CN102393341A - Device for testing hardness, fracture toughness and residual stress of brittle material with indentation method - Google Patents
Device for testing hardness, fracture toughness and residual stress of brittle material with indentation method Download PDFInfo
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- CN102393341A CN102393341A CN2011102211978A CN201110221197A CN102393341A CN 102393341 A CN102393341 A CN 102393341A CN 2011102211978 A CN2011102211978 A CN 2011102211978A CN 201110221197 A CN201110221197 A CN 201110221197A CN 102393341 A CN102393341 A CN 102393341A
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Abstract
The invention discloses a device for testing the hardness, fracture toughness and residual stress of a brittle material with an indentation method, belonging to the technical field of material property representation. The device comprises a frame and an image acquiring system, wherein the frame is provided with an eye lens, a height-adjustable testing operation platform and an adjusting rotating wheel; a loading system is arranged in the frame, and comprises a fixing support base, a lever, a mandrel, a hanging rod, a middle main shaft and a second motor; and a first motor and the second motor of the loading system are connected with a computer through an I/O (Input/Output) control card. In the invention, the conventional digital image low-load Vickers hardness meter is improved, so that the micro-hardness of a material can be directly tested, and the fracture toughness and residual stress of an interface system of the brittle material and a brittle coating film material can be directly tested; and the device can be widely applied to departments such as industrial enterprises, universities, academies and the like for rapidly detecting relevant indexes.
Description
Technical field
The invention belongs to material property characterization technique field, the device of particularly a kind of hardness of indentation method testing brittle material, fracture toughness and unrelieved stress.What be specifically related to is to pass through the little load Vickers of existing digital picture upgrading, the fracture toughness and the unrelieved stress of direct testing brittle material of the directly microhardness of test material, and ability and brittle coating membraneous material interface system.
Background technology
In new material technology field; The brittle coating membraneous material has the not available power of many base materials, heat, light, electricity, magnetic and chemical property; Microelectronic component, magnetic store, surface coating and prepare composite have been widely used in; In national economy, bring into play irreplaceable vital role, produced huge economic benefit.But; Owing to there is bigger difference in material properties between coating and the substrate; While extraneous factor (like temperature variation, fatigue load, high-temperature oxydation, corrosive medium etc.) in application can influence the bonding properties and the intensity of coating and substrate gradually; Finally cause the pull out type fracture of coating generation unpredictability and lose defencive function, even possibly cause major accident to take place.Therefore, improving the coating material interfacial combined function is one of important method of improving advanced coating material reliability.Wherein, how microhardness, surface/interface fracture toughness and the unrelieved stress of Validity Test and characterizing coating material system have become the key scientific problems that presses for solution in this work.
The experiment test method and apparatus that relates to above-mentioned three material parameters at present has:
Aspect testing material hardness, for example the bright hardness that has proposed a kind of sclerometer test material of Wu Shao mainly comprises: supporting frame; Cavity and coaxial pilot hole (ZL 200420096539.3) are arranged in the supporting frame.People such as Wu Jihua have proposed a kind of hardness detection method; Use the test block of different hardness to carry out the demarcation and the drafting of sclerometer working curve (depth of cup-hardness number curve) through the VB software program during detection earlier; And then workpiece for measurement detected; Through the depth of cup value substitution sclerometer working curve that detection is obtained, thus the hardness number (CN 101893534A) of acquisition workpiece for measurement.
Aspect material fracture toughness, people such as Chen Changqing have reported a kind of fracture toughness measurement method based on optics, through measuring the Young modulus E of test specimen, thickness direction Poisson ratio v
z, Poisson ratio v in the face
XyWith specimen thickness B, with the filming apparatus of optics strain gauge the crack tip near zone is taken pictures, test specimen is carried out fatigue crack prefabrication and loading, stop until the test specimen fracture, carry out numerical operation then, draw the J surface; Further obtain reflecting the K of brittle fracture
ICOr obtain the ductile fracture toughness value, but need crackle be taken pictures continuously (CN 101644646A).People such as distribution spring have reported a kind of method-monolateral angular cut beam method of evaluating ceramic materials fracture toughness.Employing 3 * 4 * 36 or 3 * 4 * 45mm
3The strip sample as specimen, after surface finish, utilize the prefabricated angular cut of method of machining, the width of otch is controlled at below 300 microns, then with the fracture toughness of four-point bending experimental technique test stupalith.But this method needs precrack artificially, brings artificial factor (CN 101210866A) easily.Wu Lihang has reported a kind of material fracture toughness test sample that does not have precrack, is made up of ganoid detected materials sample body and the fragility thin layer known its mechanical performance parameter of one deck, that have the higher elasticity modulus, that can in loading procedure, at first ftracture that is compounded on its smooth surface.But must be by bonding measured material of 502 tackifier and fragility thin layer, the performance of 502 tackifier possibly influence big (CN201196613Y) to test result with the bonding gimmick.
