Jilin University

Peking University

Yongmao Pei

Hongwei Zhao

Daining Fang

Hao Zhou

Luquan Ren

Shizhong Zhang

Yang Liu

Zhichao Ma

Jingshi Dong

Qingwei Zhuang

Zunqiang Fan

Shunbo Wang

Qixun Zhang

Zhanwei Huo

Faxin Li

Hui Fan

Ji Fu

Ning Li

Jingchun Ma

Xiaohang Dai

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

Growing community of inventors

Beijing, China

Yongmao Pei