CN1519555A - Tester for measuiring bending stress and strain of refractory materials under high temperature - Google Patents
Tester for measuiring bending stress and strain of refractory materials under high temperature Download PDFInfo
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- CN1519555A CN1519555A CNA031263313A CN03126331A CN1519555A CN 1519555 A CN1519555 A CN 1519555A CN A031263313 A CNA031263313 A CN A031263313A CN 03126331 A CN03126331 A CN 03126331A CN 1519555 A CN1519555 A CN 1519555A
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Abstract
Mechanism of showing difference is added to folding strength testing machine for fire-resisting material in high temp. The said mechanism includes an inner tube of showing difference moved as flexural deformation of sample measured. The said inner tube is supported inside outer tube of showing difference. The said outer tube is supported by low end of brick cup, and the inner tube is connected to displacement transducer. The invented device is utilized to test bending stress-strain relation of fire-resisting material under a temp, or folding strength and corresponding maximum deflection. Moreover, rate of winding creep deformation in high temp can be measured in the device. Characters of the device are that a mechanism of showing difference is utilized in three point bending mechanism for showing deflection. Range of measuring temp is 25 -1700 deg.C, and measurement atmosphere is air atmosphere, reducing atmosphere and inert atmosphere.
Description
(1) technical field:
The present invention relates to a kind of tester, relate in particular to a kind of deflection of fire resistive material when high temperature and different atmosphere lower stress and fire resistive material hot bending stress-strain test instrument of stress-strain relation tested.
(2) background technology:
The mechanical behavior under high temperature of measuring fire resistive material is to judge the important indicator of capabilities of refractory materials quality, and international for this reason, the domestic parties concerned have formulated some standards.In the standard of having announced, standard GB/T3002-82, IS05013-85 is a refractory product high temperature break resistant intensity test method, its principle is: sample is heated to test temperature, and under this temperature, remain to the Temperature Distribution of regulation, with constant rate of loading sample is applied tension stress then, up to destruction.The maximum stress that the record sample can bear is by calculating the high temperature break resistant intensity that can get sample, to judge the high-temperature mechanical property of sample.
In above-mentioned standard: stipulated that sample is the rectangular parallelepiped sample, it is of a size of 125 * 25 * 25mm, has stipulated that the heating rate of heating furnace is preferably 4-6 ℃/min, and test temperature is 100 ℃ a multiple, and the temperature difference of sample middle part, insulation back is no more than ± and 2 ℃.The loading speed of having stipulated loading mechanism is: setting density fireproof goods: (0.15N.mm
-2.S
-1± 10%); Heat insulation refractory product: 0.05N.mm
-2.S
-1± 10%.
In heating process, refractory products can produce deformation when stressed.Judge that refractory products can bear the size of stress and the deflection that produces is most important to the serviceable life of refractory products.By contrast, judge that maximum stress that refractory products can bear is than judging that the maximal destruction stress that this refractory products can bear is even more important in elastic deformation.In the fire resistive material of reality is used, all exist and declare the problem of knowing its stress-strain relation as the shear stress of the compressive stress of the tension stress of furnace roof, furnace bottom, furnace wall.
(3) summary of the invention:
Can only test the problem that fire resistive material can not be tested its deflection at the maximum stress in when fracture in order to solve present fire resistive material high temperature break resistant intensity testing machine, the invention provides the fire resistive material hot bending stress-strain test instrument of a kind of energy measurement fire resistive material sample strain-stress relation, fire resistive material high temperature break resistant intensity and corresponding maximum deformation quantity and fire resistive material hot bending deformation of creep rate under a certain temperature.
Technical scheme of the present invention realizes in the following manner: a kind of fire resistive material hot bending stress-strain test instrument, it is to increase by a differential mechanism on fire resistive material high temperature break resistant intensity testing machine, it is characterized in that: this differential mechanism comprise one with the distortion of specimen mobile interior differential pipe, interior differential pipe is supported in the outer differential pipe, outer differential pipe upper end is tight against below brick cup, and interior differential pipe upper end passes that brick cup is against below the sample, its lower end is connected with displacement transducer.
Differential mechanism bottom is sealed in the seal box that is connected with body of heater so that sample is carried out atmosphere protection.
The lower end of outer differential pipe is positioned on the outer differential base, and outer differential base is supported on the fixed support by outer differential pipe setting nut and the coupled spring of following, and fixed support is connected with drop-bottom.
