CN109507027B - Test sample, clamp and method for out-of-plane tensile strength of continuous fiber reinforced ceramic matrix composite - Google Patents
Test sample, clamp and method for out-of-plane tensile strength of continuous fiber reinforced ceramic matrix composite Download PDFInfo
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- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
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Abstract
The method for testing the out-of-plane tensile strength of the continuous fiber reinforced ceramic matrix composite can be suitable for high-temperature environments, and the out-of-plane tensile strength is tested under the condition that the ceramic matrix composite plate is only 4-10 mm in thickness. The cross-shaped test sample and the tool clamp with the cross groove are used for testing, so that a test experiment can be performed at room temperature to 2200 ℃; meanwhile, the downward moving ends of the test samples are guaranteed to bear the acting force of 1/2F respectively, the downward moving ends of the test samples can be stressed uniformly, and therefore the layered areas are torn uniformly. Therefore, the invention solves the problems that the out-of-plane tensile strength of the continuous fiber reinforced ceramic matrix composite material is difficult to measure in a high-temperature environment and the test sample cannot be uniformly torn when being damaged.
Description
Technical Field
The invention belongs to the field of continuous fiber reinforced ceramic matrix composite materials, and particularly relates to a method for testing out-of-plane tensile strength of a continuous fiber reinforced ceramic matrix composite material.
Background
The continuous fiber reinforced ceramic matrix composite has the advantages of high strength ratio, high modulus ratio, corrosion resistance, oxidation resistance and the like, so that the continuous fiber reinforced ceramic matrix composite becomes a necessary material for a new generation of aeroengine. In order to ensure that the test is close to the complex use environment of a real aero-engine, the test needs to be carried out in an atmospheric environment, a vacuum environment, an inert atmosphere environment and other corrosive environments as well as a room-temperature and high-temperature environment.
The structure determines the properties, since continuous fiber reinforced ceramic matrix composites are designed as flat panel structures, their in-plane properties are often an order of magnitude higher than their out-of-plane properties, which are therefore weak links in the overall structure. In a real use environment, the structural member is not only subjected to complex load action, but also is accompanied with coupling action such as oxidation, fatigue, creep, thermodynamics and the like, so that the concern about the weak link of the structural member is extremely important. In actual use, the thickness of the continuous fiber reinforced ceramic matrix composite is only about a few millimeters, so that the out-of-plane performance of the continuous fiber reinforced ceramic matrix composite is difficult to measure, and the difficulty is brought to a designer for carrying out structural optimization and analysis and calculation by a simulation engineer. The ASTM C1468-00 Test Standard (Test Method for Transthickness Tensile Strength of CFCCs at Ambient Temperature) in the United states measures the out-of-plane Tensile Strength of the CCC using the gluing Method, but the material/viscose debonding occurs and the out-of-plane Tensile Strength of the CCC cannot be accurately measured. In addition, at present, no high-temperature adhesive which can bear the high temperature of more than 1000 ℃ and maintain higher strength exists, so that the standard cannot be applied to a high-temperature environment. Therefore, it is a technical problem to determine the out-of-plane tensile strength of the continuous fiber reinforced ceramic matrix composite in a high temperature environment.
Disclosure of Invention
The technical problem to be solved is as follows: the invention discloses a method for testing out-of-plane tensile strength of a continuous fiber reinforced ceramic matrix composite, which solves the problems that the out-of-plane tensile strength of the continuous fiber reinforced ceramic matrix composite is difficult to measure in a high-temperature environment and a test sample cannot be uniformly torn when damaged.
The technical scheme of the invention is as follows: a test sample for out-of-plane tensile strength of a continuous fiber reinforced ceramic matrix composite is characterized in that: the sample is of a plate-shaped structure, is 4-10 mm thick and is divided into an X plate and a Y plate; the X plate and the Y plate are mutually perpendicular and the centers of the X plate and the Y plate are intersected, and are in a cross structure; the central intersection part of the sample is of a cubic structure with the width of 3-10 mm; the cube structure is provided with first mutually parallel notches at the outer sides of two opposite edges of the upper surface of the sample X plate, and the first notches are parallel to the Y plate; the cube structure is provided with second parallel notches on the outer sides of two opposite edges of the lower surface of the sample Y plate, and the second notches are parallel to the X plate; the width of each first notch is the same as that of each second notch, the width of each first notch is 0.1-1 mm, the length of each first notch is equal to that of the cubic structure, the depth of each first notch is equal to half of the thickness of a sample, and the bottom surfaces of the first notches and the second notches are on the same plane; and a layering area parallel to the upper surface and the lower surface of the sample is formed at the central intersection part of the X plate and the Y plate of the sample, the layering area is a square which is positioned on the same plane with the bottom surfaces of the first notch and the second notch, and the width of the layering area is 3-10 mm as that of the cubic structure.
