CN110715852A - Method for testing anti-fracture performance of lap joint of bamboo split roll - Google Patents
Method for testing anti-fracture performance of lap joint of bamboo split roll Download PDFInfo
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- CN110715852A CN110715852A CN201910809320.4A CN201910809320A CN110715852A CN 110715852 A CN110715852 A CN 110715852A CN 201910809320 A CN201910809320 A CN 201910809320A CN 110715852 A CN110715852 A CN 110715852A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0017—Tensile
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/006—Crack, flaws, fracture or rupture
- G01N2203/0067—Fracture or rupture
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/025—Geometry of the test
- G01N2203/0252—Monoaxial, i.e. the forces being applied along a single axis of the specimen
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/067—Parameter measured for estimating the property
- G01N2203/0676—Force, weight, load, energy, speed or acceleration
Abstract
The invention discloses a method for testing the lap joint fracture resistance of a bamboo split roll, which comprises the following steps: cutting at least 2 samples to be tested from a plurality of rolls of bamboo skin rolls, wherein the samples to be tested comprise an upper roll, a lower roll and a lap joint surface; taking the lap joint as a center, clamping two ends of a bamboo split roll to two ends of a clamp respectively, installing the clamped bamboo split roll on a tensile testing machine, uniformly and continuously loading a sample until the sample is broken, and reading and recording the breaking force F during the breaking; the method comprises the steps of judging whether the lap fracture force F of each sample is larger than or equal to Fm or smaller than Fm, recording the sample quantity S of F smaller than Fm in a bamboo split roll, comparing the S with the M, judging that the bamboo split roll is qualified when the S is smaller than or equal to M, otherwise, judging that the bamboo split roll is unqualified, wherein Fm is the set minimum value of the lap fracture force, and M is the maximum quantity of performance in a test sample which does not reach the standard when the sample is qualified.
Description
Technical Field
The invention belongs to the technical field of bamboo split rolls, and particularly relates to a method for testing the lap joint fracture resistance of a bamboo split roll.
Background
The bamboo material is a renewable green environment-friendly material, the application of the bamboo composite material is more and more extensive, and the bamboo composite pressure pipe can generally replace traditional pipelines such as polyvinyl chloride pipes, polyethylene pipes, glass steel pipes, cement pipes, spiral welding pipes, nodular cast iron and the like in drainage engineering, farmland irrigation, petrochemical engineering corrosion prevention and other occasions along with the increasing maturity of the related technologies of the bamboo composite pressure pipe in recent years, so that the bamboo composite pressure pipe has a good application prospect.
The compound pressure pipe of bamboo is by the overlap joint of bamboo combined material, the winding forms, because there is the overlap joint, the compound performance of bamboo can receive the influence of the lapped firm degree of thin bamboo strips used for weaving, in order to guarantee the compound pressure pipe of bamboo performance when the later stage is used the condition such as damaged fracture does not appear, need roll up lapped fracture force to thin bamboo strips used for weaving and test before making compound pressure pipe of bamboo, and do not have one kind among the prior art simply effective, and comparatively accurate be used for judging, detect the thin bamboo strips used for weaving and roll up the method of overlap fracture force.
Patent CN104764661A discloses a test device and a test method for measuring mechanical properties of an overlapped sample, the test device includes a clamp for clamping the overlapped sample, two cover plates for fixing the overlapped sample on the clamp, and two loading heads for connecting the test device and the equipment; the test method is characterized in that a lap joint sample to be tested is clamped by matching two clamps, and is connected and loaded with test equipment through a loading head, so that the mechanical properties of the sample, such as shearing resistance, bending resistance, torsion resistance or tensile resistance, are tested. However, the bamboo composite pressure pipe is a pipe manufactured by using bamboo as a base material, thermosetting resin as an adhesive and a winding process, and is greatly influenced by a weaving and winding process, and the fracture resistance of different lap joint modes is different, so that the fracture resistance of the bamboo composite pressure pipe cannot be comprehensively, accurately and really reflected by the detection of the existing test method for the mechanical property of the lap joint sample.
