CN104181191B - The test of expanded rubber bulk modulus and sample preparation device and method - Google Patents
The test of expanded rubber bulk modulus and sample preparation device and method Download PDFInfo
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- CN104181191B CN104181191B CN201410032281.9A CN201410032281A CN104181191B CN 104181191 B CN104181191 B CN 104181191B CN 201410032281 A CN201410032281 A CN 201410032281A CN 104181191 B CN104181191 B CN 104181191B
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Abstract
The present invention relates to engineer testing apparatus field, particularly relate to the test of expanded rubber bulk modulus and sample preparation device thereof and method.Its device includes metallic cavity;Pressure head, coordinates the preparation carrying out expanded rubber sample with metallic cavity;Temperature control system, controls heating coils heat metallic cavity in preparation, coefficient of cubical expansion test and the heat expansion pressure test of expanded rubber sample;Metallic gasket, is arranged at above expanded rubber sample in coefficient of cubical expansion test and heat expansion pressure test;Displacement measuring device, measures the change in displacement of metallic gasket at the coefficient of cubical expansion in testing;Load acquisition system, for measuring the bulbs of pressure change of expanded rubber sample in heat expansion pressure test.The present invention integrates the preparation of expanded rubber sample and bulk modulus is tested, it is ensured that bulk modulus quickly, test easily and accurately, provides safeguard for effectively controlling thermal expansion technique forming composite parts quality.
Description
Technical field
The present invention relates to engineer testing apparatus field, particularly relate to expanded rubber bulk modulus test and
Sample preparation device and the test of expanded rubber bulk modulus and preparation method of sample thereof.
Background technology
In order to meet the shaping of the complicated closure member such as composite cell type part, tubular member and multi-cavity structure
Needing, thermal expansion moulding process becomes composite and manufactures one of important research contents in field.Thermal expansion becomes
Type technique refers to that material prepreg laying is come real in the rigidity former of Guan Bi by the expanded by heating of core
The now forming method to composite cure under pressure.This technique is generally with the bigger material of thermal coefficient of expansion as core
Mould, rigid material is former, is placed between core and former by composite, after mould is heated, core
Volumetric expansion, owing to the thermal coefficient of expansion of core material is far longer than the thermal coefficient of expansion of former material, therefore
The volumetric expansion of core is limited by former, then produce pressure in die cavity, thus realize in technical process
Composite is pressurizeed.In technical process, the bulbs of pressure that conservative control core produces after being heated are to control again
The key of condensation material parts quality, and core material volume elastic modelling quantity is an important parameter.At present, work
In industry, widely used core material is expanded rubber, therefore, and the accuracy of expanded rubber bulk modulus
Become the important prerequisite controlling composite briquetting pressure.
Expanded rubber raw material manufacturer can provide corresponding parameter to instruct core to design effectively to control thermal expansion
Technological forming pressure, but the actually used middle meeting of expanded rubber needs to add filler, the kind of filler according to technique
Class and quantity are indefinite, and the parameter that producer provides just loses directive significance, and technique department can only pass through " trial-and-error method "
Realize the control to heat expansion pressure after carrying out test of many times, cause a large amount of wastes of human and material resources, financial resources;
Additionally, it is generally the case that in bulk modulus test process, sample preparation device and test device phase
The most independent, the scale error that sample process causes will cause sample can not mate with test equipment, impact
The accuracy of test result.
Summary of the invention
It is an object of the invention to provide a kind of preparation collecting expanded rubber sample and bulk modulus test is
The expanded rubber bulk modulus test of one and sample preparation device and expanded rubber bulk modulus
Test and preparation method of sample thereof.