The utility model provides a test fixture for out-of-plane tensile strength of continuous fiber reinforced ceramic matrix composite, which is characterized in that: the tool clamp comprises an upper clamp and a lower clamp; the lower clamp is of a block structure, and a cross groove corresponding to the sample is arranged on the upper surface of the lower clamp; the test sample is in clearance fit with the cross-shaped groove and can move in the cross-shaped groove along a direction vertical to the bottom surface of the cross-shaped groove; the cross groove is divided into a groove a 'b' and a groove e, the depth of the groove a 'b' is larger than the thickness of the sample and used for positioning the sample, and the depth of the groove e is larger than the depth of the groove a 'b'; when the part of the test piece, which is arranged in the groove e, is deformed under pressure, the test piece can continuously move towards the bottom of the groove e; the depth difference between the groove e and the groove a 'b' is larger than the thickness of the test piece, and a space can be provided for fracture of the delamination area of the test piece;
the upper clamp is of a plate-shaped structure, the width of the bottom surface of the upper clamp is equal to that of the X plate or the Y plate of the sample, the length of the bottom surface of the upper clamp is greater than that of the X plate or the Y plate of the sample, the upper clamp is in clearance fit with the groove e and can move in the direction perpendicular to the bottom surface of the cross groove; the bottom surface of the upper clamp is provided with a groove c'd' matched with the X plate or the Y plate of the sample, and the groove c'd' is used for positioning the part of the sample placed in the groove e; a groove f is formed in the middle of the bottom surface of the groove c'd', the depth of the groove f is larger than the thickness of the test sample, and a space can be provided for fracture of a layering area of the test sample; the upper surface of the upper clamp is of a convex arc structure, so that the load applied to the upper clamp by a mechanical testing machine can be uniformly applied to the downward moving end of the sample;
a method for testing out-of-plane tensile strength of a continuous fiber reinforced ceramic matrix composite is characterized by comprising the following specific steps:
the method comprises the following steps: accurately processing the out-of-plane tensile strength sample of the continuous fiber reinforced ceramic matrix composite;
step two: designing and processing the tool clamp matched with the test sample;
step three: installing the test sample into the tool clamp;
installing the Y plate with the downward sample cut in the groove a 'b' of the lower clamp, and installing the X plate with the upward sample cut in the groove e of the lower clamp; the bottom surface of the upper clamp faces the lower clamp, and a groove c'd' of the upper clamp is matched with an X plate of the sample and is arranged in a groove e of the lower clamp;
step four: placing the mounted sample and the tool clamp on a mechanical property testing machine, and setting testing parameters;
step five: applying an out-of-plane tensile monotonic load to an upper clamp of the tool clamp, namely, the convex arc acting force on the upper clamp is F, so that the downward moving ends c and d of the X plate of the sample bear the acting force of 1/2F respectively, and the downward moving ends of the sample can be stressed uniformly; applying an out-of-plane tensile monotonic load to the test sample until a delamination region of the test sample is destroyed, namely the test sample is uniformly torn; simultaneously recording a load-displacement curve;
step six: stopping the test, and taking out the sample;
step seven: according to the formula
The out-of-plane tensile strength is calculated,
wherein σ is the out-of-plane tensile strength, FmaxB is the width of the sample layering region for maximum failure load;
three replicates were run and the average of the three out-of-plane tensile strengths was taken.
The further technical scheme of the invention is as follows: the test temperature range of the test method is from room temperature to 2200 ℃.
The further technical scheme of the invention is as follows: the test environment of the test method is an atmospheric environment, a vacuum environment, an inert atmosphere environment or other corrosive environments.