Aspect the unrelieved stress test; Most of researchist mainly considers the unrelieved stress in non-destructive testing or the microlesion test material, for example by means of xrd method (CN 101451965A), impact indentation method (CN1091825A), optical holography interference technique (CN 1415066A) etc.These method of testing specialties require high, and the instrument and equipment cost is high, and some test process is loaded down with trivial details, are unfavorable for factory, business enterprise expand application.
In sum, lack a kind of scientific approach of high-efficient simple and the scientific instrument at a tip at present and test above-mentioned three material parameters simultaneously, this has also greatly limited the quality assurance and the reliability of coating product.Main present situation and reason are: existing detecting instrument function singleness or deficient function need just possibly record the critical material indexs such as microhardness, fracture toughness, unrelieved stress of coating material through too much platform experimental apparatus.And the Instrument purchase cost is high; Maintenance cost and testing expense are also very high; The more important thing is the test process very complicated; The professional background and the analysis ability of having relatively high expectations are unfavorable for factory, business enterprise expand application, and the scientific instruments equipment of therefore needing more superior method of testing of development and coupling badly solves this key technical problem.
Summary of the invention
The objective of the invention is to research and develop into the little load Vickers of a multifunctional all impression appearance through upgrading to the little load Vickers of existing digital picture.This instrument is the microhardness of direct test material not only, and the fracture toughness and the unrelieved stress of direct testing brittle material of ability and brittle coating membraneous material interface system.
The present invention provides a kind of device of hardness, fracture toughness and unrelieved stress of indentation method testing brittle material; It is characterized in that this device comprises frame, eyepiece, liftable test operation platform are set on it and regulate runner; In frame, be provided with loading system; Said loading system comprises hold-down support, lever, push rod, suspension rod, middle main shaft and second motor, wherein
The hold-down support of said loading system links to each other with hold-down support on the frame, is used for fixing an end of lever, and the lever other end is provided with suspension rod; Said suspension rod is made up of a plurality of counterweights; Main shaft in the middle of connecting below near an end of the hold-down support of lever, lever, middle main shaft pass the perforate that is positioned at the rotating disk top and link to each other with Vickers pressing on being arranged at rotating disk, and rotating disk is located at above the liftable test operation platform; Also be provided with object lens on the rotating disk; Rotating disk links to each other with first motor, and first motor is arranged in the frame, is used to control the rotation of rotating disk; Lever is supported by push rod, and push rod links to each other with second motor, and push rod all links to each other with frame with second motor; The weight with counterweight of moving up and down through push rod is applied to load and is positioned at the middle main shaft that is connected on the lever, and this centre main shaft passes the hole that is positioned at the rotating disk top and is applied to the Vickers pressing to power, is used for sample is carried out impression test;
Supporting plate is set under the suspension rod, and supporting plate links to each other with adjusting runner on the frame, regulates the indentation load size by regulating runner;
Said device also comprises image capturing system; Said image capturing system is a CCD video acquisition appearance;
First motor of said loading system links to each other with computing machine through the I/O control card with second motor, and said image capturing system links to each other with computing machine through image pick-up card.
The indentation load of said loading system from 1.0Kgf to the 30.0Kgf scope in grade load.
In order to realize that grade pitch loads; Can load quantity, the size of counterweight through adjusting, and the length of lever realizes that middle main shaft is 5cm to the distance of the hold-down support of lever; Distance between the counterweight hook of middle main shaft suspension suspension rod to the lever is 28cm; The adjacent load level spacing of loading system is 2.0Kgf, as the counterweight of suspension rod add up to 14, the weight of each counterweight is 2.0Kgf.
Said adjusting runner is arranged at the right side, lower end of frame, regulates with convenient.
