CN103512814B - Drop weight tear test system and method thereof - Google Patents
Drop weight tear test system and method thereof Download PDFInfo
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- CN103512814B CN103512814B CN201210198414.0A CN201210198414A CN103512814B CN 103512814 B CN103512814 B CN 103512814B CN 201210198414 A CN201210198414 A CN 201210198414A CN 103512814 B CN103512814 B CN 103512814B
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Abstract
The invention discloses a drop weight tear test system and a method thereof, wherein the system comprises a mainframe, a hammering device, a lifting and releasing device and an energy testing and controlling device. The energy testing and controlling device is arranged on the mainframe and the hammering device, for acquiring hammering energy of the hammering device. The hammering device comprises a swing rod, a hammerhead and an impact blade, one end of the swing rod is fixedly connected with a central shaft of the mainframe, the other end is fixedly connected with the hammerhead, the impact blade is fixed on the central position on the internal side of the top of the hammerhead, and a sample anvil block is arranged on a tangential position of a hammerhead movement track. The method comprises: placing a sample on the sample anvil block; once horizontally punching and breaking the sample with the hammerhead from the back side of a sample gap; and testing force-time and displacement-time curves in a punching and breaking process by the energy testing and controlling device, and calculating and displaying drop weight tear energy of the sample. The system and the method implement large-scope measurement of breaking-resistant energy of pipeline steel or a steel pipe, and have advantages of low detection energy consumption, accurate test result and simple test.
Description
Technical field
The present invention relates to metal material experimental technique field, particularly a kind of drop weight tear test system and method thereof.
Background technology
Under the quick growth of alive bound pair energy demand, Oil and Natural Gas Transportation Pipeline construction trends towards adopting the pipe line steel of heavy caliber, high strength and steel pipe to ensure that pipeline military service runs under high pressure conveying, and the Ductile crack growth how controlling pipeline in this case to consider safety factor.Therefore, need the crack growth resistance to material when pipeline Resisting fractre designs, arrest toughness namely carries out Forecast and control.Pipeline crack arrest prediction method normally absorbs energy (CVN) based on Charpy impact, drop weight tearing (DWTT) absorbs energy and Full scale burst experiment.The CVN value test result of pipe line steel and steel pipe is generally not more than 500J, and the DWTT of large scale total wall thickness sample absorbs and can reach more than 40000J.Therefore, CVN test is simple, but the deviation being used for carrying out pipeline break toughness PREDICTIVE CONTROL is larger.Fracture apperance and the Full scale burst experiment fracture apperance of DWTT test are closely similar, Full scale burst experiment can be replaced to predict actual pipeline ductile-brittle transition temperature accurately, thus carry out Fracture Control to pipeline.
General impact testing machine can record the absorption energy of sample, but impact testing machine maximum at present also only has 950J.And traditional DWTT test adopts weight drop mode to be thrust by sample, carried out the ductile-brittle transiton behavior of test material by the shear area evaluating fracture, be difficult to record DWTT and absorb energy.Although improved by equipment and can test DWTT absorption energy, but when the impact tup freely falling body due to this drop hammer tester falls and thrusts sample, except sample fracture absorption portion energy, after impact head and anvil block clash into, dump energy passes to damping spring and beam by anvil block and is absorbed, and therefore tested DWTT absorbs can be very large with actual value deviation.Simultaneously testing sensor is contained on impact head, and test macro is unstable, and easily break down, each survey sensor is all subject to enormous impact, and the oscillographic measurement that causes dropping hammer is made an uproar, and ripple is strong, interference is large, and the data fluctuations obtained is also very large.Therefore, when adopting DWTT to predict the fracture toughness of pipeline, carry out by means of experimental formula.
