CN104990787A - Parallel-disc material characteristic experimental device - Google Patents
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- 239000000463 material Substances 0.000 title claims abstract description 78
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- 238000002474 experimental method Methods 0.000 claims abstract description 38
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- 238000010008 shearing Methods 0.000 abstract description 13
- 239000002131 composite material Substances 0.000 abstract description 7
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- 239000012530 fluid Substances 0.000 description 8
- 238000000034 method Methods 0.000 description 6
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- 239000010426 asphalt Substances 0.000 description 4
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- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
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Abstract
本发明涉及一种可实现基于剪切模式、挤压模式及其复合模式的材料特性检测的平行盘式材料特性实验装置，它包括一组对应的上下平行盘和pc机，由挤压加载电机驱动连接可沿机架导轨上下移动的滑块，固设在滑块下端的由剪切加载电机驱动连接的减速器，减速器的输出轴与所述的上平行盘相固连，所述的下平行盘的下端依次通过扭矩传感器和压力传感器固设在L形机架的底座上；所述的滑块上的直线位移传感器，减速器输出轴上的角位移传感器、扭矩传感器和压力传感器分别通过数据采集卡与pc机通讯连接，挤压加载电机和剪切加载电机分别通过驱动器与pc机控制连接。在该装置上可实现多种材料的剪切模式、挤压模式及复合模式下的稳态与动态的材料特性实验。
The present invention relates to a kind of parallel disk type material characteristic experiment device that can realize the material characteristic detection based on shearing mode, extrusion mode and its composite mode, it comprises a group of corresponding upper and lower parallel disks and pc machine, is loaded by extrusion motor The drive is connected to the slider that can move up and down along the guide rail of the rack, and the reducer fixed at the lower end of the slider is driven and connected by the shear loading motor. The output shaft of the reducer is fixedly connected to the upper parallel disk. The lower end of the lower parallel disc is sequentially fixed on the base of the L-shaped frame through the torque sensor and the pressure sensor; the linear displacement sensor on the slider, the angular displacement sensor, the torque sensor and the pressure sensor on the output shaft of the reducer are respectively The data acquisition card is connected to the PC through communication, and the extrusion loading motor and the shearing loading motor are respectively controlled and connected to the PC through a driver. Steady and dynamic material property experiments in shear mode, extrusion mode and composite mode of various materials can be realized on this device.
Description
技术领域technical field
本发明涉及材料动态力学分析的实验设备，特别是一种可实现基于剪切模式、挤压模式及其复合模式的材料特性实验装置。The invention relates to experimental equipment for dynamic mechanical analysis of materials, in particular to an experimental device for material properties based on shear mode, extrusion mode and composite mode.
背景技术Background technique
在材料特性实验中，根据测试方式不同，材料特性主要有基于剪切模式和基于挤压模式等检测方法。基于剪切模式的测试方法是应用两个同轴旋转的平行盘(或圆筒)，在两盘之间放置被测材料，利用两盘的相对转动使被测弹性体承受剪切力，利用力矩传感器检测传递的力矩，求出剪切应力和相应的剪切速率，进一步求出表观粘度或者储能模量、损耗模量。基于挤压模式的测试方法是利用平行的圆盘做相对的拉开和接近运动，在压力作用下被测物质会有不同程度的压缩变形，测得弹性体的弹性性能。In the material property experiment, according to different test methods, there are mainly detection methods based on shear mode and extrusion mode. The test method based on the shear mode is to apply two parallel disks (or cylinders) rotating coaxially, place the material to be tested between the two disks, and use the relative rotation of the two disks to make the elastic body under test bear the shear force. The torque sensor detects the transmitted torque, calculates the shear stress and the corresponding shear rate, and further calculates the apparent viscosity, storage modulus, and loss modulus. The test method based on the extrusion mode is to use parallel discs to make relative pulling and approaching movements. Under the action of pressure, the tested substance will have different degrees of compression deformation, and the elastic properties of the elastomer are measured.