Said liftable test operation platform comprises that example platform and example platform go up and down to regulate runner, goes up and down to regulate runner by example platform and regulates up-down.Example platform can be the cross platform.
Said computing machine can link to each other with printer.
The present invention also provides a kind of method of hardness, fracture toughness and unrelieved stress of indentation method testing brittle material, and this method step is following:
(1) starter gear, the at first elastic modulus of input measured material in the corresponding indication frame in the analyzing software system of computing machine;
(2) sample is put on the liftable test operation platform, rotates example platform up-down adjusting runner the example platform platform is slowly risen, until from eyepiece, observing specimen surface clearly;
(3) rotating wheel makes indentation load size in the test reach the requirement of setting, and judges from the power value size that the Computer Analysis software systems show whether test macro connects well;
(4) click the startup button in the analyzing software system interface on the computing machine; The Vickers pressing then rotates to the top of sample automatically; Slowly load, protect the program test of carrying, unloading then, after impression test finished, Vickers pressing rotation was automatically withdrawn; Eyepiece can rotate to the sample surface automatically, is convenient to the experimenter and observes and analyze;
(5) in the analysis software interface of computing machine, utilize mouse and acquisition system to test the crack length at the cornerwise length of remaining impression, remaining impression drift angle place, and preserve;
(6) through regulating liftable test operation platform, the impression test second time is prepared to carry out in the surface of moving sample; Regulate runner; Increase or reduce indentation load, repeat above-mentioned the 3rd step, accomplish the impression test more than three times or three times to the 5th step; Require after each EOT, preserve corresponding experimental data respectively;
(7) in the analyzing software system of computing machine, read the experimental data of above-mentioned preservation, then can obtain the fracture toughness and the unrelieved stress at the average microhardness of tested brittle coating material, tested place.
The scheme that the present invention taked is:
1. the hardware loading system of the little load Vickers of existing digital picture is carried out upgrading.The main interior loading system of sclerometer of transforming; And further perforate (hold-down support of the loading system) position of the quantity, size and the lever that load counterweight is adjusted; Thereby the size of adjustment indentation load; Make it to be positioned at 1.0Kgf to 30.0Kgf scope, and adjacent load level spacing is 2.0Kgf, so just realized most of hard brittle materials and brittle coating thin film system are carried out impression fracture test; Both guaranteed to produce the impression crackle, and can not cause measured material thoroughly to be crushed again in tested brittle material surface.Concrete scheme is:
In order to realize that grade pitch loads; We are through changing the length of lever; Middle main shaft is 5cm to the distance of the hold-down support of lever; Distance between the counterweight hook of middle main shaft suspension suspension rod to the lever is 28cm, as the counterweight of suspension rod add up to 14, the weight of each counterweight is 2.0Kgf.
2. the analyzing software system to the little load Vickers of existing digital picture carries out upgrading.On existing sclerometer analysis software basis, we implant scleroscopic analysis software kernel with improved impression fracture mechanics model, expand its analytic function.Concrete test philosophy and process are following:
The micro-hardness testing principle.At first set the size of indentation load P, through the acquisition system collection and be sent in the analysis software of research and development.After accomplishing the impression experiment, utilize acquisition system and analyzing software system to test out two cornerwise length D of remaining impression
1And D
2, calculate the microhardness of measured point then according to following formula:
The fracture toughness of hard brittle material or brittle coating film interface system and unrelieved stress test philosophy.Perhaps look into the elastic modulus E that handbook is confirmed detected materials with other experimental technique earlier, be input in the analyzing software system of research and development.Select for use different load to accomplish impression fracture experiment in various degree then, obtain different impression crack lengths.Test out two cornerwise length D of remaining impression through acquisition system and analyzing software system equally
1And D
2, the crack length C at each remaining impression drift angle place, each maximum load load p.Our improved impression fracture mechanics model of last substitution, calculate measured material in impression cracking process by the stress strength factor K of indentation load with the unrelieved stress generation
IC:
σ wherein
rThe unrelieved stress at place, expression measured point, χ=0.015 (E/H)
1/2, E and H represent the elastic modulus and the hardness of tested single hard brittle material respectively.If the fracture toughness and the unrelieved stress of test brittle coating membraneous material interface compound system then need be revised with following formula:
Wherein, subscript c and the s in the formula (3) representes brittle coating and base material respectively.To obtaining after formula (2) conversion:
So just obtain about C
1/2And P/C
3/2Linear function.Through hard brittle material being carried out the impression fracture test under the different loads condition more than three times or three times, the crack length at the magnitude of load in each experiment, the cornerwise length of remaining impression, remaining impression drift angle place will measured and gather out in system automatically.Then with the load and the crack length data of each experiment test, with (P
1/ C
1 3/2, C
1 1/2), (P
2/ C
2 3/2, C
2 1/2), (P
3/ C
3 3/2, C
3 1/2) ... (P
n/ C
n 3/2, C
n 1/2) form carries out linear fit, unrelieved stress and the fracture toughness of obtaining the measured point respectively from the straight slope that simulates and intercept.The present invention successfully realizes analyzing automatically microhardness, fracture toughness and three important material parameters of unrelieved stress at tested brittle material surface place.
