NL2026662A - Cross dual tensile comprehensive test platform and method suitable for high-temperature conditions - Google Patents
Cross dual tensile comprehensive test platform and method suitable for high-temperature conditions Download PDFInfo
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- NL2026662A NL2026662A NL2026662A NL2026662A NL2026662A NL 2026662 A NL2026662 A NL 2026662A NL 2026662 A NL2026662 A NL 2026662A NL 2026662 A NL2026662 A NL 2026662A NL 2026662 A NL2026662 A NL 2026662A
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- 238000012360 testing method Methods 0.000 title claims abstract description 86
- 238000000034 method Methods 0.000 title claims abstract description 21
- 230000009977 dual effect Effects 0.000 title description 6
- 238000009864 tensile test Methods 0.000 claims abstract description 22
- 238000003825 pressing Methods 0.000 claims description 25
- 238000005259 measurement Methods 0.000 claims description 16
- 230000003647 oxidation Effects 0.000 claims description 3
- 238000007254 oxidation reaction Methods 0.000 claims description 3
- 239000003973 paint Substances 0.000 claims description 3
- 239000007921 spray Substances 0.000 claims description 3
- 238000005485 electric heating Methods 0.000 abstract description 11
- 238000010438 heat treatment Methods 0.000 abstract description 11
- 238000012986 modification Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 238000005096 rolling process Methods 0.000 description 4
- 238000012512 characterization method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000006073 displacement reaction Methods 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 2
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- 230000009286 beneficial effect Effects 0.000 description 1
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- 239000011810 insulating material Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
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- 230000000149 penetrating effect Effects 0.000 description 1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/18—Performing tests at high or low temperatures
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
- G01N3/04—Chucks
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0017—Tensile
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/0069—Fatigue, creep, strain-stress relations or elastic constants
- G01N2203/0075—Strain-stress relations or elastic constants
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/022—Environment of the test
- G01N2203/0222—Temperature
- G01N2203/0226—High temperature; Heating means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/026—Specifications of the specimen
- G01N2203/0262—Shape of the specimen
- G01N2203/0272—Cruciform specimens
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/0641—Indicating or recording means; Sensing means using optical, X-ray, ultraviolet, infrared or similar detectors
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/067—Parameter measured for estimating the property
- G01N2203/0676—Force, weight, load, energy, speed or acceleration
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/067—Parameter measured for estimating the property
- G01N2203/0682—Spatial dimension, e.g. length, area, angle
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/067—Parameter measured for estimating the property
- G01N2203/0694—Temperature
Abstract
The invention provides a cruciform tensile comprehensive test platform and method 5 suitable for high-temperatures. The test platform comprises electric heating temperature control system, stretching control system and strain measuring system; the stretching control system comprises tester, two-way cross stretching device, scale grating and force sensor, the tester is connected to the two-way cross stretching device to apply pressure thereto, the two-way cross stretching device clamps and stretches a 10 test piece, the scale grating and the force sensor reads the stretched length and force value of the piece, the heating temperature control system sets the surrounding temperature of the stretching control system, the strain measuring system comprises measuring head and processor connected to each other, the measuring head comprises a camera for capturing images of a stretching process, and the processor obtains a 15 strain value of the test piece during the tensile test at a set temperature according to the image.
Description
CRUCIFORM TENSILE COMPREHENSIVE TEST PLATFORM AND METHOD SUITABLE FOR HIGH-TEMPERATURE CONDITIONS Field of the Invention The present invention belongs to the field of characterization and test of mechanical properties and forming properties of metal plates, and specifically relates to a cruciform tensile comprehensive test platform and method suitable for high-temperature conditions.
Background of the Invention The statement of this section merely provides background art information related to the present invention, and does not necessarily constitute the prior art. Cruciform tension can obtain the mechanical properties, yield criteria and forming limits of a plate under equal dual tension and different strain paths, while the mechanical properties of the plate at different temperatures under equal dual tension and different strain paths, yield criteria and forming limits are particularly important for guiding the forming process of the plate. The inventors have developed a biaxial cross tensile test device (application number
201710187880.1), which solves the problems that the stretching ratio of the existing mechanical stretching device is limited and the mechanical properties of a material under different stretches cannot be comprehensively tested, and provides certain help for tensile test at different temperatures. However, as the inventors know, the existing platforms that can test the two-way cross tensile properties of metals at different temperatures are generally composed of a hydraulic or mechanical two-way stretching device and a heating furnace. When tensile tests of different temperatures are performed in the heating furnace, the non-contact strain measurement technology (i.e., DIC technology) cannot be applied well due to the refraction of light by high-temperature air in the closed furnace and glass, which affects the test precision,
cannot obtain accurate mechanical properties and forming properties of the plate, and cannot provide an accurate data basis for the forming of the plate.