Pipe-line crack growth rate depends on the Resisting fractre resistance R of material, when adopting DWTT absorption can predict Resisting fractre resistance R,
R=D
p/A
p
D
p=k×t
1.5×C
v 0.544
Here, D
pfor DWTT absorbs energy, unit J
T is thickness of steel pipe (total wall thickness DWTT sample thickness), unit mm
C
vfor the standard summer absorbs energy than sample, unit J
A
pfor the area of fracture under DWTT sample break, unit mm
2
K is notch factor, when adopting precrack notched specimen, and k=3290; When adopting pressing V-shaped notched specimen, k=5930.
As can be seen from above-mentioned formula, can D if directly DWTT can be absorbed
paccurately test out, then utilize DWTT to predict pipeline break toughness, its accuracy will be improved to a great extent.And D
paccurate test is directly closely related with specimen size and notch size and type, but in the standards such as existing API RP 5L3, GB/T 8363, ASTM E436 and SY/T 6476, the dimensional tolerence of DWTT sample is too large, cause test findings accuracy and repeatability poor.
Therefore, a set of new oil-gas transportation pipe line steel and steel pipe Drop-Weight Tear Test (DWTT) device and method thereof is needed.
Summary of the invention
In order to realize the large-range measuring of pipe line steel or steel pipe, reducing it and detecting energy consumption, make test result more accurate, operate easier, embodiments provide a kind of drop weight tear test system and method thereof.Described technical scheme is as follows:
On the one hand, provide a kind of drop weight tear test system, comprising:
Mainframe, comprises base plate, A type frame, sample anvil block, central shaft, support frame, and described support frame and A type frame are individually fixed on described base plate, and central shaft is arranged in described A type frame, and is rotatably connected with described A type frame;
Hammering device, is connected with described A type frame, for carrying out hammering to the sample on described sample anvil block;
Promote and releasing means, be fixed on described mainframe, for described hammering device is promoted to suitable position;
Energy test and control device, be arranged on described A type frame and hammering device, for gathering energy during described hammering device hammering sample;
Described hammering device comprises fork, tup and impact sword, one end of described fork is fixedly connected with the central shaft of described mainframe, its other end is fixedly connected with described tup, described impact sword is fixed on the top center of described tup, and described sample anvil block is positioned at the tangential position of described tup movement locus.Described lifting and releasing means comprise:
Annular double track, it is with the concentricity setting of described central shaft, and described hammering device is arranged between described annular double track, and the periphery of the described annular double track of its hammer action point protrusion;
Supporting guide wheel, respectively arranges four in support frame both sides, and for supporting, lead described annular double track, and each described supporting guide wheel is fixedly connected with described mainframe, and described angle sheave rolls with the inner headed face of described annular double track and is connected;
Driving mechanism, it comprises and is arranged at coupling arrangement on described annular double track and the drive unit for driving described annular double track to rotate, described coupling arrangement is for connecting described tup, and described drive unit is fixed on described mainframe, rotates for driving described annular double track.
Described drive unit comprises motor, gear and tooth bar band, and described tooth bar band is arranged on the periphery of described annular double track, and described tooth bar band is connected with described gears meshing, drives described annular double track to rotate by described motor;
Described coupling arrangement comprises: be fixed on hook, electromagnetic clutch and the contact-making switch on described annular double track, when described contact-making switch touches described tup, described electromagnetic clutch makes it be connected with described tup by promoting described hook, realizes the lifting of tup.
Described system also comprises a brake gear, it is positioned at the side of described annular double track, it comprises: two C type spring leafs, two C type wear plates, brake discs and the hydraulic pump be connected with C type spring leaf described in two, C type spring leaf described in two is set in parallel in the both sides of described annular double track, and be fixedly connected with described mainframe respectively, the C type wear plate described in two is arranged at the inner side of C type spring leaf described in two; Described brake disc is fixed on the two sides of described tup, during brake, by driving hydraulic pump to make C type wear plate described in two hold C type brake disc described in two tightly, forms friction pair.
