CN103091168A - Corn kernel Poisson's ratio determining method - Google Patents
Corn kernel Poisson's ratio determining method Download PDFInfo
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- CN103091168A CN103091168A CN2013100377450A CN201310037745A CN103091168A CN 103091168 A CN103091168 A CN 103091168A CN 2013100377450 A CN2013100377450 A CN 2013100377450A CN 201310037745 A CN201310037745 A CN 201310037745A CN 103091168 A CN103091168 A CN 103091168A
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Abstract
The invention relates to the technical field of modern agriculture testing, and particularly relates to a corn kernel Poisson's ratio determining method which comprises the following steps of: preparing a to-be-determined corn kernel sample; fixing a determining strain gage; welding a lead with the strain gage; and determining a strain value of loading and compressing the to-be-determined sample. The corn kernel Poisson ratio determining method has the advantages of simple and convenient operation steps, scientific measurement principle, reliable Poisson ratio measurement result and low production cost.
Description
Technical field
The present invention relates to the modern agriculture technical field of measurement and test, relate in particular to a kind of corn kernel Poisson ratio assay method.
Background technology
In recent years, along with the development of agricultural science and technology, there are many scholars to use the mechanical property that Finite Element Method is studied agricultural material both at home and abroad.Adopt finite element method simulation fruits and vegetables, crop seed stand under load process, analyze its Micromechanics characteristic and injuring rule significant.Therefore, the selection of each characteristic parameter value will be directly connected to the correctness of analog result in the agricultural material modeling process.The report of relevant corn kernel modeling and Poisson ratio mensuration is actually rare at home, Li Xinping, Gao Lianxing etc. 2007 do not see concrete assay method with reference to directly having determined the Poisson ratio of corn kernel after relevant " finite element analysis of corn particle internal stress in dry run " in pertinent literature.
Summary of the invention
The object of the invention is to avoid the deficiencies in the prior art that a kind of corn kernel Poisson ratio assay method is provided.Can accurately obtain the corn kernel Poisson ratio, and make analog result undistorted.
For achieving the above object, the technical scheme that the present invention takes is: a kind of corn kernel Poisson ratio assay method, and its principal feature is to comprise the following steps:
Step 1: the preparation of corn kernel sample to be measured: use grain moisture measuring apparatus corn kernel is carried out measurement of water-content coefficient, by vernier caliper, corn kernel is measured, choose length greater than 12mm, width is greater than 10mm, and thickness carries out sample production greater than the corn kernel of 4mm.Use 240 orders-320 order sand paper to roughly grind, re-use 360 order sand paper to selected corn kernel and finish grind, corn kernel is worn into the rectangular specimen of 9mm * 9mm * 3mm;
Step 2: measure foil gauge and fix: corn kernel embryo horizontal direction is defined as laterally, vertically, laterally with Instant cement, resistance strain gage is pasted along embryo respectively on seed sample two sides and fixed;
Step 3: wire and foil gauge welding: select the different colours stranded conductor, respectively on wire bonds is horizontal to the corn kernel embryo, resistance strain gage that vertically paste;
Step 4: the strain value when sample to be tested loads compression is measured: the foil gauge wire other end of pasting on sample to be tested is connected to the static strain analyzer, again sample is positioned on microcomputer controlled electronic universal tester, carries out the axial compression test of corn kernel; Record is vertical, the transverse strain value, calculates the Poisson ratio of corn kernel.
Described a kind of corn kernel Poisson ratio assay method, described microcomputer controlled electronic universal tester is 30N-150N to the axial compression load of corn kernel sample.
Described a kind of corn kernel Poisson ratio assay method, the axial loading velocity of described microcomputer controlled electronic universal tester is 1mm/min-3mm/min.
Described a kind of corn kernel Poisson ratio assay method, described corn kernel Poisson ratio are the mean value of getting the relevant Poisson ratio of corn kernel that each compressive load calculates under pressure head 1mm/min-3mm/min loading velocity.
The invention has the beneficial effects as follows: simplified operational procedure of the present invention, the measuring principle science, the Poisson ratio measurement result is reliable, and investment cost is low, can accurately obtain the Poisson ratio of the corn kernel under the different qualities parameter, will provide technical guarantee for the authenticity of agricultural material modeling and analog result.
Description of drawings
Fig. 1 a is the corn kernel rectangular specimen front elevation of making after corase grind, fine grinding;
Fig. 1 b is the corn kernel rectangular specimen rear view of making after corase grind, fine grinding;
Fig. 2 a is the horizontal fixed form of foil gauge during the corn kernel Poisson ratio is measured;
Fig. 2 b is the vertical fixed form of foil gauge during the corn kernel Poisson ratio is measured;
Fig. 3 a is transverse strain sheet wire bonds mode during the corn kernel Poisson ratio is measured;
Fig. 3 b is longitudinal strain sheet wire bonds mode during the corn kernel Poisson ratio is measured.
