Material in-situ detection device and method under multi-load and multi-physical field coupled service conditions
First Claim
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.
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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.
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Citations
11 Claims
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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.
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11. A material in-situ testing method under multi-load and multi-physical field coupled service conditions, comprising the following steps:
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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/compression load on the test piece;Step 2;
applying a torsion load borne by the test piece by means of the precise torsion module, wherein a DC servo drive motor and a planetary gear reducer drive a spline shaft to rotate, and the spline shaft drives a sensor flange, a flange and a six-dimensional force sensor to rotate, thereby rotating the upper end of a clamp and electrothermal coupling module and applying of the torsion load on the test piece with the lower end of the clamp and electrothermal coupling module being fixed;Step 3;
applying a cantilever bending load borne by the test piece by means of the precise six-degree-of-freedom composite load applying module, wherein the six electric cylinders are driven to elongate or shorten to different extents by the motor and the decelerator that are connected to the stationary platform, the load is transferred from the movable platform to the precise torsion module and then from the precise torsion module to the clamp and electrothermal coupling module, and the trajectory route of the test piece in moving under the action of cantilever bending moment is simulated, thereby applying the cantilever bending load on the test piece;Step 4;
carrying out an indentation test or nondestructive detection of the test piece through a precise indentation module, where in operation, a rapid feed in horizontal and vertical directions is firstly performed by two ball screw drive units, then a first servo motor drives a first screw via a coupling to move a mobile platform to realize the precise feed and finally, a flexible hinge is driven by a piezoelectric ceramic to push a weighing sensor and an indenter forward so as to press the indenter into the test piece, wherein the displacement distance of a baffle is measured by a displacement sensor, and the pressing depth is measured indirectly, and wherein a plurality of types of loads are applied in combination to constitute a multi-load applying mode, and the strain generated in the test piece in the testing process can be obtained through a digital speckle measuring head;Step 5;
loading a hot field on the test piece by applying different operating voltages to a silicon nitride ceramic heating sheet in the clamp and electrothermal coupling module and by heating the test piece to different temperatures in a heat conductive manner, wherein the temperature is measured by an infrared thermal imager;Step 6;
loading a cold field on the test piece by replacing the silicon nitride ceramic heating sheet for heating in loading the hot field with a Peltier patch to refrigerate the test piece to different temperatures, wherein the temperature is measured by the infrared thermal imager;Step 7;
loading an electric field on the test piece in a manner of loading a large current, wherein the electric field is loaded by connecting the wire to a cable copper nose and outputting a large current, and wherein a material performance detection test under the multi-load and multi-physical field test conditions is realized by combining the loading of the multi physical fields and the loading of multi loads.
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Specification