目前国际上针对剪切模式、挤压模式的实验设备多种多样，但多样性只存在于传感器等结构布置以及驱动方式上存在的差异，进行实验的原理几近相同。目前很少有实验设备可以进行挤压和剪切复合工作模式的材料特性实验且受实验装置的局限可进行材料实验的材料范围较小。另外，对于智能材料(磁流变液、磁流变弹性体等)在挤压作用下的流变性能的研究仍处于初级阶段。At present, there are many kinds of experimental equipment for shear mode and extrusion mode in the world, but the diversity only exists in the differences in the structural arrangement of sensors and driving methods, and the principle of conducting experiments is almost the same. At present, there are very few experimental equipments that can carry out the material property experiments of extrusion and shear composite working modes, and the range of materials that can be used for material experiments is limited by the limitations of experimental equipment. In addition, research on the rheological properties of smart materials (magnetorheological fluids, magnetorheological elastomers, etc.) under extrusion is still in its infancy.
发明内容Contents of the invention
本发明的目的在于为克服目前材料特性实验设备的局限性，提出一种可进行多种材料特性实验的平行盘式材料特性实验装置。可实现弹性材料的挤压实验、稳态与动态的剪切实验以及不同预紧力下的挤压剪切复合实验及磁流变液、磁流变弹性体等智能材料的剪切和挤压工作模式的实验。The object of the present invention is to propose a parallel disc material property experiment device capable of performing various material property experiments in order to overcome the limitations of current material property test equipment. It can realize extrusion experiments of elastic materials, steady state and dynamic shear experiments, extrusion and shear composite experiments under different preloads, and shear and extrusion of smart materials such as magnetorheological fluids and magnetorheological elastomers. Experiment with working mode.
本发明平行盘式材料特性实验装置，包括一组对应的上平行盘、下平行盘和pc机；在一L形机架的上端固设一挤压加载电机，固设在机架的垂向导轨上设置可沿该导轨移动的滑块，挤压加载电机的输出轴通过联轴器及丝杠螺母副与滑块驱动连接；在滑块的下端固设一由剪切加载电机驱动连接的减速器，减速器的输出轴与所述的上平行盘相固连，所述的下平行盘的下端依次通过扭矩传感器和压力传感器固设在L形机架的底座上；Parallel disk type material characteristic experiment device of the present invention comprises a group of corresponding upper parallel disks, lower parallel disks and pc machines; an extrusion loading motor is fixed on the upper end of an L-shaped frame, and is fixed on the vertical direction of the frame. A slider that can move along the guide rail is set on the guide rail, and the output shaft of the extrusion loading motor is driven and connected with the slider through a coupling and a screw nut pair; reducer, the output shaft of the reducer is fixedly connected to the upper parallel disk, and the lower end of the lower parallel disk is fixed on the base of the L-shaped frame through a torque sensor and a pressure sensor in turn;
在所述的滑块上设有直线位移传感器，在减速器的输出轴上设有角位移传感器；A linear displacement sensor is provided on the slider, and an angular displacement sensor is provided on the output shaft of the reducer;
所述的扭矩传感器、压力传感器、直线位移传感器和角位移传感器分别通过数据采集卡与pc机通讯连接，所述的挤压加载电机和剪切加载电机分别通过驱动器与pc机控制连接。The torque sensor, the pressure sensor, the linear displacement sensor and the angular displacement sensor are respectively connected to the PC through a data acquisition card, and the extrusion loading motor and the shearing loading motor are respectively connected to the PC through a driver.
还包括嵌置在下平行盘表面上的线性霍尔传感器和分别套置在上平行盘、下平行盘外周的两个分别与直流电源电连接的激磁线圈，线性霍尔传感器通过数据采集卡与pc机通讯连接。It also includes a linear Hall sensor embedded on the surface of the lower parallel disk and two excitation coils respectively sleeved on the outer circumference of the upper parallel disk and the lower parallel disk and respectively connected to the DC power supply. The linear Hall sensor is connected to the PC through the data acquisition card. machine communication connection.
所述的上、下平行盘由导磁材料制备。The upper and lower parallel disks are made of magnetically permeable material.
采用本发明平行盘式材料特性实验装置可实现以下材料特性实验检测：Adopting the parallel disk material characteristic experiment device of the present invention can realize the following material characteristic experiment detection:
橡胶、沥青等材料剪切变形下的材料特性；Material properties of rubber, asphalt and other materials under shear deformation;
橡胶、沥青等材料挤压变形下的材料特性；Material properties of rubber, asphalt and other materials under extrusion deformation;
橡胶、沥青等材料同时受剪切变形和挤压变形下的材料特性；Material properties of rubber, asphalt and other materials under shear deformation and extrusion deformation at the same time;
磁流变液、磁流变弹性体等材料剪切变形下的材料特性；Material properties of materials such as magnetorheological fluids and magnetorheological elastomers under shear deformation;
磁流变液、磁流变弹性体等材料挤压变形下的材料特性；Material properties of magnetorheological fluids, magnetorheological elastomers and other materials under extrusion deformation;
磁流变液、磁流变弹性体等同时受剪切变形和挤压变形下的材料特性。Material properties of magnetorheological fluids, magnetorheological elastomers, etc. under simultaneous shear deformation and extrusion deformation.
