CN102128755A - Device and method for hoop tensile test based on laser impact biaxial loading - Google Patents
Device and method for hoop tensile test based on laser impact biaxial loading Download PDFInfo
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- CN102128755A CN102128755A CN 201010603976 CN201010603976A CN102128755A CN 102128755 A CN102128755 A CN 102128755A CN 201010603976 CN201010603976 CN 201010603976 CN 201010603976 A CN201010603976 A CN 201010603976A CN 102128755 A CN102128755 A CN 102128755A
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Abstract
The invention relates to a material dynamic tensile mechanical property test and belongs to the technical field of a material dynamic tensile mechanical property test. By using an intense laser pulse-induced impact wave as a loading condition, the material achieves a high strain rate; and different strain rates can be loaded by changing the laser pulse width and laser energy. A device comprises a high-power pulse laser (13), a laser head A (1), a laser head B (01), a restraining layer A (3), a restraining layer B (31), an absorbing layer A (4), an absorbing layer B (41), a loading rod A (6), a loading rod B (9), a cylindrical driving ring (8), a laser interferometer (10), a trigger A (11), a trigger B (110) and a computer (12). The device provided by the invention can be used for researching the dynamic tensile property of the material under the condition of different strain rates. The loading process is simple, the influencing factors are few, the calculation process is simple and the test cost is low.
Description
Technical field
The present invention relates to MATERIALS ' DYNAMIC tensile mechanical properties experimental technique field, relate in particular to the rings of material that loads by laser-impact to the Erichsen test method and apparatus.
Background technology
In a series of practical problemss of wide spectrums such as all kinds of engineerings, military technology and scientific research, even just in daily life, people can run into various blasts, shock load problem, and can observe, object blast, under the shock load mechanical response often with static load under have significantly differently, understand material and use and engineering design impacting the engineering that mechanical response under the loading environment will go far towards these materials.In addition, numerical simulation has been brought into play important effect in engineering design, and the prerequisite of carrying out numerical simulation is must at first set up one based on the constitutive model of material on the accurate stress-strain curve basis of (especially under the dynamic strain rate) under the various rate of strain.So obtaining the stress-strain curves of kit under high rate of strain then becomes top priority.Although people have developed multiple dynamic experiment technology, develop a kind of convenience, efficiently, accurate high rate of strain experimental provision is very important.
Wherein, the expansion loop technology is that the one dimension high strain rate tensile loads the important technology of measuring material dynamic performance, and the loading means of expansion loop technology tradition mainly are by thing piece bump, explosive detonation and Electromagnetic Drive, bigger, wayward and easily pollute with explosive detonation danger, Electromagnetic Drive is then extremely inconvenient in to the test of insulating material, and above method makes the material production strain rate relatively low, the difficult control of rate of strain, and loading method process complexity, influence factor is many, calculation of complex, the testing expenses height is dangerous big.
Based on this, this patent proposes to adopt laser high pressure, high energy, mode ultrafast, the Under High Strain rate that target is impacted loading first, measures material dynamic mechanical performance parameter under the high rate of strain with this.
Summary of the invention
The present invention seeks to overcome above shortcoming, a kind of hoop impact tension test method and apparatus that is loaded by laser-impact is provided, it with the plasma impact generated by explosion ripple of induced with laser as loaded load, replaced traditional method with thing piece bump or explosive charge generation shock wave, realizing that controlled strain rate loads and the loading of Under High Strain rate, is effective loading method of research material and stress wave activity under extreme conditions.
The present invention can come the strain rate of control material when loading by regulating laser pulse width and laser energy.Therefore can load the dynamic stretching of studying material under the different strain rate condition in the scope by laser.The pulsewidth that the invention is characterized in laser pulse is that 5 ~ 100 nanoseconds are adjustable, and wavelength 1064/532 nanometer is optional, and energy is adjustable at 1 ~ 100J.
The shock wave that the present invention utilizes intense laser pulse to induce carries out two-way loading, laser interferometer is tested the circumferential expansion speed of ring specimen, record ring specimen circumferential expansion speed history, by the relation between calculating acquisition stress, strain and the rate of strain, thereby obtain the material impact tensile property.