Advantageous effects
The invention has the beneficial effects that: the invention provides a method for testing out-of-plane tensile strength of a continuous fiber reinforced ceramic matrix composite, which can be applied to a high-temperature environment and is used for testing out-of-plane tensile strength under the condition that a ceramic matrix composite plate is only 4-10 mm in thickness. The cross-shaped test sample and the tool clamp with the cross groove are used for testing, so that a test experiment can be performed at room temperature to 2200 ℃; meanwhile, the downward moving ends c and d of the sample are guaranteed to bear the acting force of 1/2F respectively, the downward moving ends of the sample can be stressed uniformly, and therefore the layered area is torn uniformly.
The sample is provided with notches on the opposite edges of the two sides of the intersection, so that the position of the delamination area can be determined, and uniform tearing can be ensured when the sample is damaged.
For the length of the side of the layering area is 3-10 mm, if the width is too small, the free edge effect is obvious, the out-of-plane tensile strength tested is small, and if the width is too large, the area of the layering area is large, so that the downward moving end and the fixed end of the sample are inevitably subjected to large loads, the sample foot is short, and the layering cannot be performed.
Drawings
FIG. 1 is a schematic view of a test specimen;
FIG. 2 is a three-dimensional view of a test specimen;
FIG. 3 is a schematic view of the lower clamp;
FIG. 4 is a schematic view of the upper clamp;
FIG. 5 shows a test specimen of a two-dimensional carbon fiber reinforced carbon-based composite material with a width of 4 mm;
FIG. 6 shows a test specimen of a two-dimensional carbon fiber reinforced carbon-based composite material with a width of 5 mm;
FIG. 7 shows a test specimen of a two-dimensional carbon fiber reinforced carbon-based composite material with a width of 6 mm;
FIG. 8 is a graph of a cross structure with a delamination area width of 4mm and a standard experimental load displacement in a room temperature environment;
FIG. 9 is a graph of a cross structure with a delamination area width of 5mm and a standard experimental load displacement in a room temperature environment;
FIG. 10 is a graph of a cross structure with a delamination area width of 6mm and a standard experimental load displacement in a room temperature environment;
FIG. 11 is a graph of tensile load versus displacement for an out-of-plane surface at 1200 ℃ in a vacuum environment;
figure 12 is a typical photograph of an out-of-plane tensile failure.
Detailed Description
The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.
The adopted material is a two-dimensional carbon fiber reinforced carbon-based composite material, which is provided by an ultrahigh-temperature structure composite material key laboratory of northwest industrial university, the thickness of the two-dimensional carbon fiber reinforced carbon-based composite material is generally several millimeters due to the limitation of a chemical vapor deposition (CVI), and a wide 4mm flat plate is selected and used for sample processing in the example.
The invention relates to a method for testing out-of-plane tensile strength of a continuous fiber reinforced ceramic matrix composite, wherein the testing temperature range is room temperature to 2200 ℃, and the testing environment is an atmospheric environment, a vacuum environment, an inert atmosphere environment or other corrosive environments. The method comprises the following specific steps:
the method comprises the following steps: accurately processing a continuous fiber reinforced ceramic matrix composite out-of-plane tensile strength sample;
referring to fig. 1 and 2, the sample is of a plate-shaped structure, has a thickness of 4-10 mm, and is divided into an X plate and a Y plate; the X plate and the Y plate are mutually perpendicular and the centers of the X plate and the Y plate are intersected, and are in a cross structure; the central intersection part of the sample is of a cubic structure with the width of 3-10 mm; the cube structure is provided with first mutually parallel notches at the outer sides of two opposite edges of the upper surface of the sample X plate, and the first notches are parallel to the Y plate; the cube structure is provided with second parallel notches on the outer sides of two opposite edges of the lower surface of the sample Y plate, and the second notches are parallel to the X plate; the width of each first notch is the same as that of each second notch, the width of each first notch is 0.1-1 mm, the length of each first notch is equal to that of the cubic structure, the depth of each first notch is equal to half of the thickness of a sample, and the bottom surfaces of the first notches and the second notches are on the same plane; the two ends of the X plate, which are positioned outside the two first notches, are respectively a c end and a d end, and the two ends of the Y plate, which are positioned outside the two second notches, are respectively an a end and a b end; forming a layering area parallel to the upper surface and the lower surface of the sample at the central intersection part of the X plate and the Y plate of the sample, wherein the layering area is a square which is positioned on the same plane with the bottom surfaces of the first notch and the second notch, and the side length of the layering area is 3-10 mm as the width of the cubic structure, as shown in the section line area of fig. 1 and fig. 2;
