CN101363784A - Method for measuring geometry and mechanical property of single layer weaving belt for fishing - Google Patents
Method for measuring geometry and mechanical property of single layer weaving belt for fishing Download PDFInfo
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- CN101363784A CN101363784A CNA2007100446008A CN200710044600A CN101363784A CN 101363784 A CN101363784 A CN 101363784A CN A2007100446008 A CNA2007100446008 A CN A2007100446008A CN 200710044600 A CN200710044600 A CN 200710044600A CN 101363784 A CN101363784 A CN 101363784A
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Abstract
A fishing-used monolayer woven belt geometric structure and mechanical property testing method relates to the test of a monolayer woven belt. A method suitable for testing the fishing used monolayer woven belt geometric structure and the mechanical property is required. The method comprises the steps of sampling, treating the end of a sample, conducting the moisture balance for the sample, and conducting the strength test for a single yarn and the woven belt. The method is characterized in that the single yarn sample is obtained in the position 50m higher than the end of the single yarn; the woven belt sample is obtained in the position 5m higher than the end of the woven belt; the ends of the woven belt are cut off, melted and treated by using the melting method; moisture balance is conducted for a dry sample for 24h under the atmospheric conditions that the temperature is 20 DEG C and the humidity is 65%; a wet sample is soaked in a container with the temperature being 20 DEG C for 24 hours; pretension is applied when the breaking strength and the breaking elongation rate are measured; the breaking strength and the breaking elongation rate are recorded and calculated from a recording device in a testing machine; and the number of the effective testing in experiments is less than 20. The invention is used for testing the fishing-used monolayer woven belt geometric structure and mechanical property.
Description
Technical field:
The invention belongs to single layer weaving belt for fishing geometry and mechanics performance determining method.
Background technology
Single layer weaving belt for fishing is a raw material with filament of synthetic fibre such as polypropylene fibre, terylene, polyamide fibres mainly, is alternately formed through other yarn braiding by every one thread, and it is one of important materials in the fish production, is used widely in fishery engineering.China's fishery is fished for fishery and change off land deep water net cage aquaculture development to the high sea, ocean just gradually, and the operating environment of fishing for fishing boat and breed work boat is more and more abominable.Because of not wearing safe braid over braid, fatal accident sometimes falls into the sea under multiple factor during fisherman's operation at sea.In order to reduce and the accident that falls into the sea when avoiding fisherman's operation at sea, national departments concerned mandatory provision ocean fishing vessel must be equipped with the safe braid over braid of fishing.At present, domestic existing a lot of manufacturer production are fished for and the fishery engineering single layer weaving belt.The braid over braid mechanical property is the main cause of the intensity that influences goods, safety, thickness, soft firmly, weight, gas penetration potential, size, braid over braid cost and term of life.Along with the continuous expansion of braid over braid application, its geometry and mechanical property are studied in people's an urgent demand.For the mechanical property of reacting single layer weaving belt for fishing, better estimate its quality and safety in utilization, provide foundation for fishing for when the apolegamy braid over braid material with the fishery engineering personnel, need carry out the single layer weaving belt for fishing mechanical property test.But China's marine industry had not both had the braid over braid product standard at present, did not have braid over braid mechanics performance determining method again.This has brought difficulty for fishery engineering personnel selection braid over braid material, and factory and user produce dispute because of the problem of braid over braid physical index again.Because it is land that the environment for use of single layer weaving belt for fishing is different from, and concerning fisherman's personal safety and fishing equipment safety, in case it is disrumpent feelings that braid over braid takes place, and will bring hidden danger to fish production, presses for a kind of single layer weaving belt for fishing geometry and mechanics performance determining method.
Summary of the invention
The problem that the present invention need solve provides a kind of geometry and mechanics performance determining method that is applicable to single layer weaving belt for fishing.