For reaching this purpose, the present invention by the following technical solutions:
The invention provides the test of expanded rubber bulk modulus and sample preparation device thereof, including wire chamber
Body, it includes that base and metal barrel, the periphery of described metal barrel are arranged with heating coil;
Pressure head, it coordinates the preparation carrying out expanded rubber sample with described metallic cavity;Described pressure head has can
Stretching into the press section in described metal barrel, described pressure head is provided with and runs through described press section and lead to described pressure
Flash mouth outside Tou;
Temperature control system, it is in preparation, coefficient of cubical expansion test and the heat expansion of described expanded rubber sample
Pressure test sequence controls metallic cavity described in described heating coils heat;
Metallic gasket, it is tested and heat expansion pressure test at the coefficient of cubical expansion of described expanded rubber sample
Journey is arranged at the top of described expanded rubber sample, described metallic gasket shape and size and described metal cylinder
The inwall of wall is suitable;
Displacement measuring device, it is for surveying in the coefficient of cubical expansion test process of described expanded rubber sample
Measure the change in displacement of described metallic gasket;
Load acquisition system, described for measuring in the heat expansion pressure test sequence of described expanded rubber sample
The change of the bulbs of pressure that expanded rubber sample produces because of expanded by heating, it include load record system and with institute
Stating two mechanical test compressing heads that load record system is all connected, described load record system is for record not
The bulbs of pressure of synthermal lower described expanded rubber sample, one of them described mechanical test compressing head is arranged at
The top of described metallic gasket, another described mechanical test compressing head is arranged at the lower section of described base.
As the preferred version of the present invention, described temperature control system includes for detecting described wire chamber body temperature
First thermocouple of degree, described first thermocouple is arranged in the first putting hole on described metal barrel.
As the preferred version of the present invention, described pressure head is provided with the second putting hole installing the second thermocouple.
As the preferred version of the present invention, described base is connected with described metal barrel by fastening bolt.
As the preferred version of the present invention, institute's displacement measurement device is dial gauge.
A kind of for the expanded rubber bulk modulus test as described in any of the above-described preferred version and sample thereof
The expanded rubber bulk modulus test of preparation facilities and preparation method of sample thereof, comprise the following steps:
S00: need according to technique, expanded rubber raw material is mixed according to a certain percentage, is placed in vacuum ring
Border carries out de-bubble process, is then injected in described metallic cavity, starts described temperature control system and controls described
Metallic cavity described in heating coils heat, to expanded rubber technological temperature, determines molding time, until described swollen
Swollen rubbery sample is molded, and in forming process, utilizes described pressure head to ensure the raw material that specimen surface is smooth, unnecessary
Flow out from described flash mouth, complete the preparation of described expanded rubber sample;
S01: described metallic gasket is placed on the top of described expanded rubber sample, starts described temperature and controls
System controls described heating coil, sets multiple temperature platform respectively, observes and record under each temperature platform
Institute's displacement measurement device tests the reading change of described metallic gasket displacement, calculates the coefficient of cubical expansion;
S02: described metallic gasket is placed into the top of described expanded rubber sample, by two described mechanics examinations
Testing compressing head and clamp described base and described metallic gasket respectively, adjustment contact is preset value, and sets
Described mechanical test compressing head is displacement constant-mode, starts described temperature control system and controls described heater wire
Circle, sets multiple temperature platform respectively, observes and record described load record system under each temperature platform
Reading changes, and calculates the bulbs of pressure change of described expanded rubber sample;
S03: obtain bulk modulus value according to bulk modulus computing formula.
As the preferred version of the present invention, described step S01 is implemented according to following steps:
S011: start described temperature control system and control described heating coils heat, make described metallic cavity
Temperature raises (reduction), reaches temperature T;
S012: record institute displacement measurement device reaches the reading of stable state;
S013: be repeated in described step S011 and S012, until multiple temperature platform has all recorded.
As the preferred version of the present invention, described step S02 is implemented according to following steps:
S021: start described temperature control system and control described heating coil, make the temperature of described metallic cavity
Raise (reduction), reach temperature T ';
S022: record described load record system and reach the reading of stable state;
S023: be repeated in described step S021 and S022, until multiple temperature platform has all recorded.
The invention have the benefit that
The invention provides the test of expanded rubber bulk modulus and sample preparation device thereof, be that collection expands rubber
The preparation of glue sample and bulk modulus thereof are tested in one, effectively prevent owing to sample processing causes
The scale error impact on test accuracy, farthest simulates expanded rubber true at thermal expansion technique
Under the conditions of duty, it is ensured that bulk modulus quickly, test easily and accurately, for effectively controlling
Thermal expansion technique forming composite parts quality provides safeguard.
Present invention also offers the test of expanded rubber bulk modulus and preparation method of sample, the method energy
Enough effectively changing employing " trial-and-error method " determines the present situation of thermal expansion technique heat expansion pressure, and a large amount of saving is tested into
This, it is ensured that is by the bulk modulus measured by the present invention to the Accurate Prediction of heat expansion pressure in actual process
And effectively control, it is with a wide range of applications in Composite Thermal Expansion technology field.