step two: designing and processing a tool clamp matched with the sample;
referring to fig. 3 and 4, the tool holder includes an upper holder and a lower holder; the lower clamp is of a cubic structure, and a cross groove corresponding to the sample is arranged on the upper surface of the lower clamp; the test sample is in clearance fit with the cross-shaped groove and can move in the cross-shaped groove along a direction vertical to the bottom surface of the cross-shaped groove; the cross groove is divided into a groove a 'b' and a groove e, the depth of the groove a 'b' is larger than the thickness of the sample and used for positioning the sample, and the depth of the groove e is larger than the depth of the groove a 'b'; when the part of the test piece, which is arranged in the groove e, is deformed under pressure, the test piece can continuously move towards the bottom of the groove e; the depth difference between the groove e and the groove a 'b' is larger than the thickness of the test piece, and a space can be provided for fracture of the delamination area of the test piece;
the upper clamp is of a plate-shaped structure, the width of the bottom surface of the upper clamp is equal to that of the X plate of the sample, the length of the bottom surface of the upper clamp is greater than that of the X plate of the sample, the upper clamp is in clearance fit with the groove e, and the upper clamp can move in the direction perpendicular to the bottom surface of the cross-shaped groove; the bottom surface of the upper clamp is provided with a groove c'd' matched with the X plate of the sample, and the groove c'd' is used for positioning the X plate of the sample; a groove f is formed in the middle of the bottom surface of the groove c'd', the depth of the groove f is larger than the thickness of the test sample, and a space can be provided for fracture of a layering area of the test sample; the upper surface of the upper clamp is of a convex arc structure, so that the load applied to the upper clamp by a mechanical testing machine can be uniformly applied to the downward moving end of the sample;
step three: installing the test sample into the tool clamp;
installing the Y plate with the downward sample cut in the groove a 'b' of the lower clamp, and installing the X plate with the upward sample cut in the groove e of the lower clamp; the bottom surface of the upper clamp faces the lower clamp, and a groove c'd of the upper clamp is matched with an X plate of the sample and is arranged in a groove e of the lower clamp;
step four: placing the mounted sample and the tool clamp on a mechanical property testing machine, and setting testing parameters;
step five: applying an out-of-plane tensile monotonic load to an upper clamp of the tool clamp, namely, the convex arc acting force on the upper clamp is F, so that the downward moving ends c and d of the X plate of the sample bear the acting force of 1/2F respectively, and the downward moving ends of the sample can be stressed uniformly; applying out-of-plane tensile monotonic load on the sample until the delamination area of the sample is destroyed, namely the sample is uniformly torn, and the shape of the torn sample is shown in figure 12; simultaneously recording a load-displacement curve;
and step six, stopping the test, and taking out the sample.
For the delamination area, if the width is too small, the free edge effect is obvious, the out-of-plane tensile strength tested is small, and if the width is too large, the delamination area is large, so that the downward moving end and the fixed end of the sample are inevitably subjected to large loads, the sample foot is short, and delamination cannot be realized. The layered region is designed as a square according to ASTM C1468-00 test standard, and the present invention still designs the layered region of the test specimen as a square. For the selection of the width of the square in the layering area, three sizes of 4mm, 5mm and 6mm are designed respectively, and the lengths of the samples are 16mm, 18mm and 20mm respectively. In order to verify the accuracy of the cross-shaped structure sample in determining the out-of-plane tensile strength of the continuous fiber reinforced ceramic matrix composite, a standard experiment with the same layered region width needs to be selected for comparison with the cross-shaped structure. The comparison results are shown in fig. 8, 9 and 10.
In a room temperature environment, the result of measuring the out-of-plane tensile strength of the continuous fiber reinforced ceramic matrix composite by using the cross structure provided by the invention needs to be compared with the result of measuring the ASTM C1468-00 standard test to find the optimal size of the cross structure in the room temperature environment, and then the out-of-plane tensile strength is measured in a high temperature environment, so that the measurement result can be real and effective. The displacement curves of the samples with three sizes of layered zone widths of 4mm, 5mm and 6mm under the room temperature environment and the standard experiment load are respectively shown in the figures 8, 9 and 10.
