CN1011342B - Rod-type device for measuring performances of feature and fragmenting due to impact - Google Patents
Rod-type device for measuring performances of feature and fragmenting due to impactInfo
- Publication number
- CN1011342B CN1011342B CN 88105010 CN88105010A CN1011342B CN 1011342 B CN1011342 B CN 1011342B CN 88105010 CN88105010 CN 88105010 CN 88105010 A CN88105010 A CN 88105010A CN 1011342 B CN1011342 B CN 1011342B
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- CN
- China
- Prior art keywords
- impact
- rod
- measuring
- test specimen
- millimeter
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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The present invention relates to a rod type device for measuring impact breaking and crushing performance. The long-rod impact is adopted, the influence of overlapping of reflecting stress waves on measurement is eliminated when a short-rod impact testing machine is used for measuring a load, and the real load waveform can be measured. According to the relationship between the displacement of a force applying point and the load under the condition of a long rod, the J integral can be measured. The device is additionally provided with a synchronous mechanism of an optical seam, and thus, the opening displacement of a notch of a breaking test piece can be measured; the device can be used for making a breaking test and a dynamic loading test of rock breakage. The rod type device for measuring impact breaking and crushing performance has the advantages of simple structure, high measuring precision and easy operation, and is a multifunctional device for measuring the dynamic mechanical performance of materials.
Description
The present invention relates to a kind of rod-type device for measuring performances of feature and fragmenting due to impact, it belongs to the determinator of material dynamic mechanical performance, and this device has the impact bar that length is the 300-3000 millimeter, and movably light slit synchronizing linkage are housed on support.
Up to now, the pendulum testing machine (charpy testing machine) that is used for the material fracture toughness impulse test shows as Fig. 5, pendulum (1) is raised up to free-falling behind the certain altitude, impact test piece (2), by being affixed on the sensor determination load on pendulum (1) tup, if in the time of will measuring the displacement of the test specimen point of application, then need increase by a cover displacement sensing apparatus in addition.
The shortcoming of this testing machine is: (1) because pendulum belongs to quarter butt impacts, when the foil gauge of test load is affixed on the tup because the repeatedly stack of reflection stress wave, make the waveform of surveying (showing) as Fig. 6 be subjected to very big interference and distortion; (2) must be equipped with displacement tester, just can finish the mensuration of J integrated value, (3) in addition, the pendulum testing machine does not possess Dynamic Fracture test specimen otch opening displacement test function.
The objective of the invention is to overcome the above-mentioned shortcoming in the prior art, design and a kind ofly can do tearing test, can do the fracture crushing performance determinator of the dynamic loading test of rock burst again.
Purpose of the present invention can realize by following measure:
1. the present invention changes traditional quarter butt and impacts for stock impacts, and an end of impact bar is a pancake, and the other end is a circle, and the former is used to do the fracture mechanics test of three-point bending dynamic load, and the latter is used to do the dynamic loading test of rock failure process.The impact bar cross section is circular, and diameter is the 15-50 millimeter, and length is the 300-3000 millimeter, and height of free fall is in 1.3 meters, and it is adjustable to impact end speed 0-5 meter per second, so the load amplitude of may command impact test piece makes it enough greatly, impact energy is greater than 10
8J.
The present invention adopts stock to impact, and load is measured eliminated the reflection stress wave interference and recorded true waveform (showing as Fig. 7), and when carrying out J integration mensuration, can remove the measurement of point of application shift value from, directly calculates shift value by following formula:
U（t）＝V
0t- 1/(m) ∫
t oP（t）dt
U(t in the formula) is time dependent displacement, V
0End speed during for the impact bar impact test piece, V
0Can directly be drawn by the bar drop height, P(t) be time dependent load, and m is the wave resistance value of bar.
2. device of the present invention, additional cover light slit synchronizing linkage, be used to contain the mensuration of the fracture specimen otch opening displacement of pre-crackle, the light slit synchronizing linkage comprise that side plate has " recessed " shape groove of slit and cylinder that " recessed " shape groove is connected as a single entity and is enclosed within support spring on the cylinder.The cylinder of light slit synchronizing linkage is inserted in the circular hole of support, test specimen is placed in " recessed " shape groove of light slit synchronizing linkage, when test specimen is subjected to impulsive force that impact bar applies and produces sag, the light slit synchronizing linkage overcome the small anchorage force of spring under the compressing of test specimen, with test specimen motion in the same way synchronously, increase along with load, the otch opening displacement increases, increase with the luminous flux of crossing otch by light slit, cause that the photoelectric cell illuminating area increases, because the photocurrent that photoelectric cell produced is directly proportional with illuminating area, thereby transfer the otch opening displacement of light signal the otch opening displacement of electric signal to, its time dependent curve can be noted by the transient waveform recording unit.
