CN207336249U - A kind of plant haulm buckling safety factor measure device - Google Patents
A kind of plant haulm buckling safety factor measure device Download PDFInfo
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- CN207336249U CN207336249U CN201721509986.0U CN201721509986U CN207336249U CN 207336249 U CN207336249 U CN 207336249U CN 201721509986 U CN201721509986 U CN 201721509986U CN 207336249 U CN207336249 U CN 207336249U
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- telescopic rod
- supporting rod
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Abstract
It the utility model is related to a kind of plant haulm buckling safety factor measure device.The plant haulm buckling safety factor measure includes vertical supporting rod and horizontal pull device with device, a first level telescopic rod is connected between vertical supporting rod and horizontal pull device, vertical supporting rod above first level telescopic rod is arranged first sleeve and the second casing, first sleeve and the second casing are connected by tight fixed bolt and perpendicular support supporting rod, be connected square plate in the first sleeve side opposite with the tight fixed bolt in first sleeve, slided after plate face is gone forward on the right side of the square plate and set the second horizontal extension bar, it is connected protractor in the second horizontal extension bar right end, before the second casing side opposite with the tight fixed bolt on the second casing, rear portion is opposite to set two connecting rods, be connected spring clip between two connecting rod right ends.Design is scientific and reasonable with apparatus structure for the plant haulm buckling safety factor measure, it is simple and practical, measure and use easy to plant stability safety coefficient.
Description
Technical field：
It the utility model is related to a kind of plant haulm buckling safety factor measure device.
Background technology：
Bending and lodging is occurred by environmental stimuli and pressure in plant stem, and plant haulm has certain anti-flexing and resists
Lodging ability, weight can be played by the anti-flexing and lodging resistance of observing plant haulm to plant growth and high crop yield research
Act on.
Wind pressure is plant haulm by one of common stimulation of ectocine, plant haulm under wind-force effect compressing bending,
Even final fracture, by the measure of its bending force and disruptive force and then can obtain plant haulm buckling safety factor, this number
Follow-up study work of the acquisition of value to plant haulm index is of great significance.However, bending force and the fracture of plant haulm
The measure of power is influenced by plant self performance, and such as plant height, fruit are distributed, and therefore, consider plant itself
Feature carries out These parameters measure, has directive significance to the accuracy of final data measure.
Found in the work of laboratory research at this stage, existing instrument and equipment product is only capable of the disconnected of simple test plant haulm
The size of power is split, not considering plant height, the distribution of blade fruit etc. is influenced plant be subject to external mechanical stimulation,
The reference value that measurement result works laboratory research is not high.
Utility model content：
The utility model is in order to make up for the deficiencies of the prior art, there is provided a kind of scientific structure design is reasonable, it is simple and practical,
Device easy to operate, easy to plant haulm buckling safety factor measure, solves problems of the prior art.
The utility model is achieved by the following technical solution：
A kind of plant haulm buckling safety factor measure device, including vertical supporting rod and opposite with vertical supporting rod set
The horizontal pull device put, connects a first level telescopic rod, in the first water between vertical supporting rod and horizontal pull device
A first sleeve and the second casing are arranged on vertical supporting rod above flat telescopic rod, first sleeve and the second casing are by tight
Determine bolt to be connected with vertical supporting rod, be connected in the first sleeve side opposite with the tight fixed bolt in first sleeve one square
Plate, slides after plate face is gone forward on the right side of the square plate and is equipped with one second horizontal extension bar, and one is connected in the second horizontal extension bar right end
Protractor, the front and rear portions in the second casing side opposite with the tight fixed bolt on the second casing are equipped with two connecting rods relatively, two
Be connected a spring clip between connecting rod right end.
The horizontal pull device includes a vertical telescopic rod being connected with first level telescopic rod right end, is stretching vertically
Front side is equipped with the straight slot that one or so perforation is set, a fixed spring scale on straight slot madial wall at the top of bar；At vertical supporting rod bottom
End is equipped with a base, is equipped with a roller in vertical telescopic rod bottom, and the bottom and base bottom of the roller are flush setting.