本发明具有以下突出优点：The present invention has the following outstanding advantages:
1)本发明平行盘式材料特性实验装置功能多样，有能力实现剪切模式、挤压模式等多种工作模式复合手段下的材料特性实验。1) The parallel disk material property experiment device of the present invention has multiple functions, and is capable of realizing material property experiments under multiple working modes such as shear mode and extrusion mode.
2)本发明实验适用范围广。既可以满足弹性、粘弹性材料(如橡胶、沥青等)的材料特性研究要求，又有能力进行磁流变液、磁流变弹性体等智能材料的材料特性实验。2) The experiment of the present invention has a wide range of application. It can not only meet the research requirements of material properties of elastic and viscoelastic materials (such as rubber, asphalt, etc.), but also has the ability to conduct material property experiments of smart materials such as magnetorheological fluids and magnetorheological elastomers.
3)本发明实验装置由于激磁线圈、线性霍尔传感器的引入和布置可以满足磁流变液、磁流变弹性体等智能材料的剪切和挤压、拉伸(强磁场环境下)工作模式的研究要求，保证磁感应强度方向始终垂直于上下平行盘的旋转方向，且能够提供的磁感应强度变化范围大、变化准确、迅速。3) Due to the introduction and arrangement of excitation coils and linear Hall sensors, the experimental device of the present invention can meet the working modes of shearing, extrusion, and stretching (in a strong magnetic field environment) of smart materials such as magnetorheological fluids and magnetorheological elastomers. According to the research requirements, the direction of the magnetic induction intensity is always perpendicular to the rotation direction of the upper and lower parallel disks, and the magnetic induction intensity that can be provided has a wide range of changes, accurate and rapid changes.
附图说明Description of drawings
图1是一种平行盘式材料特性实验装置的主视图；Fig. 1 is the front view of a kind of parallel disc material property experiment device;
图2是一种平行盘式材料特性实验装置的侧视图；Fig. 2 is a side view of a kind of parallel disc material characteristic experiment device;
图3是又一种平行盘式材料特性实验装置结构的主视图；Fig. 3 is the front view of the structure of another kind of parallel disk material characteristic experiment device;
图4是图1中所示下平行盘9的局部结构示意图。FIG. 4 is a partial structural schematic diagram of the lower parallel disk 9 shown in FIG. 1 .
具体实施方式Detailed ways
以下结合附图给出的实施例对本发明作进一步详细说明。The present invention will be described in further detail below in conjunction with the embodiment given with accompanying drawing.
实施例1Example 1
参照图1和2，一种平行盘式材料特性实验装置，包括一组对应的上平行盘8、下平行盘9和pc机；在一L形机架12的上端固设一挤压加载电机1，固设在机架12的垂向导轨5上设置可沿该导轨移动的滑块4，挤压加载电机1的输出轴通过联轴器2及丝杠螺母副3与滑块4驱动连接；在滑块4的下端固设一由剪切加载电机6驱动连接的减速器7，减速器7的输出轴与所述的上平行盘8相固连，所述的下平行盘9的下端依次通过扭矩传感器10和压力传感器11固设在L形机架12的底座上；With reference to Fig. 1 and 2, a kind of parallel disk type material characteristic experiment device comprises a group of corresponding upper parallel disk 8, lower parallel disk 9 and pc machine; An extrusion loading motor is fixedly installed on the upper end of an L-shaped frame 12 1. The slider 4 is fixed on the vertical guide rail 5 of the frame 12 and can move along the guide rail. The output shaft of the extrusion loading motor 1 is driven and connected with the slider 4 through the coupling 2 and the screw nut pair 3. ; A speed reducer 7 driven and connected by the shear loading motor 6 is fixed at the lower end of the slide block 4, the output shaft of the speed reducer 7 is fixedly connected with the described upper parallel disk 8, and the lower end of the described lower parallel disk 9 The torque sensor 10 and the pressure sensor 11 are fixed on the base of the L-shaped frame 12 in sequence;
在所述的滑块4上设有直线位移传感器13，在减速器7的输出轴上设有角位移传感器14；A linear displacement sensor 13 is provided on the slider 4, and an angular displacement sensor 14 is provided on the output shaft of the speed reducer 7;
所述的扭矩传感器10、压力传感器11、直线位移传感器13和角位移传感器14分别通过数据采集卡与pc机通讯连接，所述的挤压加载电机1和剪切加载电机6分别通过驱动器与pc机控制连接。The torque sensor 10, the pressure sensor 11, the linear displacement sensor 13 and the angular displacement sensor 14 are connected to the pc through the data acquisition card respectively, and the extrusion loading motor 1 and the shearing loading motor 6 are connected to the pc through the driver respectively. machine control connection.