Interior differential pipe lower end connects differential base in, interior differential base is followed spring by an interior differential pipe and is supported on the interior differential pipe setting nut, interior differential pipe setting nut is connected with outer differential tube socket lower end, and interior differential base is connected with the displacement transducer shell by the sensor gib screw.
Interior differential pipe top closure, interior dress temperature thermocouple.
Be provided with the groove of three groups six the following edges of a knife of putting different spacing above the brick cup so that regulate the distance of the edge of a knife down according to sample size.
Outer differential pipe is made by the alundum tube of Φ 16 * Φ 12 * 320mm, and interior differential pipe is made by the alundum tube of the end sealing of Φ 8 * Φ 6 * 420mm; The high-strength high temperature-resistant pressure bar of the last edge of a knife for making by the recrystallized silicon carbide material, the range of displacement transducer is 10mm, resolution is 1-20 μ m.
It is 25 ℃-1700 ℃ that temperature range is measured by differential mechanism, and it measures deformation range is 0～10mm, and resolution is 1-20 μ m.
Good effect of the present invention is:
1, the present invention combines loading system, heating system and deformation measuring system, has realized that sample can carry out the test of stress-strain property under heating status;
2, temperature can effectively be eliminated in measuring process to the interference of measuring system by differential of the present invention mechanism;
3, loading system of the present invention can be finished multiple mode loading, and for example certain rate of loading, the rate of loading of change, round loading, maintenance constant stress etc. have effectively guaranteed the enforcement of experimental technique.
4, the present invention can finish under the different atmosphere test to sample.
(4) description of drawings
Fig. 1 is a cross-sectional view of the present invention.
Fig. 2 for the present invention and body of heater, reach the structural representation that each operating system is assembled into one.
(5) embodiment
The invention will be further described below in conjunction with accompanying drawing:
By Fig. 1, Fig. 2 as can be seen: this fire resistive material hot bending stress-strain test instrument,
Can find out also that by Fig. 1 pressure head 1 can be high temperature resistant, can be to sample 2 stress applications.The bending stress of sample 2 is mainly finished by pressure head 1, the following edge of a knife 3, brick cup 5.The stress that applies can be sent to computing machine by the sensor of pressure head 1 top.
Can find out also that by Fig. 1 it will occur bending and deformation when sample is subjected to stress.Differential pipe 6 moved up and down in this distortion can drive, and differential base 12 passed to-displacement transducer 16 in this moved through.Displacement transducer 16 will produce an electric signal and give computing machine, thereby record the hot bending distortion of sample 2.
Can find out also that by Fig. 1 the upper end of outer differential pipe 7 is followed spring 10 by-outer differential pipe and is tight against lower plane at brick cup 5.The lower end of outer differential pipe 7 links to each other with-outer differential base 11, and outer differential base 11 links to each other with the shell of displacement transducer 16 by-Nei differential pipe setting nut 13.If regulate the followability of 7 pairs of brick cups 5 of outer differential pipe, can regulate outer differential pipe setting nut 9,9 times timings of setting nut are followed pressure increase, otherwise reduce.
Can be found out also that by Fig. 3 differential mechanism follows spring 10 by outer differential pipe to place on the fixed support 8, fixed support 8 links to each other with drop-bottom 17.
Can be found out also that by Fig. 1 the followability of 6 pairs of samples 2 of differential pipe in will regulating can be finished by differential pipe setting nut 11 in regulating, because interior differential pipe is followed the elastic reaction of spring 14, upwards then pressure increases, otherwise then reduces.
Also can find out by Fig. 1, because the measuring error that the distortion that interior differential pipe has adopted identical material can effectively eliminate bottom brick 18 causes because the deflection of brick cup 5 is known, has been done effective background deduction in computing machine.So absolute deformation amount that is deformed into sample of measured sample 2.The spacing of the following edge of a knife 4 can be 100mm, 80mm, 60mm.
As seen from Figure 2, deformation measurement differential mechanism places in the seal box 30 of the anti-folding instrument lower end of testing fire resistive material sample high temperature break resistant intensity function, outer differential pipe is made by the alundum tube of Φ 16 * Φ 12 * 320mm, its upper end props up the lower plane of high-strength high temperature-resistant base 5, interior differential pipe 6 is made by the alundum tube of the end sealing of Φ 8 * Φ 6 * 420mm, and its upper end is butted on sample; The range of displacement transducer is 10mm, and resolution is 20 μ m, and its output signal can be by computer acquisition.