The present invention includes through or the sampling of broadwise single thread sample, the sampling of braid over braid sample and processing, sample damping balance, single thread and the braid over braid strength test mode of termination thereof, it is characterized in that the single thread sample is obtained at the above place of the terminal 50m of distance single thread, the braid over braid sample is obtained at the above place of the terminal 5m of distance braid over braid, when cutting dried, hygrometric state sample simultaneously, must cut two samples continuously in the direction that sample is stretched at every turn; The work effective dimensions of sample is chosen by test event: it is long for 100m to be used for the test of single thread line density, being used for the braid over braid length testing is 1 volume, be used for braid over braid width, thickness, long for 1m through close, filling density, unit weight, warp or broadwise single thread fracture strength and breaking elongation test, be used for following braid over braid ultimate strength of rated load 0.5kN and breaking elongation test and be 1m length, the effective length that is used for the soft ring sample of two ends band of above braid over braid ultimate strength of rated load 0.5kN and breaking elongation test is that 2m is long; Melt process is carried out with the thawing method in the termination of cutting off braid over braid; The dry state sample soaks 24h at least in the 24h of damping balance at least under the atmospheric conditions of temperature (20 ± 2) ℃, humidity (65 ± 3) %, the hygrometric state sample container in water temperature (20 ± 2) ℃; When measuring, warp or broadwise single thread ultimate strength and breaking elongation in the upper and lower pneumatic flat mouthful of anchor clamps of strength tester, sample is installed, the pre-tension that the dry state sample is applied equals the deadweight of identical rugosity single thread 250m length, the pre-tension that the hygrometric state sample is applied equals the deadweight of identical rugosity single thread 125m length, behind average rupture time (20 ± 3) s that satisfies regulation the single thread sample is stretched until the single thread fracture, the ultimate strength of single thread sample and elongation at break values write down from the pen recorder of testing machine and calculate; During the braid over braid length measurment braid over braid is positioned on smooth, the dry place, shakeouts and make braid over braid fully to stretch, from an end of braid over braid, the order continuous coverage is till the other end of braid over braid, and the straight-line dimension that it constituted is braid over braid length; Use width, the thickness of vernier caliper, micron miking braid over braid respectively; Braid over braid through or filling density remove braid over braid part latitude or warp thread when measuring, check warp or the total radical of weft yarn in every cm width, calculate braid over braid through close or filling density; Weigh the quality of getting 1m first draft ribbon in the balance, calculate the braid over braid unit weight; For the braid over braid below the rated load 0.5kN, adopting strength tester to carry out braid over braid ultimate strength and breaking elongation is pneumatic flat mouthful of anchor clamps more than the 60mm in that width is installed on the testing machine before measuring, one end of specimen width direction is all entirely sandwiched anchor clamps, sandwich pneumatic down flat mouthful of anchor clamps after the other end of specimen width direction adds pre-tension, the pre-tension value of dry state sample equaled identical rugosity single thread 250N when the braid over braid ultimate strength was measured
1(N
1Be the total radical of warp thread of braid over braid specimen width direction) deadweight of Mi Changdu, the pre-tension of hygrometric state sample equals identical rugosity 125N
1The deadweight of rice single thread length stretches until fracture to sample under the 100mm/min draw speed, and the ultimate strength of sample and elongation at break values write down from the pen recorder of testing machine and calculate; For the braid over braid more than the rated load 0.5kN, adopt the fixedly flat soft ring at sample two ends of cylindrical pin when adopting strength tester to carry out braid over braid ultimate strength and breaking elongation mensuration, testing machine is loaded on pre-tension and writes down the length of braid over braid sample under pre-tension, under 100mm/min speed the braid over braid sample is stretched until fracture, the ultimate strength of sample and elongation at break values write down from the pen recorder of testing machine and calculate; Test is effectively measured time number average and is no less than 20 times.
The present invention fishes for fishery engineering for solution and provides a kind of simple and clear effective method with the detection and the quality assessment of single layer weaving belt geometry and mechanical property, remedy the deficiency of existing gear material detection method preferably, for engineering technical personnel provide reliable basis on the braid over braid material selection.This method range of application is wide, also is applicable to the detection and the quality assessment of single layer weaving belt geometry such as book strap, shoulder backpack strip, field article band, notebook backpack strip, hand-strap, neck are linked with, shoulder harness, camera harness and mechanical property.