A kind of impact tension test method and apparatus that is loaded by laser-impact comprises laser head A, laser head B, laser pulse A, laser pulse B, restraint layer A, restraint layer B, absorption layer A, absorption layer B, load bar A, cone, ring specimen, the cylindrical drive ring, conical bore, drive block A, drive block B, drive block C, load bar B., laser interferometer, trigger A, trigger B, computer, high power pulsed laser; The laser radiation end of described load bar posts absorption layer and restraint layer successively, shock wave passes through load bar, cylindrical drive ring successively from the laser radiation end of load bar, finally affact on the ring specimen, laser interferometer is placed on the circumferential expansion direction appropriate position of ring specimen, the trigger branch is arranged in the laser pulse exit, and trigger, laser interferometer and high power pulsed laser link to each other with computer respectively.
Described cylindrical drive ring is by three drive block A that are separated from each other, and drive block B and drive block C form; Described cylindrical drive ring one end withstands on the load bar, and the other end is provided with conical bore, and conical bore matches with the cone of load bar.
Implementation step of the present invention is as follows:
(1) makes ring specimen according to testing requirements;
(2) post absorption layer and restraint layer successively at the incident bar coplanar laser illumination;
(3) ring specimen is installed on the cylindrical drive ring, cylindrical drive ring one end withstands on the push rod, the other end is provided with conical bore, conical bore matches with the cone of load bar, the other end of load bar withstands on the incident bar, and laser interferometer is placed on the circumferential expansion direction appropriate position of ring specimen;
(4) regulate the high power pulsed laser parameter, make parameter satisfy testing requirements, described high power pulsed laser parameter comprises: laser energy, laser pulse width;
(5) open trigger and laser interferometer, the circumferential expansion speed history of the ring specimen that computer preparation recording laser interferometer is surveyed;
(6) high power pulsed laser work, the emission laser pulse acts on the load bar end face and then ring specimen is loaded synchronously the final unstable fracture of ring specimen generation circumferential expansion of stand under load;
(7) by analyzing the circumferential expansion speed history of ring specimen, obtain the relation of material stress, strain and rate of strain, thereby obtain mechanical property and the Dynamic Fracture characteristic of material under high rate of strain load.
Advantage of the present invention is:
(1) can come the strain rate of control material when loading by changing laser pulse width and laser energy, realize that controlled strain rate loads.
(2) realize that the Under High Strain rate loads, loading the rate of strain that obtains can be up to 10
7More than, traditional loading method can only reach 10
4About.
(3) realize that bi-directional synchronization loads, realize the stack of stress wave, make expansion loop obtain bigger energy and rate of strain.
(4) can study the dynamic stretching of material under the laser loading environment, and additive method loading characteristic and laser are loaded with than big-difference.
(5) loading procedure is simple, and influence factor is few, calculates simply, and testing expenses are lower.
(6) can carry out dissimilarly, the hoop tension test of different materials is as metal, pottery, organic material etc.
The present invention can come the strain rate of control material when loading by regulating laser pulse width and laser energy.The effective means of the mechanical property of material and Dynamic Fracture characteristic under the high rate of strain condition.
Description of drawings
The invention will be further described below in conjunction with drawings and Examples.
Fig. 1 is a hoop tensile test apparatus synoptic diagram.
Fig. 2 produces the synoptic diagram of shock wave for induced with laser.
Fig. 3 is the driving ring cut-open view.
Fig. 4 is the driving ring vertical view.
Among the figure, 1. laser head A, 01 laser head B, 2. laser pulse A, 02. laser pulse B, 3. restraint layer A, 31. restraint layer B, 4. absorption layer A, 41. absorption layer B, 6. load bar A, 61 cones, 7. ring specimen, 8. cylindrical drive ring, 81. conical bore, 82. drive block A, 83. drive block B, 84. drive block C, 9 load bar B., 10. laser interferometer, 11. trigger A, 110. trigger B, 12. computer, 13. high power pulsed laser, 14. plasmas, 15. shock waves.