本实验装置的工作原理是：通过挤压加载电机1的驱动，使上平行盘8上下移动实现对放置在上、下平行盘之间的被测材料试样的挤压；通过剪切加载电机6的驱动，使上平行盘8做水平迴转运动实现被测材料试样的剪切，可实现以下材料特性测试。The working principle of this experimental device is: through the driving of the extrusion loading motor 1, the upper parallel disk 8 moves up and down to realize the extrusion of the tested material sample placed between the upper and lower parallel disks; 6 is driven to make the upper parallel disk 8 do a horizontal rotary motion to realize the shearing of the material sample to be tested, which can realize the following material characteristic tests.
一、挤压模式实验：1. Squeeze mode experiment:
a.检测直线位移传感器和压力传感器的工作性能，并提前做好传感器的标定工作；a. Detect the working performance of the linear displacement sensor and the pressure sensor, and do the calibration of the sensor in advance;
b.将被测材料放置在下平行盘上，调整被测材料的姿态；b. Place the material to be tested on the lower parallel plate, and adjust the attitude of the material to be tested;
c.驱动挤压加载电机，调整上平行盘高度使其与被测材料保持接触；c. Drive the extrusion loading motor, adjust the height of the upper parallel plate to keep in contact with the material to be tested;
d.驱动挤压加载电机使上平行盘进一步下降对被测液体进行挤压，可以采用三种不同的激励方式：①以挤压载荷为控制模式，以一定的加载速度对试样进行加载，试样变形量达到预设值时保持一定时间后卸载。②以位移为控制模式，控制主机按照设定程序在短时间内(如5s)挤压试样使其应变达到预设值，其后选取合理的时间步长采集压力传感器信号直至实验结束。③以位移为控制模式，设定控制主机程序使上平行盘以缓慢均匀的加载速度给试样加载一个静位移，以此作为平衡位置施加正弦信号的挤压应变。d. Drive the extrusion loading motor to further lower the upper parallel plate to squeeze the liquid to be tested. Three different excitation methods can be used: ① Use the extrusion load as the control mode to load the sample at a certain loading speed, When the deformation of the sample reaches the preset value, keep it for a certain period of time and then unload it. ②Using displacement as the control mode, the control host squeezes the sample in a short time (such as 5s) according to the set program to make the strain reach the preset value, and then selects a reasonable time step to collect the pressure sensor signal until the end of the experiment. ③Using displacement as the control mode, set the program of the control host so that the upper parallel plate loads a static displacement on the sample at a slow and uniform loading speed, which is used as the equilibrium position to apply the extrusion strain of the sinusoidal signal.
e.观察实验现象并在控制主机上记录直线位移传感器、压力传感器的电信号变化规律，得到相应材料参数的变化规律。e. Observe the experimental phenomenon and record the change law of the electrical signal of the linear displacement sensor and the pressure sensor on the control host to obtain the change law of the corresponding material parameters.
