CN105928804A - Method for obtaining impact deformation temperature of split Hopkinson pressure bar test-piece - Google Patents
Method for obtaining impact deformation temperature of split Hopkinson pressure bar test-piece Download PDFInfo
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- CN105928804A CN105928804A CN201610226316.1A CN201610226316A CN105928804A CN 105928804 A CN105928804 A CN 105928804A CN 201610226316 A CN201610226316 A CN 201610226316A CN 105928804 A CN105928804 A CN 105928804A
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- temperature
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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
- G01N3/30—Investigating strength properties of solid materials by application of mechanical stress by applying a single impulsive force, e.g. by falling weight
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/02—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using thermoelectric elements, e.g. thermocouples
Abstract
The invention discloses a method for obtaining an impact deformation temperature of a split Hopkinson pressure bar test-piece. The method includes performing a split Hopkinson pressure bar test to obtain a historical curve of the test-piece at the steady-state temperature, establishing a 3D heat transfer model of the test-piece and a thermocouple according to the deformation size of the test-piece and the parameters of the thermocouple, performing finite element mesh division for the 3D heat transfer model, loading different initial temperature for the heat transfer model to obtain the temperature curve of cooling process loaded different initial temperature, taking instantaneous temperature in anytime (6-12 s) in the temperature curve of cooling process to obtain a corresponding relationship between the instantaneous temperature and the loaded initial temperature, fitting a relation curve between the different loaded initial temperature and the corresponding instantaneous temperature of the test-piece at the taken moment, and calculating the impact deformation temperature of the test-piece. The method can obtain the deformation temperature of the test-piece after suffering impact by combining the test and simulation. Moreover, the method is simple, has strong operability and low cost, and can obtain the quite accurate deformation temperature.
Description
Technical field
The present invention relates to metal material machining and material constitutive equation computing technique field, in particular, especially
Relate to the acquisition methods of a kind of Hopkinson pressure bar test specimen blastic deformation temperature.
Background technology
Metal cutting process is one material removing method effectively, is widely used to commercial production at present.To cutting
Further appreciating that of mechanism can reduce production cost, reduces tool wear, improves workpiece surface quality.Metal cutting process mistake
Journey is an extremely complex nonlinear deformation, large strain rate, the process of Thermal-mechanical Coupling, uses traditional Study of Cutting method very
Difficult be predicted cutting scheme is analyzed.And in the case of utilizing finite element modeling and emulation technology can realize not damaging material
Carrying out the optimization of cutter and cutting parameter, therefore Finite Element Method is increasingly becoming the one of working angles research and emulation effectively
Means.
Material constitutive equation is by the key of working angles finite element simulation, and the precision of constitutive equation also determines emulation
The reliability of result.Set up towards cutting metal material constitutive equation before, need use separate type Hopkinson
(Hopkinson) depression bar experimental technique carries out yield strength, strain hardening effect, strain rate hardening effect and thermal softening effect
Obtain, and then resolve the constitutive equation obtaining metal material.Carrying out material impact deformation experiment process, the plastic deformation of material
Can be deformed temperature, this temperature has the effect of softener material, all ignores this deformation when obtaining material effect item at present
Temperature factor, finally have impact on the material constitutive equation precision of gained.It is therefore necessary to obtain this deformation temperature.
But obtain this deformation temperature and there is difficulty: blastic deformation process time is extremely short, 10−5–10−4In the range of s, temperature
The generation process of degree is moment.Using theoretical calculation, middle hypothesis is more, and precision is undesirable, and result of calculation needs to be tested
Card；Using the radiant-heat method of Infrared Detectors, cost is high, it is thus achieved that be deformation test specimen external temperature field, and differentiate at picture
It is difficult to determine the temperature of test specimen regional area in rate；Use contact heat sensor, the problem that there is sample frequency, cannot gather
Variations in temperature to very short time.