The horizontal pull device includes a vertical telescopic rod being connected with first level telescopic rod right end, is stretching vertically
The through hole that one or so perforation is set is equipped with the top of bar, is slided in through hole and is equipped with a spring scale, is connected a company in spring scale right end
Extension bar, be connected a tilting bar on vertical telescopic rod top, in the fixed disk in tilting bar top, is set in the circle centre position of disk
Shaft is equipped with a bull stick, and the bottom of bull stick is hinged with the connecting rod right end, and be connected one and disk on front side of the top of bull stick
The bar handle of the perpendicular setting of card；A base is equipped with vertical supporting rod bottom and vertical telescopic rod bottom.
A bending slideway is equipped with square plate right flank, the bending slideway includes the leading portion and back segment bent up and down,
The front and rear sections of bending slideway are upper and lower to be arranged in parallel, and card is slided in bending slideway and sets a sliding block, the outer end of sliding block and the second water
Flat telescopic rod left end is connected, and the second horizontal extension bar right end is connected with protractor left end.
A spacing strip slot is equipped with front side of vertical supporting rod, spacing strip is corresponded on the inside of first sleeve and the second casing
Groove is equipped with the stick with the upper and lower setting that is slidably matched of the spacing strip slot.
Scale is equipped with vertical supporting rod.
The beneficial effects of the utility model:
Plant haulm buckling safety factor measure apparatus structure design science, rationally, can conveniently clamping, firm plant
Stalk, use, operation are flexible.By the setting of puller system, the horizontal stability during pulling force application ensure that well
It is required that.In plant haulm by the horizontal drawing process of puller system, by the protractor set on vertical supporting rod, easily survey
Determine stalk angle of bend, due to protractor on square plate fore-aft adjustable, it is adjustable up and down on vertical supporting rod, facilitate specific
Operation.Puller system is designed as two kinds, the first is passed through using fixed spring scale and by the way of moving horizontally vertical telescopic rod
The roller of vertical telescopic rod bottom, ensure that mobile flexibility；Second using bar rotation and then drive spring scale is perpendicular
Moved horizontally on straight telescopic rod, it is time saving and energy saving.By the measurement data that plant change obtains during whole operation, easy to study
Personnel obtain the accurate and more plant haulm buckling safety factor of reference value.Plant haulm buckling safety factor measure is used
Apparatus structure is compact, can be furthered vertical supporting rod and flexible distance between tie rods vertically by adjusting first level telescopic rod, reduce and account for
Ground area, is adapted to storage, easy to carry, brings great convenience for research work, economical and practical.
Brief description of the drawings：
Fig. 1 is the structure diagram of the utility model embodiment 1；
Fig. 2, which is that square plate is right in Fig. 1, regards enlarged structure schematic diagram；
Fig. 3 is the structure diagram of the utility model embodiment 2.
It is 1 vertical supporting rod, 2 first level telescopic rods, 3 first sleeves, 4 second casings, 5 tight fixed bolts, 6 square in figure
Plate, 7 second horizontal extension bars, 8 protractors, 9 connecting rods, 10 spring clips, 11 vertical telescopic rods, 12 straight slots, 13 spring scales, 14 bottoms
Seat, 15 rollers, 16 through holes, 17 connecting rods, 18 tilting bars, 19 disks, 20 bull sticks, 21 bar handles, 22 bending slideways, 23 sliding blocks,
24 spacing strip slots, 25 sticks.
Embodiment：
In order to clarify the technical characteristics of the invention, below by embodiment, and its attached drawing is combined, to this reality
It is described in detail with new.
Embodiment 1
As shown in attached drawing 1-2, which includes setting graduated vertical support
Bar 1 and the horizontal pull device being oppositely arranged with vertical supporting rod, one is connected between vertical supporting rod 1 and horizontal pull device
First level telescopic rod 2, is arranged a first sleeve 3 and the second casing on the vertical supporting rod above first level telescopic rod 2
4,3 and second casing 4 of first sleeve is connected by tight fixed bolt 5 and vertical supporting rod 1, with the tightening in first sleeve 3
The opposite first sleeve side of bolt is connected a square plate 6, slides that to be equipped with one second horizontal after 6 right side plate face of square plate is gone forward
Telescopic rod 7, is connected a protractor 8 in 7 right end of the second horizontal extension bar, opposite with the tight fixed bolt on the second casing 4
The front and rear portions of two casing sides are opposite to be equipped with two connecting rods 9 being oppositely arranged, and one is connected between two connecting rods, 9 right end with propping up vertically
The spring clip 10 of 1 corresponding setting of strut.