Description of drawings
Fig. 1 represents the schematic perspective view of the braid over braid sample of the soft ring of two ends band.
Fig. 2 represent through or broadwise single thread ultimate strength and breaking elongation test synoptic diagram.
Fig. 3 represents to test braid over braid ultimate strength and breaking elongation synoptic diagram.
The cylindrical pin that Fig. 4 represents the strength test machine clamp is the soft ring synoptic diagram in sample two ends fixedly.
Embodiment
Among Fig. 1, Fig. 41 representative utilizes confession that suture line the makes fixing flat soft ring used of sample on the cylindrical pin of RHZ-1600 type strength test machine clamp, the braid over braid seam that the representative of 2 among Fig. 1, Fig. 4 forms when utilizing suture line to make flat soft ring; Among Fig. 2, Fig. 33 represents the last anchor clamps of the pneumatic flat mouthful of anchor clamps of INSTRON 4466 type strength testers, and 4 among Fig. 2 represents the single thread sample, and 5 among Fig. 2, Fig. 3 represents the lower clamp of the pneumatic flat mouthful of anchor clamps of INSTRON 4466 type strength testers, the L among Fig. 2
1Distance (500mm) when representing the single thread test between INSTRON4466 type strength test machine clamp; Among Fig. 36 represents the braid over braid sample, the L among Fig. 3
2Distance (200mm) when representing the braid over braid test between INSTRON 4466 type strength test machine clamps; Among Fig. 47 represents the cylindrical pin of RHZ-1600 type strength test machine clamp.
In order to prevent and avoid deviation, obtain evaluation result accurately, represent to specify assay method at atmospheric conditions, test condition, sampling and the sample preparation, assay method, data processing and the result that influence single layer weaving belt geometry and Mechanics Performance Testing result below:
Atmospheric conditions: fish for fishery engineering and be controlled at temperature (20 ± 2) ℃, humidity (65 ± 3) % with breadboard atmospheric conditions in single layer weaving belt geometry and the mechanics performance determining process;
Sample must reach the requirement of dry state and hygrometric state, the dry state sample is the 24h of damping balance at least under the atmospheric conditions of temperature (20 ± 2) ℃, humidity (65 ± 3) %, the hygrometric state sample soaks 24h at least in the container of water temperature (20 ± 2) ℃, make it not have significant difference at continuation immersion longer time back braid over braid ultimate strength and breaking elongation, for sample is soaked into fully, also can in water, add and be no more than 0.05% nonionic intermediate wet agent;
Test condition: the electronic type strength tester uses in allowing range ability, and the mechanical type strength tester should use in the scope of (25～75) of nominal range %;
INSTRON4466 type strength tester is adopted in warp or broadwise single thread ultimate strength and breaking elongation test, and pneumatic flat mouth anchor clamps are used in test, and the width of anchor clamps (3 among Fig. 2,5) is more than the 60mm, (the L among Fig. 2 of the distance during test between anchor clamps
1) be 500mm;
For the braid over braid below the rated load 0.5kN, ultimate strength and breaking elongation are measured and are adopted INSTRON 4466 type strength testers, the pneumatic flat mouthful of anchor clamps of the general use of test, and the width of anchor clamps (3 among Fig. 3,5) is more than the 60mm;
For the braid over braid more than the rated load 0.5kN, ultimate strength and breaking elongation are measured and are adopted RHZ-1600 type strength tester, the fixedly flat soft ring at sample two ends (1 among Fig. 1, Fig. 4) of cylindrical pin (7 among Fig. 4) is adopted in test, and the effective length of the flat soft ring sample of two ends band is 2.000m (Fig. 1);
The test of braid over braid linear mass is 1m with the work effective dimensions of sample;
The pre-tension value of dry state sample warp or broadwise single thread fracture strength and breaking elongation test usefulness equals the deadweight of identical rugosity synthon single thread 250m length, and the pre-tension of hygrometric state sample warp or broadwise single thread fracture strength and breaking elongation test usefulness equals the deadweight of identical rugosity 125m synthon single thread length;
The total radical of warp thread of braid over braid specimen width direction is N
1, the total radical of weft yarn in the every cm width of length direction is N
2The pre-tension value of dry state sample braid over braid ultimate strength and breaking elongation test usefulness equals identical rugosity synthon single thread 250N
1The deadweight of Mi Changdu, the pre-tension of hygrometric state sample braid over braid warp-wise ultimate strength and breaking elongation test usefulness equals identical rugosity 125N
1The deadweight of rice synthon single thread length;