Described energy test and control device comprise: dial plate, angular encoder, force snesor, photoelectric encoder, data collecting card and data processing and control module;
Described dial plate and angular encoder are fixed on described central shaft, are used for the impact absorbing energy of test sample and the displacement of described tup;
Described force snesor and photoelectric encoder are fixed on described tup, are used for measuring the load of tup and time;
Described data collecting card is connected with described angular encoder, force snesor and photoelectric encoder with control module respectively with data processing, for gathering load signal, time and displacement signal.
Described system also comprises automatic sampling device, it comprises motor, linear guide rail, supply unit and breach centralising device, described supply unit is arranged on described linear guide rail, and drive described supply unit to move along described linear guide rail by described motor, described breach centralising device is arranged at above the side of described linear guide rail, for detecting the centering position of breach;
Described supply unit comprises: sample mount, fixture, detector and pushing block, and described fixture is arranged at the top of described sample mount, for being fixed the sample be positioned in described sample mount; Described detector is for detecting the center of described sample anvil block, and described pushing block is arranged in described sample mount, for the sample in described sample mount is pushed to described sample anvil block.
Described system also comprises residual sample automatic recycling device, it is fixedly connected with described mainframe, it comprises motor, conveying belt and residual sample collecting board, described conveying belt is arranged at the lower end of described residual sample collecting board, described residual sample collecting board is arranged at the side of described annular double track, beats the residual sample of having no progeny for collecting sample.
Described mainframe is also provided with pendulum interlock, and described pendulum interlock is a crossbeam, and it is arranged on described mainframe, for stopping that described tup falls.
On the other hand, provide a kind of Drop-Weight Tear Test (DWTT) method,
The notched specimen of regulation geometric configuration is positioned on the sample anvil block of test unit;
Hammering device is promoted to proper height, makes it fall along vertical circumference, thrust sample from the back side one sub-level of sample break;
Measure sample by energy test and control device and thrusting the power-time in process, displacement-time curve, calculate and demonstrate the drop weight tearing energy of sample.
The size of described notched specimen is long is 305mm ± 5mm, and wide is 76.2mm ± 0.5mm, and thickness is original thickness t or thickness is greater than 19.1mm and is thinned to 19.1mm;
Pressed notch type is v-notch, and angle is 45 ° ± 2 °, and notch depth 5.1mm ± 0.2mm, root radius R is
The beneficial effect that the technical scheme that the embodiment of the present invention provides is brought is:
The present invention adopts macro-energy pendulum to drop hammer and tests the DWTT performance of oil-gas transportation pipe line steel and steel pipe, and measurement range is large, and the DWTT that can test 5000 ~ 50000J sample at-100 DEG C ~ 25 DEG C temperature absorbs energy.
Tup is promoted to suitable hammering positions by lifting and releasing means by the present invention, and the control of energy measurement to hammering sample and tup work is realized by energy test and control device, easy and simple to handle, automaticity is high, tup carries out hammering by level to sample, its hammer systems good stability, and system energy consumption is low, test result is accurate, and the DWTT of test absorbs and can be directly used in the prediction of pipe-line Resisting fractre designed toughness and safety evaluation.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme in the embodiment of the present invention, below the accompanying drawing used required in describing embodiment is briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is test system architecture schematic diagram provided by the present invention;
Fig. 2 is the hammering device structural representation in Fig. 1;
Fig. 3 is the brake device structure schematic diagram in Fig. 1;
Fig. 4 is the automatic sampling device structural representation in Fig. 1;
Fig. 5 is the residual sample automatic recycling device structural representation in Fig. 1;
Fig. 6 is energy test in Fig. 1 and control device principle of work schematic diagram;
Fig. 7 is data processing in Fig. 1 and control module principle of work schematic diagram;
Fig. 8 is the power unit principle of work schematic diagram in Fig. 1;
Fig. 9 is the DWTT specimen size figure that the present invention tests;
Figure 10 is the DWTT force-displacement curve utilizing the present invention to test;
Figure 11 is that the DWTT temperature-absorption utilizing the present invention to test can curve.