二、剪切模式实验：2. Shear mode experiment:
a.检测直线位移传感器、角位移传感器和扭矩传感器的工作性能，并提前做好传感器的标定工作；a. Detect the working performance of linear displacement sensor, angular displacement sensor and torque sensor, and do a good job of sensor calibration in advance;
b.将被测材料放置在下平行盘上，调整被测材料的姿态，使被测试样的几何中心与上下平行盘的轴线重合；b. Place the tested material on the lower parallel plate, adjust the attitude of the tested material so that the geometric center of the tested sample coincides with the axes of the upper and lower parallel plates;
c.驱动挤压加载电机，调整上平行盘高度使其与被测材料接触并施加一定的预紧力，防止剪切过程中出现材料与壁面滑移。驱动剪切加载电机，可以对上平行盘施加不同的激励信号：①以上平行盘的角位移为控制模式，控制主机按照设定程序在短时间内(如5s)剪切试样使其应变达到预设值，其后选取合理的时间步长采集扭矩传感器信号直至实验结束。②以上平行盘的角位移为控制模式，设定控制主机程序使上平行盘对试样施加一个正弦信号的剪切应变。c. Drive the extrusion loading motor, adjust the height of the upper parallel plate to make it contact with the material to be tested and apply a certain pre-tightening force to prevent the material from slipping with the wall during the shearing process. Drive the shear loading motor to apply different excitation signals to the upper parallel disk: ①The angular displacement of the upper parallel disk is the control mode, and the control host shears the sample in a short time (such as 5s) according to the set program to make the strain reach The preset value, and then select a reasonable time step to collect the torque sensor signal until the end of the experiment. ② The angular displacement of the above parallel disk is the control mode, and the program of the control host is set so that the upper parallel disk applies a shear strain of a sinusoidal signal to the sample.
d.观察实验现象并在控制主机上记录直线位移传感器、扭矩传感器、角位移传感器电信号的变化规律；d. Observe the experimental phenomenon and record the change law of the electrical signals of the linear displacement sensor, torque sensor and angular displacement sensor on the control host;
三、挤压剪切复合模式实验：3. Extrusion and shear composite mode experiment:
a.检测直线位移传感器、压力传感器、角位移传感器和扭矩传感器的工作性能，并提前做好传感器的标定工作；a. Detect the working performance of linear displacement sensors, pressure sensors, angular displacement sensors and torque sensors, and do a good job of sensor calibration in advance;
b.将被测材料放置在下平行盘上，调整被测材料的姿态使被测试样的几何中心与上下平行盘的轴线重合；b. Place the tested material on the lower parallel plate, adjust the attitude of the tested material so that the geometric center of the tested sample coincides with the axes of the upper and lower parallel plates;
c.驱动挤压加载电机，调整上平行盘高度使其与被测材料接触。此时驱动挤压加载电机和剪切加载电机，可以对上平行盘施加不同的挤压和剪切激励的组合信号(如挤压工况和剪切工况实验方法所示)，利用上下平行盘的相对运动使得被测材料产生剪切、挤压变形。c. Drive the extrusion loading motor, adjust the height of the upper parallel disk to make it contact with the material to be tested. At this time, the extrusion loading motor and the shearing loading motor are driven, and different combined signals of extrusion and shear excitation can be applied to the upper parallel disk (as shown in the experimental method of extrusion working condition and shearing working condition). The relative movement of the disk causes shearing and extrusion deformation of the tested material.
d.观察材料受剪切和挤压的实验现象并在控制主机上记录直线位移传感器、扭矩传感器、压力传感器、角位移传感器电信号的变化规律；d. Observe the experimental phenomena of materials being sheared and squeezed, and record the variation rules of the electrical signals of linear displacement sensors, torque sensors, pressure sensors, and angular displacement sensors on the control host;
实施例2Example 2
参照图3、4，在实施例1的结构上增设以下设置，可实现磁流变液、磁流变弹性体等智能材料的材料特性实验。即，包括嵌置在下平行盘9表面上的线性霍尔传感器15和分别套置在上平行盘8、下平行盘9外周的两个分别与直流电源电连接的激磁线圈16，线性霍尔传感器15通过数据采集卡与pc机通讯连接。所述的上、下平行盘由导磁材料制备。Referring to Figures 3 and 4, the following settings are added to the structure of Example 1 to realize material property experiments of smart materials such as magnetorheological fluids and magnetorheological elastomers. That is, it includes a linear Hall sensor 15 embedded on the surface of the lower parallel disk 9 and two excitation coils 16 that are respectively sleeved on the outer circumference of the upper parallel disk 8 and the lower parallel disk 9 and are respectively electrically connected to a DC power supply. The linear Hall sensor 15 communicate with the PC through the data acquisition card. The upper and lower parallel disks are made of magnetically permeable material.