Referring to FIG. 8, for the standard test of a delamination area width of 4mm, the breaking load is 300.0N, the cross structure breaking load of the delamination area width of 4mm is 309.1N, 336.5N, 287.9N, respectively, the average value is 311.2N, considering that the ceramic matrix composite has a certain dispersion, and the test results of the standard test are distributed among the cross structure test results, so that the cross structure of the delamination area width of 4mm in the room temperature environment can replace the standard test.
Referring to FIG. 9, for the standard test of 5mm width of the delamination area, the breaking load is 483.3N, the breaking load of the cross structure of 5mm width of the delamination area is 519.0N, 450.2N, 520.1N, and the average value is 507.3N, considering that the ceramic matrix composite has a certain dispersion, and the test results of the standard test are distributed among the test results of the cross structure, so the cross structure of 5mm width of the delamination area under the room temperature environment can replace the standard test.
Referring to FIG. 10, for a standard test with a delamination area width of 6mm, the breaking load of 712.7N, the cross structure breaking load with a delamination area width of 6mm being 620.0N, 647.9N, 769.1N, respectively, and the average value of 679.0N, considering that the ceramic matrix composite has a certain dispersibility, and the test results of the standard test are distributed among the cross structure test results, so that the cross structure with a delamination area width of 6mm under a room temperature environment can replace the standard test.
As can be seen from the comparison results, the out-of-plane tensile failure loads measured by the cross structure and the standard test under the room temperature environment are similar, and the test results of the standard test are distributed among the test results of the cross structure, so that the high-temperature test can be carried out.
The high-temperature environment test equipment is an Instron-8801 type electrohydraulic servo fatigue tester matched vacuum high-temperature test system, the test temperature is 1200 ℃, and the test environment is vacuum (the vacuum degree is 10)-3Pa) is added. The loading rate was 0.5 mm/min. Fig. 11 shows a typical load-displacement curve.
Step seven: according to the formula
The out-of-plane tensile strength is calculated,
wherein σ is the out-of-plane tensile strength, FmaxB is the width of the sample layering region for maximum failure load;
this test was repeated 3 times, the out-of-plane tensile strengths tested were: 19.06MPa, 20.0MPa, 21.0MPa, so the average out-of-plane tensile strength of the material was found to be 19.83 MPa. The standard deviation is 0.58MPa, and the dispersion coefficient is 2.9%. Figure 12 shows a photograph after out-of-plane tensile failure. The test specimens exhibited a typical transverse tensile failure mode. The above results demonstrate that the test method is effective and highly accurate.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made in the above embodiments by those of ordinary skill in the art without departing from the principle and spirit of the present invention.
Claims (5)
1. A test sample for out-of-plane tensile strength of a continuous fiber reinforced ceramic matrix composite is characterized in that: the sample is of a plate-shaped structure, is 4-10 mm thick and is divided into an X plate and a Y plate; the X plate and the Y plate are mutually perpendicular and the centers of the X plate and the Y plate are intersected, and are in a cross structure; the central intersection part of the sample is of a cubic structure with the width of 3-10 mm; the cube structure is provided with first mutually parallel notches at the outer sides of two opposite edges of the upper surface of the sample X plate, and the first notches are parallel to the Y plate; the cube structure is provided with second parallel notches on the outer sides of two opposite edges of the lower surface of the sample Y plate, and the second notches are parallel to the X plate; the width of each first notch is the same as that of each second notch, the width of each first notch is 0.1-1 mm, the length of each first notch is equal to that of the cubic structure, the depth of each first notch is equal to half of the thickness of a sample, and the bottom surfaces of the first notches and the second notches are on the same plane; and a layering area parallel to the upper surface and the lower surface of the sample is formed at the central intersection part of the X plate and the Y plate of the sample, the layering area is a square which is positioned on the same plane with the bottom surfaces of the first notch and the second notch, and the width of the layering area is 3-10 mm as that of the cubic structure.