In figure:
1 mainframe 5-3-3 detector
1-1 base plate 5-3-4 pushing block
1-2 A type frame 5-4 breach centralising device
1-3 sample anvil block 5-5 safety guard
The residual sample automatic recycling device of 1-4 central shaft 6
1-5 support frame 6-1 motor
The residual sample collecting board of 2 hammering device 6-2
2-1 fork 6-3 side guide plate
2-2 tup 6-4 conveying belt
2-3 impacts sword 6-5 conveyor belt frame
3 promote and releasing means 7 pendulum interlock
3-1 annular double track 8 energy test and control device
3-2 motor 8-1 dial plate
3-3 gear 8-2 angular encoder
3-4 tooth bar band 8-3 force snesor
3-5 links up with 8-4 photoelectric encoder
3-6 electromagnetic clutch 8-5 data collecting card
3-7 contact-making switch 9 data processing and control module
3-8 supporting guide wheel 9-1 intelligent software
4 brake gear 9-2 computers
4-1 C type spring leaf 9-3 control desk
4-2 C type wear plate 10 sample cooling unit
4-3 brake disc 10-1 cooling tank
5 automatic sampling device 10-2 heat eliminating mediums
5-1 motor 11 power unit
5-2 linear guides 11-1 hydraulic pump
5-3 supply unit 1 1-2 air compressor
5-3-1 sample mount 11-3 power supply
5-3-2 fixture
Embodiment
For making the object, technical solutions and advantages of the present invention clearly, below in conjunction with accompanying drawing, embodiment of the present invention is described further in detail.
As shown in Figure 1, pipe line steel provided by the invention and steel pipe macro-energy pendulum Drop-Weight Tear Test (DWTT) device thereof, comprising: mainframe 1, hammering device 2, lifting and releasing means 3, brake gear 4, automatic sampling device 5, residual sample automatic recycling device 6, pendulum interlock 7, energy test and control device 8, data processing and control module 9, sample cooling unit 10, power unit 11.
Described large mainframe 1 is made up of base plate 1-1, A type frame 1-2, sample anvil block 1-3, central shaft 1-4, support frame 1-5, A type frame 1-2 and support frame 1-5 is arranged on base plate 1-1 symmetrically, sample anvil block 1-3 is arranged on base plate 1-1 center, and central shaft 1-4 is arranged on A type frame 1-2 top.
As shown in Figure 2, hammering device 2 is made up of fork 2-1, tup 2-2, impact sword 2-3; One end of fork 2-1 is arranged on A type frame 1-2 by central shaft 1-4, the other end is used for installing tup 2-2, impact sword 2-3 and be arranged on tup 2-2 inside top center, here tup 2-2 is U-shaped, impact sword 2-3 and be positioned at U-shaped groove, when tup is placed in lowest positions, sample and being placed in U-shaped groove.
Described lifting and releasing means 3 comprise:
Annular double track 3-1, itself and the concentricity setting of described central shaft 1-4, described hammering device 2 is arranged between annular double track 3-1, and the periphery of the described annular double track 3-1 of its hammer action point protrusion;
Supporting guide wheel 3-8, four are respectively arranged in the both sides of support frame 1-5, for supporting, lead described annular double track 3-1, and each described supporting guide wheel 3-8 is fixedly connected with described support frame 1-5, and described angle sheave 3-8 rolls with the inner headed face of annular double track 3-1 and is connected;
Driving mechanism, it comprises and is arranged at coupling arrangement on described annular double track 3-1 and the drive unit for driving described annular double track 3-1 to rotate, described coupling arrangement is for connecting tup 2-2, and described drive unit is fixed on described mainframe 1, rotates for driving annular double track.
Drive unit comprises motor 3-2, gear 3-3 and tooth bar band 3-4, and tooth bar band 3-4 is arranged on the periphery of annular double track 3-1, and tooth bar band 3-4 and gear 3-3 is connected with a joggle, and drives annular double track 3-1 to rotate by motor 3-2;
Coupling arrangement comprises: be fixed on the hook 3-5 on annular double track 3-1, electromagnetic clutch 3-6 and contact-making switch 3-7, when described contact-making switch 3-7 touches described tup, described electromagnetic clutch 3-6 makes it be connected with described tup 2-2 by promoting described hook 3-5, realizes lifting and the release of tup 2-2.