The advantage of apparatus of the present invention is: (1) in the little load Vickers of existing digital picture impression appearance, this device takes the lead in 1.0Kgf to 30.0Kgf scope, realizing multistage special loading technique.(2) this device can directly be tested microhardness, fracture toughness and the unrelieved stress of brittle diaphragm coating material under small scale, has merged various test and scientific instrument in one, greatly reduces Instrument purchase cost, maintenance cost and testing expense.As far as we know, in the little load Vickers of existing digital picture impression appearance, not appearing in the newspapers as yet has the instrument of this kind function.(3) this device can characterize the mechanical property of the hard brittle material and the brittle coating thin film system of high bond strength, high rigidity, the perfect deficiency of existing method of testing.(4) sample preparation is simple, need not artificial precrack, and is easy and simple to handle, analyzes fast, is convenient to apply in research and development department, quality testing mechanism and manufacturing enterprise, can fast and effeciently estimate the q&r of brittle coating material system.
Description of drawings
Fig. 1 is the overall schematic of apparatus of the present invention;
Fig. 2 is the part-structure synoptic diagram of apparatus of the present invention;
Fig. 3 is apparatus of the present invention loading system synoptic diagram;
Optical microscope home position observation picture behind Fig. 4 apparatus of the present invention test heat barrier ceramic coating example interface zone;
The variation relation of Fig. 5 heat barrier ceramic coating fracture toughness test result and times of thermal cycle;
The variation relation of Fig. 6 heat barrier ceramic coating unrelieved stress test result and times of thermal cycle;
Wherein, label among the figure: 1. loading system, 2. image capturing system, 3. image pick-up card, 4. analyzing software system, 5. liftable test operation platform; 6. computing machine, 7. printer, 8.I/O control card, the hold-down support of 11. loading systems, 12. levers, 13. push rods; 14. suspension rod, 15. counterweights, 16. supporting plates, 17. first motors, 18. second motors, 19. rotating disks; 20. middle main shaft, 21.CCD video acquisition appearance, 22. example platforms, 23. example platforms go up and down to regulate runner, 24. indentation load size adjustment runners; 25. the Vickers pressing, 26. eyepieces, 27. object lens, the hold-down support on 28. frames, 30. frames.
Embodiment
Following embodiment can make those skilled in the art more comprehensively understand the present invention, but does not limit the present invention in any way.