在该结构装置下，通过挤压加载电机1的驱动，使上平行盘8上下移动实现对放置在上、下平行盘之间的被测材料试样的挤压；通过剪切加载电机6的驱动，使上平行盘8做水平迴转运动实现被测材料试样的剪切，同时激励线圈16接入稳定直流电路以产生磁场，使被测材料始终处于相对稳定且垂直于上下平行盘旋转方向的磁场。可实现以下材料特性测试：Under this structural device, through the driving of the extrusion loading motor 1, the upper parallel disk 8 moves up and down to realize the extrusion of the tested material sample placed between the upper and lower parallel disks; through the driving of the shear loading motor 6 Drive to make the upper parallel disk 8 do horizontal rotary motion to realize the shearing of the material sample to be tested. At the same time, the excitation coil 16 is connected to a stable DC circuit to generate a magnetic field, so that the tested material is always relatively stable and rotates perpendicular to the upper and lower parallel disks. direction of the magnetic field. The following material property tests are available:
一、挤压模式实验：1. Squeeze mode experiment:
a.检测直线位移传感器和压力传感器的工作性能，并提前做好传感器的标定工作；a. Detect the working performance of the linear displacement sensor and the pressure sensor, and do the calibration of the sensor in advance;
b.将被测材料放置在下平行盘上，调整被测材料的姿态。加装线圈、线圈支座、支柱。利用直流电源对两个线圈通入同向电流，线圈连接可并联可串联。改变通入线圈的电流大小，实现两平行盘间隙处磁场强度的改变，并通过线性霍尔传感器测量两平行盘间隙内的磁场强度。b. Place the material to be tested on the lower parallel plate, and adjust the attitude of the material to be tested. Add coils, coil supports and pillars. The DC power supply is used to feed the two coils with current in the same direction, and the coils can be connected in parallel or in series. Change the magnitude of the current passed into the coil to realize the change of the magnetic field strength at the gap between the two parallel disks, and measure the magnetic field strength in the gap between the two parallel disks through the linear Hall sensor.
c.驱动挤压加载电机，调整上平行盘高度使其与被测材料保持接触；c. Drive the extrusion loading motor, adjust the height of the upper parallel plate to keep in contact with the material to be tested;
d.驱动挤压加载电机使上平行盘进一步下降对被测液体进行挤压，可以采用三种不同的激励方式：①以挤压载荷为控制模式，以一定的加载速度对试样进行加载，试样变形量达到预设值时保持一定时间后卸载。②以位移为控制模式，控制主机按照设定程序在短时间内(如5s)挤压试样使其应变达到预设值，其后选取合理的时间步长采集压力传感器信号直至实验结束。③以位移为控制模式，设定控制主机程序使上平行盘以缓慢均匀的加载速度给试样加载一个静位移，以此作为平衡位置施加正弦信号的挤压应变。d. Drive the extrusion loading motor to further lower the upper parallel plate to squeeze the liquid to be tested. Three different excitation methods can be used: ① Use the extrusion load as the control mode to load the sample at a certain loading speed, When the deformation of the sample reaches the preset value, keep it for a certain period of time and then unload it. ②Using displacement as the control mode, the control host squeezes the sample in a short time (such as 5s) according to the set program to make the strain reach the preset value, and then selects a reasonable time step to collect the pressure sensor signal until the end of the experiment. ③Using displacement as the control mode, set the program of the control host so that the upper parallel plate loads a static displacement on the sample at a slow and uniform loading speed, which is used as the equilibrium position to apply the extrusion strain of the sinusoidal signal.
e.观察实验现象并在控制主机上记录直线位移传感器、压力传感器的电信号变化规律，得到相应材料参数的变化规律。e. Observe the experimental phenomenon and record the change law of the electrical signal of the linear displacement sensor and the pressure sensor on the control host to obtain the change law of the corresponding material parameters.
