CN114485538A - Method for improving strain measurement accuracy of PBX structural member - Google Patents
Method for improving strain measurement accuracy of PBX structural member Download PDFInfo
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- CN114485538A CN114485538A CN202111519132.1A CN202111519132A CN114485538A CN 114485538 A CN114485538 A CN 114485538A CN 202111519132 A CN202111519132 A CN 202111519132A CN 114485538 A CN114485538 A CN 114485538A
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- pbx
- structural member
- strain gauge
- strain
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/32—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring the deformation in a solid
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- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention discloses a method for improving the accuracy of strain measurement of a PBX structural part, which comprises the following steps: (1) surface pretreatment is carried out on the pasting area of the strainometer of the PBX structural part; (2) after the PBX structural part strain gauge is pasted, high-temperature and low-temperature circulating curing is carried out; (3) and indirectly representing the sticking quality of the strain gauge of the PBX structural part. The invention can reduce the maximum value of the test data dispersibility of the multi-point strain gauge of the PBX structural member from more than +/-100 mu epsilon to less than +/-25 mu epsilon.
Description
Technical Field
The invention relates to the technical field of environmental tests, in particular to a method for improving strain measurement accuracy of a PBX structural member.
Background
The strain data of different parts of the structural part in the environmental test process are the most important measurement data. Because the strain gauges are adhered to the structural part through adhesives, the adhesion quality of the strain gauges at each point directly influences the accuracy of strain measurement data. Although the strain gauge pasting method in the metal and polymer material environment test is mature, due to the particularity of PBX material and after processing and forming, more residual micro dust and damaged micro particles exist in the machined grain groove, but the surface pretreatment can not be carried out by adopting the general mechanical grinding (such as sand paper grinding), solvent cleaning and other methods; meanwhile, the PBX also has the characteristic of low modulus (the modulus is generally less than 15GPa), when the strain gauges are pasted by finger pressure, the pasting force of each strain gauge is different due to different finger pressure, and a normal-temperature curing or high-temperature curing method is generally adopted after the strain gauges are pasted, but the normal-temperature curing or high-temperature curing method cannot obviously reduce the difference of the pasting force of each strain gauge of the PBX. If the PBX is not subjected to effective surface pretreatment and adhesive force homogenization, the dispersibility of the measured data of the multi-point strain gauge is larger, the dispersibility is often larger than +/-100 mu epsilon, and the requirement of the PBX structural member on the precision measurement of the environmental test strain is difficult to meet; in addition, because the strain gauge itself has a low tensile strength, the adhesion quality cannot be directly tested by the conventional tensile or peel test method. Therefore, it is necessary to develop a method suitable for surface pretreatment, adhesive force equalization, indirect characterization of adhesive quality and the like of the PBX for adhering the strain gauge according to the material characteristics of the PBX.
Disclosure of Invention
Aiming at the problems that the pasting quality is not high and the measured data dispersibility of the multi-point strain gauge is high when the universal strain gauge pasting method is applied to the PBX structural member, the invention provides the method for improving the strain measurement accuracy of the PBX structural member, which can reduce the measured data dispersibility and meet the strain accurate measurement requirement of the temperature environment test of the PBX structural member.
In order to achieve the technical effects, the invention provides the following technical scheme:
a method for improving the accuracy of strain measurement of a PBX structural member is characterized by comprising the following steps: (1) surface pretreatment is carried out on the pasting area of the PBX structural part strain gauge; (2) after the PBX structural part strain gauge is pasted, high-temperature and low-temperature circulating curing is carried out; (3) and indirectly representing the sticking quality of the strain gauge of the PBX structural part.
The further technical scheme is that the step (1) specifically comprises the steps of wiping off surface dust in the pasting area by using a cotton ball, then removing surface micro-damage particles in the pasting area by using pressure sensitive adhesive tape pasting, and further removing the surface dust.
Wherein the cotton ball wiping is used for removing the surface micro dust of the residual dust of the grain groove of the PBX machine;
wherein the pressure sensitive adhesive tape is adhered to remove surface micro-damage particles and further remove micro-dust;
then, the surface of the test piece is observed by a magnifying glass microscope without obviously damaging the particles, and pits left by the removed particles can be observed.