Summary of the Invention
In order to solve the above problems, the present invention proposes a cruciform tensile comprehensive test platform and method suitable for high-temperature conditions, which can accurately test the mechanical properties, yield criteria and forming properties of a plate at high temperatures (up to 500°C) under equal dual tension and different loading ratios.
According to some embodiments, the present invention adopts the following technical solutions: A cruciform tensile comprehensive test platform suitable for high-temperature conditions includes an electric heating temperature control system, a stretching control system and a strain measuring system, wherein: the stretching control system includes a tester, a two-way cross stretching device, a scale grating and a force sensor, the tester is connected to the two-way cross stretching device to apply pressure thereto, the two-way cross stretching device is used to clamp and stretch a test piece, and the scale grating and the force sensor are used to read the stretched length and force value of the test piece; the electric heating temperature control system includes a controller, a temperature sensor and an adjustable DC power supply, the adjustable DC power supply is connected to the test piece and enables the test piece to generate Joule heat by means of self-resistance heating to increase the temperature of the test piece, the temperature sensor collects the temperature of the test piece and feeds the temperature back to the controller, and the controller controls the output of the adjustable DC power supply so that the temperature reaches a set value; the strain measuring system includes a measuring head and a processor connected to each other, the measuring head includes a camera for capturing an image of a stretching process, and the processor obtains a strain value of the test piece during the tensile test at a set temperature according to the image.
Through the above solution, the temperature environment can be accurately controlled to create a thermal environment, and strain measurement results are automatically obtained by using the measuring head and the processor, which can overcome the shortcoming that the existing thermal environment cross tensile test platform cannot accurately obtain the strain field of the test piece, and can accurately test the mechanical properties, yield criteria and forming properties of the plate at high temperatures under equal dual tension and different loading ratios.
As an alternative embodiment, the adjustable DC power supply is connected to a clamping component for fixing the test piece through a wire, the clamping component includes an upper clamping piece and a lower clamping piece arranged oppositely, the outsides of the upper clamping piece and the lower clamping piece are insulated and connected with a chuck, the upper clamping piece and the lower clamping piece are further provided with conductive terminals in a penetrating manner, and the terminals are connected with the wire.
As a further limitation, ends of the upper clamping piece and the lower clamping piece are positioned by pins. As a further limitation, the upper clamping piece and the lower clamping piece are respectively connected to the chuck through an insulating layer.
As an alternative embodiment, the two-way cross stretching device includes a cross base, trapezoidal block bases, trapezoidal blocks, a cross pressing assembly, clamping components, tension sensors, a spring, scale gratings and grating reading heads; the cross base is provided with a cross groove, and the trapezoidal block bases are respectively arranged in four sub grooves of the cross groove and slide along the sub grooves of the cross groove; a baffle is vertically arranged on the trapezoidal block base, the trapezoidal block is movably arranged on an inner side of the baftle, the clamping component is fixedly arranged at the end of the trapezoidal block base facing a center point of the cross base, and the tension sensor is arranged between the trapezoidal block base and the clamping component; the cross pressing assembly includes a cross pressing arm and a pressing head, the pressing head is arranged in the center of the cross pressing arm, a bottom surface of the trapezoidal block leans against the baffle, and an inclined surface of the trapezoidal block abuts against a top roller of the cross pressing arm; an inner wall of the cross base is provided with a groove in parallel, the scale grating is arranged in the groove, and the grating reading head corresponding to the scale grating is arranged on the trapezoidal base; the angles between the bottom edges and oblique edges of the trapezoidal blocks are set to be different angles.
