard rock includes a low-frequency disturbance true triaxial mechanism, a variable-frequency low-speed disturbance rod mechanism and a rapid single-side unloading type specimen box. The low-frequency disturbance true triaxial mechanism and the variable-frequency low-speed disturbance rod mechanism are distributed along a straight line. The low-frequency disturbance true triaxial mechanism is independently used or cooperates with the variable-frequency low-speed disturbance rod mechanism for use. The rapid single-side unloading type specimen box cooperates with the low-frequency disturbance true triaxial mechanism for use.
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