CN212932248U - Inorganic high performance fiber bundle radial shear performance testing device - Google Patents
Inorganic high performance fiber bundle radial shear performance testing device Download PDFInfo
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- CN212932248U CN212932248U CN202021144415.3U CN202021144415U CN212932248U CN 212932248 U CN212932248 U CN 212932248U CN 202021144415 U CN202021144415 U CN 202021144415U CN 212932248 U CN212932248 U CN 212932248U
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Abstract
The utility model belongs to the material test field relates to an inorganic high performance fiber bundle radial shear behavior testing arrangement. The utility model discloses a testing arrangement includes the device pole, down device pole, middle symmetrical splint, utilizes the lofting hole of device pole and the inseparable cooperation between the middle symmetrical splint lofting hole to collocation tensile test machine uses, has avoided the characteristics that inorganic high performance fiber bending nature is poor, resistant shearing nature is low, and has realized the effective test to the radial shear behavior of inorganic high performance fiber bundle. The utility model discloses a testing arrangement, stable in structure, easy operation, the application is nimble.
Description
Technical Field
The utility model belongs to the material test field relates to an inorganic high performance fiber bundle radial shear behavior testing arrangement.
Background
Inorganic high-performance fibers such as carbon fibers, glass fibers, special ceramic fibers and the like are widely applied to the fields of aerospace, national defense, traffic, communication and the like due to the excellent properties of high modulus, high strength, high temperature resistance, corrosion resistance and the like. Inorganic high-performance fibers are often severely damaged by friction, bending, shearing and other actions during the forming process. Therefore, the shear resistance of the inorganic high-performance fiber is a key performance index which affects the forming process and the quality of products.
However, at present, only a few studies on the aspect of the shear performance test of the high-performance fiber are performed in China, wherein a device for testing the shear performance of the aramid fiber is provided in the research on the cut resistance of the yarn along the cross section (pistil. research on the cut resistance of the yarn along the cross section [ D ]. Tianjin industry university, 2006). the device adopts a blade as a cutting tool, and meanwhile, a sample is greatly bent in the test process. On one hand, inorganic high-performance fibers can generate broken filaments in the process of bending with large curvature, and on the other hand, the blades are too sharp, so that the inorganic fibers can be quickly cut off along the radial direction, the shearing performance cannot be effectively tested, and the accuracy of an experimental result is influenced. Therefore, the device for testing the radial shearing performance of the inorganic high-performance fiber bundle is developed, the shearing performance of the inorganic high-performance fiber can be accurately obtained, and the device has important guiding values for the selection of simulation data of the composite material and the low-damage design of the production process.
SUMMERY OF THE UTILITY MODEL
The utility model aims at: a testing device suitable for the radial shearing performance of an inorganic high-performance fiber bundle is provided.
The utility model adopts the technical scheme that: radial shear behavior testing arrangement of tow, including last device pole, lower device pole, middle symmetrical splint, wherein:
the upper device rod comprises an upper device rod cylinder and an upper device rod cuboid, the upper device rod cylinder is positioned at the upper end of the upper device rod, the upper device rod cuboid is positioned at the lower end of the upper device rod, the central axes of the upper device rod cylinder and the upper device rod cuboid are collinear and are connected into a whole, a pin hole is formed in the upper device rod cylinder and is used for connecting one end of a tensile testing machine sensor, and a sample placing hole is formed in the central vertical axis of the upper device rod cuboid;
the lower device rod comprises a lower device rod cylinder and a lower device rod cuboid, the lower device rod cylinder is located at the lower end of the lower device rod, the lower device rod cuboid is located at the upper end of the lower device rod, the central axes of the lower device rod cylinder and the lower device rod cuboid are collinear and are connected into a whole, the lower device rod cylinder is provided with a pin hole for being connected and fixed at the lower end of the tensile testing machine, the thickness of the lower device rod cuboid is consistent with that of the lower device rod cuboid, the upper device rod cuboid is ensured to be tightly matched with the middle symmetrical clamping plate, and therefore the shearing effect is achieved;
the middle symmetrical clamping plates are composed of two identical flat plates, two sides of each middle symmetrical clamping plate sample placing hole are respectively provided with a middle symmetrical clamping plate sample placing hole, the size of each middle symmetrical clamping plate sample placing hole is identical to that of each upper device rod sample placing hole, and the middle symmetrical clamping plates and the lower device rod cuboids are fixed into a whole through bolts.
Further preferred, there is the fixed orifices bottom side of centre symmetry splint putting the appearance hole for fixed sample, after fixed sample, can make whole tow be partial to more and go up the survey, guaranteed that the fibre both sides receive the shearing action simultaneously, also avoided simultaneously in the experimentation fibre not receive just having great deformation when the shearing action, reduce the fibre and receive to buckle and influence the test of shearing property.