The horizontal pull device includes a vertical telescopic rod 11 being connected with 2 right end of first level telescopic rod, vertical
The top of telescopic rod 11 front side is equipped with the straight slot 12 that one or so perforation is set, a fixed spring scale 13 on 12 madial wall of straight slot；
Vertical 1 bottom of supporting rod is equipped with a base 14.A roller 15, the bottom of the roller 15 can also be set in vertical 11 bottom of telescopic rod
End is flush setting with 14 bottom of base.
Be equipped with a bending slideway 22 on 6 right flank of square plate, the bending slideway 22 include the leading portion that bends up and down and
Back segment, the front and rear sections of bending slideway 22 are upper and lower to be arranged in parallel, and sliding card in bending slideway 22 sets a sliding block 23, sliding block 23
Outer end is connected with 7 left end of the second horizontal extension bar, and 7 right end of the second horizontal extension bar is connected with 8 left end of protractor.
A spacing strip slot 24 is equipped with the vertical front side of supporting rod 1, in the corresponding limit in the inner side of 3 and second casing of first sleeve 4
Position strip slot 24 is equipped with the stick 25 with the upper and lower setting that is slidably matched of the spacing strip slot.Stick in first sleeve 3 is set
Between the tight fixed bolt and square plate of first sleeve on the first sleeve madial wall at middle part, the stick on the second casing 4 is arranged on
Between second sleeve side walls of tight fixed bolt and connecting spring the folder side of the second casing on the second casing madial wall at middle part.
The setting of spacing strip slot 24 and stick 25, avoids first sleeve and the second casing in vertical supporting rod circumferential direction side
To movement, so as to ensure that the position in the firm operating process of axis clamping, avoid before and after itself and spring scale position produce
Misplace the larger trouble for being inconvenient to catch on plant.Spacing strip groove top end may be configured as open, such first sleeve and second
Casing can be removed from vertical supporting rod 1, convenient maintenance.
Operation principle：The device can be used for measuring plant in normal state, the size for the power that stem is born.In addition, plant
The reaction that thing adapts to mechanical stimulus can be divided into two kinds：One kind is that stem becomes harder, and one kind is to become relatively more flexible.The dress
The measure by maximum disruptive force and bending force is put, it is anti-with the ratio of disruptive force and bending force (it is known as buckling safety factor)
Variation tendency of the axis under mechanical stimulus is answered, measure becomes harder or softer.Buckling safety factor, i.e., above-mentioned ratio
Numerical value, diminish the trend for indicating to become harder, and the expression that becomes larger becomes softer trend.This measure can be used for more same
The mechanical behavior difference of plant, different processing, the variation tendency of its mechanical strength, or more different plant species.
In use, taking plant, plant bottommost is clamped with spring clip 10, during clamping, can suitably be adjusted
Second horizontal extension bar 7 avoids the plant top of clamping from being led to by 8 barrier of protractor in the position of the bending slideway 22 of square plate 6
After crossing the firm plant of the clamping of spring clip 10, the appropriate position for adjusting the second casing 4 on vertical supporting rod 1, with tight after regulating
Determine bolt to fix, at this time, adjust the second horizontal extension bar 7, by slip of the sliding block 23 in bending slideway 22, make protractor 8
The front side or rear side for fitting in axis are set, while the appropriate position for adjusting first sleeve 3 on vertical supporting rod 1, the amount of making
The origin of angle device 8 is also fixed as close to the bottom that axis is clamped by spring clip 10 with tight fixed bolt thereon.Then adopt
Horizontal force is carried out with puller system and draws axis, is simulated exterior mechanical stimulus, is obtained axis buckling safety factor.
Operation requires：Simulate wind action, it is assumed that wind-force all applies on leaf, and force action is in position in height
Put, therefore, the height being subject on axis at the top of the leaf position to axis of lowest point, this is fixed on by spring scale pulling force
Horizontal pulling function observation is carried out among one height.