As seen from Figure 2, the measuring principle of ess-strain is identical with Fig. 1.Loading system is one to be installed on the lever system of body of heater 28, comprise successively the buncher 19, the turn-screw 20 that connect, load weights 21, lever 22, be connected the force transducer 23 on the lever 22, pressure bar is transferred long nut 25, water cooling ring 26, connector 27 is equipped with on the body of heater between wiring aluminium row 24, fire door 33, fire door 33 and the body of heater and is provided with sealing strip 32; Seal box 30 is provided with gland bonnet 31; Rate of loading is controlled by buncher 19, and after operating personnel configured parameter, computing machine just can be controlled the rotating speed of buncher 19.Thereby controlled the speed that seesaws that loads counterweight 21, also just controlled rate of loading.The range of this loading system is divided into two grades, i.e. 5KN, and 10KN can realize by strength journey adjustment hole 34; The force transducer of this loading system is the pressure transducer of 10KN, and resolution is 1N, and its power value can be by computer acquisition; Made by silicon nitride combined silicon carbide material by the last edge of a knife that the high-strength high temperature-resistant pressure bar is made, edge of a knife radius is 5mm; High-strength high temperature-resistant base 5 is made by corundum material, and 3 groups of top flute pitch are 100mm, 80mm, and 60mm, center bore are Φ 10mm; The following edge of a knife 4 is made by corundum material, and its specification is Φ 10 * 50mm.In Fig. 2, heating furnace is that the body of heater of a sealing can feed different gas.Sample 2 places the center of burner hearth 3, and the heater 29 in the burner hearth 3 is an electric heating body; Temperature in the burner hearth 3 reaches as high as 1700 ℃, and the center temperature difference is ± 5 ℃; Gaseous tension is less than 0.6Mpa in the burner hearth.The body of heater shell of this heating furnace is a metal shell, can firmly connect loading mechanism and deformation measurement mechanism, makes instrument become as a whole.
Be concrete testing procedure below to three kinds of performance tests of fire resistive material sample:
Example one: the method for testing of fire resistive material hot bending stress-strain relation
1, preparation sample: on second-class high-alumina brick, cut one on 25 * 25 * 125 rectangular parallelepiped sample, with the width and the height at vernier caliper measurement sample middle part, and with this data input computing machine.
2, as shown in Figure 2, sample is put on the following edge of a knife fulcrum 4 of burner hearth 3, the height of differential pipe 6 in adjusting makes it prop up the sample below, shuts fire door 33, opens host power switch.
3, at normal temperatures with 10N/cm
2.s loading speed applies bending stress to sample, when stress value reaches 8MPa, discharge stress with same speed immediately, in the reciprocal process of this stress, deflection every a sample of 1MPa record can obtain the stress-strain diagram of second-class high-alumina brick at normal temperatures.
4, heating sample to 200 ℃, and with above-mentioned same method sample is carried out stress after being incubated 30 minutes and back and forth test, 200 ℃ of stress-strain diagrams under the condition can be obtained.
5, in kind do 400,600,800,1000,1200 and 1300 (℃) stress back and forth test, can obtain the stress-strain diagram of second-class high-alumina brick under these temperature respectively thus.
6, according to the stress-strain diagram under the different temperatures, the elastic range that can obviously judge second-class high-alumina brick is a normal temperature to 400 ℃, and plastic range is 600 ℃ ~ 1200 ℃, and the VISCOUS FLOW temperature starts from 1300 ℃.
Example two: the test of fire resistive material high temperature break resistant intensity and corresponding maximum deformation quantity:
1. step is with 1,2 of example one.
2. by following temperature programme.0～1000 ℃: 10 ℃/min; 1000 ℃～1400 ℃: 5 ℃/min; 1400 ℃ of insulation 30min.After insulation finishes, with 10N/cm
2.S rate of loading to the sample loading up to sample fracture, maximum stress that computing machine will be born in the time of will writing down sample fracture automatically and corresponding maximum flexibility amount.
Example three: the test of fire resistive material hot bending deformation of creep rate
1. step is with 1,2 of example one.
2. by following temperature programme and 0～1000 ℃ of insulation, 10 ℃/min; 1000 ℃～1300 ℃, 5/min; 1300 ℃.Insulation 210min.
3, when temperature retention time arrives 30min, with 8N/cm
2.S rate of loading when stress value reaches 0.2Mpa, stops loading to the sample loading, observes the also flexural deformation and the time relationship of recording materials under constant temperature and pressure.
