CN109855961A - A kind of middle low strain dynamic rate dynamic compression properties method of engineering arrestor - Google Patents
A kind of middle low strain dynamic rate dynamic compression properties method of engineering arrestor Download PDFInfo
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- CN109855961A CN109855961A CN201711245666.3A CN201711245666A CN109855961A CN 109855961 A CN109855961 A CN 109855961A CN 201711245666 A CN201711245666 A CN 201711245666A CN 109855961 A CN109855961 A CN 109855961A
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Abstract
The invention proposes a kind of middle low strain dynamic rate dynamic compression properties methods of engineering arrestor, it can get mechanical characteristic of the EMAS under the load of middle low strain dynamic rate based on this method, experimentation is similar with failure mode of the EMAS in practical engineering application under wheel rolling, and EMAS material can be obtained in stretch section, platform section and the compacting complete data of section three phases, therefore, the material parameter obtained based on the present invention can more accurately characterize the dynamic mechanical of EMAS material.
Description
Technical field
The invention belongs to the tests of the dynamic mechanical of material and characterization technique field, are related to a kind of engineering arrestor
Middle low strain dynamic rate dynamic compression properties method.
Background technique
Engineering material arresting system (Engineered Material Arresting System, abbreviation EMAS) can mention
For a kind of effective and practicable runway safety zone improved method, it is laid with EMAS in the safety zone of airfield runway end,
The risk after aircraft guns off the runway can be reduced, protects the safety of occupant and aircraft to greatest extent.EMAS blocks the principle of aircraft
It is exactly that the kinetic energy that EMAS material absorbs aircraft is rolled by undercarriage wheel after aircraft guns off the runway, makes aircraft in safety
Under the premise of gradually slow down and eventually stop at scheduled distance.During wheel and EMAS material effects, EMAS material
Process by rolling failure is dynamic failure, and the strain rate range of failure procedure EMAS material is generally less than 1000/s, is belonged to
In typical middle low strain dynamic rate range, dynamic mechanical data are to carry out EMAS to design necessary data input.
Under Dynamic Loading, material generally shows certain strain rate dependency, i.e. mentioning with load strain rate
Height, the mechanical property of material will show to differ markedly from the situation of semi-static load, due in different strain rate ranges
It is interior, it determines that the physical mechanism of material failure is also different, different experimental test procedures need to be used.Exist for EMAS system
Undercarriage wheel dynamic rolling failure for, EMAS material will be not only compressed to failure by wheel, will also further by
It is compressed into powder, and until powder is compacted, therefore, traditional dynamic compression experiments cannot characterize EMAS material considered repealed
Physical process.
Summary of the invention
Goal of the invention:
The present invention provides a kind of middle low strain dynamic rate dynamic compression properties methods of engineering arrestor, for grinding
Different load strain rates are studied carefully to the affecting laws of EMAS characteristic of material mechanics, are compared traditional dynamic compression experiments and are compared, this hair
The method of bright proposition can more accurately characterize the actual failure procedure of EMAS material and obtain corresponding material parameter.
Technical solution: a kind of middle low strain dynamic rate dynamic compression properties method of engineering arrestor, feature exist
In, comprising the following steps:
Step 1: starting material experiment-machine carries out preheating and system debug to experimental machine, it is ensured that experimental machine works normally；
Step 2: according to testing requirement, dedicated pressure head being mounted on the operating bar of experimental machine；
Step 3: regulation experiment machine beam height makes to have between pressure head and material and realizes that operating bar is loaded into mesh enough
Mark the priming stroke of speed；
Step 4: EMAS cell cube material being mounted on pressing plate, and enclosing is carried out to its surrounding with coaming plate；
Step 5: setting experiment test parameter and acquisition parameter；
Step 6: starting experimental machine operating bar triggers test macro before pressure head and EMAS material；
Step 7: pressure head accelerates to target velocity and is pressed into EMAS cell cube；
Step 8: load data and ram travel data storage to acquisition；
Step 9: analysis experimental data checks whether EMAS material has crackle generation；
Step 9: single experiment terminates, and removes EMAS cell cube material；
Step 10: returning to step 4, carry out new working condition experimenting.
Long stroke of the pressure head in EMAS material is not less than the 80% of material original height.
Mechanism constant airspeed of the pressure head in EMAS cell cube.
Beneficial effect
The present invention provides a kind of middle low strain dynamic rate dynamic compression properties methods of engineering arrestor, for grinding
Study carefully different load strain rates to the affecting laws of EMAS characteristic of material mechanics, for EMAS block specificity analysis and design provides
The material dynamic mechanical performance data input on basis, compares traditional dynamic compression experiments and compares, method energy proposed by the present invention
It more accurately characterizes the actual failure procedure of EMAS material and obtains corresponding material parameter, and the present invention has operability
By force, the advantages that test method is easy.
Specific embodiment
Technical solution of the present invention embodiment is described in detail below.
In specific implementation process of the present invention, pressure head, operating bar and EMAS cell cube material enclosing dress are designed and processed first
It sets, EMAS cell cube is laid on experimental machine pressing plate, and surrounding enclosing is carried out to EMAS cell cube, prevent in experimentation
Since the dynamic impulsion of pressure head causes cell cube to crack, the width of EMAS cell cube should be 5~8 times of pressure head diameter D, and press
Long stroke of the head in EMAS material is not less than the 80% of material original height, and experimentation need to keep pressure head mono- in EMAS
The mechanism constant airspeed of first body, with guarantee test obtain EMAS cell cube stress-strain data include stretch section,
Platform section and compacting section three phases, while being compacted the load upper limit that load is no more than experimental machine, it is ensured that experiment safety.It is real
The Resistance Value and actuating travel for needing testing pressure head during EMAS cell cube dynamic action are tested, matching obtains material in difference
Load-deformation curve under loading velocity.