The device of a kind of hardness of indentation method testing brittle material, fracture toughness and unrelieved stress is characterized in that, this device comprises frame 30, eyepiece 26, liftable test operation platform 5 is set on it and regulates runner 24, in frame 30, is provided with loading system 1;
Said loading system 1 comprises hold-down support 11, lever 12, push rod 13, suspension rod 14 and second motor 18, wherein,
The hold-down support 11 of said loading system 1 links to each other with hold-down support 28 on the frame 30; An end that is used for fixing lever 12, lever 12 other ends are provided with suspension rod 14, and said suspension rod 14 is made up of a plurality of counterweights 15; Main shaft 20 in the middle of connecting below near an end of the hold-down support 11 of lever 12, lever 12; Middle main shaft 20 passes the perforate that is positioned at rotating disk 19 tops and links to each other with Vickers pressing 25 on being arranged at rotating disk 19, and rotating disk 19 is located at liftable test operation platform 5 tops, also is provided with object lens 27 on the rotating disk 19; Rotating disk 19 links to each other with first motor 17, and first motor 17 is arranged in the frame 30; Lever 12 is supported by push rod 13, and push rod 13 links to each other with second motor 18, and push rod 13 all links to each other with frame 30 with second motor 18; The weight with counterweight 15 of moving up and down through push rod 13 applies load and is positioned at the middle main shaft 20 that is connected on the lever 12, and this centre main shaft 20 passes the hole that is positioned at rotating disk 19 tops and is applied to Vickers pressing 25 to power, is used for sample is carried out impression test;
Supporting plate 16 is set under the suspension rod 14, and supporting plate 16 links to each other with adjusting runner 24 on the frame 30, regulates the indentation loads size by regulating runner 24;
Said device also comprises image capturing system 2; Said image capturing system 2 is a CCD video acquisition appearance 21;
The indentation load of said loading system 1 from 1.0Kgf to the 30.0Kgf scope in grade load.The adjacent load level spacing of loading system is 2.0Kgf.Middle main shaft 20 is 5cm to the distance of the hold-down support 11 of lever; Distance between the counterweight hook of middle main shaft 20 suspension suspension rod 14 to the lever 12 is 28cm; The adjacent load level spacing of loading system is 2.0Kgf; As the counterweight of suspension rod add up to 14, the weight of each counterweight is 2.0Kgf.
Said adjusting runner 24 is arranged at the right side, lower end of frame 30, regulates with convenient.
Said liftable test operation platform 5 comprises that example platform 22 and example platform go up and down to regulate runner 23, goes up and down to regulate runner 23 by example platform and regulates up-down.Example platform 22 is the cross platform.
Said computing machine links to each other with printer 7.
Adopt the microhardness that the device of embodiment 1 can test material, simultaneously can also testing brittle material and the fracture toughness at brittle coating thin film system interface, the unrelieved stress of tested position, the step of specific embodiment is following:
The first step, the preparation sample.Adopt plasma spray coating process, in the high temperature nickel alloy substrate, spray thermal barrier coating ceramic material.The coat system of sample is formed: buffer layer material is the NiCrAIY alloy, and its thickness is about 150 μ m; Ceramic powder material is for containing 8wt%Y
2O
3-ZrO
2, the ceramic layer thickness of spraying is about 350 μ m.In order to consider the influence of high-temperature oxydation, again the part primary sample is carried out high-temperature heat treatment at 1100 ℃ to the thermal barrier coating system interfacial combined function.Then sample is carried out meticulous metallographic and handle, comprise corase grind, fine grinding, polishing, removal work hardening, ultrasonic cleaning supervisor, make the tested sample surface smooth as far as possible, do not have cut, reach test request.
Second step started apparatus of the present invention, at first in the analyzing software system 4 of computing machine, imported the elastic modulus of measured material in the indication frame of correspondence.
The 3rd step; Sample is put on the sample cross platform 22, rotates example platform up-down adjusting runner 23 cross platform 22 is slowly risen, until from eyepiece 26, observing specimen surface clearly; Show the place, focal position that just in time adjusts to object lens, can carry out the impression test of back.
In the 4th step, rotating wheel 24 makes indentation load size in the test reach the requirement of setting, and judges from the power value size that computing machine 6 analysis software 4 show whether test macro connects well.
The 5th step, click the startup button in analyzing software system 4 interfaces on the computing machine 6,25 tops that rotate to sample automatically of Vickers pressing slowly load, protect the program test of carrying, unloading then.After impression test finished, Vickers pressing rotation was automatically withdrawn, and eyepiece 26 can rotate to the sample surface automatically, is convenient to the experimenter and observes and analyze.
The 6th step; In the analysis software interface of computing machine; Utilize mouse and acquisition system to test the crack length at the cornerwise length of remaining impression, remaining impression drift angle place; And click " preservation " this experimental data of crack length at indentation load size, the cornerwise length of remaining impression, remaining impression drift angle place, suppose temporary transient called after testdata1.
In the 7th step, through regulating cross platform 22, the surface of moving sample prepares to carry out the impression test second time then.Regulate runner 24, increase or reduce indentation load, repeat above-mentioned the 3rd step, accomplish the impression test more than three times or three times to the 6th step.Require after each EOT; Preserve corresponding experimental data respectively; Mainly comprise indentation load size, the cornerwise length of remaining impression of each test, the crack length at remaining impression drift angle place; Suppose the temporary transient called after testdata2 of experimental data filename of preservation, testdata3 etc.