As a further limitation, a movable cross-beam of the tester drives the pressing head and the pressing plate of the two-way cross stretching device to press downward; four corners of the pressing plate abut against the oblique edges of the four trapezoidal blocks through rolling bearings, so that the vertical movement of the pressing plate is converted into the horizontal movement of the four trapezoidal blocks; the trapezoidal block is connected to a bottom plate through a guide rail; the clamping component is arranged at one end of each of the four trapezoidal block bases close to the center of the bottom plate, and the force sensor is arranged between the clamping component and the trapezoidal block.
As an alternative embodiment, the strain measuring system is composed of a DIC three-dimensional digital speckle strain gauge, including an adjustable measuring head and a processor; the adjustable measuring head includes a camera, a light source and a bracket; the camera and the light source are arranged on the bracket, and the distance between the bracket and the clamping component is adjustable.
As an alternative embodiment, the controller controls the output of the adjustable DC power supply by using a PID control method.
As an alternative embodiment, the controller is further connected with a display and an input module, the display displays the collected temperature value, and the input module collects control instructions of the adjustable DC power supply.
A working method based on the test platform includes: constructing a thermal environment of a set temperature by using the electric heating temperature control system for the tensile test of the test piece, applying pressure to 5 the two-way cross stretching device by the tester in this thermal environment, stretching the test piece by the two-way cross stretching device, capturing an image of the entire stretching process, reading the stretched length and force value of the test piece, and then calculating a strain field of the hot tensile test piece.
As an alternative embodiment, before measurement, the surface of the test piece is sprayed with random speckles by using a high-temperature and oxidation resistant spray paint, the measurement distance between the measuring head and the test piece is adjusted according to the breadth parameters of the camera, and the cross central line of the camera is corrected to ensure the alignment of the measurement image. Compared with the prior art, the beneficial effects of the present invention are: The present invention provides a heating temperature control cross tensile test platform, and the platform can perform accurate heating temperature control on the cross test piece, eliminate the influence of hot gas in a closed space and glass on the non-contact strain measuring system, accurately measure the strain field of the test piece, and record the strain, force and displacement development history of the plate during deformation, which helps the characterization of mechanical properties of the plate at high temperatures and the test of forming properties; and the heating equipment of the platform is not restricted by device structures, which provides convenience for the test operation.
By means of mutual cooperation and linkage of the electric heating temperature control system, the stretching control system and the strain measuring system, the present invention can accurately test the mechanical properties and forming properties of the plate in different temperature environments under dual tension or single tension and different loading ratios, so the test content is more comprehensive, and the test environment is more diverse, flexible and controllable.
Brief Description of the Drawings The accompanying drawings constituting a part of the present invention are used for providing a further understanding of the present invention, and the schematic embodiments of the present invention and the descriptions thereof are used for interpreting the present invention, rather than constituting improper limitations to the present invention, FIG. 1 is a schematic structural diagram of a test platform according to the present invention; FIG. 2 is a schematic diagram of a two-way cross stretching device according to the present invention, FIG. 3 is an enlarged view of a clamping component according to the present invention; FIG. 4 is a schematic structural diagram of a strain measuring system according to the present invention; In which, 1-cross base, 2-trapezoidal block base, 3-trapezoidal block, 4-cross pressing assembly, 4l-cross pressing arm, 42-pressing head, S-clamping component, 50-insulating pin, Sl-insulating layer, 52-terminal, 53-high current-carrying wire, S4-upper clamping piece, 55-test piece, S6-lower clamping piece, 57-chuck, 6-positioning pin, 7-baffle, 8-tension sensor, 9-spring, 10-scale grating, 11-grating reading head, 12-rolling cylinder, 13-laser heater, 14-three-dimensional digital speckle strain gauge, 15-reflector, 16 -triangular ribbed plate, 17-slide baffle.
Detailed Description of the Embodiments The present invention will be further illustrated below in conjunction with the accompanying drawings and embodiments.
It should be noted that the following detailed descriptions are exemplary and are intended to provide further descriptions of the present invention.
All technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical filed to which the present application belongs, unless otherwise indicated.
It should be noted that the terms used here are merely used for describing specific embodiments, but are not intended to limit the exemplary embodiments of the present invention.
As used herein, the singular form is also intended to comprise the plural form unless otherwise indicated in the context.