Embodiment
Embodiment describes in further detail the present invention below in conjunction with accompanying drawing.
As shown in Figure 1, a kind of impact tension test method and apparatus that is loaded by laser-impact comprises 1. laser head A, 01 laser head B, 2. laser pulse A, 02. laser pulse B, 3. restraint layer A, 31. restraint layer B, 4. absorption layer A, 41. absorption layer B, 6. load bar A, 61 cones, 7. ring specimen, 8. cylindrical drive ring, 81. conical bore, 82. drive block A, 83. drive block B, 84. drive block C, 9 load bar B., 10. laser interferometer, 11. trigger A, 110. trigger B, 12. computer, 13. high power pulsed laser, the other end of load bar 6 has been wholely set cone 61, and cylindrical drive ring 8 is by three drive block A82 that are separated from each other, drive block B83 and drive block C84 form, one end of cylindrical drive ring 8 be provided with the conical bore 81 that matches with cone 61, the other end apical grafting of cylindrical drive ring 8 has been wholely set annular boss on the outer circumference surface of cylindrical drive ring 8 on the end face of load bar B9.The laser radiation end of load bar A6 and load bar B9 posts absorption layer A4 and absorption layer B41, restraint layer A3 and restraint layer B31 successively.Laser interferometer 10 is placed on the circumferential expansion direction appropriate position of ring specimen 7.
Laser-impact loaded ring of the present invention is to the stretching principle: according to selected laser parameter (wavelength, pulsewidth, energy), by 13 work of computer 12 control high power pulsed laser, emission laser pulse A2 and laser pulse B02(pulsewidth are nanosecond, power density is the gigawatt level), laser pulse A2 and laser pulse B02 interact with the absorption layer of the coplanar laser illumination that is affixed on load bar A6 and load bar B9 respectively and produce plasma 15, plasma 14 blasts of restrained layer constraint produce shock wave 15, see Fig. 2, shock wave 15 is by load bar 6, the cone 61 of load bar A6 cooperates with the conical bore 81 of cylindrical drive ring 8, other end shock wave is by the end face of load bar B9 effect and cylindrical drive ring 8 simultaneously, the realization bi-directional synchronization loads, realize the stack of stress wave, make by drive block A82, the cylindrical drive ring that drive block B83 and drive block C84 form produces circumferential expansion, sees Fig. 3 and Fig. 4, thereby sample 7 is loaded.The resonator cavity pump power changes the pulsewidth of pulse laser in the high power pulsed laser 13 by changing in the present invention, or passes through to change laser instrument 13 exomonental energy, thus the strain rate of control material when loading.
Specific implementation process:
(1) make ring specimen 7 according to testing requirements, the sample cross sectional shape is made according to testing requirements, and sectional dimension is suitable, ring specimen can be broken in the warranty test;
(2) post absorption layer A4 and restraint layer A3 successively at load bar A6 coplanar laser illumination, post absorption layer B41 and restraint layer B31 successively at load bar B9 coplanar laser illumination;
(3) ring specimen 7 is installed on the cylindrical drive ring 8, cylindrical drive ring 8 one ends withstand on the load bar B9, the other end is provided with conical bore 81, and conical bore 81 matches with the cone 61 of load bar A6, and laser interferometer 10 is placed on the circumferential expansion direction appropriate position of ring specimen 7;
(4) regulate high power pulsed laser 13 parameters, make parameter satisfy testing requirements, described high power pulsed laser 13 major parameters comprise: laser energy, laser pulse width;
(5) open trigger A11 and B110, laser interferometer 10, the circumferential expansion speed history of the ring specimen 7 that computer 12 preparation recording laser interferometers 10 are surveyed;
(6) high power pulsed laser 13 work, emission laser pulse 2 acts on load bar A6 end face, and laser pulse A02 acts on load bar B9 end face simultaneously, and then ring specimen 7 is loaded, and the final unstable fracture of circumferential expansion takes place in the ring specimen 7 of stand under load; Simultaneously, computer 12 receives the trigger pip of trigger A11 and trigger B110,10 work of control laser interferometer;
(7) by analyzing the circumferential expansion speed history of ring specimen 7, obtain the relation of material stress, strain and rate of strain, its relation is as follows: circumference stress is
, plastic strain is
, rate of strain is
, wherein
Be the density of ring specimen,
With
Be respectively the radius in ring specimen initial radium and the motion process,
Be speed,
Be acceleration, the speed of expansion of ring specimen, displacement can directly be measured, and acceleration relies on the speed differential to obtain, thereby obtain mechanical property and the Dynamic Fracture characteristic of material under high rate of strain load.