Accompanying drawing explanation
Fig. 1 is that the expanded rubber bulk modulus that the embodiment of the present invention one provides is tested and sample preparation dress
The structural representation of the metallic cavity put;
Fig. 2 is the device schematic diagram of the expanded rubber coefficient of cubical expansion test that the embodiment of the present invention one provides;
Fig. 3 is the device schematic diagram of the expanded rubber heat expansion pressure test that the embodiment of the present invention one provides;
Fig. 4 is that the expanded rubber bulk modulus that the embodiment of the present invention two provides is tested and sample preparation side
The flow chart of method;
Fig. 5 is the flow chart of the expanded rubber coefficient of cubical expansion test that the embodiment of the present invention two provides;
Fig. 6 is the flow chart of the expanded rubber heat expansion pressure test that the embodiment of the present invention two provides.
Wherein:
1, metallic cavity;2, temperature control system;3, heating coil;4, dial gauge;5, metallic gasket;
6, the first thermocouple;7, load record system;8, mechanical test compressing head;10, expanded rubber;
11, base;12, metal barrel;13, fastening bolt;14, pressure head;
121, the first putting hole;141, flash mouth;142, the second putting hole.
Detailed description of the invention
Further illustrate technical scheme below in conjunction with the accompanying drawings and by detailed description of the invention.
Embodiment one
As shown in Figure 1 to Figure 3, present embodiments provide the test of a kind of expanded rubber bulk modulus and
Sample preparation device, it includes for placing the metallic cavity 1 of expanded rubber sample coupon, temperature control system
2, metallic gasket 5, pressure head 14, displacement measuring device and load acquisition system.
Wherein, metallic cavity 1 includes base 11 and metal barrel 12, and the periphery of metal barrel 12 is arranged with
Heating coil 3, base 11 is connected with metal barrel 12 by fastening bolt 13.
Pressure head 14 coordinates the preparation carrying out expanded rubber sample 10 with metallic cavity 1, and pressure head 14 has can be stretched
Entering the press section in metal barrel 12, pressure head 14 is provided with and runs through press section and lead to overflowing outside pressure head 14
Material mouth 141, pressure head 14 is provided with the second putting hole 142 installing the second thermocouple.
Temperature control system 2 is at preparation, coefficient of cubical expansion test and the heat expansion pressure of expanded rubber sample 10
Controlling heating coil 3 in test process and heat metallic cavity 1, it includes for detecting metallic cavity 1 temperature
First thermocouple 6, in the first putting hole 121 that the first thermocouple 6 is arranged on metal barrel 12.
When temperature control system 2 control heating coil 3 heats metallic cavity 1, the first thermocouple 6 is control
Warm galvanic couple, it is possible to control to adjust heating-up temperature and test and heat expansion pressure test temperature to the coefficient of cubical expansion,
Realize the test of the bulk modulus of expanded rubber.Heat when temperature control system 2 controls heating coil 3
Metallic cavity 1, the second thermocouple is temperature thermocouple, it is possible to sensing detects expanded rubber sample forming temperature,
It is easy to the shaping of Control Assay part.The use of metallic cavity 1 ensures sample coupon accuracy of gauge, thus ensures
The reliability of test result.
Metallic gasket 5 is tested and in heat expansion pressure test sequence at the coefficient of cubical expansion of expanded rubber sample 10
It is arranged at the inwall of the top of expanded rubber sample 10, metallic gasket 5 shape and size and metal barrel 12
Suitable, metallic gasket 5 arrange can the upper surface flatness of effective Control Assay, to ensure sample chi
The accuracy of very little test.
Displacement measuring device, it is for measuring in the coefficient of cubical expansion test process of expanded rubber sample 10
The change in displacement of metallic gasket 5.The present embodiment is preferably, and displacement measuring device is dial gauge 4, dial gauge 4
It is to utilize rack pinion or lever-gear transmission, the straight-line displacement of measuring staff is become the metering of the angular displacement of pointer
Utensil, it is generally by gauge head, gauge rod, antirattle spring, tooth bar, gear, hairspring, round dial and pointer etc.
Composition, has highly sensitive and measures accurate advantage, being effectively increased the expansion of detection expanded rubber sample
The accuracy of change in displacement.