Summary of the invention
Based on this, present invention aims to the problem that prior art exists, it is provided that a kind of Hopkinson pressure bar examination
The acquisition methods of part blastic deformation temperature, its workable, low cost, and it is obtained in that more accurate deformation temperature.
In order to solve posed problems above, the technical solution used in the present invention is:
A kind of acquisition methods of Hopkinson pressure bar test specimen blastic deformation temperature, this acquisition methods specifically includes as follows:
Step 1: carry out Hopkinson pressure bar experiment, i.e. uses thermocouple measurement surface of test piece to be subject under the conditions of different strain rate
Temperature after impact, it is thus achieved that steady temperature history curve；
Step 2: according to the deformation size of test specimen and the parameter of thermocouple after experiment, structure test specimen and the Three-dimensional Heat-transfer mould of thermocouple
Type, and described heat transfer model is carried out FEM meshing；
Step 3: described heat transfer model is loaded different initial temperatures, and obtains the cooling procedure under different initial temperature loads
Temperature curve and transient Temperature Distribution figure thereof；
Step 4: take the transient state temperature of heat transfer model described in 6-12 any time second in the cooling procedure temperature curve that step 3 obtains
Degree, obtains the corresponding relation of itself and the initial temperature loaded；
Step 5: the relation curve between initial temperature and the transient temperature of taken moment test specimen that matching difference loads, and obtain
The initial temperature loadedTransient temperature with the taken momentBetween functional relationship (such as formula 1,WithFor constant)；
(1)
Step 6: the temperature after the taken moment is impacted of the test specimen in step 1 is substituted in formula (1), it is thus achieved that test specimen is in impact
After maximum temperature, and calculate blastic deformation temperature according to formula (2), whereinFor ambient temperature,
(2).
In described step 2, utilize ANSYS integrated board with grid to divide order and described Three-dimensional Heat-transfer model is carried out finite element grid
Divide.
In described step 4, take the transient temperature of heat transfer model described in any one moment in 6-12s.
Compared with prior art, the beneficial effects of the present invention is:
Installing thermocouple in surface of test piece in the present invention, owing to test specimen is when carrying out Hopkinson pressure bar test, its surface can go out
Now deform, by thermocouple measurement surface of test piece temperature in process of the test, i.e. can obtain test specimen in conjunction with finite element simulation
Deformation temperature after being impacted, its method is simple, workable, low cost, and is obtained in that and deforms temperature the most accurately
Degree.
Accompanying drawing explanation
Fig. 1 is the flow chart of Hopkinson pressure bar test specimen blastic deformation method for acquiring temperature of the present invention.
Fig. 2 is the schematic diagram of Hopkinson pressure bar thermometric of the present invention experiment.
Fig. 3 is the measurement point stable state historical temperature curve after test specimen is impacted in the present invention.
Fig. 4 is the test specimen transient Temperature Distribution figure of simulation calculation gained of the present invention.
Fig. 5 is the relation curve of transient temperature during 10s of the present invention and initial temperature.
Fig. 6 is the test specimen of the present invention deformation temperature figure under the conditions of different strain rate.
Description of reference numerals: 1-test specimen, 2-thermocouple, 3-thermocouple temperature measurement point.
Detailed description of the invention
For the ease of understanding the present invention, below with reference to relevant drawings, the present invention is described more fully.In accompanying drawing
Give presently preferred embodiments of the present invention.But, the present invention can realize in many different forms, however it is not limited to institute herein
The embodiment described.On the contrary, providing the purpose of these embodiments is to make the understanding to the disclosure of invention more thorough complete
Face.
Unless otherwise defined, all technology used herein and scientific terminology and the technology belonging to technical field
The implication that personnel are generally understood that is identical.The term used the most in the description of the invention is intended merely to describe concrete
Embodiment purpose, it is not intended that in limiting the present invention.