When motor 3-2 starts, driven wheel 3-3 rotates, by tooth bar band 3-4, annular double track 3-1 is rotated down leading of angle sheave 3-8, when contact-making switch 3-7 touches yaw 2-2, electromagnetic clutch 3-6 promotes hook 3-5 and tangles hammering device 2, and motor 3-2 is reversed, tup 2-2 is risen to the position that certain height remains on certain angle.
Described brake gear 4 is made up of two C type spring leaf 4-1, two C type wear plate 4-2, brake disc 4-3, and the interior of each C type spring leaf 4-1 then respectively installs a C type wear plate 4-2, and brake disc 4-3 is arranged on tup 2-2 two lateral surface.Hold tup 2-2 tightly by hydraulic pump drive C type spring leaf 4-1 during brake, the swing that can effectively stop tup unnecessary also significantly reduces the consumption of wear plate 4-2 and brake disc 4-3.After hammering device 2 stops, hydraulic pump 11-1 pressure release, C type spring leaf 4-1 resilience is slowly unclamped, and hammering device 2 docks at extreme lower position.
As shown in Figure 4, automatic sampling device 5 is made up of motor 5-1, linear guides 5-2, supply unit 5-3, breach centralising device 5-4, safety guard 5-5.After sample alignment notch centralising device 5-4 is placed on the support 5-3-1 of supply unit 5-3, fixture 5-3-2 compresses sample, under motor 5-1 drives, supply unit 5-3 carries sample along linear guides 5-2, when detector 5-3-3 detects sample arrival sample anvil block 1-3 center, under the transverse direction of pushing block 5-3-4 promotes, sample is pushed on sample anvil block 1-3.
As shown in Figure 5, residual sample automatic recycling device 6 is made up of motor 6-1, residual sample collecting board 6-2, side guide plate 6-3, conveying belt 6-4, conveyor belt frame 6-5.Sample hammer is had no progeny, and collides residual sample collecting board 6-2 and is slipped on conveying belt 6-4, is driven residual sample the automatic recovery by motor 6-1.
Described pendulum interlock 7 is a crossbeam, and it is arranged on support frame 1-5, to ensure the safety of personnel near operator and device.Before changing sample anvil block 1-3 or personnel's maintenance, hammering device 2 is risen to certain altitude, blocks tup with pendulum interlock 7 and prevent from falling, the personal security under protected host frame.
As shown in Figure 6, energy test and control device 8 comprise: angular encoder 8-2, force snesor 8-3, photoelectric encoder 8-4 and data collecting card 8-5 that dial plate 8-1, automatically measuring center axle 1-4 rotate.Dial plate and angular encoder 8-2 are arranged on fork central shaft 1-4, and force snesor 8-3 is arranged on and impacts on sword 2-3, outside photoelectric encoder 8-4 tup 2-2.When impact sword 2-3 hammering sample on tup 2-2, fork 2-1 is with central shaft 1-4 to rotate, thus drives the indicators turn of dial plate 8-1, can directly from the absorption energy in dial plate 8-1 reading sample hammering process.Meanwhile, central shaft 1-4 rotates, and also drives angular encoder 8-2 to rotate, thus can test out the displacement of tup 2-2; Force snesor 8-3 be used for testing tup 2-2 from hammering sample to sample fracture process stressed situation of change; Photoelectric encoder 8-4 is used for testing tup 2-2 from hammering sample to sample fracture process time used.Displacement, power and time signal, by after data collecting card 8-5 acquisition process, send computer 9-2 to, utilize intelligent software 9-1 to carry out analyzing and processing to the power gathered, displacement and time signal, and curve plotting.