Specific experiment steps flow chart is as follows:
Step 1: starting material experiment-machine carries out preheating and system debug to experimental machine, it is ensured that experimental machine works normally；
Step 2: according to testing requirement, pressure head being mounted on the operating bar of experimental machine；
Step 3: regulation experiment machine beam height makes to have between pressure head and material and realizes that operating bar is loaded into mesh enough
Mark the priming stroke of speed；
Step 4: EMAS cell cube material being mounted on pressing plate, and enclosing is carried out to its surrounding with coaming plate；
Step 5: setting experiment test parameter and acquisition parameter；
Step 6: starting experimental machine operating bar triggers test macro before pressure head and EMAS material；
Step 7: pressure head accelerates to target velocity and is pressed into EMAS cell cube；
Step 8: load data and ram travel data storage to acquisition；
Step 9: analysis experimental data checks whether EMAS material has crackle generation；
Step 9: single experiment terminates, and removes EMAS cell cube material；
Step 10: returning to step 4, carry out new working condition experimenting.
Test acceptable criterion are as follows:
1. after compression experiment, visual inspection EMAS material flawless is generated；
2. long stroke of the pressure head in EMAS material is not less than the 80% of material original height
3. obtaining the complete load-time graph of experimentation, displacement-time curve, data processing obtains stress-
Strain data includes stretch section, platform section and compacting section three phases.
Claims (3)
1. a kind of middle low strain dynamic rate dynamic compression properties method of engineering arrestor, which is characterized in that including following step
It is rapid:
Step 1: starting material experiment-machine carries out preheating and system debug to experimental machine, it is ensured that experimental machine works normally；
Step 2: according to testing requirement, dedicated pressure head being mounted on the operating bar of experimental machine；
Step 3: regulation experiment machine beam height makes to have between pressure head and material and realizes that operating bar is loaded into target velocity enough
Priming stroke；
Step 4: EMAS cell cube material being mounted on pressing plate, and enclosing is carried out to its surrounding with coaming plate；
Step 5: setting experiment test parameter and acquisition parameter；
Step 6: starting experimental machine operating bar triggers test macro before pressure head and EMAS material；
Step 7: pressure head accelerates to target velocity and is pressed into EMAS cell cube；
Step 8: load data and ram travel data storage to acquisition；
Step 9: analysis experimental data checks whether EMAS material has crackle generation；
Step 9: single experiment terminates, and removes EMAS cell cube material；
Step 10: returning to step 4, carry out new working condition experimenting.
2. a kind of middle low strain dynamic rate dynamic compression properties method of engineering arrestor according to claim 1,
It is characterized in that, long stroke of the pressure head in EMAS material is not less than the 80% of material original height.
3. a kind of middle low strain dynamic rate dynamic compression properties method of engineering arrestor according to claim 1,
It is characterized in that, mechanism constant airspeed of the pressure head in EMAS cell cube.
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| CN201711245666.3A CN109855961A (en) | 2017-11-30 | 2017-11-30 | A kind of middle low strain dynamic rate dynamic compression properties method of engineering arrestor |
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Citations (6)
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| US20110129295A1 (en) * | 2007-10-30 | 2011-06-02 | Omnitek Partners Llc | Deployable Collapsible Engineered Material Systems For Runway Safety |
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| CN203881614U (en) * | 2014-04-01 | 2014-10-15 | 长安大学 | All-in-one machine for geo-technical tension-compression strength test |
| CN104614226A (en) * | 2015-01-05 | 2015-05-13 | 王鹏 | Trail-type reciprocating circulating aircraft load simulating test device and application method thereof |
| CA2985374A1 (en) * | 2015-05-18 | 2016-11-24 | Engineered Arresting Systems Corporation | Suspended layered energy absorbing material for vehicle arresting systems |
| CN106989995A (en) * | 2017-06-15 | 2017-07-28 | 东华理工大学 | A kind of adjustable Rock And Soil of lateral spacing condition vertically compresses ancillary test device |
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2017
- 2017-11-30 CN CN201711245666.3A patent/CN109855961A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110129295A1 (en) * | 2007-10-30 | 2011-06-02 | Omnitek Partners Llc | Deployable Collapsible Engineered Material Systems For Runway Safety |
| CN102759482A (en) * | 2012-07-02 | 2012-10-31 | 中国民航科学技术研究院 | Mechanical performance testing method for special foam material of EMAS (Engineered Material Arresting System) |
| CN203881614U (en) * | 2014-04-01 | 2014-10-15 | 长安大学 | All-in-one machine for geo-technical tension-compression strength test |
| CN104614226A (en) * | 2015-01-05 | 2015-05-13 | 王鹏 | Trail-type reciprocating circulating aircraft load simulating test device and application method thereof |
| CA2985374A1 (en) * | 2015-05-18 | 2016-11-24 | Engineered Arresting Systems Corporation | Suspended layered energy absorbing material for vehicle arresting systems |
| CN106989995A (en) * | 2017-06-15 | 2017-07-28 | 东华理工大学 | A kind of adjustable Rock And Soil of lateral spacing condition vertically compresses ancillary test device |
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| ZHIPING DENG: "Compressive behavior of the cellular utilizing millimeter-size spherical SAP under high strain-rate loading", 《CONSTRUCTION & BUILDING MATERIALS》 * |
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Application publication date: 20190607 |
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