CN102374953A - Indentation device for testing load-displacement curve of material - Google Patents
Indentation device for testing load-displacement curve of material Download PDFInfo
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- CN102374953A CN102374953A CN2010102585134A CN201010258513A CN102374953A CN 102374953 A CN102374953 A CN 102374953A CN 2010102585134 A CN2010102585134 A CN 2010102585134A CN 201010258513 A CN201010258513 A CN 201010258513A CN 102374953 A CN102374953 A CN 102374953A
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Abstract
The invention relates to a device for testing mechanical properties of a material, in particular to an indentation device for testing a load-displacement curve of the material. The indentation device comprises a mechanical part and an electrical control part, wherein the mechanical part is connected with the electrical control part through a data transmission line; the mechanical part consists of a positioning device and an indentation making device; in the indentation making device, a pressure head is driven to move up and down through a two phase mixed linear step motor, and the pressure head is a diamond material spherical pressure head with the diameter of not less than 1mm; and the electrical control part comprises a programmable controller, a touch screen and a motor driver, and is used for driving the step motor of the mechanical part and acquiring data measured by the mechanical part to realize man-machine interaction. The device is a nondestructive testing device, and has the characteristics of simple structure, small volume, light weight, high detection accuracy, portability in a testing field and the like.
Description
Technical field
The present invention relates to the device of material mechanical performance test, be specially a kind of impression device of measuring metal material load-displacement curve.
Background technology
Measuring metal material conventional mechanical property (like elastic modulus, work hardening index, yield strength, tensile strength, hardness etc.) at present comprises direct and indirect method two big classes; Relate to multiple material different performance test or estimation type in these two big class methods again, visible Fig. 7 of metal material mechanics method for testing performance in the prior art field.
In Fig. 7 method, noticeable with the indicating value indentation of harmless type especially, it in real time test material surface property and need not to destroy the virgin state of structure.To detect nano-hardness tester appearance morning that coating and hard brittle material are master; Yet nano-hardness tester exist environmental requirement high, cost an arm and a leg, shortcoming such as limited use and can not get using widely; In order to overcome the shortcoming that nano-hardness tester exists, the correlative study staff development indentation equipment of millimicro meter level.
The most basic requirement of method of adopting the indicating value indentation to measure material mechanical performance is to obtain P-h curve accurately, promptly can in pressure head is pressed into the process of material, note the change information of the load (power) and the corresponding with it degree of depth (displacement) thereof simultaneously.Occurred polytype this kind equipment at present, volume weight has nothing in common with each other, and purposes is difference to some extent also.
Existing impression device for detecting mechanical property exists bulky usually; Heavy Weight, cost is higher and be not suitable for the popularization of on-the-spot application and industry, and for example device is because it adopts the afterburning mode of cantilevered motor; Measuring object can only be small-sized sample; Perhaps adopt the worm and gear transmission, it only can not write down continually varying load-displacement curve (P-h curve) in the depth capacity and unloading back residual depth measured on the specially prepd small sample under the corresponding pressure.Available technology adopting electromagnetic actuator device or employing solenoid are given the afterburning P-h of acquisition of semi-girder the device of curve in addition, and it can only provide small load and nano-micro level displacement, are not suitable for on-the-spot use.
Summary of the invention
To the deficiency that exists in the prior art, the technical matters that the present invention will solve is to provide a kind of pocket to can be used for the impression device of the on-the-spot mensuration metal material load-displacement curve that detects.
For solving the problems of the technologies described above, technical scheme of the present invention is following:
A kind of impression device of measuring metal material load-displacement curve comprises mechanical part and electric control system, and this mechanical part is connected through data line with this electric control system, it is characterized in that:
Said mechanical part comprises locating device and impression producing device, and wherein locating device is positioned at this mechanical part lower end and is connected through L type web joint with the impression producing device of this mechanical part upper end and fixes;
One end of said impression producing device is provided with pressure head and displacement transducer, and said displacement transducer is close to fixing at vertical direction and said pressure head, is used to measure the displacement size that pressure head is pressed into the measured material surface; The said impression producing device other end is equipped with stepper motor; The leading screw of said stepper motor connects a slide block through a slide block jointing; Said pressure head upper end is fixedly connected a load transducer; It is inner that said load transducer is fixed on said slide block, is used to measure the size of the power that puts on said pressure head;
Said electric control system comprises programmable controller, touch-screen, motor driver; Wherein the output terminal of this programmable controller connects the input end of said motor driver, and said touch-screen is connected and the intercommunication signal through signal wire with said programmable controller; The output terminal of said motor driver is connected with the stepper motor input end of said mechanical part, drives the operation of said stepper motor;
The load transducer of said mechanical part links to each other with the input end of said programmable controller through A/D digital-to-analogue conversion module respectively with displacement transducer, and is inputed in the said programmable controller what survey;
Said stepper motor adopts two-phase hybrid linear type stepper motor.