Disclosure of Invention
Aiming at the defects or the improvement requirements in the prior art, the invention provides a method for testing the lap joint fracture resistance of a bamboo split roll, which comprises the steps of cutting more than 2 samples to be tested from a plurality of rolls of bamboo split rolls, ensuring that the samples are provided with an upper roll, a lower roll and a lap joint surface, fixing the samples on a clamp, continuously and uniformly loading the samples on a tensile testing machine until the samples are fractured, comparing the recorded fracture force F with a preset minimum value Fm of the lap joint fracture force, recording the number S of the samples with the F being less than the Fm, and determining whether the lap joint fracture resistance of the bamboo split roll is qualified or not by comparing the size of the S and the size of the M.
In order to achieve the purpose, the invention provides a method for testing the lap joint fracture resistance of a bamboo split roll, which comprises the following steps:
s1 preparation of samples: cutting at least 2 samples to be tested from a plurality of rolls of bamboo skin rolls, wherein the cut samples to be tested comprise an upper roll, a lower roll and a lap joint surface;
s2 tensile test: taking the lap joint as a center, clamping two ends of a bamboo split roll to two ends of a clamp respectively, installing the clamped bamboo split roll on a tensile testing machine, uniformly and continuously loading a sample until the sample is broken, and reading and recording the breaking force F during the breaking;
s3, judging whether the fracture resistance of the bamboo split roll is qualified: judging whether the lap fracture force F of each sample is larger than or equal to Fm or smaller than Fm, recording the quantity S of the samples with F smaller than Fm in the bamboo skin roll, comparing S with M, judging that the bamboo skin roll is qualified when S is smaller than or equal to M, otherwise, judging that the bamboo skin roll is unqualified,
wherein Fm is a set minimum value of lap fracture force
And M is the maximum number of unqualified performance in the test sample when the sample is qualified.
Further, in step S1, N samples to be measured are cut out from the N bamboo split rolls:
wherein, when N is more than or equal to 1 and less than or equal to 90, N is 5;
91≤N≤150，n＝8；
when N is more than or equal to 151 and less than or equal to 500, N is 13;
when N is more than or equal to 501 and less than or equal to 1200, N is 20;
when N is more than or equal to 1201 and less than or equal to 3200, N is 32;
3201. ltoreq.N, where N is 3200X + y (1. ltoreq. y < 3200), N32X + N '(1. ltoreq. y.ltoreq.90, N' 5, 91. ltoreq. y.ltoreq.150, N '8, 151. ltoreq. y.ltoreq.500, N' 13, 501. ltoreq. y.ltoreq.1200, N '20, 1201. ltoreq. y.ltoreq.3200, N' 32)
Further, in step S1, the length of the cut sample to be tested is L, and the overlapping length of the overlapping surface is L/10-L/8.
Further, in step S1, the overlapping lines of the overlapping surfaces are parallel to the cutting line planes at the two ends of the sample.
Further, the axial distance between the clamps for clamping the upper roll and the lower roll is less than or equal to the width of the single bamboo split roll.
Further, when the sample is loaded, the sample is uniformly and continuously loaded at a loading speed of 3-7 mm/min.
Furthermore, the setting of Fm is related to the sewing line, the lap joint width and the material of the bamboo split roll, and Fm is more than or equal to 2500N.
Further, the relationship between n and M is specifically: when n is 5, M is 1; when n is 8, M is 1; when n is 13, M is 2; when n is 20, M is 3; when n is 32, M is 5.
In general, compared with the prior art, the above technical solution contemplated by the present invention can achieve the following beneficial effects:
(1) the invention discloses a method for testing lap joint fracture resistance of a bamboo split roll, which comprises the steps of cutting more than 2 samples to be tested from a plurality of rolls of bamboo split rolls, ensuring that the samples are provided with an upper roll, a lower roll and a lap joint surface, fixing the samples on a clamp, continuously and uniformly loading the samples on a tensile testing machine until the samples are fractured, comparing a recorded fracture force F with a preset minimum value Fm of the lap joint fracture force, recording the number S of the samples with the F being less than the Fm, and determining whether the lap joint fracture resistance of the bamboo split roll is qualified or not by comparing the S with the M.
