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

Patent metadata

Field	Value
Publication number	US-10444130-B2
Application number	US-201515578843-A
Country	US
Kind code	B2
Filing date	Sep 24, 2015
Priority date	Jul 17, 2015
Publication date	Oct 15, 2019
Grant date	Oct 15, 2019

Abstract

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.

First claim

What is claimed is:

1. A material in-situ test device under multi-load and multi-physical field coupled service conditions, in which a vertical asymmetric arrangement with three columns is adopted, comprising a support frame module, a shock isolation platform, a precise six-degree-of-freedom composite load applying module, a precise torsion module, a clamp and electrothermal coupling module, a digital speckle strain measurement and infrared thermal imaging module, an in-situ observation module, a precise indentation module and a circumferential positioning module,
wherein the precise six-degree-of-freedom composite load applying module is connected to the support frame module by a stationary platform, and tension/compression and bending loads are applied on a test piece by means of the cooperation action of six electric cylinders,
wherein the precise torsion module is provided on a movable platform of the precise six-degree-of-freedom composite load applying module,
wherein the clamp and electrothermal coupling module is connected to the precise torsion module via a flange,
wherein the digital speckle strain measurement and infrared thermal imaging module is provided on the shock isolation platform through an adjustable support base,
wherein the in-situ observation module and the precise indentation module are provided on the circumferential positioning module to realize a rotatable in-situ observation on the test piece.

2. The material in-situ test device under multi-load and multi-physical field coupled service conditions according to claim 1 ,
wherein the precise six-degree-of-freedom composite load applying module comprises a movable platform, a Hooke hinge, a motor, a decelerator, an electric cylinder and a stationary platform,
wherein the stationary platform is fixedly connected to the support frame module,
wherein one end of each electric cylinder is connected to the movable platform through the Hooke hinge and the other end is connected to the stationary platform,
wherein the motor and the decelerator are connected to the stationary platform, respectively, and
wherein under the cooperation action of the six electric cylinders, a flexible movement in six degree of freedom directions is achieved.

3. The material in-situ test device under multi-load and multi-physical field coupled service conditions according to claim 1 ,
wherein a torsional feed in the precise torsion module is provided by a DC servo drive motor and a planetary gear reducer, and a first thrust bearing and a second thrust bearing are mounted on a spline shaft to counteract an axial load generated on the DC servo drive motor and the planetary gear reducer when a tension/compression load is applied; and
wherein the spline shaft transmits the torque to the flange by a spline; the shaft end of the spline shaft is bolted to the flange and transmits the axial tension/compression force.

4. The material in-situ test device under multi-load and multi-physical field coupled service conditions according to claim 1 ,
wherein the clamp and electrothermal coupling module is connected to a six-dimensional force sensor by means of two double end studs,
wherein the test piece is clamped by tightening a pre-load bolt to produce a downward compression force to compress a cover plate and a first baffle, and
wherein the test piece is tightly pressed by means of the friction force via a groove in the clamp that matches the test piece in shape.

5. The material in-situ test device under multi-load and multi-physical field coupled service conditions according to claim 1 ,
wherein the clamp and electrothermal coupling module integrates the clamp with the function of loading the cold, hot and electric multi-physical fields,
wherein the loading of the hot field is achieved by energizing a silicon nitride ceramic heating sheet provided in the clamp in advance to load the heat field,
wherein the loading of the cold field is achieved by replacing the silicon nitride ceramic heating sheet with a Peltier patch and energizing the Peltier patch, thereby realizing the refrigerating, and
wherein the loading of the electric field is achieved by connecting a wire to a cable copper nose and loading a current.

6. The material in-situ test device under multi-load and multi-physical field coupled service conditions according to claim 1 ,
wherein in the digital speckle strain measurement and infrared thermal imaging module, a digital speckle measuring head is provided on the shock isolation platform through an adjustable support base,
wherein an infrared thermal imager is fixed to a support base, and the support base is fixed to the adjustable support base,
wherein the position of the adjustable support base relative to the test piece is adjustable to meet the desired parameter requirements for the operation of the digital speckle measuring head.

7. The material in-situ test device under multi-load and multi-physical field coupled service conditions according to claim 1 ,
wherein the in-situ observation module is entirely fixed to an observation platform, and the observation platform is circumferentially rotated about the test piece,
wherein the observation platform is driven by a servo motor and a speed reducer that drive a roller to rotate, and the roller engages with a circular ring gear to achieve a circumferential feed, and
wherein the whole observation platform is fixed to a slider, thereby realizing a circumferential motion.

8. The material in-situ test device under multi-load and multi-physical field coupled service conditions according to claim 7 ,
wherein the radial and axial rapid feed of the in-situ observation module around the circular ring gear is realized by a stepping motor and a servo motor, respectively,
wherein a microscope is rapidly moved into an observation area, and then the microscope is automatically focused,
wherein after the focus is adjusted as desired, the observation is carried out.

9. The material in-situ test device under multi-load and multi-physical field coupled service conditions according to claim 1 ,
wherein the radial and axial rapid feed of the in-situ observation module around the circular ring gear is realized by a stepping motor and a servo motor, respectively,
wherein a microscope is rapidly moved into an observation area, and then the microscope is automatically focused,
wherein after the focus is adjusted as desired, the observation is carried out.

10. The material in-situ test device under multi-load and multi-physical field coupled service conditions according to claim 1 ,
wherein the precise indentation module is fixed to the circumferential positioning module,
wherein when the precise indentation module operates, the radial and axial rapid feed of the precise indentation module around a circular ring gear is carried out by two ball screw drive units, and
wherein after the positioning is completed, a flexible hinge is driven by means of a piezoelectric ceramic to produce a forward displacement, pressing an indenter into the test piece.

11. A material in-situ testing method under multi-load and multi-physical field coupled service conditions, comprising the following steps:
Step 1: applying a tension/compression load borne by a test piece by means of a precise six-degree-of-freedom composite load applying module, wherein six electric cylinders are driven to elongate or shorten by corresponding motors and corresponding decelerators that are connected to a stationary platform, the load is transferred from a movable platform to a precise torsion module and then from the precise torsion module to a clamp and electrothermal coupling module, thereby applying the tension/compressio

Assignees

• Univ Jilin

Inventors

• Zhao Hongwei
• Zhang Shizhong
• Ren Luquan
• Li Ning
• Dai Xiaohang
• Wang Shunbo
• Huo Zhanwei
• Liu Yang
• Fang Daining
• Pei Yongmao

Classifications

• G01N3/42

  by performing impressions under a steady load by indentors, e.g. sphere, pyramid (G01N3/54 takes precedence) · CPC title

• G01N2203/0641

  using optical, X-ray, ultraviolet, infrared or similar detectors · CPC title

• G01N3/20

  by applying steady bending forces (G01N3/26, G01N3/28 take precedence) · CPC title

• G01N3/22

  by applying steady torsional forces (G01N3/26, G01N3/28 take precedence) · CPC title

• G01N2203/0647

  Image analysis · CPC title