Load acquisition system, expands rubber for measuring in the heat expansion pressure test sequence of expanded rubber sample 10
The bulbs of pressure change that glue sample 10 produces because of expanded by heating, it includes load record system 7 and and load
Two mechanical test compressing heads 8 that record system 7 is all connected, load record system 7 is used for recording different temperatures
The bulbs of pressure of lower expanded rubber sample 10, one of them mechanical test compressing head 8 is arranged at metallic gasket 5
Top, another mechanical test compressing head 8 is arranged at the lower section of base 11, two mechanical test compressing heads
8 difference Holding seat 11 and metallic gaskets 5, and then the expanded rubber sample that clamping is placed in metallic cavity 1
10, conveniently and accurately test the bulbs of pressure of expanded rubber.
The expanded rubber bulk modulus test of the present embodiment and sample preparation device thereof, be collection expanded rubber
The preparation of sample and bulk modulus thereof are tested in one, it is achieved that controlling in real time and accurate of important parameter
Test, effectively prevent owing to sample processes the scale error the caused impact on test accuracy, maximum journey
Spend simulation expanded rubber duty under thermal expansion technique full-scale condition, it is ensured that bulk modulus
Quick, test easily and accurately, carry for effectively controlling thermal expansion technique forming composite parts quality
For ensureing.
Embodiment two
As Figure 4-Figure 6, present embodiments provide a kind of for the expanded rubber body as described in embodiment one
Prepared by long-pending elastic modelling quantity test and the expanded rubber bulk modulus test of sample preparation device and sample thereof thereof
Method, the method comprises the following steps:
S00: need according to technique, expanded rubber raw material is mixed according to a certain percentage, is placed in vacuum ring
Border carries out de-bubble process, is then injected in metallic cavity 1, and start-up temperature control system 2 controls heating coil 3
Heating metallic cavity 1 to expanded rubber technological temperature, determines molding time, until expanded rubber sample 10 becomes
Type, in forming process, utilizes pressure head 14 to ensure that specimen surface is smooth, and unnecessary raw material flows from flash mouth 141
Go out, complete the preparation of expanded rubber sample 10.
Preferably, two-component silicone rubber Sample A ircast3600 is such as prepared.Component A and B component are pressed
After certain proportion (such as: 10:1) mixes, place in vacuum environment and carry out de-soak process in 10 minutes.
After de-soak terminates, raw material mixed liquor being slowly injected into metallic cavity 1, start-up temperature control system 2 controls heating
Coil 3 heats metallic cavity 1 to expanded rubber technological temperature 60 DEG C, utilizes the second thermocouple to reach to expand rubber
After adhesive process temperature, and stand shaping in 2 hours 60 DEG C of conditions.
S01: metallic gasket 5 is placed into the top of expanded rubber sample 10, start-up temperature control system 2
Control heating coil 3, set multiple temperature platform respectively, observe and record each temperature platform bottom offset and measure
The reading change of device to test metallic gasket 5 displacement, obtains coefficient of cubical expansion αV, wherein, the present embodiment
Displacement measuring device be preferably dial gauge 4.
Preferably, step S01 is implemented according to following steps:
S011: start-up temperature control system 2 controls heating coil 3 and heats, and makes the temperature liter of metallic cavity 1
High (reduction), reaches temperature T;
In this embodiment, for two-component silicone rubber Sample A ircast3600, it is 30mm by height,
The silicon rubber cylinder of a diameter of 25mm is positioned in metallic cavity 1, temperature T of heating can be 60 DEG C,
90℃、120℃、150℃、180℃。
S012: record displacement measuring device reaches the reading of stable state;
In heating process, owing to the expanded rubber coefficient of heat conduction is relatively low, expanded rubber temperature slowly rises,
The reading of dial gauge 4 is continually changing, when reading reaches stable state, the reading of record dial gauge 4.
S013: be repeated in step S011 and S012, until multiple temperature platform has all recorded.
Formula (1) is utilized to calculate its thermalexpansioncoefficientα.
Wherein, the elemental height of L silicon rubber sample;
The height that after Δ L heating, silicon rubber sample expands;
Δ T and the temperature difference of room temperature.
By test, it can be deduced that the swell increment of Aircast3600 silicon rubber in Range of measuring temp along with
The rising of temperature and linearly increasing.