Said pressure head is that the diameter of diamond is the spherical indenter that is not more than 1mm.
Said locating device is made up of cross slid platform and firm banking; Wherein said cross slid platform has the middle permeable structures of the high-strength aluminium sheet of internal layer, the high-strength aluminium sheet in middle level, outer high-strength aluminium sheet formation; The high-strength aluminium sheet of said skin is connected with said firm banking screw retention; The high-strength aluminium sheet of said internal layer upper surface is provided with two couples of X to the slide unit fastening bolt, and high-strength aluminium sheet upper surface, said middle level is provided with two couples of Y to the slide unit fastening bolt.
Said two couples of Y are used for fixing two Y to the stainless steel traveller to the slide unit fastening bolt, and two couples of X are used for fixing two X to the stainless steel traveller to the slide unit fastening bolt.
Said slide block set is on said stepper motor lower surface evenly distributes four fixing guideposts, and the said slide block of drive that moves up and down of said leading screw slides up and down along said guidepost; It is corresponding with the magnet positions on the said stepper motor bottom plate that wherein said upper end of slide block face edge is equipped with electromagnetic proximity switch.
Said two-phase hybrid linear type stepper motor includes ball screw assembly,, and inner the rotatablely moving of screw of this ball screw assembly, is converted into the rectilinear motion of said leading screw, and the pitch of said ball screw assembly, is 1mm; The employing subdivision driver drives; The minimum step angle is 0.014 °, and feeding resolution is 1 μ m, and stroke is 50mm; Top speed is 10mm/s, and maximum thrust reaches 1600N.
The other fujinon electronic video endoscope that is fixed with of said pressure head, it is 7mm that wherein said fujinon electronic video endoscope adopts diameter, and the maximum field of view angle is 88 °, and enlargement factor is 5 times a photoconduction probe.
Said firm banking adopts Magnetic gauge stand or carrier base.
Said displacement transducer and said load transducer all adopt the linear power supply power supply.
The present invention has following good effect and advantage:
1. the present invention adopts two-phase hybrid linear type stepper motor, directly rotatablely moving of motor is converted into rectilinear motion, have simple in structure, volume is little, lightweight advantage, single portability is to test site;
2. the present invention adopts diameter to be not more than the diamond spherical pressure head of 1mm; Can reach required requirement because the employed pressure of diamond spherical pressure head that adopts is little; Its annex size is corresponding with weight to be reduced, and the depth of cup that is produced realizes the requirement of Non-Destructive Testing less than 100 μ m;
3. the upper surface of cross slid platform of the present invention is provided with eight fastening bolts, can avoid in uninstall process the traveller gap big and cause the error in the measurement;
4. lead screw pair adopts the mode of nut rotation directly to promote the screw mandrel moving linearly in the loading procedure of the present invention, prevents to skid in the loading procedure, reaches specified design pressure.
5. the present invention can select powerful fine setting Magnetic gauge stand or carrier base as firm banking according to measurement environment, can satisfy the requirement that magnetic and nonmagnetic substance are tested, and convenient fixing, and volume is little in light weight, convenient on-the-spot use.
6. the present invention adopts the form (being touch-screen) of man-machine interface that itself and electric control system directly are grouped together, and has avoided the trouble of external computer, is convenient to on-the-spot the use and demonstration in real time.
Description of drawings
Fig. 1 is a structured flowchart of the present invention;
Fig. 2 is a mechanical part positioning device structure synoptic diagram of the present invention;
Fig. 3 is a mechanical part impression producing device structural representation of the present invention;
Fig. 4 is an electrical principle block diagram of the present invention;
Fig. 5 is that touch-screen man machine operation interface of the present invention (a) video adjusting picture, (b) are set picture and (c) test pictures;
Fig. 6 is real-time monitoring picture (a) location picture, (b) testing result of touch-screen man machine operation interface of the present invention;
Fig. 7 is metal material mechanics method for testing performance synoptic diagram in the prior art of the present invention.