In addition, it should be understood that when the terms “contain” and/or “comprise” are used in the description, they are intended to indicate the presence of features, steps, operations, devices, components and/or combinations thereof.
In the present invention, the terms such as “upper”, “lower”, “left”, “right”, “front”, “rear”, “vertical”, “horizontal”, “side”, and “bottom” indicate the orientation or positional relationships based on the orientation or positional relationships shown in the drawings, are only relationship terms determined for the convenience of describing the structural relationships of various components or elements of the present invention, but do not specify any component or element in the present invention, and cannot be understood as limitations to the present invention.
In the present invention, the terms such as “fixed” and “connected” should be generally understood, for example, the “connected” may be fixedly connected, detachably connected, integrally connected, directly connected, or indirectly connected by a medium.
For a related scientific research or technical person in this art, the specific meanings of the above terms in the present invention may be determined according to specific circumstances, and cannot be understood as limitations to the present invention.
Embodiment 1: As shown in FIGS. 1-4, a test platform is provided, including an electric heating temperature control system, a stretching control system, and a strain measuring system; the stretching control system includes a tester, a two-way cross stretching device, a scale grating and a force sensor; the tester is connected to the two-way cross stretching device to apply pressure thereto, the two-way cross stretching device is used to clamp and stretch a test piece, and the scale grating and the force sensor are used to read the stretched length and force value of the test piece; The electric heating temperature control system includes a controller, a temperature sensor and an adjustable DC power supply, the adjustable DC power supply is connected to the test piece and enables the test piece to generate Joule heat to increase the temperature of the test piece, the temperature sensor collects the temperature of the test piece and feeds the temperature back to the controller, and the controller controls the output of the adjustable DC power supply so that the temperature reaches a set value; The strain measuring system includes a measuring head and a processor connected to each other, the measuring head includes a camera for capturing an image of a stretching process, and the processor obtains a strain value of the test piece during the tensile test at a set temperature according to the image.
Specifically, in some embodiments, the electric heating temperature control system includes an embedded touch screen, a PLC (Programmable Logic Controller), a temperature sensor and a low-voltage high-current adjustable DC power supply; the PLC includes a CPU (Central Processing Unit) module, a thermocouple signal module, and a power module, wherein the embedded touch screen is connected to the PLC, the temperature sensor collects the temperature of the test piece and feeds the temperature back to the thermocouple signal module of the PLC, the thermocouple signal module is connected to the CPU module, and the power module supplies power to the CPU module and the thermocouple signal module.
The principle of the electric heating temperature control system is that current is introduced into the test piece, and Joule heat is generated by means of the resistance of the metal test piece, thereby increasing the temperature of the test piece.
In this embodiment, the electric heating temperature control system uses the CPU module as a host and expands the thermocouple signal module, and the thermocouple signal module connected to the temperature sensor processes the temperature of the test piece collected by the temperature sensor and transmits the temperature to the CPU.
The specific processing process can use the existing method or circuit, and details are not described herein again.
The CPU compares the collected real-time temperature of the test piece with a target temperature to obtain an error value, obtains a control instruction according to the error value by using a PID control program or algorithm stored in the CPU, processes the control instruction, and outputs a control signal from an output port of the PLC after processing, the control signal is converted into a 0-5 V electrical signal, and the electrical signal is transmitted to the low-voltage high-current adjustable DC power supply in an automatic mode to control the output value of the low-voltage high-current adjustable DC power supply, thereby realizing a heating temperature control function of the platform.
Of course, in some embodiments, the control instruction can be directly input from an embedded touch display screen to artificially or manually control the heating temperature.
In some other embodiments, the electric heating temperature control system is also accompanied by a safety protection system, which can protect the safety of the system In an emergency.
In some embodiments, the stretching control system includes a tester, a two-way cross stretching device, a scale grating, and a force sensor.
The two-way cross stretching device is preferably mechanical, and the two-way cross stretching device provided by the application number 201710187880.1 is available.
As shown in FIG. 2, the two-way cross stretching test device includes a cross base 1, trapezoidal block bases 2, trapezoidal blocks 3, a cross pressing assembly 4, clamping components 5, tension sensors 8, a spring 9, scale gratings 10 and grating reading heads 11. The cross base 1 is provided with a cross groove, so that the cross base 1 forms a cross frame.