The further technical scheme is that the step (2) is specifically that after the strain gauge is pasted on the PBX structural member, the PBX structural member is parked at room temperature for at least 24 hours, and then high-low temperature cycle curing is carried out for 3 times, wherein the high-low temperature cycle conditions are as follows: 20 ℃ and → 40 ℃ and 0 ℃ and the temperature change rate is less than 0.5 ℃/min, and the constant temperature time of the 40 ℃ and 0 ℃ stages is not less than 4 hours.
The further technical scheme is that the step (3) is to indirectly represent the pasting quality by adopting the dispersibility of the test values of the strain gauges of a plurality of measuring points of the structural part 30min before the constant temperature stages of 40 ℃ and 0 ℃ in the 3 rd high-low temperature cycle.
Compared with the prior art, the method has the advantages that the method is suitable for surface pretreatment of PBX which can not be mechanically polished and cleaned by solvent, so that surface dust and surface microparticles in a bonding area of the strain gauge on the surface of the PBX are effectively removed, and the bonding quality of the strain gauge is remarkably improved; the nonuniformity of the sticking force of each strain gauge is effectively reduced by adopting a high-low temperature cycle test method, so that the dispersity of data of the multi-point strain gauge is remarkably reduced; the adhesive quality is indirectly represented by the maximum value of the dispersibility of the strain gauge test values of a plurality of measuring points of the structural member 30min before the constant temperature stages of 40 ℃ and 0 ℃ of the last high-low temperature cycle. The invention can reduce the maximum value of the test data dispersibility of the multi-point strain gauge of the PBX structural member from more than +/-100 mu epsilon to less than +/-25 mu epsilon.
Drawings
FIG. 1 is a schematic diagram of the internal structure and surface topography of a PBX surface before pretreatment;
FIG. 2 is a schematic diagram of the internal structure and surface topography of a PBX surface after pretreatment;
figure 3 is a surface micrograph of a PBX surface after pretreatment;
FIG. 4 is a schematic view of the application of a strain gage after surface preparation of a PBX;
FIG. 5 is a diagram of a multi-point strain bonded object of a PBX structure;
FIG. 6 is a diagram of a sample of a temperature cycle test after a PBX is attached with a strain gauge;
FIG. 7 is a multi-point strain test curve for a PBX structure prior to use of the method of the present invention;
figure 8 is a multi-point strain test curve for a PBX structural member after the method of the present invention is employed.
DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION
The invention is further described with reference to the following figures and specific examples.
Example 1
Surface pretreatment and high-low temperature circulating curing for sticking a TATB-based PBX structural part strain gauge. The TATB-based PBX is a typical PBX, and comprises TATB explosive particles and an adhesive, wherein the TATB explosive particles and the adhesive are prepared into molding powder by a granulation process, then the molding powder is pressed into a blank, and the blank is processed into a required structural part by a machining method.
The first step is as follows: removal of surface dust and surface damage particles in TATB-based PBX structural member pasting area
Fig. 1 is a schematic diagram of an internal structure and a surface morphology of a TATB-based PBX without surface pretreatment, wherein the internal structure mainly comprises TATB explosive particles and a binder, and after machining, a large amount of fine dust and fine particles are remained on the surface, particularly in a machined grain groove of the TATB-based PBX, so that the sticking quality of a strain gauge is affected.
Removing residual dust on the surface of a machine-processed line groove in a sticking area of a TATB-based PBX structural part strain gauge by adopting a cotton ball wiping mode;
then removing surface micro-damage particles in the sticking area of the TATB-based PBX structural part strain gauge by adopting a pressure-sensitive adhesive tape sticking and tearing-off mode, and further removing surface micro-dust;
and (3) observing the removal condition of the micro dust and micro particles on the surface of the sticking area of the TATB-based PBX structural strain meter by using a magnifier, wherein after repeated operation of the steps for many times, the sticking area of the TATB-based PBX structural strain meter has no obvious micro powder layer and no particles, and pits left after the micro particles are removed can be observed, as shown in fig. 2 and fig. 3.