二、剪切模式实验：2. Shear mode experiment:
a.检测直线位移传感器、角位移传感器和扭矩传感器的工作性能，并提前做好传感器的标定工作；a. Detect the working performance of linear displacement sensor, angular displacement sensor and torque sensor, and do a good job of sensor calibration in advance;
b.将被测材料放置在下平行盘上，调整被测材料的姿态，使被测试样的几何中心与上下平行盘的轴线重合。利用直流电源对两个线圈通入同向电流，线圈连接可并联可串联。改变通入线圈的电流大小，实现两平行盘间隙处磁场强度的改变，并通过线性霍尔传感器测量两平行盘间隙内的磁场强度。b. Place the material to be tested on the lower parallel disk, and adjust the posture of the material to be tested so that the geometric center of the tested sample coincides with the axes of the upper and lower parallel disks. The DC power supply is used to feed the two coils with current in the same direction, and the coils can be connected in parallel or in series. Change the magnitude of the current passed into the coil to realize the change of the magnetic field strength at the gap between the two parallel disks, and measure the magnetic field strength in the gap between the two parallel disks through a linear Hall sensor.
c.驱动挤压加载电机，根据磁流变材料的粘度特性适当调整上平行盘高度，防止剪切过程中出现材料与壁面滑移。驱动剪切加载电机，可以对上平行盘施加不同的激励信号：①以上平行盘的角位移为控制模式，控制主机按照设定程序在短时间内(如5s)剪切试样使其应变达到预设值，其后选取合理的时间步长采集扭矩传感器信号直至实验结束。②以上平行盘的角位移为控制模式，设定控制主机程序使上平行盘对试样施加一个正弦信号的剪切应变。c. Drive the extrusion loading motor, adjust the height of the upper parallel plate appropriately according to the viscosity characteristics of the magnetorheological material, and prevent the material from slipping with the wall during the shearing process. Drive the shear loading motor to apply different excitation signals to the upper parallel disk: ①The angular displacement of the upper parallel disk is the control mode, and the control host shears the sample in a short time (such as 5s) according to the set program to make the strain reach The preset value, and then select a reasonable time step to collect the torque sensor signal until the end of the experiment. ② The angular displacement of the above parallel disk is the control mode, and the program of the control host is set so that the upper parallel disk applies a shear strain of a sinusoidal signal to the sample.
d.观察实验现象并在控制主机上记录直线位移传感器、扭矩传感器、角位移传感器电信号的变化规律；d. Observe the experimental phenomenon and record the change law of the electrical signals of the linear displacement sensor, torque sensor and angular displacement sensor on the control host;
三、挤压剪切复合模式实验：3. Extrusion and shear composite mode experiment:
a.检测直线位移传感器、压力传感器、角位移传感器和扭矩传感器的工作性能，并提前做好传感器的标定工作；a. Detect the working performance of linear displacement sensors, pressure sensors, angular displacement sensors and torque sensors, and do a good job of sensor calibration in advance;
b.将被测材料放置在下平行盘上，调整被测材料的姿态使被测试样的几何中心与上下平行盘的轴线重合。利用直流电源对两个线圈通入同向电流，线圈连接可并联可串联。改变通入线圈的电流大小，实现两平行盘间隙处磁场强度的改变，并通过线性霍尔传感器测量两平行盘间隙内的磁场强度；b. Place the material to be tested on the lower parallel disk, and adjust the posture of the material to be tested so that the geometric center of the tested sample coincides with the axis of the upper and lower parallel disks. The DC power supply is used to feed the two coils with current in the same direction, and the coils can be connected in parallel or in series. Change the magnitude of the current passed into the coil to realize the change of the magnetic field strength at the gap between the two parallel disks, and measure the magnetic field strength in the gap between the two parallel disks through the linear Hall sensor;
c.驱动挤压加载电机，根据磁流变材料的粘度特性适当调整上平行盘高度，使其与被测材料接触。此时驱动挤压加载电机和剪切加载电机，可以对上平行盘施加不同的挤压和剪切激励的组合信号，利用上下平行盘的相对运动使得被测材料产生剪切、挤压变形；c. Drive the extrusion loading motor, and adjust the height of the upper parallel disk appropriately according to the viscosity characteristics of the magnetorheological material, so that it is in contact with the material to be tested. At this time, by driving the extrusion loading motor and the shear loading motor, different combined signals of extrusion and shear excitation can be applied to the upper parallel disk, and the relative movement of the upper and lower parallel disks can be used to cause shearing and extrusion deformation of the measured material;
d.观察材料受剪切和挤压的实验现象并在控制主机上记录直线位移传感器、扭矩传感器、压力传感器、角位移传感器电信号的变化规律。d. Observe the experimental phenomena of materials being sheared and extruded, and record the changing rules of the electrical signals of the linear displacement sensor, torque sensor, pressure sensor, and angular displacement sensor on the control host.
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