(2) According to the method for testing the lap joint fracture resistance of the bamboo skin roll, the lap joint length of the lap joint surface is L/10-L/8, the proportion of the lap joint length in the sample length cannot be too large, the proportion is large, firstly, the clamping is inconvenient, secondly, the fracture resistance cannot be truly embodied, and the fracture force measured by the proportion is smaller than the actual fracture force of the bamboo skin roll; the proportion of the lap joint length in the length of the sample cannot be too small, the length of the bamboo splits selected in a small proportion is very long, the material is not convenient to clamp and is wasted, the L/10-L/8 sample is taken, the sample can be clamped better, other influence factors can be avoided being added during the fracture resistance test, and the detection accuracy is guaranteed.
(3) According to the method for testing the lap joint fracture resistance of the bamboo skin roll, the lap joint line is parallel to the cutting line planes at two ends of the sample. Thereby the lap joint line is parallel with the line of cut-out and guarantees to cut out the thin bamboo strips used for weaving piece of a regular symmetry, the centre gripping of not only being convenient for, also makes the overlap joint be located central point after the centre gripping simultaneously and puts, thereby guarantees that the stress of overlap joint both sides is the same can more truly accurately embody the fracture resistance that thin bamboo strips used for weaving was rolled up.
Drawings
FIG. 1 is a schematic view of a structure of a jig in an embodiment of the invention;
fig. 2 is a side view of a clamp in an embodiment of the invention.
In all the figures, the same reference numerals denote the same features, in particular: 1-upper pull rod, 2-lower pull rod, 3-bamboo strip roll and 4-splint.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Examples
First, a sample was prepared. Cutting a sample to be tested with the length of L along the length direction of the bamboo split roll to be tested, cutting N samples to be tested from the N bamboo split rolls, wherein the cut samples to be tested need to comprise an upper roll, a lower roll and a lap joint surface;
preferably (optimal number of samples obtained from multiple trials):
when N is more than or equal to 1 and less than or equal to 90, N is 5;
91≤N≤150，n＝8；
when N is more than or equal to 151 and less than or equal to 500, N is 13;
when N is more than or equal to 501 and less than or equal to 1200, N is 20;
when N is more than or equal to 1201 and less than or equal to 3200, N is 32;
3201. ltoreq.N, where N is 3200X + y (1. ltoreq. y < 3200), N32X + N '(1. ltoreq. y.ltoreq.90, N' 5, 91. ltoreq. y.ltoreq.150, N '8, 151. ltoreq. y.ltoreq.500, N' 13, 501. ltoreq. y.ltoreq.1200, N '20, 1201. ltoreq. y.ltoreq.3200, N' 32)
Further, the lapping center line of the lapping surface is ensured to be positioned at the center of the sample to be measured, and the lapping line is parallel to the cutting line planes at the two ends of the sample. Thereby the lap joint line is parallel with the line of cut-out and guarantees to cut out the thin bamboo strips used for weaving piece of a regular symmetry, the centre gripping of not only being convenient for, also makes the overlap joint be located central point after the centre gripping simultaneously and puts, thereby guarantees that the stress of overlap joint both sides is the same can more truly accurately embody the fracture resistance that thin bamboo strips used for weaving was rolled up.
Preferably, the lapping length of the lapping surface is L/10-L/8, the ratio of the lapping length to the sample length cannot be too large, the large ratio is inconvenient to clamp, and the fracture resistance cannot be truly embodied, because the fracture force measured by the large ratio is smaller than the actual fracture force of the bamboo split roll; the proportion of the lap joint length in the length of the sample cannot be too small, the length of the selected bamboo splits can be very long, and the clamping test is inconvenient and the material is wasted.