The trapezoidal block bases 2 are respectively arranged in sub grooves of the cross groove, and the trapezoidal block bases 2 can slide in the sub grooves.
The trapezoidal block base 2 slides outward from the center of the cross base 1 or slides from the outside to the center of the cross base 1. A baffle 7 is vertically arranged on the trapezoidal block base 2, and the inner side of the baffle 7 faces the center of the cross base 1. The trapezoidal block 3 is placed on the side of the baffle 7 facing the center of the cross base 1, wherein the bottom of the trapezoidal block 3 leans against the baffle 7. A clamping component 5 is arranged at one end of each of the four trapezoidal block bases 2 close to the center of the cross base 1, and a tension sensor 8 is arranged between the clamping component 5 and the trapezoidal block base 2. The tension sensor 8 is fixed to the trapezoidal base 2 by bolt connection, and 1s fixedly connected to the clamping component 5. For other more details, reference may be made to the specification of the application number 201710187880.1, and details are not described herein again.
During use, a top of a pressing head 42 is connected to a movable cross-beam of the commercial tester, and a bottom is connected to the center of a pressing plate 41. By controlling the commercial tester, the movable cross-beam of the commercial tester drives the pressing head 42 and the pressing plate 41 to press down.
Four corners of the pressing plate 41 respectively abut against oblique edges of the four trapezoidal blocks 3 through rolling bearings, so that the vertical movement of the pressing plate 41 is converted into the horizontal movement of the four trapezoidal blocks.
When the pressing plate 41 is pressed down, the four rolling bearings slide along the oblique edges of the trapezoidal blocks 3, the trapezoidal blocks slide outward in the horizontal direction under the thrust of the pressing head 42, the clamping components 5 are driven to stretch the test piece outward, and the force sensors 8 measure the tensile force of the two-way cross stretching test device on the test piece, and the scale gratings 10 measure the displacements of the test piece in two vertical directions.
The trapezoidal block is connected to a bottom plate through a guide rail, a clamping component is arranged at one end of each of the four trapezoidal block bases close to the center of the bottom plate, and a force sensor is arranged between the clamping component and the trapezoidal block.
The scale grating reading head is connected to the trapezoidal block, and the scale grating 1s fixed to the bottom plate.
In these embodiments, the clamping component is specifically shown in FIG. 3, including an upper clamping piece 54, a lower clamping piece 56, terminals 52, a chuck 57, and a high current-carrying wire 53, wherein the test piece 55 is placed between the upper clamping piece 54 and the lower clamping piece 56, fixed by the terminals 52, positioned by two insulating side pins 50, and connected to the high current-carrying wire 53 by the terminals 52; a side surface of the chuck 57 close to the upper clamping piece 54 and the lower clamping piece 56 is coated with an insulating layer material, and the entire clamping component 5 is positioned by insulating pins 50. The chuck 57, the upper clamping piece 54, the lower clamping piece 56, and the test piece 55 are positioned by the insulating pins 50. The surface of the chuck 57 in contact with the upper clamping piece 54 and the lower clamping piece 56 is coated with an insulating layer 51. The insulating material and the insulating layer 51 ensure the safety of test.
The terminals 52 are connected to the high current-carrying wire 53, to fix the upper clamping piece 54, the lower clamping piece 56 and the test piece 55, and both sides are positioned by the pins 50. The chuck 57, the upper clamping piece 54, the lower clamping piece 56, and the test piece 55 are positioned by the insulating pins 50. The insulating layer 51 is on the side of the chuck 57 close to the upper clamping piece 54 and the lower clamping piece 56. Both ends of the upper clamping piece 54 and the lower clamping piece 56 can be positioned by the pins 50. Similarly, the both ends of the upper clamping piece 54 and the lower clamping piece 56 are also provided with terminals 52 to connect the high current-carrying wire 53. The terminals 52 are electrically conductive and penetrate the upper clamping piece 54 and the lower clamping piece 56. In some embodiments, the strain measuring system is a DIC three-dimensional digital speckle strain gauge, including an adjustable measuring head, a control box and a computer, wherein the adjustable measuring head includes a camera, a laser, an LED and a bracket. As shown in FIG. 4, the control box controls the operations of the camera, the laser and the LED, the computer receives the image captured by the camera, and the distance between the bracket and the two-way cross stretching device/ test piece is adjustable.