Embodiment
Below principle of the present invention and feature are described, example only be used for to be explained the present invention, is not be used to limiting scope of the present invention.
Embodiment 1: a kind of corn kernel Poisson ratio assay method comprises the following steps:
1) choosing of test material: test material used is corn kernel to be measured, microcomputer controlled electronic universal tester, grain moisture measuring apparatus, resolution 0.01mm vernier caliper, static strain analyzer, resistance strain gage, 240-360 order series sand paper, Instant cement and electric wire, electric soldering iron etc.
2) preparation of corn kernel sample to be measured: use grain moisture measuring apparatus corn kernel is carried out measurement of water-content coefficient, by vernier caliper, corn kernel is measured, choose and be about 14mm, wide approximately 11mm, the corn kernel of thick approximately 5mm carries out sample production.Use 240 orders, 320 order sand paper and 360 order sand paper are roughly ground, used to selected corn kernel finish grind, corn kernel is worn into the rectangular specimen of 9mm * 9mm * 3mm.
3) measuring foil gauge fixes: corn kernel embryo horizontal direction is defined as laterally, on seed sample two sides respectively along embryo vertically, the resistance strain gage that is laterally 4mm * 7.5mm with Instant cement with physical dimension pastes and fixes.
4) wire and foil gauge welding: select thin softer different colours wire, respectively on wire bonds is horizontal to the corn kernel embryo, resistance strain gage that vertically paste.Distance between two solder joints is 0.6mm-1mm.
Strain value when 5) sample to be tested loads compression is measured: the foil gauge wire other end of pasting on sample to be tested is connected to the static strain analyzer, then sample is positioned on microcomputer controlled electronic universal tester, carry out the axial compression test of corn kernel.Record is vertical, the transverse strain value, calculates the Poisson ratio of corn kernel.
The Poisson ratio computing formula is (1)
μ is the Poisson ratio of corn kernel. ε
dThe transverse strain value. ε
lIt is the longitudinal strain value.
Described microcomputer controlled electronic universal tester is 30.1N to the axial compression load of corn kernel sample.
The axial loading velocity of described microcomputer controlled electronic universal tester is 1mm/min.
Described corn kernel Poisson ratio should be the mean value of getting the relevant Poisson ratio of corn kernel that each compressive load calculates under pressure head 1mm/min loading velocity.
Under the described a kind of corn kernel Poisson ratio assay method of application example 1 is processed, corn kernel is positioned on microcomputer controlled electronic universal tester, the axial compression test that carries out, record is vertical, the transverse strain value, 5 groups of mensuration are carried out in every group of test, and measurement result is as shown in table 1.
Embodiment 2: described microcomputer controlled electronic universal tester is 60.2N to the axial compression load of corn kernel sample; The axial loading velocity of described microcomputer controlled electronic universal tester is 1.5mm/min; Described corn kernel Poisson ratio should be the mean value of getting the relevant Poisson ratio of corn kernel that each compressive load calculates under pressure head 1.5mm/min loading velocity, and all the other are identical with example 1.
Under the described a kind of corn kernel Poisson ratio assay method of application example 2 is processed, corn kernel is positioned on microcomputer controlled electronic universal tester, the axial compression test that carries out, record is vertical, the transverse strain value, 5 groups of mensuration are carried out in every group of test, and measurement result is as shown in table 1.
Embodiment 3: described microcomputer controlled electronic universal tester is 90.3N to the axial compression load of corn kernel sample; The axial loading velocity of described microcomputer controlled electronic universal tester is 2.0mm/min; Described corn kernel Poisson ratio should be the mean value of getting the relevant Poisson ratio of corn kernel that each compressive load calculates under pressure head 2.0mm/min loading velocity, and all the other are identical with example 1.
Under the described a kind of corn kernel Poisson ratio assay method of application example 3 is processed, corn kernel is positioned on microcomputer controlled electronic universal tester, the axial compression test that carries out, record is vertical, the transverse strain value, 5 groups of mensuration are carried out in every group of test, and measurement result is as shown in table 1.
Embodiment 4: described microcomputer controlled electronic universal tester is 120.4N to the axial compression load of corn kernel sample; The axial loading velocity of described microcomputer controlled electronic universal tester is 2.5mm/min; Described corn kernel Poisson ratio should be the mean value of getting the relevant Poisson ratio of corn kernel that each compressive load calculates under pressure head 2.5mm/min loading velocity, and all the other are identical with example 1.
Under the described a kind of corn kernel Poisson ratio assay method of application example 4 is processed, corn kernel is positioned on microcomputer controlled electronic universal tester, the axial compression test that carries out, record is vertical, the transverse strain value, 5 groups of mensuration are carried out in every group of test, and measurement result is as shown in table 1.
Embodiment 5: described microcomputer controlled electronic universal tester is 150N to the axial compression load of corn kernel sample; The axial loading velocity of described microcomputer controlled electronic universal tester is 3mm/min; Described corn kernel Poisson ratio should be the mean value of getting the relevant Poisson ratio of corn kernel that each compressive load calculates under pressure head 3mm/min loading velocity, and all the other are identical with example 1.