In the foregoing description, the drive block number of cylindrical drive ring 8 can be four or five etc., but can not be less than two; Described laser interferometer 10 can be one or more, is distributed on the hoop circumference of ring specimen 7.
Claims (4)
1. the hoop tensile test apparatus of the two-way loading of laser-impact, it is characterized in that, comprise high power pulsed laser (13), laser head A(1) and laser head B(01), restraint layer A(3) and restraint layer B(31), absorption layer A(4) and absorption layer B(41), load bar A(6) and load bar B(9), cylindrical drive ring (8), laser interferometer (10), trigger A(11), trigger B(110) and computer (12); Described cylindrical drive ring (8) is by three drive block A(82 that are separated from each other), drive block B(83) and drive block C(84) form, described drive block A(82), drive block B(83) and drive block C(84) be combined to form a step cylinder that contains coniform hollow cone hole (81); One end and load bar A(6 of the conical bore (81) of described cylindrical drive ring (8)) cone (61) match, the other end of cylindrical drive ring (8) withstands on load bar B(9) on; Described load bar A(6) and load bar B(9) the laser radiation end post absorption layer A(4 successively), absorption layer B(41) and restraint layer A(3), restraint layer B(31), described laser head A(1) and laser head B(01) aim at load bar A(6 respectively) and load bar B(9) the laser radiation end, laser interferometer (10) is placed on the circumferential expansion direction position of ring specimen (7), trigger A(11) and trigger B(110) divide be arranged in laser pulse A(2) and laser pulse B(02) side in exit, trigger A(11) and trigger B(110), laser interferometer (10) links to each other with computer (12) respectively with high power pulsed laser (13).
2. method that realizes the hoop tensile test apparatus of the two-way loading of the described laser-impact of claim 1, it is characterized in that, the shock wave that utilizes intense laser pulse to induce loads sample, the circumferential expansion speed of laser interferometer (10) measure annular sample, obtain the mechanical property of material under high rate of strain load and the parameter of Dynamic Fracture characteristic, concrete steps are:
(A) make ring specimen (7) according to testing requirements;
(B) at load bar A(6) and load bar B(9) coplanar laser illumination post absorption layer A(4 successively), absorption layer B(41) and restraint layer A(3), restraint layer B(31);
(C) ring specimen (7) is installed on the cylindrical drive ring (8), cylindrical drive ring (8) one ends withstand on load bar B(9) on, the other end is provided with conical bore (81), conical bore (81) and load bar A(6) cone (61) match, laser interferometer (10) is placed on the circumferential expansion direction position of ring specimen (7);
(D) parameter of adjusting high power pulsed laser (13) makes parameter satisfy testing requirements;
(E) open trigger A(11), trigger B(110) and laser interferometer (10), the circumferential expansion speed history of the ring specimen (7) that computer (12) preparation recording laser interferometer (10) is surveyed;
(F) high power pulsed laser (13) work, emission laser pulse A(2) and B(02) act on load bar A(6 respectively) and load bar B(9) end face and then ring specimen (7) loaded;
(G) by analyzing the circumferential expansion speed history of ring specimen (7), obtain the relation of material stress, strain and rate of strain, thereby obtain mechanical property and the Dynamic Fracture characteristic of material under high rate of strain load.
3. the method for the hoop tension test of the two-way loading of a kind of laser-impact according to claim 2 is characterized in that, described laser head A(1) and laser head B(01) unidirectional loading or synchronous bidirectional loading.
4. the method for the hoop tension test of the two-way loading of a kind of laser-impact according to claim 2, it is characterized in that, the pulsewidth of described laser pulse was 5 ~ 100 nanoseconds, wavelength is 1064/532 nanometer, energy is 1 ~ 100J, realizes that by changing laser pulse width and energy different strain rate loads.