Before measurement, the surface of the test piece is sprayed with random speckles by using a high-temperature and oxidation resistant spray paint, and then the measurement distance between the adjustable measuring head and the test piece is adjusted according to the breadth parameters of the camera. During measurement, a new project is created on the PC. After the initialization setting of parameters is completed, the cross central line of the camera is corrected to capture an image. After the image is captured, a patch area and seed points are created in a calculation mode, and measurement results are automatically calculated.
The strain measuring system captures a speckle image on the test piece through the camera, matches deformation points on the surface by using a digital image correlation algorithm (DIC), and calculates a strain field of the hot tensile test piece through the changes of three-dimensional coordinates of each point. As an optical non-contact three-dimensional strain measuring system, it has the advantages of rapidness, simplicity, flexibility and high precision, can achieve non-contact measurement and obtain the true strain of the test piece during high-temperature uniaxial tensile test.
Based on the above, the platform can perform accurate heating temperature control on the cross test piece, accurately measure the strain field of the test piece, and record the strain, force and displacement development history of the plate during deformation, which helps the characterization of mechanical properties of the plate at high temperatures and the test of forming properties, and the heating equipment of the platform is not restricted by device structures, which provides convenience for the test operation.
Described above are merely preferred embodiments of the present application, and the present application is not limited thereto. Various modifications and variations may be made to the present application for those skilled in the art.
Any modification, equivalent substitution, improvement or the like made within the spirit and principle of the present application shall fall into the protection scope of the present application.
Although the specific embodiments of the present invention are described above in combination with the accompanying drawing, the protection scope of the present invention is not limited thereto.
It should be understood by those skilled in the art that various modifications or variations could be made by those skilled in the art based on the technical solution of the present invention without any creative effort, and these modifications or variations shall fall into the protection scope of the present invention.
Claims (9)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910989139.6A CN110686982B (en) | 2019-10-17 | 2019-10-17 | Cross double-pull comprehensive test platform and method suitable for high-temperature condition |
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| NL2026662A true NL2026662A (en) | 2021-06-07 |
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| NL2026662A NL2026662A (en) | 2019-10-17 | 2020-10-12 | Cross dual tensile comprehensive test platform and method suitable for high-temperature conditions |
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| CN114115126B (en) * | 2021-11-26 | 2024-05-07 | 苏州航宇九天动力技术有限公司 | In-situ stretching table control system and method |
| CN115096719A (en) * | 2022-07-04 | 2022-09-23 | 西北核技术研究所 | High-temperature bidirectional mechanical property test system and test method |
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| JP4225885B2 (en) * | 2003-12-09 | 2009-02-18 | トヨタ自動車株式会社 | Tensile test equipment |
| CN101975700B (en) * | 2010-11-23 | 2012-07-25 | 中国工程物理研究院总体工程研究所 | Device for high temperature Hopkinson tensile test |
| CN102749253B (en) * | 2012-07-10 | 2015-05-27 | 首钢总公司 | Testing system and method of plate high temperature forming limit diagram |
| CN103267685B (en) * | 2013-05-13 | 2016-02-17 | 北方工业大学 | The auxiliary bidirectional tensile tester of a kind of heat and method |
| CN206362642U (en) * | 2016-12-27 | 2017-07-28 | 吉林大学 | High temperature Dual-shaft synchronous stretching mechanical property tester device |
| CN208568436U (en) * | 2018-01-15 | 2019-03-01 | 管延智 | Hot two-direction pull press mechanics machine |
| CN109163982B (en) * | 2018-09-06 | 2021-06-01 | 北京航星机器制造有限公司 | Thermal environment bidirectional loading test equipment and test method |
-
2019
- 2019-10-17 CN CN201910989139.6A patent/CN110686982B/en active Active
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2020
- 2020-10-12 NL NL2026662A patent/NL2026662A/en unknown
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| Publication number | Publication date |
|---|---|
| CN110686982B (en) | 2021-02-02 |
| CN110686982A (en) | 2020-01-14 |
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