The 8th step; In the analyzing software system of computing machine; Read the experimental data base testdata1 of above-mentioned preservation, testdata2, testdata3 etc.; Click " overall treatment " button in the analysis software 4, then can obtain the fracture toughness and the unrelieved stress at the average microhardness of tested brittle coating material, tested place.
Fig. 4, Fig. 5 and Fig. 6 are some representational test results, and sample is the thermal barrier coating sample after the circulation of experience elevated temperature heat.Use apparatus of the present invention and successfully obtained ceramic coat system fracture toughness and unrelieved stress, and analyzed this two relations that parameter changes with times of thermal cycle.
The above; Be merely the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, any technician who is familiar with the present technique field is in the technical scope that the present invention discloses; The variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain of claim.
Claims (10)
1. the device of the hardness of an indentation method testing brittle material, fracture toughness and unrelieved stress; It is characterized in that this device comprises frame (30), eyepiece (26), liftable test operation platform (5) are set on it and regulate runner (24); In frame (30), be provided with loading system (1); Said loading system (1) comprises hold-down support (11), lever (12), push rod (13), suspension rod (14), middle main shaft (20) and second motor (18), wherein
The hold-down support (11) of said loading system (1) links to each other with hold-down support (28) on the frame (30); An end that is used for fixing lever (12); Lever (12) other end is provided with suspension rod (14); Said suspension rod (14) is made up of a plurality of counterweights (15), and main shaft (20) in the middle of the below near an end of the hold-down support (11) of lever (12), lever (12) connects, middle main shaft (20) pass the perforate that is positioned at rotating disk (19) top and link to each other with Vickers pressing (25) on being arranged at rotating disk (19); Rotating disk (19) is located at liftable test operation platform (5) top; Also be provided with object lens (27) on the rotating disk (19), rotating disk (19) links to each other with first motor (17), and first motor (17) is arranged in the frame (30); Lever (12) is supported by push rod (13), and push rod (13) links to each other with second motor (18), and push rod (13) all links to each other with frame (30) with second motor (18); Supporting plate (16) is set under the suspension rod (14), and supporting plate (16) links to each other with adjusting runner (24) on the frame (30);
Said device also comprises image capturing system (2), and said image capturing system (2) is a CCD video acquisition appearance (21).
2. device according to claim 1; It is characterized in that: first motor (17) of said loading system (1) links to each other with computing machine (6) through I/O control card (8) with second motor (18), and said image capturing system (2) links to each other with computing machine (6) through image pick-up card (3).
3. device according to claim 1 is characterized in that: said loading system (1) indentation load from 1.0Kgf to the 30.0Kgf scope in grade load.
4. device according to claim 1 is characterized in that: the adjacent load level spacing of said loading system is 2.0Kgf.
5. device according to claim 1; It is characterized in that: middle main shaft (20) is 5cm to the distance of the hold-down support (11) of lever; The distance that middle main shaft (20) is gone up between the counterweight hook that hangs suspension rod (14) to lever (12) is 28cm; The adjacent load level spacing of loading system is 2.0Kgf, as the counterweight of suspension rod add up to 14, the weight of each counterweight is 2.0Kgf.
6. device according to claim 1 is characterized in that: said adjusting runner (24) is arranged at the right side, lower end of frame (30), regulates with convenient.
7. device according to claim 1; It is characterized in that: said liftable test operation platform (5) comprises that example platform (22) and example platform go up and down to regulate runner (23); Go up and down to regulate runner (23) by example platform and regulate up-down, said example platform (22) is the cross platform.
8. device according to claim 1 is characterized in that: said computing machine links to each other with printer (7).