Description of drawings:
Fig. 1 is the rod-type device for measuring performances of feature and fragmenting due to impact structural representation.
Fig. 2 is light slit synchronizing linkage structural representations.
Fig. 3 is a light slit synchronizing linkage principle of work synoptic diagram.
Fig. 4 changes synoptic diagram for the otch opening displacement.
Fig. 5 is a pendulum testing machine structure synoptic diagram.
The load curve that Fig. 6 measures for the pendulum testing machine.
Fig. 7 is the load curve that stock impact fracture crushing performance determinator is measured.
Among Fig. 1 to Fig. 4:
1-impact bar 2-bearing 3-pulley blocks 4-nut 5-axle 6-bearing seat 7-upper backup pad 8-slide bar 9-pulley blocks 10-chuck 11-axle 12-light slit synchronizing linkage 12A-" recessed " shape groove 12B-cylinder 13-sample support axle 14-slide block 15-spring 16-base 17-circular hole 18-light source 19-test specimen 20-photoelectric cell
Narrate content of the present invention in conjunction with the accompanying drawings:
Show as Fig. 1, impact bar (1) cross section is circular, diameter is the 15-50 millimeter, length is the 300-3000 millimeter, it one be pancake, the other end is circular, impact bar is by pulley blocks (3) and pulley (9) is spacing moves up and down along two parallel slide bars (8), parallel slide bar (8) cross section is circular, has circular hole (17) in its lower end and is used to install the photoelectric displacement sensor annex.Slide bar (8) is fixed between upper backup pad (7) and the base (16) by nut (4), and pulley blocks (3) and (9) are installed in respectively on axle (5) and the axle (11), and respectively around axle (5) and (11) rotation.Axle (5) is fixed on the upper backup pad (7) by bearing seat (6), and axle (11) is fixed on the lower end of impact bar (1) by chuck (10).Show as Fig. 2, the light slit synchronizing linkage comprise " recessed " shape groove (12A) that is made of two blocks of side plates and a base plate and the cylinder (12B) that links to each other with " recessed " shape trough floor, cylinder (12B) is inserted in the circular hole of base (16), and can in circular hole, move up and down, spring (15) is enclosed within on the cylinder (12B), work to support " recessed " shape groove (12A), have long 5-20 millimeter, the slit of wide 0.3-0.7 millimeter in the middle of " recessed " shape groove (12A) biside plate.Test specimen back shaft (13) lies on the slide block (14), and slide block (14) can horizontally slip on base (16).
Device of the present invention can carry out the fracture specimen load and measure, and the J integration is measured, and the load-displacement curve of cylindrical specimen is measured and the otch opening displacement of fracture specimen is measured.
Narration utilizes device of the present invention to carry out the embodiment of above-mentioned material mechanics performance determining in conjunction with the accompanying drawings:
1. load is measured:
Show as Fig. 1 and Fig. 2, light slit synchronizing linkage (12) are removed, test specimen (19) is placed on the test specimen back shaft (13), moving slider (14), make test specimen back shaft (13) and slide block (14) correct position at test specimen (19) two ends, impact bar (1) by certain altitude free-falling impact test piece (19) until its fracture, by being affixed on the load transducer of the foil gauge composition that impacts rod end, the load that is applied on the test specimen is become electric signal, after amplifying, preserve by the waveform recording equipment records, the waveform of surveying as shown in Figure 7.
2.J the mensuration of integration:
The J integrated value is meant and test specimen is loaded the product of the integrated value under its load one amount of deflection (P-△) curve and the geometric parameter values of test specimen.On the basis of aforementioned mensuration load, directly draw the displacement that test specimen produces by following formula:
U（t）＝V
0t- 1/(m) ∫
t oP（t）dt
Every meaning front is narrated in the formula.After drawing the test specimen shift value, calculate the integrated value of load-displacement curve again and multiply by the geometric parameter of test specimen, be the J integration.
3. the mensuration of the load-displacement curve of cylindrical specimen and impact energy:
Test specimen among the embodiment 1 (19) is changed to cylinder specimen, and with the button-head impact test piece of impact bar (1), all the other processes are identical with embodiment 1,2, just can easily record the load-displacement curve of test specimen, and calculate crushing energy by integration.