Wherein: 101, locating device; 102, L type web joint; 103, impression producing device; 204, touch-screen; 10, cross slid platform; 11, X is to slide unit; 12, Y is to the slide unit fastening bolt; 13, Y is to slide unit; 14, Y is to the slide unit fastening bolt; 15, fastening screw; 16, Y is to the precession handle; 17, X is to the precession handle; 18, firm banking; 21, slide block; 22, near switch; 23, guidepost; 24, motor bottom plate; 25, stepper motor; 26, motor upper mounted plate; 27, fan; 28, leading screw; 29, slide block connector; 30, bedplate; 210, load transducer; 211, displacement transducer; 212, pressure head.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is described in further detail.
Shown in Fig. 1-4, the impression device of measuring metal material load-displacement curve comprises mechanical part 1 and electric control system 2, and this mechanical part 1 and this electric control system 2 are connected through data line.
Mechanical part 1 is the structure of impression producing device 103 and locating device 101 upper and lower settings, and locating device 101 is fixedly connected through L type web joint 102 with impression producing device 103.Impression producing device 103 is fixed on the cross slid platform 10 of locating device 101, and cross slid platform 10 is provided with fastening screw 15, and impression producing device 103 is fixed on the cross slid platform 10 through fastening screw 15 and L type web joint 102.The quantity of fastening screw 15 is 8 in the present embodiment.Impression producing device 103 utilizes locating device 101 location and forms impression on the measured material surface during use; The end that impression producing device 103 contacts with material to be tested is provided with pressure head 212 and displacement transducer 211, and displacement transducer 211 is close to fixing at vertical direction and pressure head 212, and being used to measure pressure head 212, to be pressed into the displacement on measured material surface big or small.Along with moving up and down of pressure head 212, displacement transducer 211 is gathered the depth data that pressure head 212 is pressed into material; Impression producing device 103 has stepper motor 25; This stepper motor 25 connects the motor driver in the electric control system and passes through the motor driver driving; The leading screw 28 of stepper motor 25 connects a slide block 21 through a slide block connector 29, and pressure head 212 upper ends are fixedly connected a load transducer 210, and load transducer 210 is fixed on said slide block 21 inside; Be used to measure the size of the power that puts on said pressure head 212, gather and be applied to the load data on the pressure head 212.
As shown in Figure 2, locating device 101 mainly is made up of cross slid platform 10 and firm banking 18, and wherein locating device 101 is fixed to the detected materials surface through firm banking 18; If detected materials is a magnetic material, then firm banking 18 can adopt Magnetic gauge stand, if detected materials is a nonmagnetic substance; Firm banking 18 can also adopt carrier base to fix; Adopt carrier base then can be pasted on the detected materials surface through Instant cement, present embodiment adopts magnetic force to reach the powerful Magnetic gauge stand of 120kg, Magnetic gauge stand be size 120 * 50 * 55mm; Magnetic gauge stand is two, is mounted on cross slid platform 10 two bottom sides through screw respectively; In the middle of the cross slid platform 10 is penetrating structure, so that the pressure head 212 of impression producing device 103 contacts with the detected materials surface.Cross slid platform 10 is made up of the high-strength aluminium sheet of inner, middle and outer layer; High-strength aluminium sheet material adopts 2219 commercial aluminium coppers; Wherein the high-strength aluminium sheet of internal layer as Y to slide unit 13; To slide unit 11, outer high-strength aluminium sheet and said firm banking 18 are connected through screw retention the high-strength aluminium sheet in middle level as X, and outer high-strength aluminium sheet has two relative sides; Be connected on X passes a side from outer high-strength aluminium sheet to precession handle 17 and the side of the high-strength aluminium sheet of internal layer; But the high-strength aluminium sheet in middle level is not equipped with precession Y to precession handle 16 on the side of the high-strength aluminium sheet of skin parcel, Y to precession handle 16 drive Y to slide unit 13 along two Y to the stainless steel traveller at y to moving, X to precession handle 17 drive X to slide unit 11 along two Y to stainless steel traveller moving in the y direction.Move searching test point to precession handle grip dynamic pressure trace manufacturing installation at x and y direction to precession handle and Y through turning X.Cross slid platform 10 upper surfaces are designed with fastening bolt in the present embodiment; Wherein Y is 4 to slide unit fastening bolt 14 numbers to be installed in Y respectively is to be used for fixing two Y on the high-strength aluminium sheet of internal layer to the stainless steel traveller to slide unit 13; Guarantee that two Y immobilize in the gap between the stainless steel traveller; X is 4 to slide unit fastening bolt 12 numbers and is installed in X respectively on slide unit 11, is used for fixing two X to the stainless steel traveller, guarantees that two X immobilize in the gap between the stainless steel traveller.Fastening bolt pattern set in the embodiment of the invention can prevent the measuring error that cause in the traveller gap in adding uninstall process effectively.The high-strength aluminium sheet in the inside of cross slid platform 10 is provided with fastening screw 15, is used for impression producing device 103 is fixed on cross slid platform 10.