The second step is that: high-low temperature circulating solidification after TATB-based PBX structural part strain gauge is pasted
And pasting the strain gauge on the TATB-based PBX structural member, wherein FIG. 4 is a detailed schematic view of a TATB-based PBX structure after surface pretreatment of the TATB-based PBX structure is pasted with the strain gauge, and FIG. 5 is a strain pasting object diagram of 12 measuring points of the TATB-based PBX structural member.
After the TATB-based PBX structural member is subjected to multipoint strain pasting, the TATB-based PBX structural member needs to be parked for a long enough time in a room temperature environment, wherein the parking time is more than 24 hours; then, the TATB-based PBX structural member to which the strain gauge is attached is placed in a temperature box to perform a high and low temperature cycle test, as shown in fig. 6, wherein the high and low temperature cycle conditions are 20 ℃→ 40 → 0 → 20 ℃, the temperature change rate is less than 0.5 ℃/min, the constant temperature time is required to be more than 4 hours in the 40 ℃ and 0 ℃ stages, and the cycle number is 3 times.
The third step: indirect representation of sticking quality of strain gauge of TATB-based PBX structural part
Fig. 7 and 8 are comparison graphs of strain test curves of 12 measuring points of the TATB-based PBX structural member before and after the method is adopted, and it can be seen that the coincidence of the strain test curves of 12 measuring points of the TATB-based PBX structural member after the method is adopted is obviously improved.
The test value dispersibility of the strain gauges with 12 measuring points 30min before the constant temperature stages of 40 ℃ and 0 ℃ in the 3 rd high-low temperature cycle is adopted to indirectly represent the pasting quality.
Tables 1 and 2 are respectively a dispersion data table for testing 12 measuring point strain of a TATB-based PBX structural member before and after the method is adopted, and the maximum dispersion value of the testing data of the 12 measuring point strain meters of the TATB-based PBX structural member is reduced from more than +/-100 mu epsilon to less than +/-25 mu epsilon from the data table.
TABLE 1 third cycle PBX structural member multipoint strain test data not employing the method of the present invention
TABLE 2 third cycle PBX structural member multipoint strain test data using the method of the present invention
Although the present invention has been described herein with reference to the illustrated embodiments thereof, which are intended to be preferred embodiments of the present invention, it is to be understood that the invention is not limited thereto, and that numerous other modifications and embodiments can be devised by those skilled in the art that will fall within the spirit and scope of the principles of this disclosure.
Claims (4)
1. A method for improving the accuracy of strain measurement of a PBX structural member is characterized by comprising the following steps: (1) surface pretreatment is carried out on the pasting area of the PBX structural part strain gauge; (2) after the PBX structural part strain gauge is pasted, high-temperature and low-temperature circulating curing is carried out; (3) and indirectly representing the sticking quality of the strain gauge of the PBX structural part.
2. The method of claim 1, wherein step (1) is performed by wiping the surface dust on the adhesive area with a cotton ball, removing the surface micro-damage particles on the adhesive area with pressure sensitive tape and further removing the surface dust.
3. The method for improving the accuracy of the strain measurement of the PBX structural member according to claim 1, wherein the step (2) is to stand the PBX structural member after the strain gauge is attached thereto at room temperature for at least 24 hours, and perform 3 times of high and low temperature cycle curing, wherein the high and low temperature cycle conditions are as follows: 20 ℃ and → 40 ℃ and 0 ℃ and the temperature change rate is less than 0.5 ℃/min, and the constant temperature time of the 40 ℃ and 0 ℃ stages is not less than 4 hours.
4. The method for improving the accuracy of the strain measurement of the PBX structural member according to claim 1, wherein the step (3) is to indirectly characterize the adhesion quality by using the dispersivity of the strain gauge test values of the structural member at a plurality of measuring points 30min before the end of the constant temperature stage of 40 ℃ and 0 ℃ in the 3 rd high and low temperature cycle.
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2021
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