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CN103698073A - Device and method for testing fastening pressure of shape memory alloy pipe joint - Google Patents

Device and method for testing fastening pressure of shape memory alloy pipe joint Download PDF

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Publication number
CN103698073A
CN103698073A CN201310733618.4A CN201310733618A CN103698073A CN 103698073 A CN103698073 A CN 103698073A CN 201310733618 A CN201310733618 A CN 201310733618A CN 103698073 A CN103698073 A CN 103698073A
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wall
pressure
strain
memory alloy
shape memory
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CN103698073B (en
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鲁世强
李贵发
王克鲁
刘俊伟
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Nanchang Hangkong University
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Nanchang Hangkong University
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Abstract

一种形状记忆合金管接头紧固压力测试装置及其测试方法，被接管内壁对称粘贴两个应变片，应变片与动态应变测试仪相连接，四根钢丝绳分别穿过加载块的凹槽和固定滑轮后，在其末端加载重物，通过改变加载重物的重量来实现对被接管外壁施加不同的压力pi；利用动态应变测试仪测试在不同压力作用下粘贴在被接管内壁的应变片所产生的应变εi，从而获得被接管外壁压力p与内壁应变ε之间的标定关系曲线。利用该标定关系，可方便地测试出形状记忆合金管接头在加热恢复过程中对被接管所产生的紧固压力。A shape-memory alloy pipe joint fastening pressure test device and its test method. Two strain gauges are symmetrically pasted on the inner wall of the connected pipe. The strain gauges are connected with a dynamic strain tester. After the pulley, load a heavy object at its end, and apply different pressure pi to the outer wall of the connected pipe by changing the weight of the loaded heavy object; use a dynamic strain tester to test the strain gauges pasted on the inner wall of the connected pipe under different pressures. The strain ε i of the pipe, so as to obtain the calibration relationship curve between the outer wall pressure p and the inner wall strain ε of the pipe being taken over. Using this calibration relationship, the fastening pressure of the shape memory alloy pipe joint on the pipe to be taken over during the heating recovery process can be easily tested.