Next, a tensile test was conducted. As shown in fig. 1 and 2, the clamp comprises an upper pull rod 1, a lower pull rod 2 and a clamping plate 4, the bamboo split roll takes the lap joint as the center, two ends of the bamboo split roll are respectively placed at two ends of the clamp, and the bamboo split roll is clamped by the clamping plate and then is compressed by a screw; the clamping fixture is installed on a tensile testing machine after being clamped well by the fixture, wherein the clamping mode of the fixture is that the fixture laterally contacts with the surface of the tensile testing machine, and the axial distance (eccentricity) between an upper clamping fixture and a lower clamping fixture is less than or equal to the width of a single bamboo split roll.
The sample is then uniformly and continuously loaded until it breaks, and the breaking force F at break is read and recorded.
Preferably, the sample is loaded uniformly and continuously at a loading speed of 3-7 mm/min.
More preferably, a sample length of 400mm is selected, wherein the overlap length is 50mm and the grip length is 40 mm.
And then, judging whether the fracture resistance of the bamboo split roll is qualified.
Judging whether the lap fracture force F of each sample is larger than or equal to Fm or smaller than Fm, recording the sample quantity S of F smaller than Fm in the bamboo split roll,
when F is larger than or equal to Fm, the fracture resistance of the sample is qualified; when F is less than Fm, the fracture resistance of the sample is unqualified;
when the quantity of the Fm samples is less than F and exceeds M, judging that the bamboo skin roll is unqualified, otherwise, judging that the bamboo skin roll is qualified;
wherein Fm is the set minimum value of the lap fracture force,
and M is the maximum number of unqualified performance in the test sample when the sample is qualified.
The relationship among the number of the bamboo splits rolls, the number of the test samples and the unqualified number of the samples is as follows (the optimal number of the test samples and the M value are obtained according to the statistics of a plurality of tests):
| number of bamboo splits rolled | Number of samples tested | M |
| 0-90 | 5 | 1 |
| 91-150 | 8 | 1 |
| 151-280 | 13 | 2 |
| 281-500 | 13 | 2 |
| 501-1200 | 20 | 3 |
| 1201-3200 | 32 | 5 |
When the number of the bamboo split rolls is more than 3200, the bamboo split rolls are divided into 3200 parts and 3200 parts, and if the number of the test samples of each bamboo split roll is qualified, the bamboo split roll can be calculated to be qualified.
Furthermore, the setting of Fm is related to the seam, the lap joint width and the material of the bamboo split roll, and the Fm is required to be more than or equal to 2500N.
The specific test experimental data are as follows:
test experiment 1: one batch of the 115-roll bamboo skin rolls requires the minimum breaking force to be 2500N, the number of the test samples is 8, and the test data are respectively as follows: 2561N, 2473N, 2633N, 2487N, 2588N, 2655N, 2566N, 2612N, where the number of required test failures M is 1, in fact 2, failures.
Test experiment 2: one batch of 210 bamboo skin rolls requires the minimum breaking force to be 2500N, the number of test samples is 13, and the test data are respectively as follows: 2533N, 2540N, 2621N, 2887N, 2456N, 2618N, 2563N, 2535N, 2588N, 2535N, 2716N, 2672N, 2532N, wherein the number M of the required test failures is 2, actually 1, and is qualified.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (8)
1. A method for testing the lap joint fracture resistance of a bamboo split roll is characterized by comprising the following steps:
s1 preparation of samples: cutting at least 2 samples to be tested from a plurality of rolls of bamboo skin rolls, wherein the cut samples to be tested comprise an upper roll, a lower roll and a lap joint surface;
s2 tensile test: taking the lap joint as a center, clamping two ends of a bamboo split roll to two ends of a clamp respectively, installing the clamped bamboo split roll on a tensile testing machine, uniformly and continuously loading a sample until the sample is broken, and reading and recording the breaking force F during the breaking;
s3, judging whether the fracture resistance of the bamboo split roll is qualified: judging whether the lap fracture force F of each sample is larger than or equal to Fm or smaller than Fm, recording the quantity S of the samples with F smaller than Fm in the bamboo skin roll, comparing S with M, judging that the bamboo skin roll is qualified when S is smaller than or equal to M, otherwise, judging that the bamboo skin roll is unqualified,
wherein Fm is a set minimum value of lap fracture force
And M is the maximum number of unqualified performance in the test sample when the sample is qualified.