Vertical telescopic rod 11 is adjusted, spring scale 13 is located on axis lowest point leaf position to this height of stem top
Middle part, and the axis of the position is caught on, it is appropriate to adjust first level telescopic rod 2, make the natural hooks plants stem of spring scale 13,
Then gradually horizontal to the right to pull spring scale 13, roller 15 moves, and axis occurs under the pulling force effect of spring scale 13
Bending, can obtain the change of angle of bend from protractor 8, gradually be pulled to axis fracture, obtain maximum disruptive force, or draw
Stop to axis 90-degree bent, obtain endurance size.It is worth noting that, the second horizontal extension bar 7 used in this embodiment
Using it is movable readily, as the small as possible horizontal extension rod structure (such as flexibly flexible telescopic pipe) of stretching frictional force, to avoid
The telescoping friction of second horizontal extension bar 7 is disturbed caused by 13 pulling force of spring scale, crucial of the second horizontal extension bar herein
To the guiding role for maintaining tension level；The setting of roller facilitates to be used during laboratory simulation on smooth platform, in the wild when can
Roller is not provided with, is disturbed with reducing field ground unevenness caused by drawing force.Bending force bends power once for axis
Size, pass through the ratio of maximum disruptive force/endurance and bending force i.e. obtain stalk buckling safety factor.
If desired simulated trampling acts on, and by adjusting vertical telescopic rod 11, spring scale is adjusted to apart from the lower portion of the stem 5-
5-10cm above 10cm, i.e. spring clip retaining part, raises generally 5-10 centimetres of distance, then, according to above-mentioned because walking
Method is horizontal to pull spring scale, surveys disruptive force size.During simulated trampling, spring scale is always maintained at straight with penis and testes, and power is in vertical side
To downward, the size of the power of fracture is multiplied by cos angles for measuring force, and angle is stem and ground angle here.
The coupler body of spring scale 13 is horizontal direction in figure, conveniently catches on axis, it is illustrated that coupler body style is intended merely to conveniently
Expression.
Embodiment 2
As shown in Figure 3, which includes setting graduated vertical supporting rod 1
With the horizontal pull device being oppositely arranged with vertical supporting rod, one the is connected between vertical supporting rod 1 and horizontal pull device
One horizontal extension bar 2, is arranged a first sleeve 3 and the second casing 4 on the vertical supporting rod above first level telescopic rod 2,
3 and second casing 4 of first sleeve is connected by tight fixed bolt 5 and perpendicular support supporting rod 1, with the tightening in first sleeve 3
The opposite first sleeve side of bolt is connected a square plate 6, slides that to be equipped with one second horizontal after 6 right side plate face of square plate is gone forward
Telescopic rod 7, is connected a protractor 8 in 7 right end of the second horizontal extension bar, opposite with the tight fixed bolt on the second casing 4
The front and rear portions of two casing sides are opposite to be equipped with two connecting rods 9 being oppositely arranged, and one is connected between two connecting rods, 9 right end with propping up vertically
The spring clip 10 of 1 corresponding setting of strut.
The horizontal pull device includes a vertical telescopic rod 11 being connected with 2 right end of first level telescopic rod, vertical
The top of telescopic rod 11 is equipped with the through hole 16 that one or so perforation is set, and horizontal slide is equipped with a spring scale 13 in through hole 16, in bullet
13 right end of spring scale is connected a connecting rod 17, and be connected a tilting bar 18 on vertical 11 top of telescopic rod, fixed on 18 top of tilting bar
One disk 19, a bull stick 20, the bottom of bull stick 20 and the connecting rod 17 are equipped with the shaft of the circle centre position setting of disk 19
Right end is hinged, and be connected a bar handle 21 with the perpendicular setting of disk disk on front side of the top of bull stick 20；In vertical supporting rod 1
Bottom and 11 bottom of vertical telescopic rod are equipped with a base 14.
Be equipped with a bending slideway 22 on 6 right flank of square plate, the bending slideway 22 include the leading portion that bends up and down and
Back segment, the front and rear sections of bending slideway 22 are upper and lower to be arranged in parallel, and sliding card in bending slideway 22 sets a sliding block 23, sliding block 23
Outer end is connected with 7 left end of the second horizontal extension bar, and 7 right end of the second horizontal extension bar is connected with 8 left end of protractor.