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| CN 201010603976 CN102128755B (en) | 2010-12-24 | 2010-12-24 | Device and method for hoop tensile test based on laser impact biaxial loading |
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| CN 201010603976 CN102128755B (en) | 2010-12-24 | 2010-12-24 | Device and method for hoop tensile test based on laser impact biaxial loading |
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| CN102128755B CN102128755B (en) | 2013-06-12 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102778257A (en) * | 2012-07-18 | 2012-11-14 | 中国科学院力学研究所 | Strong laser driven explosion and impact effect test platform |
| CN104330316A (en) * | 2014-10-28 | 2015-02-04 | 中北大学 | Method for producing extremely-narrow acceleration excitation signal based on pulse laser |
| CN107831072A (en) * | 2017-11-02 | 2018-03-23 | 中国工程物理研究院上海激光等离子体研究所 | A kind of miniature target heater and its application method that loading experiment is moved for laser |
| CN109459177A (en) * | 2018-11-22 | 2019-03-12 | 西安近代化学研究所 | A kind of shock wave pressure range measuring device |
| CN109916744A (en) * | 2019-04-18 | 2019-06-21 | 广东工业大学 | A kind of detection method and equipment of solder joint and substrate tensile strength |
| CN110369861A (en) * | 2019-07-23 | 2019-10-25 | 广东工业大学 | A method of preparing the pre-buried lamination defect of composite laminated plate |
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|---|---|---|---|---|
| US4401477A (en) * | 1982-05-17 | 1983-08-30 | Battelle Development Corporation | Laser shock processing |
| CN101745740A (en) * | 2009-12-23 | 2010-06-23 | 江苏大学 | Metal plate material ring-shaped light spot laser impact forming method and device |
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2010
- 2010-12-24 CN CN 201010603976 patent/CN102128755B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4401477A (en) * | 1982-05-17 | 1983-08-30 | Battelle Development Corporation | Laser shock processing |
| CN101745740A (en) * | 2009-12-23 | 2010-06-23 | 江苏大学 | Metal plate material ring-shaped light spot laser impact forming method and device |
Non-Patent Citations (1)
| Title |
|---|
| 《农业机械学报》 20060331 张兴权等 《铝靶在激光冲击波加载下的动态损伤实验》 第37卷, 第3期 * |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102778257A (en) * | 2012-07-18 | 2012-11-14 | 中国科学院力学研究所 | Strong laser driven explosion and impact effect test platform |
| CN102778257B (en) * | 2012-07-18 | 2015-06-17 | 中国科学院力学研究所 | Strong laser driven explosion and impact effect test platform |
| CN104330316A (en) * | 2014-10-28 | 2015-02-04 | 中北大学 | Method for producing extremely-narrow acceleration excitation signal based on pulse laser |
| CN107831072A (en) * | 2017-11-02 | 2018-03-23 | 中国工程物理研究院上海激光等离子体研究所 | A kind of miniature target heater and its application method that loading experiment is moved for laser |
| CN107831072B (en) * | 2017-11-02 | 2019-10-22 | 中国工程物理研究院上海激光等离子体研究所 | A kind of miniature target heating device and its application method moving loading experiment for laser |
| CN109459177A (en) * | 2018-11-22 | 2019-03-12 | 西安近代化学研究所 | A kind of shock wave pressure range measuring device |
| CN109459177B (en) * | 2018-11-22 | 2020-08-21 | 西安近代化学研究所 | Shock wave pressure range measuring device |
| CN109916744A (en) * | 2019-04-18 | 2019-06-21 | 广东工业大学 | A kind of detection method and equipment of solder joint and substrate tensile strength |
| CN110369861A (en) * | 2019-07-23 | 2019-10-25 | 广东工业大学 | A method of preparing the pre-buried lamination defect of composite laminated plate |
| CN110369861B (en) * | 2019-07-23 | 2021-01-26 | 广东工业大学 | Method for preparing composite laminated board pre-buried layering defect |
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