Description

A kind of marmem pipe joint fastening pressure proving installation and method of testing thereof
Technical field
The present invention relates to the test of marmem pipe joint fastening pressure, relate in particular to a kind of proving installation and method of testing thereof of marmem pipe joint fastening pressure.
Background technology
Airplane hydraulic pressure, traditional method of attachment pneumatic, fuel system are mainly enlarging connected mode, and this is extensive and the most ripe a kind of type of attachment.Yet this connected mode quality is heavy, complex structure, while being particularly connected with important load-carrying construction, larger to structural static strength and Fatigue Strength Effect, complex process, reliability is relative with security poor.At present, world's Advanced Aircraft is manufactured country and is extensively adopted marmem pipe joint without enlarging connected mode, and the fields such as China's Aeronautics and Astronautics, nuclear power have also started to adopt marmem pipe joint without enlarging connected mode.The pipeline connecting mode of this superior performance, the feature such as have not easy to leak, lightweight, installing space is little, replaces now widely used flared type to connect with it, can obviously strengthen reliability and the security of aircraft system.But fastening pressure how directly to measure marmem pipe joint it is not yet seen report, at present main by laboratory facilities such as " force of explosions " and " pulling-out force " indirectly, the fastening pressure of non-quantitationization ground estimation marmem pipe joint.This evaluation method operating cost is high, reliability is low, practicality is not strong.For the reliability of accurate evaluation marmem pipe joint without enlarging connected mode, engineering application is in the urgent need to a kind of apparatus and method that can directly measure marmem pipe joint fastening pressure.
Summary of the invention
A kind of proving installation and method of testing thereof of marmem pipe joint fastening pressure have been the object of the present invention is to provide.It can realize the direct measurement of the fastening pressure that marmem pipe joint pipeline connecting parts is produced in heating rejuvenation simply and easily.
The present invention is achieved like this: first by fastening pressure caliberating device, set up the outer wall pressure p of being taken over and the demarcation relation between inwall strain stress; Then utilize this demarcation relation, by fastening pressure proving installation, test the fastening pressure that marmem pipe joint produces in intensification rejuvenation.
Fastening pressure caliberating device comprises foil gauge, by adapter, arc steel plate, loading blocks, wire rope, pulley, bracing frame, add loads, dynamic strain measuring instrument and computing machine, it is characterized in that, by nozzle inner wall symmetry, posted foil gauge; Four arc steel plate equal altitudes, be close to and taken over outside surface equably, between adjacent arc steel plate, be provided with equidistant gap; Arc steel plate and loading blocks connect by being weldingly connected, and arc steel plate acts on equably and taken over outside surface for the power that loading blocks is passed over, and control position and the active area thereof of being taken over outside surface pressure; Loading blocks, for being transformed into the acting force to arc steel plate by adding loads, is applied a series of known pressure thereby realize to taking over outside surface; Each loading blocks is provided with the groove of four axles concentricity with it, is provided with the gap corresponding with arc steel plate interstitial site between loading blocks; Four wire rope are respectively through the groove of loading blocks, and every wire rope, respectively through after a pair of pulley, connects and adds loads at its end, and wherein the every pair of pulley symmetry is connected to the top of bracing frame.
Fastening pressure actual measurement device comprises by adapter, tested marmem pipe joint, foil gauge, dynamic strain measuring instrument and computing machine, it is characterized in that, by nozzle inner wall symmetry, posted foil gauge, the method for attaching of foil gauge is identical with the method for attaching in caliberating device.
The method of testing of described marmem pipe joint fastening pressure, is characterized in that, described method of testing comprises the following steps:
(1) taken over the foundation of demarcating relation between outer wall pressure p and inwall strain stress
A) according to structure described in claim 1, assemble caliberating device;
B) utilize caliberating device to be applied a series of known pressure pi to taking over;
C) test under different pressures effect by the corresponding strain stress of nozzle inner wall i;
D) draw the demarcation relation curve of being taken between outer wall pressure p and inwall strain stress;
E) curve is carried out to matching, set up the functional relation p=f (ε) being taken between outer wall pressure p and inwall strain stress;
(2) test of marmem pipe joint fastening pressure
A) marmem pipe joint is enclosed within and is taken over by engineering matching requirements;
B) according to structure described in claim 1, assemble actual measurement device;
C) marmem pipe joint pipeline connecting parts being put into heated oven heats up;
D) test in temperature-rise period by nozzle inner wall strain stress c, and be transferred to computing machine;
E) according to ε c, by computing machine, utilize the funtcional relationship of p=f (ε) to calculate and demonstrate the fastening pressure that marmem pipe joint produces in intensification rejuvenation.
Technique effect of the present invention is: proving installation of the present invention is small and exquisite, easy to operate, and test data is reliably directly perceived, has realized the direct measurement to marmem pipe joint fastening pressure, has solved the difficult problem that cannot directly measure it at present.