4, according to formula, calculate the hot bending deformation rate of fire resistive material, computing formula is as follows:
In the formula: P---the bending creep deformation rate
The original height of Li---sample.
The deflection of Lo---sample when constant voltage begins.
Ln---the deflection of sample constant voltage in the time of n minute.
Claims (9)
1, a kind of fire resistive material hot bending stress-strain test instrument, it is to increase by a differential mechanism on fire resistive material high temperature break resistant intensity experimental machine, it is characterized in that: this differential mechanism comprise one with the distortion of specimen mobile interior differential pipe (6), interior differential pipe is supported in the outer differential pipe (7), outer differential pipe upper end is tight against below brick cup (5), and interior differential pipe (6) upper end passes that brick cup (5) is against below the sample (2), the lower end is connected with displacement transducer (16).
2, according to claim 1 described fire resistive material hot bending stress-strain test instrument, it is characterized in that: differential mechanism bottom is sealed in the seal box (30) that is connected with body of heater (28).
3, according to claim 2 described fire resistive material hot bending stress-strain test instrument, it is characterized in that: the lower end of outer differential pipe (7) is positioned on the outer differential base (11), outer differential base is supported on the support (8) by outer differential pipe setting nut (9) and the coupled spring (10) of following, and fixed support (8) is connected with drop-bottom (17).
4, according to claim 3 described fire resistive material hot bending stress-strain test instrument, it is characterized in that: interior differential pipe (6) lower end connects differential base (12) in, interior differential base (12) is followed spring (14) by an interior differential pipe and is supported on the interior differential pipe setting nut (13), interior differential pipe setting nut (13) is connected with outer differential tube socket (11) lower end, and interior differential base (12) is connected with displacement transducer (16) shell by sensor gib screw (15).
5, according to described fire resistive material hot bending of claim 1-4 stress-strain test instrument, it is characterized in that: interior differential pipe (6) top closure, interior dress temperature thermocouple.
6, according to claim 5 described arbitrary fire resistive material hot bending stress-strain test instrument, it is characterized in that: on brick cup (5), be provided with three groups of six grooves of putting the following edge of a knife of different spacing.
7, according to claim 6 described arbitrary fire resistive material hot bending stress-strain test instrument, it is characterized in that: outer differential pipe (7) is made by the alundum tube of Φ 16 * Φ 12 * 320mm, and interior differential pipe (6) is made by the alundum tube of the end sealing of Φ 8 * Φ 6 * 420mm.
8, according to claim 7 described fire resistive material hot bending stress-strain test instrument, it is characterized in that: go up the high-strength high temperature-resistant pressure bar of the edge of a knife for being made by the recrystallized silicon carbide material, the range of displacement transducer 16 is 10mm, and resolution is 1-20 μ m.
9, according to claim 8 described fire resistive material hot bending stress-strain test instrument, it is characterized in that: it is 25 ℃-1700 ℃ that temperature range is measured by differential mechanism.It measures deformation range is 0～10mm, and resolution is 1-20 μ m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03126331 CN1217177C (en) | 2003-09-02 | 2003-09-02 | Tester for measuiring bending stress and strain of refractory materials under high temperature |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03126331 CN1217177C (en) | 2003-09-02 | 2003-09-02 | Tester for measuiring bending stress and strain of refractory materials under high temperature |
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| Publication Number | Publication Date |
|---|---|
| CN1519555A true CN1519555A (en) | 2004-08-11 |
| CN1217177C CN1217177C (en) | 2005-08-31 |
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| CN 03126331 Expired - Fee Related CN1217177C (en) | 2003-09-02 | 2003-09-02 | Tester for measuiring bending stress and strain of refractory materials under high temperature |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100359317C (en) * | 2005-08-26 | 2008-01-02 | 中国科学院金属研究所 | Method and device for three-point bending mechanical property test of small-sized sheet sample |