As shown in Figure 7, data processing and control module 9 form primarily of intelligent software 9-1, computer 9-2 and control desk 9-3.After in test, the signal of angular encoder 8-2, force snesor 8-3 and photoelectric encoder 8-4 is passed through data collecting card 8-5 process by data collecting card 8-5, input computer 9-2, the power utilizing intelligent software 9-1 to carry out gathering, displacement and time signal carry out analyzing and processing, display and Drawing of Curve; Control desk 9-3 controls lifting and releasing means 3, the automatically work of sampling device 5, pendulum interlock 7 and hydraulic pump 11-1.
Described sample cooling unit 10 is formed primarily of cooling tank 10-1, heat eliminating medium 10-2.Chilling temperature scope is-100 DEG C ~ 25 DEG C.
As shown in Figure 8, power unit 11 mainly comprises: hydraulic pump 11-1, air compressor 11-2, power supply 11-3.Hydraulic pump 11-1 to power lower work at power supply 11-3, for brake gear 4 provides the power needed for brake, makes C type spring leaf 4-1 and C type wear plate 4-2 hold tup 2-2 tightly, tup is stopped.Air compressor 11-2 to power lower work at power supply 11-3, for the fixture 5-3-2 in automatic sampling device 5 and pushing block 5-3-4 provides power, sample is compressed and laterally promotes sample on sample anvil block 1-3.Air compressor 11-2 also provides power for pendulum interlock 7, pendulum interlock 7 is in and opens or carry out protection state.Meanwhile, power supply 11-3 promotes and motor 6-1 in motor 3-2, electromagnetic clutch 3-6 and contact-making switch 3-7, automatically sampling device 5 in releasing means 3 in motor 5-1, residual sample retracting device, and data processing and control module 9 provide working power.
Present invention also offers a kind of Drop-Weight Tear Test (DWTT) method, its method is as described below: be positioned over by the notched specimen of regulation geometric configuration on the sample anvil block of test unit;
Sample is thrust from sample break back side tup one sub-level;
Measure sample by energy test and control device and thrusting the power-time in process, displacement-time curve, calculate and demonstrate the drop weight tearing energy of sample.
As shown in Figure 9, the size of described notched specimen is long is 305mm ± 5mm, and wide is 76.2mm ± 0.5mm, and thickness is original thickness t or thickness is greater than 19.1mm and is thinned to 19.1mm;
Pressed notch type is v-notch, and angle is 45 ° ± 2 °, and notch depth 5.1mm ± 0.2mm, root radius R is
Be 22.0mm, grade of steel X80 pipe line steel DWTT Drop-Weight Tear Test (DWTT) below with thickness be embodiment, be described in further detail the method utilizing apparatus of the present invention to test DWTT energy:
1) sample processing and fabricating: with reference to API RP 5L3, GB/T 8363-2007 and the SY/T 6476-2007 dimensioned DWTT sample by Fig. 4 requirement, and strict notch size precision pressed notch v-notch;
2) sample cooling: be placed in cooling tank by the sample of step (1), sets chilling temperature on request and is incubated a period of time.The present embodiment probe temperature is 0 DEG C ,-40 DEG C ,-60 DEG C, insulation 25min;
3) turn-on data process and control module: open the power supply of apparatus of the present invention, pressurized air, hydraulic pump and data processing and control module, System self-test resets, test sample information in input step (1), (2);
4) pendulum promotes: the tup pressed on control desk promotes button, the motor starting of lifting and releasing means, driven wheel rotates, by engaging with tooth bar band, annular double track is rotated down leading of supporting guide wheel, when contact-making switch touches tup, electromagnetic clutch promotes hook and tangles tup, and motor is reversed, and tup is risen to the position that certain height remains on certain angle.