Further preferred, middle symmetry splint loft hole with the central axis before the use of last device pole loft hole, and the loft hole is circular, because the tow cross-section is similar circular in weaving and use, the loft hole still plays the effect of correcting experimental apparatus initial position, and on the other hand can make the fibre be the state of straightening before the test, thereby uses through the cooperation between control last device pole loft hole and the middle symmetry splint loft hole and reaches the shearing action to the fibre, has avoided buckling to experimental sample.
Further preferably, the diameters of the middle symmetrical clamping plate sample placing hole and the upper device rod sample placing hole are 3mm to 5mm, so that the loose state of the fiber bundle can be ensured under the state that the fiber bundle is not twisted, and the sample placing with a large number of fiber bundles can be met.
Further preferably, the length of the middle symmetrical clamping plate is 35mm, the middle symmetrical clamping plates are respectively fixed on two sides of the lower device rod cuboid end and are in contact with the lower device rod cuboid end for 20mm, the contact length of the middle symmetrical clamping plate and the upper device rod cuboid is smaller than 15mm, namely, the influence on the experiment caused by the friction force generated by the contact of the middle symmetrical clamping plate and the upper device rod in the experiment process is reduced, and meanwhile, the test of the shearing performance can be completed.
In summary, with the above technical solution contemplated by the present invention, the following beneficial effects can be obtained:
1. the utility model can test the shearing strength of various inorganic high-performance fiber bundles, and has the advantages of stable structure, simple operation and flexible application;
2. the utility model provides a can change shear rate, twist, the experimental condition of the number of plied yarns according to the condition of weaving and difference in the use and test.
Drawings
Fig. 1 is a perspective side view of the testing device of the present invention.
Fig. 2 is a top view of the structure device of the present invention.
Fig. 3 is a horizontal cross-sectional view of the structural assembly of the present invention taken along 6 in fig. 1.
Fig. 4 is a schematic view of the upper device rod of the construction device according to the invention.
In the figure: 1-upper device rod, 2-upper device rod cylinder, 3-upper device rod pin hole, 4-upper device rod cuboid, 5-middle symmetrical splint, 6-middle symmetrical splint lofting hole, 7-lower device rod cuboid, 8-lower device rod, 9-lower device rod pin hole, 10-lower device rod cylinder, 11-fixing hole, 12-upper device rod lofting hole.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
As shown in fig. 1, 2, 3, and 4, the test apparatus includes: go up device pole 1, lower device pole 8, central symmetry splint 5, wherein:
the upper device rod 1 comprises an upper device rod cylinder 2 and an upper device rod rectangular body 4, the upper device rod cylinder 2 is positioned at the upper end of the upper device rod 1, the upper device rod rectangular body 4 is positioned at the lower end of the upper device rod 1, the central axes of the upper device rod cylinder 2 and the upper device rod rectangular body 4 are collinear and are connected into a whole, a pin hole 3 is formed in the upper device rod cylinder 2 and is used for connecting one end of a tensile testing machine sensor, and a sample placing hole 12 is formed in the central vertical axis of the upper device rod rectangular body 4, so that the sample placing hole with the diameter of 3 mm-5 mm can not be in a loose state when the fiber bundles are not twisted, and can also meet the sample placing with a large number of fiber bundles;
the lower device rod 8 comprises a lower device rod cylinder 10 and a lower device rod rectangular body 7, the lower device rod cylinder 10 is positioned at the lower end of the lower device rod 8, the lower device rod rectangular body 7 is positioned at the upper end of the lower device rod 8, the lower device rod cylinder 10 and the central axis of the lower device rod rectangular body 7 are collinear and are connected into a whole, and the lower device rod cylinder is provided with a pin hole 9 for connecting and fixing at the lower end of the tensile testing machine;
the middle symmetrical clamping plates 5 are composed of two identical flat plates, the bottom sides of the middle symmetrical clamping plate sample placing holes 6 are respectively provided with a fixing hole 11, the size of the middle symmetrical clamping plate sample placing holes 6 is the same as that of the upper device rod cuboid sample placing holes 12, and the middle symmetrical clamping plates 5 are fixed on the two sides of the lower device rod cuboid 7 through bolts.
As shown in fig. 1, the upper device rod cuboid 4 and the lower device rod cuboid 7 are consistent in thickness, so that the upper device rod cuboid and the middle symmetrical clamping plates are tightly matched, and a shearing effect is achieved.
As shown in figure 2, the fiber fixing hole 11 is arranged on the bottom surface, after a sample is fixed, the whole fiber bundle is more deviated to the upper measurement, the two sides of the fiber are ensured to be simultaneously subjected to the shearing action, meanwhile, the fiber is prevented from being greatly deformed when not subjected to the shearing action in the experimental process, and the test that the shearing performance is influenced by bending of the fiber is reduced.