The braid over braid linear measure longimetry is carried out in smooth, dry place;
The average rupture time of single thread sample is (20 ± 3) s, and the draw speed when the braid over braid sample stretches is 100mm/min;
The sample data that will skid at the anchor clamps place is removed, and other gets a sample and tests again; When carrying out single thread or braid over braid extension test, allow the lining underbed in the grip of testing machine, to avoid sample to crush or slippage;
Sampling and sample preparation: randomly draw the processing braid over braid and adorn single thread with 20 (strand), should earlier an end of single thread be removed 50m before every (strand) single thread sampling, again with thread yarn horizontal metroscope obtain test through or broadwise single thread line density single thread 100.000m, with this as through or broadwise single thread line density test and use sample;
20 (strand) dress through (or latitude) after carrying out single thread line density sampling on the single thread, again every (strand) single thread respectively clip length be at least 1 of the single thread that 1m grows, be used for through or the test of broadwise single thread ultimate strength and breaking elongation;
Take out the identical finished product braid over braid of nominal length 20 volumes at random, be used for the braid over braid length measurment; Loose for preventing to cut off braid over braid termination, back, cut off the termination of braid over braid and should carry out melt process;
Behind 20 volume braid over braid length measurments, clip length is 3 of the long braid over braids of 1m locating more than apart from braid over braid one end 5m respectively on every volume braid over braid, wherein 1 be used for braid over braid width and Determination of thickness, 1 be used for braid over braid through the mensuration of close and filling density, 1 mensuration that is used for the braid over braid unit weight;
For the braid over braid below the rated load 0.5kN, behind 20 volume braid over braid length measurments, clip length is 1 of the long braid over braid of 1m locating more than apart from braid over braid one end 5m respectively on every volume braid over braid, and this braid over braid sample is directly used in that INSTRON4466 type strength tester carries out the braid over braid ultimate strength and breaking elongation is measured;
For the braid over braid more than the rated load 0.5kN, behind 20 volume braid over braid length measurments, clip length is 1 of the long braid over braid of 3.12m locating more than apart from braid over braid one end 5m respectively on every volume braid over braid, RHZ-1600 type strength tester carries out ultimate strength and breaking elongation is measured but this braid over braid not directly is used for, when carrying out the braid over braid extension test, adopts RHZ-1600 type strength tester fixedly flat soft ring (Fig. 1 at sample two ends of the cylindrical pin of diameter 0.12m (7 among Fig. 4), in 4 1), so, as braided wire flat soft ring (Fig. 1 is carried out at the two ends of the long braid over braid of above-mentioned 3.12m with the high-strength nylon multifilament threads, in 4 1) make, long 0.30m in the soft ring of making, the seam length 0.20m of braid over braid length direction, seam crossing should be smooth, the effective length (Fig. 1) of making the soft ring sample of back two ends band is 2.00m, and the length (Fig. 4) during test between the two anchor clamps pin central points is 1.88m;
The time do not allow the direction serial sampling that is stretched at sample carrying out the same project test, but when cutting dried, hygrometric state sample simultaneously, must cut two samples continuously in the direction that sample is stretched, and mark letter w S distinguishes dry state sample and hygrometric state sample on the alphabetical DS of mark, hygrometric state sample on the dry state sample at every turn;
Fish for and fishery engineering single layer weaving belt geometry and mechanics performance determining method:
Weigh in the balance to such an extent that the processing braid over braid is M (g) with the quality that 100.000m grows warp or broadwise single thread, then the line density of warp or broadwise single thread is 10M (tex);
Pneumatic flat mouthful of anchor clamps (3 among Fig. 2,5) before measuring, warp or broadwise single thread ultimate strength and breaking elongation are installed on INSTRON 4466 type strength testers, the length of sample between anchor clamps (4 among Fig. 2) is 500mm, (the pre-tension value of dry state sample equals the deadweight of identical rugosity single thread 250m length to apply suitable pre-tension, the pre-tension of hygrometric state sample equals the deadweight of identical rugosity single thread 125m length), be in (20 ± 3) s the single thread sample to be stretched until single thread fracture, the ultimate strength F of single thread sample at average rupture time then