Under the described a kind of corn kernel Poisson ratio assay method of application example 5 is processed, corn kernel is positioned on microcomputer controlled electronic universal tester, the axial compression test that carries out, record is vertical, the transverse strain value, 5 groups of mensuration are carried out in every group of test, and measurement result is as shown in table 1.
Table 1 corn kernel Poisson ratio determination test data
The above is only preferred embodiment of the present invention, and is in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of doing, is equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (4)
1. corn kernel Poisson ratio assay method is characterized in that comprising the following steps:
Step 1: the preparation of corn kernel sample to be measured: use grain moisture measuring apparatus corn kernel is carried out measurement of water-content coefficient, by vernier caliper, corn kernel is measured, choose length greater than 12mm, width is greater than 10mm, and thickness carries out sample production greater than the corn kernel of 4mm.Use 240 orders-320 order sand paper to roughly grind, re-use 360 order sand paper to selected corn kernel and finish grind, corn kernel is worn into the rectangular specimen of 9mm * 9mm * 3mm;
Step 2: measure foil gauge and fix: corn kernel embryo horizontal direction is defined as laterally, vertically, laterally with Instant cement, resistance strain gage is pasted along embryo respectively on seed sample two sides and fixed;
Step 3: wire and foil gauge welding: select the different colours stranded conductor, respectively on wire bonds is horizontal to the corn kernel embryo, resistance strain gage that vertically paste;
Step 4: the strain value when sample to be tested loads compression is measured: the foil gauge wire other end of pasting on sample to be tested is connected to the static strain analyzer, again sample is positioned on microcomputer controlled electronic universal tester, carries out the axial compression test of corn kernel; Record is vertical, the transverse strain value, calculates the Poisson ratio of corn kernel.
2. a kind of corn kernel Poisson ratio assay method as claimed in claim 1, is characterized in that, described microcomputer controlled electronic universal tester is 30N-150N to the axial compression load of corn kernel sample.
3. a kind of corn kernel Poisson ratio assay method as claimed in claim 1, is characterized in that, the axial loading velocity of described microcomputer controlled electronic universal tester is 1mm/min-3mm/min.
4. a kind of corn kernel Poisson ratio assay method as claimed in claim 1, it is characterized in that, described corn kernel Poisson ratio is the mean value of getting the relevant Poisson ratio of corn kernel that each compressive load calculates under pressure head 1mm/min-3mm/min loading velocity.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105259187A (en) * | 2015-10-30 | 2016-01-20 | 山东省农作物种质资源中心 | Hilum character evaluation device and method |
| CN105259186A (en) * | 2015-10-30 | 2016-01-20 | 山东省农作物种质资源中心 | Device and method for evaluating color of coarse cereal seed |
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| SU665237A1 (en) * | 1975-04-29 | 1979-05-30 | Куйбышевский Ордена Трудового Красного Знамени Авиационный Институт Им.Акад. С.П.Королева | Poissone coefficient determining method |
| CN101063646A (en) * | 2006-04-24 | 2007-10-31 | 香港理工大学 | Method for testing and determining material or organizational Yang modulus and poisson ratio by impression |
| CN101713718A (en) * | 2009-07-28 | 2010-05-26 | 甘肃农业大学 | Method for determining corn grain hardness |
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2013
- 2013-01-30 CN CN2013100377450A patent/CN103091168A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU665237A1 (en) * | 1975-04-29 | 1979-05-30 | Куйбышевский Ордена Трудового Красного Знамени Авиационный Институт Им.Акад. С.П.Королева | Poissone coefficient determining method |
| CN101063646A (en) * | 2006-04-24 | 2007-10-31 | 香港理工大学 | Method for testing and determining material or organizational Yang modulus and poisson ratio by impression |
| CN101713718A (en) * | 2009-07-28 | 2010-05-26 | 甘肃农业大学 | Method for determining corn grain hardness |
Non-Patent Citations (5)
| Title |
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| W. BURUBAI ET AL: "Determination of Poisson’s ratio and elastic modulus of African nutmeg", 《INT. AGROPHYSICS》 * |
| 井玉安等: "钢蜂窝夹芯面内压缩性能", 《机械工程材料》 * |
| 李心平等: "玉米种子力学特性的有限元分析", 《农业机械学报》 * |
| 邹时华等: "基于工程塑料弹性模量与泊松比的测试方法研究", 《科技广场》 * |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105259187A (en) * | 2015-10-30 | 2016-01-20 | 山东省农作物种质资源中心 | Hilum character evaluation device and method |
| CN105259186A (en) * | 2015-10-30 | 2016-01-20 | 山东省农作物种质资源中心 | Device and method for evaluating color of coarse cereal seed |
| CN105259187B (en) * | 2015-10-30 | 2017-12-29 | 山东省农作物种质资源中心 | Hilum Character Evaluation device and evaluation method |
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Application publication date: 20130508 |