9. the method for the hardness of an indentation method testing brittle material, fracture toughness and unrelieved stress is characterized in that this method step is following:
(1) starter gear is at first imported the elastic modulus of measured material in the corresponding indication frame in the analyzing software system (4) of computing machine;
(2) sample is put on the liftable test operation platform (5), rotates example platform up-down adjusting runner (23) example platform (22) is slowly risen, until from eyepiece (26), observing specimen surface clearly;
(3) rotating wheel (24) makes indentation load size in the test reach the requirement of setting, and judges from the power value size that computing machine (6) analyzing software system (4) shows whether test macro connects well;
(4) click computing machine (6) and go up the startup button in analyzing software system (4) interface; Vickers pressing (25) then rotates to the top of sample automatically; Slowly load, protect the program test of carrying, unloading then, after impression test finished, Vickers pressing rotation was automatically withdrawn; Eyepiece (26) can rotate to the sample surface automatically, is convenient to the experimenter and observes and analyze;
(5) in the analysis software interface of computing machine, utilize mouse and acquisition system to test the crack length at the cornerwise length of remaining impression, remaining impression drift angle place, and preserve;
(6) through regulating liftable test operation platform (22), the impression test second time is prepared to carry out in the surface of moving sample; Regulate runner (24); Increase or reduce indentation load, repeat above-mentioned the 3rd step, accomplish the impression test more than three times or three times to the 5th step; Require after each EOT, preserve corresponding experimental data respectively;
(7) in the analyzing software system of computing machine, read the experimental data of above-mentioned preservation, then can obtain the fracture toughness and the unrelieved stress at the average microhardness of tested brittle coating material, tested place.
10. method according to claim 9 is characterized in that:
The microhardness of measured point:
Through hard brittle material being carried out the impression fracture test under the different loads condition more than three times or three times; Measure and gather out the crack length at the magnitude of load in each experiment, the cornerwise length of remaining impression, remaining impression drift angle place, then with the load of each experiment test and crack length data with (P/C
3/2, C
1/2) form carry out linear fit, unrelieved stress and the fracture toughness of obtaining the measured point respectively from the straight slope that simulates and intercept; Wherein,
When measured material is single hard brittle material,
Following formula is carried out the appropriate mathematical conversion, obtain following C
1/2And P/C
3/2Linear function,
In the above-mentioned formula, H is the microhardness of measured point, D
1And D
2For two cornerwise length of remaining impression, C are each maximum load load for crack length, the P at each remaining impression drift angle place; K
ICBe the fracture toughness of measured material, σ
rThe unrelieved stress at place, expression measured point, χ=0.015 (E/H)
1/2, E and H represent the elastic modulus and the hardness of tested single hard brittle material respectively; If the fracture toughness and the unrelieved stress of test brittle coating membraneous material interface compound system then need be revised with following formula:
Wherein subscript c and s represent brittle coating and base material respectively.
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Cited By (31)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102809514A (en) * | 2012-07-06 | 2012-12-05 | 中国地质大学（北京） | Method for characterizing toughness of diamond-like carbon thin film |
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| CN102809514B (en) * | 2012-07-06 | 2014-03-26 | 中国地质大学（北京） | Method for characterizing toughness of diamond-like carbon thin film |
| CN102809514A (en) * | 2012-07-06 | 2012-12-05 | 中国地质大学（北京） | Method for characterizing toughness of diamond-like carbon thin film |
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| CN104165815A (en) * | 2014-08-13 | 2014-11-26 | 武汉钢铁(集团)公司 | Method for discriminating punching performance of silicon steel sheet by measuring microhardness |
| CN104165815B (en) * | 2014-08-13 | 2016-05-18 | 武汉钢铁(集团)公司 | A kind of method of differentiating silicon steel punched chip performance by measuring microhardness |
| CN104515721A (en) * | 2014-12-22 | 2015-04-15 | 河海大学 | Device and method for measuring liquid flow-solid conversion mechanism in impact process |
| CN104964890A (en) * | 2015-05-14 | 2015-10-07 | 东莞市中旺精密仪器有限公司 | One-piece terminal application-based hardness detection method |
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| CN106990007A (en) * | 2017-06-07 | 2017-07-28 | 西安科技大学 | Material residual stress and case hardness relation test method and device |
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| CN108844806A (en) * | 2018-05-30 | 2018-11-20 | 中国科学院金属研究所 | A method of estimation metal material plane strain fracture toughness |
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| CN110864987B (en) * | 2019-11-29 | 2022-03-29 | 中国航空工业集团公司北京长城计量测试技术研究所 | Two-section type electromagnetic force application system of high-precision microhardness tester |
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| CN113176158A (en) * | 2021-03-29 | 2021-07-27 | 西安理工大学 | Hardness testing device and method based on scribing method |
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