As shown in Figure 3, impression producing device 103 mainly comprises: slide block 21, near switch 22, guidepost 23, motor bottom plate 24, stepper motor 25, motor upper mounted plate 26, fan 27, leading screw 28, slide block connector 29, bedplate 30, load transducer 210, displacement transducer 211, pressure head 212 etc., and impression producing device 103 drives moving up and down of pressure heads 212 by stepper motor 25; Stepper motor 25 adopts two-phase hybrid linear type stepper motor in the present embodiment; This stepper motor 25 includes ball screw assembly,, and inner the rotatablely moving of screw of this ball screw assembly, is converted into the rectilinear motion of said leading screw 28, the inward turning screw pair of built-in pitch 1mm in the present embodiment; The minimum step angle is 0.014 °; Feeding resolution is 1 μ m, and stroke is 50mm, and top speed is 10mm/s; Maximum thrust reaches 1600N; This stepper motor 25 has the 2NM moment of torsion, and the step actuator of stepper motor 25 adopts subdivision driver in the present embodiment, and four corners of the motor bottom plate 24 of the lower end of stepper motor 25 are fixed with guidepost 23 through nut respectively; The other end of guidepost 23 is connected on four corners of shape size and motor bottom plate 24 corresponding bedplates 30; This bedplate 30 is middle permeable structures, is convenient to passing through of pressure head 212 and displacement transducer 211, and guidepost 23 is with a slide block 21; The upper surface of this slide block 21 29 is connected with leading screw 28 through being slidingly connected; Along with moving up and down of leading screw 28 slides up and down along guidepost 23, load transducer 210 is between upper end, slide block connector 29 and the pressure head 212 of pressure head 212, and load transducer 210 is connected fixing with the upper end of pressure head 212 through screw thread; Load transducer 210 is positioned at slide block 21 inside, is fixed together with slide block 21, and load transducer 210 is gathered and is applied to the load data on the pressure head 212.Load transducer 210 adopts the dish-type load transducer in the present embodiment, and it is small and exquisite to have structure, highly low; The anti-bias load performance is good, all steel material, crest 200Kg; Nonlinearity≤± 0.03; Resolution 10g, pressure head 212 employing diameters are the spherical indenter of the adamas material of 0.5mm in the present embodiment, press deeply less than 100 μ m.Slide block 21 upper surface edges be equipped with protrude in slide block 21 upper surfaces electromagnetic type near switch 22, this is corresponding near the magnet positions on the motor bottom plate 24 of switch 22 and stepper motor 25.Slide block 21 in the impression producing device 103 is along with leading screw 28 moves up and down; Be provided with on it near switch 22 as safety practice; Prevent to move upward in pressure head 212 uninstall process always; Promptly when approaching to the 2mm scope near the magnet on switch 22 and the motor bottom plate 24, power supply breaks off voluntarily, and leading screw 28 stops to move upward at once.Fujinon electronic video endoscope can adopt the hand-held electronic endoscope; Also can be fixed near the pressure head 212; Fujinon electronic video endoscope employing diameter is 7mm in the present embodiment, and the maximum field of view angle is 88 °, and enlargement factor is 5 times a photoconduction probe; It is other that the fujinon electronic video endoscope of hand-held can directly be placed on pressure head 212, connects the input end of touch-screen 204 through signal wire.Displacement transducer 211 adopts resilience type LVDT displacement transducers in the present embodiment, have precision height, error little, move advantages such as happy and level and smooth, maximum range 5mm, synthesis precision 0.05%.Fujinon electronic video endoscope is close to all the time and is fixed on pressure head 212 next doors during use.On the another side of the motor upper mounted plate 26 of stepper motor 25 fan 27 is installed also, prevents that motor overheating and sensor from producing temperature and floating.