Accompanying drawing explanation
Fig. 1 is fastening pressure caliberating device structural representation of the present invention.
Fig. 2 is by the structure vertical view of adapter, arc steel plate and loading blocks in Fig. 1.
Fig. 3 is the section of structure of B-B in Fig. 2.
Fig. 4 is the section of structure of A-A in Fig. 2.
Fig. 5 is taken over outer wall in caliberating device to be subject to inwall strain testing figure under known pressure p effect.
Fig. 6 is taken over the demarcation relation curve between outer wall pressure p and inwall strain stress.
Fig. 7 is fastening pressure actual measurement device schematic diagram.
In the drawings, 1, taken over 2, arc steel plate 3, loading blocks 4, wire rope 5, added loads 6, bracing frame 7, pulley 8, foil gauge 9, wire 10, dynamic strain measuring instrument 11, computing machine 12, marmem pipe joint.
Embodiment
As shown in Figure 1, Figure 2, shown in Fig. 3, Fig. 4 and Fig. 5, the demarcation relation of the fastening pressure the present invention relates to is set up and is achieved like this, it comprises is taken over 1, arc steel plate 2, loading blocks 3, wire rope 4, is added loads 5, bracing frame 6, pulley 7 and foil gauge 8.Taken over 1 inwall symmetry and posted foil gauge 8; Four arc steel plate 2 equal altitudes, be close to and taken over 1 periphery equably, between adjacent arc steel plate 2, be provided with equidistant gap; The periphery welding loading blocks 3 of arc steel plate 2, loading blocks, for being transformed into the acting force to arc steel plate by adding loads, is applied a series of known pressure thereby realize to taking over outside surface; Each loading blocks 3 is provided with the groove of four axles concentricity with it, is provided with the gap corresponding with arc steel plate 2 interstitial sites between loading blocks 3; Four wire rope 4 pass respectively the groove of loading blocks; Every wire rope 4, respectively through after a pair of pulley 7, connects and adds loads 5 at its end; Every pair of pulley 7 symmetries are connected to the top of bracing frame 6.Described bracing frame 6 is four; Described foil gauge 8 is two, and they are along being taken over 1 inwall equal altitudes, arranging equably; Described foil gauge 8 connects dynamic strain measuring instrument 10 by wire 9.
As shown in Figure 6, the actual measurement of the fastening pressure the present invention relates to is achieved like this, and it comprises by adapter 1, tested marmem pipe joint 12, foil gauge 8, dynamic strain measuring instrument 10 and computing machine 11.By nozzle inner wall symmetry, posted foil gauge 8, the method for attaching of foil gauge is identical with the method for attaching in caliberating device; Dynamic strain measuring instrument 10 connects computing machine 11.
1) by design processing and manufacturing as shown in Figure 1, Figure 2, Figure 3 and Figure 4, go out fastening pressure caliberating device, and assemble;
2) will be placed in caliberating device by adapter, be pasted two foil gauges by nozzle inner wall is symmetrical, foil gauge be connected with dynamic strain measuring instrument (seeing accompanying drawing 5);
3) four wire rope are passed after the groove and fixed block of loading blocks respectively, at its end, add loads (seeing accompanying drawing 1), the weight that adds loads by change realizes being applied different pressure p i by adapter outer wall;
4) utilize the test of dynamic strain measuring instrument to stick on by the strain stress that foil gauge produced of nozzle inner wall under different pressures effect i;
5) by (p i～ε i) test data draws the demarcation relation curve (seeing accompanying drawing 6) of being taken between outer wall pressure p and inwall strain stress, and curve is carried out to matching, obtain by the functional relation p=f (ε) between adapter outer wall pressure p and inwall strain stress;
6) marmem pipe joint is enclosed within and is taken over by engineering matching requirements, by two foil gauges of the symmetrical stickup of nozzle inner wall, foil gauge is connected with dynamic strain measuring instrument, dynamic strain measuring instrument is connected with computing machine (seeing accompanying drawing 7), strain gauge adhesion mode and all identical with accompanying drawing 5 with dynamic strain measuring instrument connected mode;
7) marmem pipe joint pipeline connecting parts is put into heated oven and heat up, in temperature-rise period, by dynamic strain measuring instrument real-time testing, go out the strain stress being produced by nozzle inner wall foil gauge cand be transferred to computing machine, by computing machine according to p=f (ε) funtcional relationship calculate and demonstrate marmem pipe joint in heating rejuvenation to being taken over the fastening pressure being produced.
Key of the present invention is to set up the demarcation relation of being taken between outer wall pressure p and inwall strain stress, and its technical scheme adopting is: will be placed in pressure applying means, as shown in Figure 1, Figure 2 and Figure 4 by adapter; Pasted two foil gauges by nozzle inner wall is symmetrical, the foil gauge (see figure 5) that is connected with dynamic strain measuring instrument; Four wire rope, respectively through after the groove and fixed block of loading blocks, add loads at its end, and the weight that adds loads by change realizes being applied different pressure p i by adapter outer wall; Utilize the test of dynamic strain measuring instrument to stick on by the strain stress that foil gauge produced of nozzle inner wall under different pressures effect ithereby, obtain the demarcation relation curve (seeing accompanying drawing 6) of being taken between outer wall pressure p and inwall strain stress.Utilize this demarcation relation, can test out easily marmem pipe joint in heating rejuvenation to being taken over the fastening pressure (see figure 7) produced.