As shown in figure 3, the middle symmetrical clamping plate sample placing hole 6 and the upper device rod sample placing hole 12 are concentric with the central axis before use and are circular, the cross section of a fiber bundle is approximate to circular in weaving and using processes, the sample placing holes also play a role in correcting the initial position of an experimental device, on the other hand, the fibers can be in an unbent state before testing, the shearing effect on the fibers is achieved by controlling the matching use between the upper device rod sample placing hole 12 and the middle symmetrical clamping plate sample placing hole 6, and the influence on the shearing performance test caused by poor bending resistance of the inorganic high-performance fibers is effectively avoided.
As shown in fig. 1 and 4, the length of the middle symmetrical clamping plate 5 is 35mm, the length of the middle symmetrical clamping plate is respectively fixed on two sides of the lower device rod cuboid 7, the contact length of the middle symmetrical clamping plate 5 and the upper device rod cuboid 4 is smaller than 15mm, namely, the friction force generated by the contact of the middle symmetrical clamping plate 5 and the upper device rod cuboid 4 in the experimental process is reduced, so that the experiment is influenced, and meanwhile, the test of the shearing performance can be completed.
The present invention will be described in detail below by taking part of the inorganic fiber sample experiment as an example, and table 1 shows the specific fiber shear performance experimental parameters.
TABLE 1 Experimental parameters for fiber shear performance
Example 1:
step 1: preparing test experimental samples, preparing 5 test pieces in each group, and preparing the T300-3K carbon fiber to be tested into a length of 50mm, wherein the twist is 0 twist/cm.
Step 2: the testing device is installed, and the experimental apparatus is installed on tensile testing machine, and upper mounting rod cylinder 2 is fixed in the upper end that tensile testing machine has the sensor with round pin hole 3, and lower mounting rod cylinder 10 is fixed at the tensile testing machine lower extreme with round pin hole 9, and middle symmetrical splint 5 are fixed in lower mounting rod cuboid 7 both sides, and the middle symmetrical splint of correcting simultaneously is put appearance hole 6 and upper mounting rod cuboid and is put appearance hole 12 the central axis collineation.
And step 3: the experimental sample is put into the middle symmetrical splint sample placing hole 6, one end is fixed by the fixing hole 11, the other end is added with the weight to give certain pre-tension, then the other end of the fiber bundle is fixed, and the weight is removed.
And 4, step 4: the tensile testing machine was set to zero, the tensile speed was set to 4mm/s, and the stroke was set to 15 mm.
And 5: and starting the tensile testing machine, and recording the maximum stress of each group.
Step 6: the experimental data were processed to determine the mean of the five groups of 27.3N, and since both sides of the fiber were simultaneously sheared, the radial shear strength of the fiber bundle was half of the force measured, and the shear strength was 13.65N.
Example 2:
step 1: preparing test samples, preparing 5 test pieces in each group, and preparing the silicon nitride fibers to be tested into the length of 50mm, wherein the twist is 0 twist/cm.
Step 2: installation testing arrangement, experimental apparatus install on tensile testing machine, go up device pole cylinder 2 and fix in tensile testing machine has the upper end of sensor with round pin hole 3, and lower device pole cylinder 10 is fixed at the tensile testing machine lower extreme with round pin hole 9, and middle symmetrical splint 5 are fixed in 7 both sides of device pole cuboid down, corrects middle symmetrical splint simultaneously and puts the appearance hole 6 and put the appearance hole 12 the central axis collineation with last device pole cuboid.
And step 3: the experimental sample is placed in the middle symmetrical clamping plate sample placing hole 6, one end of the experimental sample is fixed by the fixing hole 11, the other end of the experimental sample is added with a weight to give a certain pre-tension, then the other end of the fiber bundle is fixed, and the weight is removed.
And 4, step 4: the tensile testing machine was set to zero, the tensile speed was set to 3mm/s, and the stroke was set to 15 mm.
And 5: and starting the tensile testing machine, and recording the maximum stress of each group.
Step 6: the experimental data were processed to determine the mean value of the five groups of 18.5N, since both sides of the fiber were simultaneously sheared, the radial shear strength of the fiber bundle was half of the force measured, and the shear strength was 9.25N.
Example 3:
step 1: test samples were prepared, 5 test pieces per group, and the quartz fiber to be tested was made to a length of 50mm with a twist of 10 twists/cm.
Step 2: the testing device is installed, and the experimental apparatus is installed on tensile testing machine, and upper mounting rod cylinder 2 is fixed in the upper end that tensile testing machine has the sensor with round pin hole 3, and lower mounting rod cylinder 10 is fixed at the tensile testing machine lower extreme with round pin hole 9, and middle symmetrical splint 5 are fixed in lower mounting rod cuboid 7 both sides, and the middle symmetrical splint of correcting simultaneously is put appearance hole 6 and upper mounting rod cuboid and is put appearance hole 12 the central axis collineation.