In order to realize the requirement of the present invention, electrical principle block diagram as shown in Figure 4 to the electrical control aspect.Weave preset program in the programmable controller; The preset program of being worked out in the embodiment of the invention is the program of trapezoid figure language programming establishment, comprising: analog quantity input, analog quantity demarcation, manual mode pulse output, velocity process, curve display processing, data acquisition, data processing, zero point correction and automatic mode.Through touch-screen 204 input parameter in the programmable controller; The control programmable controller is given motor driver according to the pulse signal that setpoint frequency sends; This motor driver provides the current drives stepper motor 25 actions according to the pulse signal instruction, makes stepper motor 25 with certain rotational speed, through the conversion of stepper motor 25 inside; Stepper motor 25 drives leading screw 28 and drives pressure head 212 along the motor shaft moving linearly with certain speed, reaches the purpose that material surface is added unloading.In pressure head 212 rectilinear motion processes, record the size of the power that puts on pressure head 212 and displacement size that pressure head 212 is pressed into material surface through load transducer 210 and displacement transducer 211.What recorded by load transducer 210 and displacement transducer 211 is simulating signal, inputs in the programmable controller through analog to digital conversion (A/D).Be positioned near the fujinon electronic video endoscope the pressure head 212, connect the input end of touch-screen 204 through signal wire.Fujinon electronic video endoscope reaches the man-machine interface in the touch-screen 204 with the image at tested position during work, and the operator can pass through this man-machine interface observation test object.Be connected with signal wire between touch-screen 204 and the programmable controller, can realize and programmable controller between the mutual transmission of information.
As shown in Figure 5, according to the test request of the present invention to material, the man-machine interface operation screen of touch-screen 204 mainly comprises the video adjusting picture, sets picture, test pictures in the present embodiment.Write supplemental characteristic through the button on the man-machine interface operation screen of touch-screen and input to 25 operations of programmable controller operation stepper motor.The present invention can be provided with load pulses frequency, unloading pulsed frequency, driver segmentation number, load bound, displacement bound, pressure set points, displacement setting value etc. through the man-machine interface of touch-screen 204; These setting values can be sent to programmable controller, and can be kept in the entrained CF card of touch-screen 204.
The present invention is when the mechanical property on test material surface; At first detected materials is carried out surface treatment; Polishing or electropolishing are selected firm banking according to the character of material, and with mechanical part 1 with the detected materials Primary Location and be fixed on institute and survey regional; Drive impression producing device 103 with X to precession handle 17 to precession handle 16 through the Y that turns the cross slid platform 10 on the locating device 101 and move the searching test point in y, x direction; Cooperate fujinon electronic video endoscope and man-machine interface picture observation test object, regulate the location situation of pressure head 212, realize location measured material microcell position such as welding joint heat-affected zone.Location picture shown in Fig. 6 (a) can be realized monitoring in real time to the location picture.Through the required parameter of man-machine interface operation screen input; And reach in the programmable controller and be kept in the CF card through touch-screen 204; The running of programmable controller controls motor driver drive stepping motor 25; Stepper motor 25 drives pressure head 212 along the motor shaft moving linearly through leading screw 28, realizes material surface is added unloading.In pressure head rectilinear motion process; Record the size of the power that puts on pressure head 28 and displacement size that pressure head 28 is pressed into material surface through load transducer 210 and displacement transducer 211, and export in the CF card that touch-screen 204 carries through programmable controller.Test result can show in the man-machine interface of touch-screen 204 that Fig. 6 (b) is a kind of testing result figure.After measurement finishes; Data in the CF card are exported in the mechanical property software for calculation handle; Obtain the mechanical property of material microcell; Employing Delphi 7.0 software programming mechanical property software for calculation in the present embodiment just can be handled load, displacement data to software for calculation storing the data importing that stores in the card CF card, thereby draw the mechanical property of material microcell.
The present invention adopts minor diameter diamond spherical indenter, can produce material surface hardly and destroy, and can regard Non-Destructive Testing as.Mechanical part size of the present invention is little, in light weight, and single just portability is to test site.Can test the materials with different properties surveyed area through adopting different fixed base form.Through selecting suitable computing method, can test out indentation hardness, elastic modulus, yield strength, tensile strength, strain hardening exponent of material etc.Can operate easily, obtain desirable P-h curve, but continuous coverage, and the whole operation process is no more than 2min.Be applicable to that in-site measurement uses.