2. The method for testing the lap joint fracture resistance of the bamboo split roll according to claim 1, wherein in step S1, N samples to be tested are cut from N rolls of bamboo split rolls:
wherein, when N is more than or equal to 1 and less than or equal to 90, N is 5;
91≤N≤150，n＝8；
when N is more than or equal to 151 and less than or equal to 500, N is 13;
when N is more than or equal to 501 and less than or equal to 1200, N is 20;
when N is more than or equal to 1201 and less than or equal to 3200, N is 32;
3201. ltoreq.N, N is classified into 3200x + y (1. ltoreq. y < 3200), N32 x + N '(1. ltoreq. y.ltoreq.90, N' 5, 91. ltoreq. y.ltoreq.150, N '8, 151. ltoreq. y.ltoreq.500, N' 13, 501. ltoreq. y.ltoreq.1200, N '20, 1201. ltoreq. y.ltoreq.3200, N' 32).
3. The method for testing the lap joint fracture resistance of the bamboo split roll according to claim 1, wherein in step S1, the length of the cut sample to be tested is L, and the lap joint length of the lap joint surface is L/10-L/8.
4. The method for testing the lap joint fracture resistance of the bamboo split roll according to any one of claims 1 to 3, wherein in the step S1, the lap joint line of the lap joint surface is parallel to the cutting line plane at two ends of the sample.
5. The method for testing the lap joint fracture resistance of the bamboo split roll according to claim 1, wherein in the step S2, an axial distance between the clamps for clamping the upper roll and the lower roll is less than or equal to the width of a single bamboo split roll.
6. The method for testing the lap joint fracture resistance of the bamboo split roll according to claim 1, wherein in the step S2, the sample is loaded uniformly and continuously at a loading speed of 3-7 mm/min.
7. The method for testing the lap joint fracture resistance of the bamboo split roll as claimed in claim 1, wherein in step S3, Fm is set according to the seam, the lap joint width and the material of the bamboo split roll, and Fm is greater than or equal to 2500N.
8. The method for testing the lap joint fracture resistance of the bamboo split roll according to claim 2, wherein the relation between n and M is specifically as follows: when n is 5, M is 1; when n is 8, M is 1; when n is 13, M is 2; when n is 20, M is 3; when n is 32, M is 5.
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| CN201910809320.4A CN110715852A (en) | 2019-08-29 | 2019-08-29 | Method for testing anti-fracture performance of lap joint of bamboo split roll |
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| CN201910809320.4A CN110715852A (en) | 2019-08-29 | 2019-08-29 | Method for testing anti-fracture performance of lap joint of bamboo split roll |
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- 2019-08-29 CN CN201910809320.4A patent/CN110715852A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112630021A (en) * | 2020-11-25 | 2021-04-09 | 惠州亿纬锂能股份有限公司 | Method for testing battery core sleeve label |
| CN113447356A (en) * | 2021-07-12 | 2021-09-28 | 广州白云山星群(药业)股份有限公司 | Method and equipment for testing mechanical properties of soft capsule shell |
| CN113447356B (en) * | 2021-07-12 | 2022-02-18 | 广州白云山星群(药业)股份有限公司 | Method and equipment for testing mechanical properties of soft capsule shell |
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Effective date of registration: 20230109 Address after: 311122 No. 29-16, Jiaqi Road, Xianlin Street, Yuhang District, Hangzhou, Zhejiang Applicant after: Zhonglin Xinzhou Bamboo Winding Development Co.,Ltd. Address before: 311251 No.1, dongfanzhong Road, Linpu Town, Xiaoshan District, Hangzhou City, Zhejiang Province Applicant before: ZHEJIANG XINZHOU BAMBOO-BASED COMPOSITES TECHNOLOGY Co.,Ltd. Applicant before: Ye Ling |
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