And step 3: the experimental sample is put into the middle symmetrical splint sample placing hole 6, one end is fixed by the fixing hole 11, the other end is added with the weight to give certain pre-tension, then the other end of the fiber bundle is fixed, and the weight is removed.
And 4, step 4: the tensile testing machine was set to zero, the tensile speed was set to 3mm/s, and the stroke was set to 15 mm.
And 5: and starting the tensile testing machine, and recording the maximum stress of each group.
Step 6: the experimental data were processed to determine the average of the five groups of 14.7N, and since both sides of the fiber were simultaneously sheared, the radial shear strength of the fiber bundle was half of the force measured, and the shear strength was 7.35N.
Example 4:
step 1: test samples were prepared, 5 test pieces per group, and the alumina fiber to be tested was made 50mm long with a twist of 75 twists/cm.
Step 2: installation testing arrangement, experimental apparatus install on tensile testing machine, go up device pole cylinder 2 and fix in tensile testing machine has the upper end of sensor with round pin hole 3, and lower device pole cylinder 10 is fixed at the tensile testing machine lower extreme with round pin hole 9, and middle symmetrical splint 5 are fixed in device pole cuboid 7 both sides down, corrects middle symmetrical splint simultaneously and puts the appearance hole 6 and put the appearance hole 12 the central axis collineation with last device pole cuboid.
And step 3: the experimental sample is put into the middle symmetrical splint sample placing hole 6, one end is fixed by the fixing hole 11, the other end is added with the weight to give certain pre-tension, then the other end of the fiber bundle is fixed, and the weight is removed.
And 4, step 4: the tensile testing machine was set to zero, the tensile speed was set to 4mm/s, and the stroke was set to 15 mm.
And 5: and starting the tensile testing machine, and recording the maximum stress of each group.
Step 6: the experimental data were processed to determine the average of the five groups as 28.5N, and since both sides of the fiber were simultaneously sheared, the radial shear strength of the fiber bundle was half of the force measured, and the shear strength was 14.25N.
The above examples are only preferred embodiments of the present invention, and are not intended to limit the present invention, and any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention should be included within the protection scope of the present invention.
Claims (3)
1. The utility model provides an inorganic high performance fiber bundle radial shear behavior testing arrangement which characterized in that, includes upper mounting rod (1), lower mounting rod (8), middle symmetrical splint (5), wherein:
the upper device rod (1) comprises an upper device rod cylinder (2) and an upper device rod cuboid (4), the upper device rod cylinder (2) is positioned at the upper end of the upper device rod (1), the upper device rod cuboid (4) is positioned at the lower end of the upper device rod (1), the central axes of the upper device rod cylinder (2) and the upper device rod cuboid (4) are collinear and are connected into a whole, a pin hole (3) is positioned on the upper device rod cylinder (2), and the central axis of the upper device rod cuboid (4) is provided with an upper device rod cuboid sample placing hole (12) with the diameter of 3mm to 5 mm;
the lower device rod (8) comprises a lower device rod cylinder (10) and a lower device rod cuboid (7), the lower device rod cylinder (10) is located at the lower end of the lower device rod (8), the lower device rod cuboid (7) is located at the upper end of the lower device rod (8) and is consistent with the upper device rod cuboid (4) in thickness, the central axes of the lower device rod cylinder (10) and the lower device rod cuboid (7) are collinear and are connected into a whole, and a pin hole (9) is located in the lower device rod cylinder (10);
middle symmetry splint (5) are formed by two the same flat boards, respectively have middle symmetry splint to put appearance hole (6) in both sides, and the bottom side that appearance hole (6) were put to middle symmetry splint respectively has a fixed orifices (11), and middle symmetry splint are put appearance hole (6) and are put appearance hole (12) size the same with last device pole cuboid, and middle symmetry splint (5) are fixed in device pole cuboid (7) both sides down with the bolt.
2. The device for testing the radial shearing performance of the inorganic high-performance fiber bundle as claimed in claim 1, wherein the middle symmetrical clamping plate sample placing holes (6) and the upper device rod cuboid sample placing holes (12) are both circular.
3. The inorganic high-performance fiber bundle radial shear performance testing device of claim 1, wherein the length of the middle symmetrical clamping plate (5) is 35mm, and the contact length of the middle symmetrical clamping plate (5) and the lower device rod cuboid (7) is 20 mm.
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| CN202021144415.3U CN212932248U (en) | 2020-06-16 | 2020-06-16 | Inorganic high performance fiber bundle radial shear performance testing device |
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