t(N) and breaking elongation ε
d(%) value record and calculate from the pen recorder of testing machine, then the ultimate strength of unit line density be through or the fracture strength F of broadwise single thread
d(N/tex), the fracture strength F of single thread
dCalculate (1) as follows:
In the formula: F
d-through (or latitude) fracture strength (N/tex) to single thread;
F
t-through (or latitude) ultimate strength (N) to single thread;
M-100.000m is long through (or latitude) quality (g) to single thread.
During the braid over braid length measurment braid over braid is positioned on smooth, the dry place, shakeout and make braid over braid fully to stretch, from an end of braid over braid, with the continuous coverage of 10m tape order till the other end of braid over braid, the straight-line dimension that it constituted, i.e. braid over braid length; Every volume braid over braid is measured once, is accurate to 1mm;
Behind the braid over braid length measurment, more than distance braid over braid one end 5m, locate clip length and be 1 of the long braid over braid of 1m, with the width D (mm) of vernier caliper measurement braid over braid, with the thickness H (mm) of micron miking braid over braid; Every volume braid over braid is measured once, is accurate to 0.02mm;
Behind the braid over braid length measurment, locating clip length more than distance braid over braid one end 5m is 1 of the long braid over braid of 1m, is used for braid over braid through close and mensuration filling density; Remove braid over braid part weft yarn, the total radical of checking in the whole width of braid over braid (D) of warp thread is N
1, then braid over braid through close be 10N
1/ D (root/cm); Accurately measure the long braid over braid of 1cm with vernier caliper, remove braid over braid part warp thread, the total radical of checking in the every cm width of braid over braid warp direction of weft yarn is N
2, then the braid over braid filling density is N
2(root/cm); Every volume braid over braid is measured once;
Behind the braid over braid length measurment, locating clip length more than distance braid over braid one end 5m is 1 of the long braid over braid of 1.000m, is used for the mensuration of braid over braid unit weight; Weigh the quality P (g) that gets the long braid over braid of 1m in the balance, be accurate to 0.01g, then the braid over braid unit weight is P (g/m); Every volume braid over braid is measured once;
Be that the termination of braid over braid is loose after preventing to cut off during sampling, should carry out melt process the termination of cutting off braid over braid;
For the braid over braid below the rated load 0.5kN, adopt INSTRON 4466 type strength testers to carry out braid over braid ultimate strength and breaking elongation mensuration, measuring preceding is pneumatic flat mouthful of anchor clamps more than the 60mm in that width is installed on the strength tester, distance between anchor clamps is adjusted into 200mm, one end of sample (6 among Fig. 3) Width is all entirely sandwiched anchor clamps (3 among Fig. 3), the other end of sample (6 among Fig. 3) Width in addition specific pre-tension (the pre-tension value of dry state sample equals identical rugosity single thread 250 N
1The deadweight of Mi Changdu, the pre-tension of hygrometric state sample equal identical rugosity 125 N
1The deadweight of rice single thread length) sandwiches down pneumatic flat mouthful of anchor clamps (5 among Fig. 3) after, under the draw speed of 100mm/min, the braid over braid sample is stretched until fracture (the sample data removal that will skid at the anchor clamps place, other gets a sample and tests again), the ultimate strength F (N) of sample and breaking elongation ε (%) value record and calculating from the pen recorder of testing machine;
For the braid over braid more than the rated load 0.5kN, adopt RHZ-1600 type strength tester to carry out braid over braid ultimate strength and breaking elongation mensuration, RHZ-1600 type strength tester adopts the fixedly flat soft ring at sample two ends (1 among Fig. 4) of cylindrical pin (7 among Fig. 4) when carrying out extension test, testing machine is loaded on pre-tension and writes down the length L of braid over braid sample under pre-tension
3, under the draw speed of 100mm/min, the braid over braid sample is stretched until fracture the length L when reading the fracture of ultimate strength value and F (N) record
4And fracture location, then the breaking elongation ε (%) of braid over braid sample is (L
4-L
3)/L
3* 100%; Fracture strength utilization factor η (%) (2) calculating as follows of warp-wise single thread of processing braid over braid:
In the formula: the fracture strength utilization factor (%) of η-warp-wise single thread;
The ultimate strength of F-braid over braid (N);
F
tThe ultimate strength of-warp-wise single thread (N);
N
1The total radical of warp thread of-braid over braid specimen width direction.