| CN100429474C (en) * | 2004-12-23 | 2008-10-29 | 大连理工大学 | Chrome nickel steel or nickel steel high temperature displacement transducer |
| CN103604744A (en) * | 2013-11-19 | 2014-02-26 | 河南海格尔高温材料有限公司 | Experimental method for characterizing bonding strength of old and new materials of castable for ladle |
| CN103743627A (en) * | 2013-12-26 | 2014-04-23 | 中国石油集团钻井工程技术研究院江汉机械研究所 | Rapid testing device for toughness of thermal spraying coating and utilization method |
| CN106053250A (en) * | 2016-05-31 | 2016-10-26 | 航天材料及工艺研究所 | Device and method for measuring superhigh temperature flexure elasticity modulus and fracture strain of material |
| CN106290130A (en) * | 2016-08-10 | 2017-01-04 | 东旭科技集团有限公司 | A kind of detection method of overflow brick ruggedness |
| CN108827136A (en) * | 2018-04-16 | 2018-11-16 | 西南石油大学 | A method of flexible strain transducer is prepared using waste and old thermosetting resin |
| CN108956326A (en) * | 2018-07-20 | 2018-12-07 | 四川省劲腾环保建材有限公司 | A kind of method and device detecting solid brick flexural strength |
| CN110779809A (en) * | 2018-12-21 | 2020-02-11 | 航天特种材料及工艺技术研究所 | 1050 ℃ -1700 ℃ three-point bending testing device |
| CN111103201A (en) * | 2019-12-30 | 2020-05-05 | 彩虹显示器件股份有限公司 | Thermal deformation load stress loading method for overflow brick |
| CN111504769A (en) * | 2020-05-27 | 2020-08-07 | 武汉科技大学 | Pressure transmission assembly of three-point bending loading device for testing flexural strength of refractory material |
| CN112344842A (en) * | 2020-10-06 | 2021-02-09 | 大连理工大学 | Device for testing and calibrating strain gauge in high-temperature environment |
-
2003
- 2003-09-02 CN CN 03126331 patent/CN1217177C/en not_active Expired - Fee Related
Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100429474C (en) * | 2004-12-23 | 2008-10-29 | 大连理工大学 | Chrome nickel steel or nickel steel high temperature displacement transducer |
| CN100359317C (en) * | 2005-08-26 | 2008-01-02 | 中国科学院金属研究所 | Method and device for three-point bending mechanical property test of small-sized sheet sample |
| CN103604744A (en) * | 2013-11-19 | 2014-02-26 | 河南海格尔高温材料有限公司 | Experimental method for characterizing bonding strength of old and new materials of castable for ladle |
| CN103604744B (en) * | 2013-11-19 | 2015-10-28 | 河南海格尔高温材料有限公司 | A kind of experimental technique characterizing the new and old material bond strength of pouring materialfor steel ladle |
| CN103743627A (en) * | 2013-12-26 | 2014-04-23 | 中国石油集团钻井工程技术研究院江汉机械研究所 | Rapid testing device for toughness of thermal spraying coating and utilization method |
| CN103743627B (en) * | 2013-12-26 | 2016-01-20 | 中国石油集团钻井工程技术研究院江汉机械研究所 | A kind of hot spray coating toughness device for quick testing and using method |
| CN106053250A (en) * | 2016-05-31 | 2016-10-26 | 航天材料及工艺研究所 | Device and method for measuring superhigh temperature flexure elasticity modulus and fracture strain of material |
| CN106290130A (en) * | 2016-08-10 | 2017-01-04 | 东旭科技集团有限公司 | A kind of detection method of overflow brick ruggedness |
| CN108827136A (en) * | 2018-04-16 | 2018-11-16 | 西南石油大学 | A method of flexible strain transducer is prepared using waste and old thermosetting resin |
| CN108827136B (en) * | 2018-04-16 | 2019-07-02 | 西南石油大学 | A method of flexible strain transducer is prepared using waste and old thermosetting resin |
| CN108956326A (en) * | 2018-07-20 | 2018-12-07 | 四川省劲腾环保建材有限公司 | A kind of method and device detecting solid brick flexural strength |
| CN110779809A (en) * | 2018-12-21 | 2020-02-11 | 航天特种材料及工艺技术研究所 | 1050 ℃ -1700 ℃ three-point bending testing device |
| CN111103201A (en) * | 2019-12-30 | 2020-05-05 | 彩虹显示器件股份有限公司 | Thermal deformation load stress loading method for overflow brick |
| CN111103201B (en) * | 2019-12-30 | 2021-11-09 | 彩虹显示器件股份有限公司 | Thermal deformation load stress loading method for overflow brick |
| CN111504769A (en) * | 2020-05-27 | 2020-08-07 | 武汉科技大学 | Pressure transmission assembly of three-point bending loading device for testing flexural strength of refractory material |
| CN112344842A (en) * | 2020-10-06 | 2021-02-09 | 大连理工大学 | Device for testing and calibrating strain gauge in high-temperature environment |
| CN112344842B (en) * | 2020-10-06 | 2021-09-24 | 大连理工大学 | Device for testing and calibrating strain gauge in high-temperature environment |
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