Refering to shown in Fig. 1, the acquisition methods of a kind of Hopkinson pressure bar test specimen blastic deformation temperature that the present invention provides, should
Acquisition methods specifically includes as follows:
Step 1: carry out Hopkinson pressure bar experiment, i.e. uses thermocouple measurement surface of test piece to be subject under the conditions of different strain rate
Temperature after impact, it is thus achieved that steady temperature history curve.
In the present embodiment, use Alpaka B10 material to make φ 4X6mm test specimen 1, thermocouple 2 be installed on test specimen 1 surface,
As in figure 2 it is shown, i.e. thermocouple temperature measurement point 3 is on test specimen 1 surface.Adjust respectively strain rate be 1000,2000,3000,4000,
5000,6000,7000/s carry out Hopkinson pressure bar experiment, and record the stable state historical temperature curve after test specimen is impacted,
As shown in Figure 3.
Step 2: pass according to deformation size and the three-dimensional of the parameter of thermocouple, structure test specimen and thermocouple of test specimen after experiment
Thermal model, and described Three-dimensional Heat-transfer model is carried out FEM meshing.
In the present embodiment, use ANSYS integrated board with grid to divide order and described Three-dimensional Heat-transfer model is carried out finite element grid
Dividing, it is reliable and is easily achieved.
Step 3: described Three-dimensional Heat-transfer model is loaded different initial temperatures, and obtains under different initial temperature loading
Model chilling temperature history curve and transient Temperature Distribution figure thereof.
Described initial temperatureElect 40 DEG C, 50 DEG C, 70 DEG C, 80 DEG C, 100 DEG C, in the present embodiment, initial temperature respectively as
Be the transient Temperature Distribution figure of 100 DEG C as shown in Figure 4.
Step 4: take the transient temperature of any one second in the transient Temperature Distribution figure that step 3 obtains, and by itself and loading
Initial temperature contrast, obtain both corresponding relations；Taking that the transient temperature in any one moment in 6-12s can obtain can
The temperature leaned on, when taking 10s in the present embodiment, the transient temperature of test specimen is designated as。
Step 5: the relation curve between initial temperature and the transient temperature of taken moment test specimen that matching difference loads, and
Obtain the initial temperature loadedTransient temperature with the taken momentBetween functional relationship；In the present embodiment, during 10s
Transient temperature and initial temperature relation curve as shown in Figure 5, parse function as shown in Equation 3.
(3)
Step 6: the temperature after the taken moment is impacted of the test specimen in step 1 is substituted in formula (3), it is thus achieved that test specimen is in punching
Maximum temperature after hitting, and calculate blastic deformation temperature according to formula (4), whereinFor ambient temperature, take 20 DEG C,
(4).
In the present embodiment, during temperature during 10s substitutes into formula (1) after being impacted by test specimen, obtain test specimen after the blow
Maximum temperature and blastic deformation temperature, wherein,WithIt is the most corresponding, as shown in table 1, so far obtains Alpaka
The deformation temperature of B10 impact process, its curve chart is as shown in Figure 6.
Maximum temperature and deformation temperature after under table 1 different strain rate, test specimen impacts
| Strain rate/s-1 | 1194 | 1924 | 3195 | 4055 | 4564 | 6069 | 6870 |
| Maximum temperature/℃ | 47.94 | 55.03 | 60.78 | 72.63 | 85.91 | 95.22 | 98.91 |
| Deformation temperature/℃ | 27.94 | 35.03 | 40.78 | 52.63 | 65.91 | 75.22 | 78.91 |
Above-described embodiment is the present invention preferably embodiment, but embodiments of the present invention are not limited by above-described embodiment
System, the change made, modifies, substitutes, combines, simplifies, all under other any spirit without departing from the present invention and principle
Should be the substitute mode of equivalence, within being included in protection scope of the present invention.