A spacing strip slot 24 is equipped with the vertical front side of supporting rod 1, in the corresponding limit in the inner side of 3 and second casing of first sleeve 4
Position strip slot 24 is equipped with the stick 25 with the upper and lower setting that is slidably matched of the spacing strip slot.Stick in first sleeve 3 is set
Between the tight fixed bolt and square plate of first sleeve on the first sleeve madial wall at middle part, the stick on the second casing 4 is arranged on
Between second sleeve side walls of tight fixed bolt and connecting spring the folder side of the second casing on the second casing madial wall at middle part.
The setting of spacing strip slot 24 and stick 25, avoids first sleeve and the second casing in vertical supporting rod circumferential direction side
To movement, so as to ensure that the position in the firm operating process of axis clamping, avoid before and after itself and spring scale position produce
Dislocation is inconvenient to the trouble caught on.
Operation principle is no longer described in detail herein with the operation principle of embodiment 1.
In use, taking plant, plant bottommost is clamped with spring clip 10, during clamping, can suitably be adjusted
Second horizontal extension bar 7 avoids the plant top of clamping from being led to by 8 barrier of protractor in the position of the bending slideway 22 of square plate 6
After crossing the firm plant of the clamping of spring clip 10, the appropriate position for adjusting the second casing 4 on vertical supporting rod 1, with tight after regulating
Determine bolt to fix, at this time, adjust the second horizontal extension bar 7, by slip of the sliding block 23 in bending slideway 22, make protractor 8
The front side or rear side for fitting in axis are set, meanwhile, the appropriate position for adjusting first sleeve 3 on vertical supporting rod 1, the amount of making
The origin of 8 device of angle is also fixed as close to the bottom that axis is clamped by spring clip 10 with tight fixed bolt thereon.Then adopt
Horizontal force is carried out with puller system and draws axis, is simulated exterior mechanical stimulus, is obtained axis buckling safety factor.
Operating requirement is：Simulate wind action, it is assumed that wind-force all applies on leaf, and force action is in the middle part of height
Position, therefore, the height being subject on axis at the top of the leaf position to axis of lowest point, spring scale pulling force is fixed on
Horizontal pulling function observation is carried out among this height.
Vertical telescopic rod 11 is adjusted, spring scale 13 is located on axis lowest point leaf position to this height of stem top
Middle part, elongates first level telescopic rod 2, and hand-held pole handle 21 rotates clockwise, and makes the right side of connecting rod 17 being connected on spring scale 13
End is moved at 16 position of through hole at the vertical top of telescopic rod 11, appropriate to adjust first level telescopic rod 2, makes the scale of spring scale 13
The natural hooks plants stem of hook, by bar handle 21, slowly rotates bull stick 20, bull stick 20 pulls spring scale 13 vertical counterclockwise
Horizontal in the through hole of telescopic rod 11 to pull axis to the right, axis is gradually curved under a stretching force, can be with from protractor 8
The change of angle of bend is obtained, is gradually pulled to axis fracture, obtains maximum disruptive force, or is pulled to stem 90-degree bent, is born
Power size.Second horizontal extension bar 7 of this embodiment, which mainly rises, adjusts spacing between vertical supporting rod 1 and vertical telescopic rod 11
Effect, during actual extension spring scale 13, the second horizontal extension bar 7 is failure to actuate.Bending force is bent once for axis
The size of power, stalk buckling safety factor is obtained by maximum disruptive force/endurance and bending force ratio.
If needing simulated trampling to act on, by adjusting vertical telescopic rod 11, spring scale is adjusted to apart from the lower portion of the stem 5-10cm,
That is 5-10cm above spring clip retaining part, raises generally 5-10 centimetres of distance, then, according to the present embodiment because walking
The above method is horizontal to pull spring scale, surveys disruptive force size.During simulated trampling, spring scale is always maintained at straight with penis and testes, and power is perpendicular
For Nogata to downward, the size of the power of fracture is multiplied by cos angles for measuring force, and angle is stem and ground angle here.
Above-mentioned embodiment cannot function as the limitation to scope of protection of the utility model, for the skill of the art
For art personnel, any alternate modification or conversion made to the utility model embodiment all fall within the guarantor of the utility model
In the range of shield.