Owing to Aircast3600 silicon rubber specimen cross sectional area is fixed, therefore, coefficient of cubical expansion αVMeter
Calculation formula is:
Wherein, the initial volume of V silicon rubber sample;
The volume that after Δ V heating, silicon rubber sample expands;
Δ T and the temperature difference of room temperature.
Understanding according to formula (1) and formula (2), the thermalexpansioncoefficientα recorded is coefficient of cubical expansion αV。
S02: metallic gasket 5 is placed into the top of expanded rubber sample 10, by two mechanics machine pressures
8 Holding seat 11 and metallic gaskets 5 respectively, adjustment contact is preset value, such as 10 newton, and sets
Determining mechanical test compressing head 8 is displacement constant-mode, and start-up temperature control system 2 controls heating coil 3, point
Do not set multiple temperature platform, observe and record the reading change of load record system 7 under each temperature platform,
Obtain the bulbs of pressure changing value of expanded rubber sample 10Wherein, the multiple temperature in step S01 are put down
Platform can be the most corresponding with the multiple temperature platforms in step S02, it is also possible to the most corresponding.
Preferably, step S02 is implemented according to following steps:
S021: start-up temperature control system 2 controls heating coil 3, makes the temperature of metallic cavity 1 raise (fall
Low), reach temperature T ';
Temperature T ' in the present embodiment may be set in room temperature in the range of 180 DEG C.
S022: record load record system 7 reaches the reading of stable state;
In heating process, owing to the expanded rubber coefficient of heat conduction is relatively low, expanded rubber temperature slowly rises,
The reading of load record system 7 is continually changing, and when reading reaches stable state, records load record system 7
Reading.
S023: be repeated in step S021 and S022, until multiple temperature platform has all recorded, by note
The bulbs of pressure change of record and temperature change, obtain bulbs of pressure changing value
S03: obtain bulk modulus value K according to bulk modulus computing formulaVT。
Bulk modulus value KVTComputing formula be:
Wherein, the initial volume of Δ V silicon rubber sample;
The pressure change amount of Δ P silicon rubber sample;
The volume change of Δ V silicon rubber sample.
Formula (2) is substituted in formula (3), bulk modulus value K can be obtainedVTComputing formula as follows:
Wherein, αVThe coefficient of cubical expansion of silicon rubber sample;
The pressure change amount of Δ P silicon rubber sample;
The temperature variation of silicon rubber sample corresponding with Δ P for Δ T.
In the range of room temperature to 180 DEG C, the heat expansion pressure of Aircast3600 silicon rubber sample is along with temperature liter
High and linearly increasing, the change in displacement obtained according to thermal coefficient of expansion method of testing and heat expansion method for testing pressure
The bulbs of pressure change obtained, final acquisition bulk modulus value KVT。
By implementing said method, it is possible to effectively change " trial-and-error method " used and determine thermal expansion technique heat expansion
The present situation of pressure, substantial saving in experimentation cost, it is ensured that by the bulk modulus pair measured by the present invention
The Accurate Prediction of heat expansion pressure and effectively controlling in actual process, has in Composite Thermal Expansion technology field
It is widely applied prospect.
The know-why of the present invention is described above in association with detailed description of the invention.These describe and are intended merely to explain
The principle of the present invention, and limiting the scope of the invention can not be construed to by any way.Based on herein
Explanation, those skilled in the art need not to pay performing creative labour can associate other of the present invention
Detailed description of the invention, these modes fall within protection scope of the present invention.
Claims (8)
1. the test of expanded rubber bulk modulus and sample preparation device thereof, including temperature control system (2)
And displacement measuring device, it is characterised in that
Including metallic cavity (1), it includes base (11) and metal barrel (12), described metal barrel
(12) periphery is arranged with heating coil (3);
Pressure head (14), it coordinates the preparation carrying out expanded rubber sample (10) with described metallic cavity (1);
Described pressure head (14) has the press section that can stretch in described metal barrel (12), described pressure head (14)
It is provided with and runs through described press section and lead to the flash mouth (141) that described pressure head (14) is outside;
Described temperature control system (2) is at the preparation of described expanded rubber sample (10), the coefficient of cubical expansion
Test and heat expansion pressure test sequence control described heating coil (3) and heats described metallic cavity (1);
Metallic gasket (5), it is tested and heat expansion at the coefficient of cubical expansion of described expanded rubber sample (10)
Pressure test sequence is arranged at the top of described expanded rubber sample (10), described metallic gasket (5)
Shape and size are suitable with the inwall of described metal barrel (12);
Institute's displacement measurement device was tested for the coefficient of cubical expansion described expanded rubber sample (10)
Journey is measured the change in displacement of described metallic gasket (5);
Load acquisition system, for surveying in the heat expansion pressure test sequence of described expanded rubber sample (10)
Measuring the bulbs of pressure change that described expanded rubber sample (10) produces because of expanded by heating, it includes that load is remembered
Recording system (7) and two the mechanical test compressing heads (8) being all connected with described load record system (7),
Described load record system (7) is used for recording the turgor pressure of described expanded rubber sample (10) under different temperatures
Power, one of them described mechanical test compressing head (8) is arranged at the top of described metallic gasket (5), separately
One described mechanical test compressing head (8) is arranged at the lower section of described base (11).
