Jilin University

Beijing Institute of Technology

Peking University

Daining Fang

Hongwei Zhao

Yongmao Pei

Luquan Ren

Hao Zhou

Zhichao Ma

Shizhong Zhang

Qingwei Zhuang

Jingshi Dong

Zunqiang Fan

Shuo Yang

Yang Liu

Shunbo Wang

Tao Shang

Zhanwei Huo

Zhaoliang Qu

Chenqi Wang

Qixun Zhang

Faxin Li

Yazheng Yang

Kaiyuan Xue

Jianping Li

Li Xi

Hu Huang

Panfeng Zhang

Xiaoli Hu

Hongbing Cheng

Jing Gao

Xiaolong Dong

Yong Hu

Rongqi Zhu

Jingchun Ma

Lijie Qu

Baosheng Xu

Kehong Tang

Yanfei Chen

Ji Fu

Hui Fan

Ning Li

Fu Zhang

Qing Zou

Xiaohang Dai

Yuxiang Zhu

A rotary-transmission-target microfocus X-ray source and an X-ray generation method based on the rotary-transmission-target microfocus X-ray source are provided. The X-ray source comprises a chamber, and an electron beam system is installed in the chamber. The electron beam system is arranged on a same side as an anode target rotating shaft. A motor in a rotary anode target system drives an anode target to rotate through a bevel gear transmission device. The microstructure of a target is designed. An electron beam emitted by the electron beam system vertically bombards the metal target of the rotating anode target. A cooling system is configured to cool the anode target.

Rotary-transmission-target microfocus X-ray source and ray generation method

Disclosed is a material with directional thermal conduction and thermal insulation and a preparation method thereof. The method includes: (1) dispersing a viscose-based carbon fiber in water and adding a phenolic resin and polyacrylamide sequentially to obtain a dispersion I; dispersing a high-thermal conduction carbon fiber in water and adding a phenolic resin and polyacrylamide sequentially to obtain a dispersion II; (2) dividing equally the dispersion I and the dispersion II into several parts, respectively, pouring each part of the dispersion I and each part of the dispersion II into a mold alternately until all the dispersion I and the dispersion II are poured, draining after each pouring of a part of the dispersion I or a part of the dispersion II to obtain a porous carbon fiber skeleton, and solidifying the skeleton to obtain a preform; (3) subjecting the preform to a heat treatment to obtain the material.

Material with directional thermal conduction and thermal insulation and preparation method thereof

A high-temperature in-situ loaded computed tomography (CT) testing system based on a laboratory X-ray source and a method therefor are provided. A dynamic sealing device is adopted. A pull-up pressure rod and a pull-down pressure rod are allowed to rotate circumferentially and move axially. Meanwhile, a high-temperature furnace is fixed without rotating or moving, such that the high-temperature furnace is flat in an imaging direction to shorten an imaging distance and improve imaging quality. An independent tensile testing machine is utilized to achieve high-load loading. The in-situ measurement of internal deformation and damage information of a specimen under tensile or compressive load in a high-temperature environment is implemented. By taking advantage of the miniaturization design of the high-temperature device, the accuracy of the damage test using the laboratory X-ray source is increased. Tests and researches on the internal damage and failure behavior of the high-temperature materials can be conducted.

High-temperature in-situ loaded computed tomography testing system based on laboratory X-ray source and method therefor

A system for in-situ testing of mechanical properties of materials in static and dynamic load spectra, that includes: an Arcan biaxial clamping subsystem, a press-in test subsystem, a biaxial fatigue test subsystem, a biaxial pre-tension loading subsystem, a signal detection subsystem, and a support and adjustment subsystem. A combined guide mechanism in the Arcan biaxial clamping subsystem is rigidly connected to a guide mechanism support block, an x-direction three sensor base and a y-direction force sensor base in the support and adjustment subsystem by threaded connections, respectively. A laser transmitter, a voice coil motor and a laser receiver in the press-in test subsystem are rigidly connected to a two-degree-of-freedom electric moving platform for the laser transmitter, a two-degree-of-freedom electric moving platform for the voice coil motor and a two-degree-of-freedom electric moving platform for the laser receiver in the support and adjustment subsystem by threaded connections, respectively.

System and method for in-situ testing of mechanical properties of materials in static and dynamic load spectra

Provided are a material in-situ test device and method under multi-load and multi-physical field coupled service conditions. The device is composed of a precise six-degree-of-freedom composite load applying module, a precise torsion module, a precise indentation module, a clamp module and a control module which work together to complete a composite-load and multi-physical field coupled experiment, and is integrated with a digital speckle strain measurement and infrared thermal imaging module and a microscope observation module, so as to carry out in-situ observation and quantitative characterization on material deformation behaviors and damage mechanism phenomena in a composite-load and multi-physical field loading process. For example, loading methods of 'cantilever type pure bending, cantilever type tension/compression-torsion, and cantilever type bending-torsion', etc. can realize the loading of composite load. Silicon nitride ceramic heating sheets, Peltier tiles and current loading are used for achieving simulation of multiple physical fields such as cold/hot-electricity fields.

Material in-situ detection device and method under multi-load and multi-physical field coupled service conditions

A method for testing a local magnetomechanical coupling coefficient of a magnetic material includes defining a square of a local magnetomechanical coupling coefficient kas a the ratio of a magnetic energy stored in a magnetic material to an input reversible mechanical work, and characterizing the local magnetomechanical coupling coefficient of the magnetic material by measuring nano-indentation load-depth curves of the magnetic material under both situations of a saturated magnetic field and an unsaturated magnetic field. The method is simple in operation and has the advantages in local performance test of composite materials and other heterogeneous materials and also in small-scale performance test of nano-films.

Method for testing local magnetomechanical coupling coefficient of a magnetic material

A device and associated method for adjusting electrical impedance based on contact action are disclosed. The device includes a drive unit (), a contact unit (), a monitoring unit (), and a control unit (). The monitoring unit () measures an impedance signal of an electromagnetic functional material () in an alternating-current circuit, and transfers the impedance signal to the control unit (). In response to the impedance signal measured by the monitoring unit (), the control unit () controls the drive unit () to apply a mechanical load on the contact unit (), which causes the contact unit () to contact the electromagnetic functional material (). The value of a contact load is adjusted, so as to adjust the electrical impedance of the electromagnetic functional material (), thereby achieving the objective of adjusting the impedance matching in the alternating-current circuit in real time.

Device and a method for adjusting electrical impedance based on contact action

An in-situ testing equipment for testing micromechanical properties of a material in a multi-load and multi-physical field coupled condition is disclosed. The equipment comprises a frame supporting module, a tension/compression-low cycle fatigue module, a torsioning module (), a three-point bending module (), an impressing module (), a thermal field and magnetic field application module (), an in-situ observation module () and a clamp body module (). The testing equipment is capable of realizing applications of five different types of loads including tension/compression, low cycle fatigue, torsion, bending and impressing, performing an intensive study on micromechanical properties of the material in the multi-load and multi-physical field coupled condition by using built-in electric, thermal and magnetic application modules and the in-situ observation module, and acquiring relations between deformation behavior, mechanism of damage, performance weakening of the material, applied loads and material properties.

In-situ testing equipment for testing micromechanical properties of material in multi-load and multi-physical field coupled condition

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Beijing, China

Daining Fang