Above-mentioned test is effectively measured time number average and is no less than 20 times, and calculate do, braid over braid length under the hygrometric state, width, thickness, through arithmetic mean, irregularity and the coefficient of variation of the fracture strength utilization factor correspondence of the fracture strength of the fracture strength of close, filling density, unit weight, warp-wise single thread and breaking elongation, broadwise single thread and breaking elongation, braid over braid ultimate strength and breaking elongation, warp-wise single thread; The irregularity of tested physical index, the coefficient of variation (3), (4) are as follows calculated:
In the formula: C-irregularity;
X-tested physical index arithmetical mean (getting three decimals);
The average (getting three decimals) that y-tested physical index arithmetical mean is following;
N-sample number;
n
1The sample number that-tested physical index arithmetical mean is following.
In the formula: CV-coefficient of variation;
S-standard deviation (getting three decimals);
The mean value of x-measured value (getting three decimals).
What this method was more complete tests braid over braid geometry and mechanical performance index from multi-angle, meet the materialogy theory, and utilize irregularity, the coefficient of variation that the degree of irregularity and the total quality of braid over braid product index are passed judgment on, method is practical, effectively simple and clear, rationally reliable, for choosing or design the braid over braid material, the fishery engineering technician provides reliable basis.This assay method except that be applicable to fish for fishery engineering with the single layer weaving belt, also be applicable to the detection and the quality assessment of single layer weaving belt geometry such as book strap, shoulder backpack strip, field article band, notebook backpack strip, hand-strap, neck are linked with, shoulder harness, camera harness and mechanical property, range of application is quite wide.
Claims (1)
1. single layer weaving belt for fishing geometry and mechanics performance determining method, comprise through or the sampling of broadwise single thread sample, the sampling of braid over braid sample and processing, sample damping balance, single thread and the braid over braid strength test mode of termination thereof, it is characterized in that the single thread sample is obtained at the above place of the terminal 50m of distance single thread, the braid over braid sample is obtained at the above place of the terminal 5m of distance braid over braid, when cutting dried, hygrometric state sample simultaneously, must cut two samples continuously in the direction that sample is stretched at every turn; The work effective dimensions of sample is chosen by test event: it is long for 100m to be used for the test of single thread line density, being used for the braid over braid length testing is 1 volume, be used for braid over braid width, thickness, long for 1m through close, filling density, unit weight, warp or broadwise single thread fracture strength and breaking elongation test, be used for following braid over braid ultimate strength of rated load 0.5kN and breaking elongation test and be 1m length, the effective length that is used for the soft ring sample of two ends band of above braid over braid ultimate strength of rated load 0.5kN and breaking elongation test is that 2m is long; Melt process is carried out with the thawing method in the termination of cutting off braid over braid; The dry state sample soaks 24h at least in the 24h of damping balance at least under the atmospheric conditions of temperature (20 ± 2) ℃, humidity (65 ± 3) %, the hygrometric state sample container in water temperature (20 ± 2) ℃; When measuring, warp or broadwise single thread ultimate strength and breaking elongation in the upper and lower pneumatic flat mouthful of anchor clamps of strength tester, sample is installed, the pre-tension that the dry state sample is applied equals the deadweight of identical rugosity single thread 250m length, the pre-tension