Expanded rubber bulk modulus the most according to claim 1 test and sample preparation dress thereof
Put, it is characterised in that
Described temperature control system (2) includes the first thermoelectricity for detecting described metallic cavity (1) temperature
Even (6), described first thermocouple (6) is arranged at the first putting hole (121) on described metal barrel (12)
In.
Expanded rubber bulk modulus the most according to claim 1 test and sample preparation dress thereof
Put, it is characterised in that
The second putting hole (142) installing the second thermocouple it is provided with on described pressure head (14).
Expanded rubber bulk modulus the most according to claim 1 test and sample preparation dress thereof
Put, it is characterised in that
Described base (11) is connected with described metal barrel (12) by fastening bolt (13).
Expanded rubber bulk modulus the most according to claim 1 test and sample preparation dress thereof
Put, it is characterised in that
Institute's displacement measurement device is dial gauge (4).
6. one kind for described in claim 1-5 any one expanded rubber bulk modulus test and
The expanded rubber bulk modulus test of its sample preparation device and preparation method of sample thereof, its feature exists
In,
Comprise the following steps:
S00: need according to technique, expanded rubber raw material is mixed according to a certain percentage, is placed in vacuum
Environment carries out de-bubble process, is then injected in described metallic cavity (1), starts described temperature control system (2)
Control described heating coil (3) and heat described metallic cavity (1) to expanded rubber technological temperature, determine into
The type time, until described expanded rubber sample (10) shaping, in forming process, utilize described pressure head (14)
Ensureing that specimen surface is smooth, unnecessary raw material flows out from described flash mouth (141), completes described expanded rubber
The preparation of sample (10);
S01: described metallic gasket (5) is placed on the top of described expanded rubber sample (10), starts
Described temperature control system (2) controls described heating coil (3), sets multiple temperature platform respectively, sees
Examine and record the reading of institute's displacement measurement device test described metallic gasket (5) displacement under each temperature platform
Change, calculates the coefficient of cubical expansion;
S02: described metallic gasket (5) is placed into the top of described expanded rubber sample (10), by two
Individual described mechanical test compressing head (8) clamps described base (11) and described metallic gasket (5) respectively,
Adjustment contact is preset value, and to set described mechanical test compressing head (8) be displacement constant-mode, opens
Dynamic described temperature control system (2) controls described heating coil (3), sets multiple temperature platform respectively,
Observe and record the reading change of described load record system (7) under each temperature platform, calculate described expansion
The bulbs of pressure change of rubbery sample (10);
S03: obtain bulk modulus value according to bulk modulus computing formula.
Expanded rubber bulk modulus the most according to claim 6 test and sample preparation side thereof
Method, it is characterised in that
Described step S01 is implemented according to following steps:
S011: start described temperature control system (2) and control the heating of described heating coil (3), make described
The temperature of metallic cavity (1) raises (reduction), reaches temperature T;
S012: record institute displacement measurement device reaches the reading of stable state;
S013: be repeated in described step S011 and S012, until multiple temperature platform has all recorded.
Expanded rubber bulk modulus the most according to claim 6 test and sample preparation side thereof
Method, it is characterised in that
Described step S02 is implemented according to following steps:
S021: start described temperature control system (2) and control described heating coil (3), make described metal
The temperature of cavity (1) raises (reduction), reaches temperature T ';
S022: record described load record system (7) and reach the reading of stable state;
S023: be repeated in described step S021 and S022, until multiple temperature platform has all recorded.
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