Claims (6)

1.一种形状记忆合金管接头紧固压力测试装置及其测试方法，它包括紧固压力标定装置和紧固压力实测装置。紧固压力标定装置包括应变片、被接管、弧形钢片、加载块、钢丝绳、滑轮、支撑架、加载重物、动态应变测试仪和计算机，其特征在于，被接管内壁对称贴有应变片；四个弧形钢片等高度、均匀地紧贴被接管外表面，相邻弧形钢片之间设有等距离间隙；弧形钢片与加载块通过焊接相连接，弧形钢片用于将加载块传递过来的力均匀地作用在被接管外表面上，并且控制被接管外表面所受压力的位置及其作用面积；加载块用于将加载重物转变成对弧形钢片的作用力，从而实现对被接管外表面施加一系列的已知压力；每个加载块上设有四个与其同中心轴的凹槽，加载块之间设有与弧形钢片间隙位置相对应的间隙；四根钢丝绳分别穿过加载块的凹槽，每根钢丝绳分别穿过一对滑轮后，在其末端连接加载重物，其中每对滑轮对称连接在支撑架的顶部。紧固压力实测装置包括被接管、被测形状记忆合金管接头、应变片、动态应变测试仪和计算机，其特征在于，被接管内壁对称贴有应变片，应变片的粘贴方法与标定装置中的粘贴方法完全相同。1. A shape memory alloy pipe joint fastening pressure testing device and testing method thereof, which comprises a fastening pressure calibration device and a fastening pressure actual measuring device. The fastening pressure calibration device includes strain gauges, connected pipes, arc-shaped steel sheets, loading blocks, steel wire ropes, pulleys, support frames, loading weights, dynamic strain testers and computers, and is characterized in that strain gauges are symmetrically pasted on the inner wall of the connected pipes ; The four arc-shaped steel sheets are equal in height and evenly close to the outer surface of the pipe to be connected, and there are equidistant gaps between adjacent arc-shaped steel sheets; the arc-shaped steel sheets and the loading block are connected by welding, and the arc-shaped steel sheets are used The force transmitted from the loading block acts uniformly on the outer surface of the connected pipe, and controls the position and area of pressure on the outer surface of the connected pipe; the loading block is used to convert the loaded weight into a curved steel sheet Force, so as to realize a series of known pressure on the outer surface of the connected pipe; each loading block is provided with four grooves concentric with its axis, and there are gaps between the loading blocks corresponding to the position of the arc-shaped steel sheet gap The gap; four steel wire ropes pass through the grooves of the loading block respectively, and each steel wire rope passes through a pair of pulleys respectively, and then connects the load at its end, wherein each pair of pulleys is symmetrically connected to the top of the support frame. The fastening pressure measuring device includes a connected pipe, a measured shape memory alloy pipe joint, a strain gauge, a dynamic strain tester and a computer. It is characterized in that the inner wall of the connected pipe is symmetrically pasted with strain gauges. The pasting method is exactly the same. 2.如权利要求1所述的一种形状记忆合金管接头紧固压力的标定装置，其特征在于，所述的加载块和支撑架均为四个，且每个加载块上均有四个凹槽。2. A calibration device for the fastening pressure of a shape memory alloy pipe joint as claimed in claim 1, wherein there are four loading blocks and support frames, and each loading block has four groove. 3.如权利要求1所述的一种形状记忆合金管接头紧固压力的标定装置，其特征在于，所述的应变片为两个，它们沿着被接管内壁圆周对均排布。3 . The device for calibrating fastening pressure of shape memory alloy pipe joints according to claim 1 , wherein there are two strain gauges, which are evenly arranged along the circumference of the inner wall of the connected pipe. 4 . 4.如权利要求1或3所述的一种形状记忆合金管接头紧固压力的测试装置（包括标定装置和实测装置），其特征在于，所述的应变片通过导线连接动态应变测试仪，动态应变测试仪连接计算机。4. A test device (including a calibration device and an actual measurement device) for the fastening pressure of a shape memory alloy pipe joint according to claim 1 or 3, characterized in that the strain gauge is connected to a dynamic strain tester through a wire, The dynamic strain tester is connected to the computer. 5.如权利要求1所述的一种形状记忆合金管接头紧固压力的标定装置，其特征在于，加载块用于将加载重物转变成对弧形钢片的作用力，而弧形钢片用于将加载块传递过来的力均匀地作用在被接管外表面上。5. A device for calibrating the fastening pressure of a shape memory alloy pipe joint as claimed in claim 1, wherein the loading block is used to convert the loaded weight into a force on the arc-shaped steel sheet, and the arc-shaped steel sheet The sheet is used to evenly act on the outer surface of the pipe from the force transmitted from the loading block. 6.如权利要求1所述的形状记忆合金管接头紧固压力测试装置的测试方法，其特征在于，所述的测试方法包括以下步骤：6. The test method of the shape memory alloy pipe joint fastening pressure test device as claimed in claim 1, wherein the test method comprises the following steps: (1)被接管外壁压力p与内壁应变ε之间标定关系的建立(1) The establishment of the calibration relationship between the external wall pressure p and the internal wall strain ε of the connected pipe a)按照权利要求1所述结构组装好标定装置；a) Assemble the calibration device according to the structure described in claim 1; b)利用标定装置对被接管施加一系列已知压力pi；b) Use the calibration device to apply a series of known pressure pi to the connected pipe; c)测试在不同压力作用下被接管内壁的对应应变εi；c) Test the corresponding strain ε i of the inner wall of the connected pipe under different pressures; d)绘制被接管外壁压力p与内壁应变ε之间的标定关系曲线；d) Draw the calibration relationship curve between the external wall pressure p and the internal wall strain ε of the connected pipe; e)对曲线进行拟合，建立被接管外壁压力p与内壁应变ε之间的函数关系式p＝f(ε)；e) Fit the curve, and establish the functional relationship p=f(ε) between the outer wall pressure p and the inner wall strain ε of the connected pipe; (2)形状记忆合金管接头紧固压力的测试(2) Tightening pressure test of shape memory alloy pipe joints a)将形状记忆合金管接头按工程装配要求套在被接管上；a) Put the shape memory alloy pipe joint on the pipe to be connected according to the engineering assembly requirements; b）按照权利要求1所述结构组装好实测装置；b) Assembling the actual measurement device according to the structure described in claim 1; c)将形状记忆合金管接头管路连接件放入加热烘箱中升温；c) putting the shape memory alloy pipe joint pipeline connection piece into a heating oven to raise the temperature; d)测试升温过程中被接管内壁应变εc，并传输给计算机；d) Test the strain ε c of the inner wall of the tube during the heating process, and transmit it to the computer; e)根据εc，由计算机利用p＝f(ε)的函数关系计算并显示出形状记忆合金管接头在升温恢复过程中产生的紧固压力。e) According to ε c , the computer uses the functional relationship of p=f(ε) to calculate and display the fastening pressure generated by the shape memory alloy pipe joint during the temperature recovery process.
CN201310733618.4A 2013-12-27 2013-12-27 A kind of marmem pipe joint fastening pressure test device and method of testing thereof Expired - Fee Related CN103698073B (en)