5) sample centering loading: after the sample alignment notch centralising device of step (1), (2) is placed, press sample presentation button and it is delivered to rapidly on sample anvil block;
6) hammering and data acquisition: press testing and control button, hammering device discharges from holding position, from breach right opposite, the sample of step (1), (2), (3) is once hammered into shape disconnected, energy test and control device and intelligent software are to the data analysis of data collecting card collection and draw the power-time of sample being out of shape, in fracture process, displacement-time curve or force-displacement curve, calculate and show and absorb energy and eigenwert, and can directly read absorption energy from dial plate;
7) residual sample reclaims: by residual sample automatic recycling device, and the residual sample after step (6) being tested sends out from safety cage;
8) fracture evaluation: utilize fracture analysis instrument, carries out evaluation to the fiber cross-sectional rate of the fracture surface of sample of step (6), (7) and calculates;
9) be completed: close proving installation, arrange test data, provide test report.
Figure 10 is the DWTT force-displacement curve utilizing the present invention to test.
Figure 11 is that the DWTT temperature-absorption utilizing the present invention to test can curve.
The invention described above embodiment sequence number, just to describing, does not represent the quality of embodiment.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (9)
1. a drop weight tear test system, comprising:
Mainframe (1), comprise base plate (1-1), A type frame (1-2), sample anvil block (1-3), central shaft (1-4), support frame (1-5), described support frame (1-5) and A type frame (1-2) are individually fixed on described base plate (1-1), central shaft (1-4) is arranged on described A type frame (1-2), and is rotatably connected with described A type frame (1-2);
Hammering device (2), comprise fork (2-1), tup (2-2) and impact sword (2-3), one end of described fork (2-1) is fixedly connected with the central shaft (1-4) of described mainframe (1), its other end is fixedly connected with described tup (2-2), described impact sword (2-3) is fixed on the top center of described tup (2-2), and described sample anvil block (1-3) is positioned at the tangential position of described tup (2-2) movement locus;
Promote and releasing means (3), be fixed on described mainframe (1), for described hammering device (2) is promoted to suitable position;
Energy test and control device (8), be arranged on described A type frame (1-2) and hammering device (2), for gathering energy during described hammering device (2) hammering sample;
It is characterized in that, described lifting and releasing means (3) comprising:
Annular double track (3-1), with described central shaft (1-4) concentricity setting, described hammering device (2) is arranged between described annular double track (3-1), and its hammer action point protrudes the periphery of described annular double track (3-1);
Supporting guide wheel (3-8), support frame (1-5) both sides respectively arrange four symmetrically, for support, described annular double track (3-1) of leading, each described supporting guide wheel (3-8) is fixedly connected with described support frame (1-5), and described angle sheave (3-8) rolls with the inner headed face of described annular double track (3-1) and is connected;
Driving mechanism, it comprises and is arranged at the coupling arrangement on described annular double track (3-1) and the drive unit for driving described annular double track (3-1) to rotate, described coupling arrangement is for connecting described tup (2-2), described drive unit is fixed on described mainframe (1), rotates for driving described annular double track.
2., according to the drop weight tear test system that claim 1 is stated, it is characterized in that,
Described drive unit comprises motor (3-2), gear (3-3) and tooth bar band (3-4), described tooth bar band (3-4) is arranged on the periphery of described annular double track (3-1), described tooth bar band (3-4) and described gear (3-3) are connected with a joggle, and drive described annular double track (3-1) to rotate by described motor (3-2);
Described coupling arrangement comprises: be fixed on the hook (3-5) on described annular double track (3-1), electromagnetic clutch (3-6) and contact-making switch (3-7), when described contact-making switch (3-7) touches described tup, described electromagnetic clutch (3-6) makes it be connected with described tup (2-2) by promoting described hook (3-5), realizes the lifting of tup (2-2).