4. the mensuration of the otch opening displacement value of fracture specimen:
On support (16), install light slit synchronizing linkage (12), show as Fig. 2 or Fig. 3, the rectangle test specimen (19) that will contain pre-crackle is placed in " recessed " shape groove of light slit synchronizing linkage (12), moving slider (14), make the correct position of test specimen back shaft (13) at test specimen (19) two ends, flat end impact test piece (19) with impact bar (1), because the point of application produces displacement △ (showing as Fig. 4), otch is opened, produce opening displacement, at this moment, when test specimen (19) is hit the generation sag, light slit synchronizing linkage (12) are under the compressing of test specimen (19), overcome the small anchorage force (spring (15) can be ignored to the resistance of test specimen (19)) of spring (15), be synchronized with the movement with test specimen (19), increase along with load, the otch opening displacement increases, the light signal of light source (18) makes the increment of opening displacement become light signal through the crackle of light slit on the light slit synchronizing linkage (12) and test specimen (19) and impinges upon on the photoelectric cell (20), because the photocurrent that photoelectric cell (20) is produced is directly proportional with illuminating area, therefore, photoelectric cell (20) is sent into light signal waveform recording equipment again and is preserved, as the important evidence of calculating fracture toughness COD crack opening displacement.
Be compared with existing technology, advantage of the present invention is:
1. owing to adopt long rod impact, eliminated the back wave stack that produces when quarter butt impacts, the waveform of surveying does not have any wave of oscillation impact, load waveform ideal, complete.
2. assay method is simple, and is easy and simple to handle, only needs to measure load, just can record simultaneously the displacement curve of the point of application, and the means of testing of simple possible is provided for the test of J integration.
3. solved the difficulty that to carry out the test of three-point bending fracture test specimen otch opening displacement on the existing pendulum testing machine.
4. accomplish a tractor serves several purposes, both can do destructive test, can do again the dynamic loading test of rock rupture.
Claims (4)
1, a kind of rod-type device for measuring performances of feature and fragmenting due to impact comprises support (16), upper backup pad (7), and two the parallel columns (8) that stand between support (16) and the upper backup pad (7) are formed, and it is characterized in that also comprising:
A. the cross section is that circular impact bar (1) is between two columns (8), by pulley blocks (3) with (9) are spacing moves up and down;
B. pulley blocks (3) is contained on the bearing (2), is fixed on the top of upper backup pad (7) with bearing seat (6);
C. pulley blocks (9) is contained on the axle (11), is fixed on the bottom of impact bar (1) by chuck (10);
D. have slit on " recessed " shape groove (12A) both sides side plate of light slit synchronizing linkage (12);
E. the cylinder (12B) of light slit synchronizing linkage (12) bottom is inserted in the circular hole of base (16);
F. support spring (15) is enclosed within on the cylinder (12B), one end contacts with the base plate of " recessed " shape groove (12A), the other end contacts with the upper surface of support (16), light slit synchronizing linkage (12) are supported by spring (15), move up and down in the circular hole of base (16) in the same way synchronously with the amount of deflection of test specimen (19);
G. test specimen back shaft (13) lies on the slide block (14), and slide block (14) contacts with base (16), and goes up slip at base (16).
2, according to the device of claim 1, it is characterized in that described impact bar (1) diameter is the 15-50 millimeter, length is the 300-3000 millimeter.
3, according to the device of claim 1 or 2, it is characterized in that described impact bar (1) one end is a pancake, the other end is circular.
4,, it is characterized in that middle wide 0.3-0.7 millimeter, the slit of long 5-20 millimeter of having of side plate of the Baltimore groove (12A) of described light slit synchronizing linkage (12) according to the device of claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88105010 CN1011342B (en) | 1988-01-23 | 1988-01-23 | Rod-type device for measuring performances of feature and fragmenting due to impact |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88105010 CN1011342B (en) | 1988-01-23 | 1988-01-23 | Rod-type device for measuring performances of feature and fragmenting due to impact |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1032396A CN1032396A (en) | 1989-04-12 |
| CN1011342B true CN1011342B (en) | 1991-01-23 |
Family
ID=4833244
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 88105010 Expired CN1011342B (en) | 1988-01-23 | 1988-01-23 | Rod-type device for measuring performances of feature and fragmenting due to impact |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1011342B (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE602006019055D1 (en) * | 2005-04-29 | 2011-02-03 | Agency Science Tech & Res | TEST DEVICE FOR MICRO EATS |
| CN101509856B (en) * | 2008-12-30 | 2011-03-23 | 南京理工大学 | Multifunction flexible composite material impact test apparatus |
| CN108133645B (en) * | 2017-12-18 | 2023-04-18 | 安徽工程大学 | Impact experiment device and method |
| CN108663185A (en) * | 2018-07-16 | 2018-10-16 | 南京钢铁股份有限公司 | A kind of frame mounting and its application method for NDT experiments |
| CN109839309A (en) * | 2019-02-19 | 2019-06-04 | 中国第一汽车股份有限公司 | A kind of delayed fracture pilot system |
| CN111189727A (en) * | 2020-01-13 | 2020-05-22 | 长安大学 | Test device and method for testing material damage |
-
1988
- 1988-01-23 CN CN 88105010 patent/CN1011342B/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| CN1032396A (en) | 1989-04-12 |
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