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CN105067251A (en) * 2015-08-19 2015-11-18 中国航空工业集团公司西安飞机设计研究所 Low-temperature failure detector for titanium-nickel-iron memory alloy joint
CN105628268A (en) * 2015-12-22 2016-06-01 福建联迪商用设备有限公司 System and method of testing POS equipment safety contact pressure
CN110426146A (en) * 2019-07-16 2019-11-08 西安建筑科技大学 A kind of heating device for marmem constraint restoring force test
CN110631816A (en) * 2019-10-08 2019-12-31 重庆凰圆汽车饰件有限公司 Be used for car bumper intensity check out test set
CN113375848A (en) * 2021-06-08 2021-09-10 哈尔滨工业大学 Soil pressure gauge based on shape memory polymer supports

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CN105067251A (en) * 2015-08-19 2015-11-18 中国航空工业集团公司西安飞机设计研究所 Low-temperature failure detector for titanium-nickel-iron memory alloy joint
CN105628268A (en) * 2015-12-22 2016-06-01 福建联迪商用设备有限公司 System and method of testing POS equipment safety contact pressure
CN105628268B (en) * 2015-12-22 2018-08-14 福建联迪商用设备有限公司 POS machine safety contact pressure testing system and test method
CN110426146A (en) * 2019-07-16 2019-11-08 西安建筑科技大学 A kind of heating device for marmem constraint restoring force test
CN110631816A (en) * 2019-10-08 2019-12-31 重庆凰圆汽车饰件有限公司 Be used for car bumper intensity check out test set
CN113375848A (en) * 2021-06-08 2021-09-10 哈尔滨工业大学 Soil pressure gauge based on shape memory polymer supports
CN113375848B (en) * 2021-06-08 2023-03-21 哈尔滨工业大学 Soil pressure gauge based on shape memory polymer supports

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