Part is not described in detail for the utility model, is the known technology of those skilled in the art of the present technique.
Claims (6)
1. a kind of plant haulm buckling safety factor measure device, it is characterized in that：Supported including vertical supporting rod and with vertical
The horizontal pull device that bar is oppositely arranged, connects a first level telescopic rod between vertical supporting rod and horizontal pull device,
A first sleeve and the second casing, first sleeve and the second casing are arranged on the vertical supporting rod above first level telescopic rod
It is connected by tight fixed bolt and vertical supporting rod, is connected in the first sleeve side opposite with the tight fixed bolt in first sleeve
One square plate, slides after plate face is gone forward on the right side of the square plate and is equipped with one second horizontal extension bar, in the second horizontal extension bar right end
Be connected a protractor, and the front and rear portions in the second casing side opposite with the tight fixed bolt on the second casing are opposite to be equipped with two companies
Bar, be connected a spring clip between two connecting rod right ends.
2. a kind of plant haulm buckling safety factor measure device according to claim 1, it is characterized in that：The level
Puller system includes a vertical telescopic rod being connected with first level telescopic rod right end, and front side is equipped with one at the top of vertical telescopic rod
The straight slot that left and right perforation is set, a fixed spring scale on straight slot madial wall；A base is equipped with vertical supporting rod bottom, perpendicular
Straight telescopic rod bottom is equipped with a roller, and the bottom and base bottom of the roller are flush setting.
3. a kind of plant haulm buckling safety factor measure device according to claim 1, it is characterized in that：The level
Puller system includes a vertical telescopic rod being connected with first level telescopic rod right end, and one or so is equipped with the top of vertical telescopic rod
The through hole set is penetrated through, is slided in through hole and is equipped with a spring scale, be connected a connecting rod in spring scale right end, in vertical telescopic rod
Top is connected a tilting bar, and in the fixed disk in tilting bar top, a bull stick is equipped with the shaft that sets of circle centre position of disk,
The bottom of bull stick is hinged with the connecting rod right end, and be connected a bar with the perpendicular setting of disk disk on front side of the top of bull stick
Handle；A base is equipped with vertical supporting rod bottom and vertical telescopic rod bottom.
4. according to a kind of any plant haulm buckling safety factor measure devices of claim 1-3, it is characterized in that：
Square plate right flank is equipped with a bending slideway, and the bending slideway includes the leading portion and back segment bent up and down, bends slideway
Front and rear sections are upper and lower to be arranged in parallel, and card is slided in bending slideway and sets a sliding block, the outer end of sliding block is left with the second horizontal extension bar
End is connected, and the second horizontal extension bar right end is connected with protractor left end.
5. according to a kind of any plant haulm buckling safety factor measure devices of claim 1-3, it is characterized in that：
Be equipped with a spacing strip slot on front side of vertical supporting rod, corresponded on the inside of first sleeve and the second casing spacing strip slot be equipped with and
The stick of the upper and lower setting that is slidably matched of spacing strip slot.
6. according to a kind of any plant haulm buckling safety factor measure devices of claim 1-3, it is characterized in that：
Vertical supporting rod is equipped with scale.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721509986.0U CN207336249U (en) | 2017-11-13 | 2017-11-13 | A kind of plant haulm buckling safety factor measure device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721509986.0U CN207336249U (en) | 2017-11-13 | 2017-11-13 | A kind of plant haulm buckling safety factor measure device |
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| Publication Number | Publication Date |
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| CN207336249U true CN207336249U (en) | 2018-05-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201721509986.0U Expired - Fee Related CN207336249U (en) | 2017-11-13 | 2017-11-13 | A kind of plant haulm buckling safety factor measure device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109030178A (en) * | 2018-08-14 | 2018-12-18 | 江苏徐淮地区淮阴农业科学研究所 | Gramineous crop stalk fracture resistence force rapid determination device |
-
2017
- 2017-11-13 CN CN201721509986.0U patent/CN207336249U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109030178A (en) * | 2018-08-14 | 2018-12-18 | 江苏徐淮地区淮阴农业科学研究所 | Gramineous crop stalk fracture resistence force rapid determination device |
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Granted publication date: 20180508 Termination date: 20201113 |