3., according to the drop weight tear test system of claim 1 or 2, it is characterized in that,
Described system also comprises a brake gear (4), it is positioned at the side of described annular double track (3-1), it comprises: two C type spring leafs (4-1), two C type wear plates (4-2), brake disc (4-3) and the hydraulic pump (11-1) be connected with C type spring leaf (4-1) described in two, C type spring leaf (4-1) described in two is set in parallel in the both sides of described annular double track (3-1), and be fixedly connected with described mainframe (1) respectively, C type wear plate (4-2) described in two is arranged at the inner side of C type spring leaf (4-1) described in two, described brake disc (4-3) is fixed on the two sides of described tup (2-2), during brake, by driving hydraulic pump (11-1) to make C type wear plate (4-2) described in two hold C type brake disc (4-3) described in two tightly, form friction pair.
4., according to the drop weight tear test system that claim 3 is stated, it is characterized in that,
Described energy test and control device (8) comprising: dial plate (8-1), angular encoder (8-2), force snesor (8-3), photoelectric encoder (8-4), data collecting card (8-5) and data processing and control module (9);
Described dial plate (8-1) and angular encoder (8-2) are fixed on described central shaft (1-4), are used for the impact absorbing energy of test sample and the displacement of described tup (2-2);
Described force snesor (8-3) and photoelectric encoder (8-4) are fixed on described tup (2-2), be used for measure tup (2-2) load and the time;
Described data collecting card (8-5) is connected with described angular encoder (8-2), force snesor (8-3) and photoelectric encoder (8-4) with control module (9) respectively with data processing, for gathering load signal, time and displacement signal.
5. the drop weight tear test system according to claim 1 or 2 or 4, is characterized in that,
Described system also comprises automatic sampling device (5), it comprises motor (5-1), linear guide rail (5-2), supply unit (5-3) and breach centralising device (5-4), described supply unit (5-3) is arranged on described linear guide rail (5-2), and drive described supply unit (5-3) mobile along described linear guide rail (5-2) by described motor (5-1), described breach centralising device (5-4) is arranged at the top of the side of described linear guide rail (5-2), for detecting the centering position of breach;
Described supply unit (5-3) comprising: sample mount (5-3-1), fixture (5-3-2), detector (5-3-3) and pushing block (5-3-4), described fixture (5-3-2) is arranged at the top of described sample mount (5-3-1), for being fixed the sample be positioned in described sample mount (5-3-1); Described detector (5-3-3) is for detecting the center of described sample anvil block (1-3), described pushing block (5-3-4) is arranged in described sample mount (5-3-1), for the sample in described sample mount (5-3-1) is pushed to described sample anvil block (1-3).
6. drop weight tear test system according to claim 5, is characterized in that,
Described system also comprises residual sample automatic recycling device (6), it is fixedly connected with described mainframe (1), it comprises motor (6-1), conveying belt (6-4) and residual sample collecting board (6-2), described conveying belt (6-4) is arranged at the lower end of described residual sample collecting board (6-2), described residual sample collecting board (6-2) is arranged at the side of described support frame (1-5), beats the residual sample of having no progeny for collecting sample.
7. drop weight tear test system according to claim 6, is characterized in that,
Described mainframe (1) is also provided with pendulum interlock (7), described pendulum interlock (7) is a crossbeam, it is arranged on described mainframe (1), for stopping that described tup (2-2) falls.
8. a Drop-Weight Tear Test (DWTT) method, is characterized in that:
The notched specimen of regulation geometric configuration is positioned on the sample anvil block of test unit;
Hammering device is promoted to proper height, and press testing and control button, hammering device discharges from holding position, and hammering device track is circumferentially fallen, and the impact sword on tup thrusts sample from the back side one sub-level of sample break;
Measure sample by energy test and control device and thrusting the power-time in process, displacement-time curve, calculate and demonstrate the drop weight tearing energy of sample.
9. Drop-Weight Tear Test (DWTT) method according to claim 8, is characterized in that,
The size of described notched specimen is long is 305mm ± 5mm, and wide is 76.2mm ± 0.5mm, and thickness is original thickness t or thickness is greater than 19.1mm and is thinned to 19.1mm;
Pressed notch type is v-notch, and angle is 45 ° ± 2 °, and notch depth 5.1mm ± 0.2mm, root radius R is
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