Claims (3)
1. the acquisition methods of a Hopkinson pressure bar test specimen blastic deformation temperature, it is characterised in that: this acquisition methods specifically wraps
Include as follows:
Step 1: carry out Hopkinson pressure bar experiment, i.e. uses thermocouple measurement surface of test piece to be subject under the conditions of different strain rate
Temperature after impact, it is thus achieved that test specimen steady temperature history curve；
Step 2: according to the deformation size of test specimen and the parameter of thermocouple after experiment, structure test specimen and the Three-dimensional Heat-transfer mould of thermocouple
Type, and described heat transfer model is carried out FEM meshing；
Step 3: described heat transfer model is loaded different initial temperatures, and obtains the cooling procedure under different initial temperature loads
Temperature curve and transient Temperature Distribution figure thereof；
Step 4: take the transient state temperature of heat transfer model described in 6-12 any time second in the cooling procedure temperature curve that step 3 obtains
Degree, obtains the corresponding relation of itself and the initial temperature loaded；
Step 5: the relation curve between different initial temperatures and the transient temperature of taken moment test specimen that matching loads, and obtain
The initial temperature loadedTransient temperature with the taken momentBetween functional relationship (such as formula 1,WithFor constant)；
(1)
Step 6: the temperature after the taken moment is impacted of the test specimen in step 1 is substituted in formula (1), it is thus achieved that test specimen is in impact
After maximum temperature, and calculate blastic deformation temperature according to formula (2), whereinFor ambient temperature,
(2).
The acquisition methods of Hopkinson pressure bar test specimen blastic deformation temperature the most according to claim 1, it is characterised in that: institute
State in step 2, utilize ANSYS integrated board with grid to divide order and described Three-dimensional Heat-transfer model is carried out FEM meshing.
The acquisition methods of Hopkinson pressure bar test specimen blastic deformation temperature the most according to claim 1 and 2, its feature exists
In: in described step 4, take the transient temperature of heat transfer model described in any time in 6-12s.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111307568A (en) * | 2020-03-09 | 2020-06-19 | 山东大学 | Method for measuring metal plastic deformation strain rate effect characterization parameters |
| CN116519500A (en) * | 2023-04-19 | 2023-08-01 | 山东科技大学 | Method for acquiring dynamic temperature cloud picture of Hopkinson pressure bar sample |
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| CN2529225Y (en) * | 2002-03-11 | 2003-01-01 | 北京航空航天大学 | Deivice for measuring transient temp. of ceramic warhead surface of guided missile high-speed thermal shock test |
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2016
- 2016-04-13 CN CN201610226316.1A patent/CN105928804A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2529225Y (en) * | 2002-03-11 | 2003-01-01 | 北京航空航天大学 | Deivice for measuring transient temp. of ceramic warhead surface of guided missile high-speed thermal shock test |
Non-Patent Citations (4)
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| D.C.XU 等: "An Improved Method for Acquisition of High-Speed Cutting Zone Temperature Based On Heat Conduction Reverse Seeking", 《ADVANCED MATERIALS RESEARCH》 * |
| D.XU 等: "A friction model having multiple factors for high-speed cutting of aluminum alloy 6061-T6", 《THE INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY》 * |
| 张京京 等: "一种借助有限元传热仿真的刀尖点切削温度精确测量方法", 《工具技术》 * |
| 徐道春 等: "铝合金6061-T6高速切削物理仿真材料本构模型", 《农业机械学报》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111307568A (en) * | 2020-03-09 | 2020-06-19 | 山东大学 | Method for measuring metal plastic deformation strain rate effect characterization parameters |
| CN116519500A (en) * | 2023-04-19 | 2023-08-01 | 山东科技大学 | Method for acquiring dynamic temperature cloud picture of Hopkinson pressure bar sample |
| CN116519500B (en) * | 2023-04-19 | 2024-03-12 | 山东科技大学 | Method for acquiring dynamic temperature cloud picture of Hopkinson pressure bar sample |
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Application publication date: 20160907 |