2. A tooling fixture for testing the test specimen of claim 1, characterized in that: the tool clamp comprises an upper clamp and a lower clamp; the lower clamp is of a block structure, and a cross groove corresponding to the sample is arranged on the upper surface of the lower clamp; the test sample is in clearance fit with the cross-shaped groove and can move in the cross-shaped groove along a direction vertical to the bottom surface of the cross-shaped groove; the cross groove is divided into a groove a 'b' and a groove e, the depth of the groove a 'b' is larger than the thickness of the sample and used for positioning the sample, and the depth of the groove e is larger than the depth of the groove a 'b'; when the part of the sample, which is arranged in the groove e, is deformed under pressure, the sample can continuously move towards the bottom of the groove e; the depth difference between the groove e and the groove a 'b' is larger than the thickness of the test sample, and a space can be provided for fracture of the delamination area of the test sample;
the upper clamp is of a plate-shaped structure, the width of the bottom surface of the upper clamp is equal to that of the X plate or the Y plate of the sample, the length of the bottom surface of the upper clamp is greater than that of the X plate or the Y plate of the sample, the upper clamp is in clearance fit with the groove e and can move in the direction perpendicular to the bottom surface of the cross groove; the bottom surface of the upper clamp is provided with a groove c'd' matched with the X plate or the Y plate of the sample, and the groove c'd' is used for positioning the part of the sample placed in the groove e; a groove f is formed in the middle of the bottom surface of the groove c'd', the depth of the groove f is larger than the thickness of the test sample, and a space can be provided for fracture of a layering area of the test sample; the upper surface of the upper clamp is of a convex arc structure, so that the load applied to the upper clamp by a mechanical testing machine can be uniformly applied to the downward moving end of the sample.
3. A method for testing out-of-plane tensile strength of a continuous fiber reinforced ceramic matrix composite by using the test sample of claim 1 and the tool clamp of claim 2 is characterized by comprising the following specific steps:
the method comprises the following steps: accurately processing the out-of-plane tensile strength sample of the continuous fiber reinforced ceramic matrix composite;
step two: designing and processing the tool clamp matched with the test sample;
step three: installing the test sample into the tool clamp;
installing the Y plate with the downward sample cut in the groove a 'b' of the lower clamp, and installing the X plate with the upward sample cut in the groove e of the lower clamp; the bottom surface of the upper clamp faces the lower clamp, and a groove c'd' of the upper clamp is matched with an X plate of the sample and is arranged in a groove e of the lower clamp;
step four: placing the mounted sample and the tool clamp on a mechanical property testing machine, and setting testing parameters;
step five: applying an out-of-plane tensile monotonic load to an upper clamp of the tool clamp, namely, the convex arc acting force on the upper clamp is F, so that the downward moving ends c and d of the X plate of the sample bear the acting force of 1/2F respectively, and the downward moving ends of the sample can be stressed uniformly; applying an out-of-plane tensile monotonic load to the test sample until a delamination region of the test sample is destroyed, namely the test sample is uniformly torn; simultaneously recording a load-displacement curve;
step six: stopping the test, and taking out the sample;
step seven: according to the formula
The out-of-plane tensile strength is calculated,
wherein σ is the out-of-plane tensile strength, FmaxB is the width of the sample layering region for maximum failure load;
three replicates were run and the average of the three out-of-plane tensile strengths was taken.
4. The method for testing out-of-plane tensile strength of a continuous fiber reinforced ceramic matrix composite according to claim 3, wherein: the test temperature range of the test method is from room temperature to 2200 ℃.
5. The method for testing out-of-plane tensile strength of a continuous fiber reinforced ceramic matrix composite according to claim 3, wherein: the test environment of the test method is an atmospheric environment, a vacuum environment, an inert atmosphere environment or other corrosive environments.
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| CN201811365625.2A CN109507027B (en) | 2018-11-16 | 2018-11-16 | Test sample, clamp and method for out-of-plane tensile strength of continuous fiber reinforced ceramic matrix composite |
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| CN201811365625.2A CN109507027B (en) | 2018-11-16 | 2018-11-16 | Test sample, clamp and method for out-of-plane tensile strength of continuous fiber reinforced ceramic matrix composite |
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| CN109507027A CN109507027A (en) | 2019-03-22 |
| CN109507027B true CN109507027B (en) | 2021-03-23 |
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