that the hygrometric state sample is applied equals the deadweight of identical rugosity single thread 125m length, behind average rupture time (20 ± 3) s that satisfies regulation the single thread sample is stretched until the single thread fracture, the ultimate strength of single thread sample and elongation at break values write down from the pen recorder of testing machine and calculate; During the braid over braid length measurment braid over braid is positioned on smooth, the dry place, shakeouts and make braid over braid fully to stretch, from an end of braid over braid, the order continuous coverage is till the other end of braid over braid, and the straight-line dimension that it constituted is braid over braid length; Use width, the thickness of vernier caliper, micron miking braid over braid respectively; Braid over braid through or filling density remove braid over braid part latitude or warp thread when measuring, check warp or the total radical of weft yarn in every cm width, calculate braid over braid through close or filling density; Weigh the quality of getting 1m first draft ribbon in the balance, calculate the braid over braid unit weight; For the braid over braid below the rated load 0.5kN, adopting strength tester to carry out braid over braid ultimate strength and breaking elongation is pneumatic flat mouthful of anchor clamps more than the 60mm in that width is installed on the testing machine before measuring, one end of specimen width direction is all entirely sandwiched anchor clamps, sandwich pneumatic down flat mouthful of anchor clamps after the other end of specimen width direction adds pre-tension, the pre-tension value of dry state sample equaled identical rugosity single thread 250N when the braid over braid ultimate strength was measured
1(N
1Be the total radical of warp thread of braid over braid specimen width direction) deadweight of Mi Changdu, the pre-tension of hygrometric state sample equals identical rugosity 125N
1The deadweight of rice single thread length stretches until fracture to sample under the 100mm/min draw speed, and the ultimate strength of sample and elongation at break values write down from the pen recorder of testing machine and calculate; For the braid over braid more than the rated load 0.5kN, adopt the fixedly flat soft ring at sample two ends of cylindrical pin when adopting strength tester to carry out braid over braid ultimate strength and breaking elongation mensuration, testing machine is loaded on pre-tension and writes down the length of braid over braid sample under pre-tension, under 100mm/min speed the braid over braid sample is stretched until fracture, the ultimate strength of sample and elongation at break values write down from the pen recorder of testing machine and calculate; Test is effectively measured time number average and is no less than 20 times.
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Cited By (3)
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| CN106124314A (en) * | 2016-06-13 | 2016-11-16 | 信泰(福建)科技有限公司 | A kind of warp knit screen cloth chemical fibre detection method |
| CN111157369A (en) * | 2019-12-09 | 2020-05-15 | 北京空间机电研究所 | Load obtaining method for parachute falling-out test |
| CN113654895A (en) * | 2021-09-09 | 2021-11-16 | 哈尔滨工业大学 | Method for obtaining I-type fracture toughness in three-dimensional woven composite material fiber bundle |
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2007
- 2007-08-06 CN CN2007100446008A patent/CN101363784B/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106124314A (en) * | 2016-06-13 | 2016-11-16 | 信泰(福建)科技有限公司 | A kind of warp knit screen cloth chemical fibre detection method |
| CN111157369A (en) * | 2019-12-09 | 2020-05-15 | 北京空间机电研究所 | Load obtaining method for parachute falling-out test |
| CN111157369B (en) * | 2019-12-09 | 2022-04-08 | 北京空间机电研究所 | Load obtaining method for parachute falling-out test |
| CN113654895A (en) * | 2021-09-09 | 2021-11-16 | 哈尔滨工业大学 | Method for obtaining I-type fracture toughness in three-dimensional woven composite material fiber bundle |
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