Claims (10)
1. an impression device of measuring metal material load-displacement curve comprises mechanical part and electric control system, and this mechanical part is connected through data line with this electric control system, it is characterized in that:
Said mechanical part is the upper and lower structure that is provided with of impression producing device and locating device, and locating device is connected fixing with impression producing device through L type web joint;
One end of said impression producing device is provided with pressure head and displacement transducer, and said displacement transducer is close to fixing at vertical direction and said pressure head, is used to measure the displacement size that pressure head is pressed into the measured material surface; The said impression producing device other end is equipped with stepper motor; The leading screw of said stepper motor connects a slide block through a slide block jointing; Said pressure head upper end is fixedly connected a load transducer; It is inner that said load transducer is fixed on said slide block, is used to measure the size of the power that puts on said pressure head;
Said electric control system comprises programmable controller, touch-screen, motor driver; Wherein the output terminal of this programmable controller connects the input end of said motor driver, and said touch-screen is connected and the intercommunication signal through signal wire with said programmable controller; The output terminal of said motor driver is connected with the stepper motor input end of said mechanical part, drives the operation of said stepper motor;
The load transducer of said mechanical part links to each other with the input end of said programmable controller through A/D digital-to-analogue conversion module respectively with displacement transducer, and the data of being surveyed are inputed in the said programmable controller.
2. by the impression device of the described mensuration metal material of claim 1 load-displacement curve, it is characterized in that said stepper motor adopts two-phase hybrid linear type stepper motor.
3. by the impression device of the described mensuration metal material of claim 1 load-displacement curve, it is characterized in that said pressure head is that the diameter of diamond is the spherical indenter that is not more than 1mm.
4. press the impression device of the described mensuration metal material of claim 1 load-displacement curve; It is characterized in that said locating device comprises cross slid platform and firm banking; Wherein said cross slid platform is the middle permeable structures with the high-strength aluminium sheet of internal layer, the high-strength aluminium sheet in middle level, outer high-strength aluminium sheet formation; The high-strength aluminium sheet of said skin is fixedly connected with said firm banking; The high-strength aluminium sheet of said internal layer upper surface is provided with two couples of X to the slide unit fastening bolt, and high-strength aluminium sheet upper surface, said middle level is provided with two couples of Y to the slide unit fastening bolt.
5. by the impression device of the described mensuration metal material of claim 4 load-displacement curve, it is characterized in that two couples of Y are used for fixing two Y to the stainless steel traveller to the slide unit fastening bolt, two couples of X are used for fixing two X to the stainless steel traveller to the slide unit fastening bolt.
6. press the impression device of the described mensuration metal material of claim 1 load-displacement curve; It is characterized in that said slide block set on said stepper motor lower surface evenly distributes fixing guidepost, the said slide block of drive that moves up and down of said leading screw slides up and down along said guidepost; Wherein said upper end of slide block face edge is equipped with electromagnetic proximity switch, and electromagnetic proximity switch is corresponding with the magnet positions on the said stepper motor bottom plate.
7. by the impression device of the described mensuration metal material of claim 2 load-displacement curve, it is characterized in that said two-phase hybrid linear type stepper motor includes ball screw assembly,, inner the rotatablely moving of screw of this ball screw assembly, is converted into the rectilinear motion of said leading screw; The pitch of said ball screw assembly, is 1mm, adopts subdivision driver to drive, and the minimum step angle is 0.014 °; Feeding resolution is 1 μ m; Stroke is 50mm, and top speed is 10mm/s, and maximum thrust reaches 1600N.
8. press the impression device of the described mensuration metal material of claim 1 load-displacement curve; It is characterized in that the other fujinon electronic video endoscope that is fixed with of said pressure head; It is 7mm that wherein said fujinon electronic video endoscope adopts diameter, and the maximum field of view angle is 88 °, and enlargement factor is 5 times a photoconduction probe.
9. by the impression device of the described mensuration metal material of claim 4 load-displacement curve, it is characterized in that said firm banking adopts Magnetic gauge stand or carrier base.
10. by the impression device of the described mensuration metal material of claim 1 load-displacement curve, it is characterized in that said displacement transducer and said load transducer all adopt the linear power supply power supply.
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| CN2010102585134A CN102374953A (en) | 2010-08-20 | 2010-08-20 | Indentation device for testing load-displacement curve of material |
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| CN2010102585134A CN102374953A (en) | 2010-08-20 | 2010-08-20 | Indentation device for testing load-displacement curve of material |
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