CN112697882A - Method for detecting elastic modulus of cement-based fiber composite board - Google Patents
Method for detecting elastic modulus of cement-based fiber composite board Download PDFInfo
- Publication number
- CN112697882A CN112697882A CN202011454457.1A CN202011454457A CN112697882A CN 112697882 A CN112697882 A CN 112697882A CN 202011454457 A CN202011454457 A CN 202011454457A CN 112697882 A CN112697882 A CN 112697882A
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- Prior art keywords
- test piece
- elastic modulus
- cement
- fiber composite
- composite board
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- 238000000034 method Methods 0.000 title claims abstract description 47
- 239000004568 cement Substances 0.000 title claims abstract description 31
- 239000002131 composite material Substances 0.000 title claims abstract description 30
- 239000000835 fiber Substances 0.000 title claims abstract description 30
- 238000012360 testing method Methods 0.000 claims abstract description 65
- 238000001514 detection method Methods 0.000 claims abstract description 29
- 230000005284 excitation Effects 0.000 claims abstract description 23
- 239000011343 solid material Substances 0.000 claims description 5
- 239000000463 material Substances 0.000 description 5
- 238000011068 loading method Methods 0.000 description 3
- 230000003068 static effect Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000001066 destructive effect Effects 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005489 elastic deformation Effects 0.000 description 1
- 238000009774 resonance method Methods 0.000 description 1
- 238000001629 sign test Methods 0.000 description 1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/04—Analysing solids
- G01N29/045—Analysing solids by imparting shocks to the workpiece and detecting the vibrations or the acoustic waves caused by the shocks
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/04—Analysing solids
- G01N29/12—Analysing solids by measuring frequency or resonance of acoustic waves
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/01—Indexing codes associated with the measuring variable
- G01N2291/014—Resonance or resonant frequency
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/02—Indexing codes associated with the analysed material
- G01N2291/023—Solids
- G01N2291/0231—Composite or layered materials
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/02—Indexing codes associated with the analysed material
- G01N2291/028—Material parameters
- G01N2291/02827—Elastic parameters, strength or force
Abstract
The application relates to a method for detecting the elastic modulus of a cement-based fiber composite board, which comprises the following steps of S100: the detection test piece is a cement-based fiber composite board; step S200, test piece detection: placing a test piece on detection equipment, and detecting the test piece by the detection equipment through a pulse excitation method; step S300, obtaining the elastic modulus: and calculating the elastic modulus through a frequency value detected by a pulse excitation method. The application of the method is that the pulse excitation detection is nondestructive detection, the cement-based fiber composite board test piece is subjected to nondestructive detection through a pulse excitation method, the vibration frequency of feedback is utilized, the elastic modulus of the test piece is represented more accurately, and the performance of the test piece can be reflected more.
Description
Technical Field
The application relates to the field of cement material detection, in particular to a method for detecting the elastic modulus of a cement-based fiber composite board.
Background
The elastic modulus refers to the change in shape (called "deformation") of an elastic body when an external force is applied to the elastic body, and is an index reflecting the ability of the material to resist elastic deformation.
At present, three methods for measuring the elastic modulus of materials are available, namely a static method, a propagation method and a dynamic method. The static method is also called as a loading method, the test piece can be damaged in the test process, the test cannot be repeated, the test precision is low, the test is influenced by the stress loading speed, and the test result has large fluctuation; the transmission method, also known as the ultrasonic method, uses equipment with a complex and expensive structure and is limited in general application; the dynamic method, also called resonance method, uses a very small external force to make the test piece vibrate, and obtains the elastic modulus of the material by testing the fundamental frequency of the test piece, and the material is not damaged after the test, and the repeated test can be carried out.
The elastic modulus of the cement-based fiber composite board needs to be detected, and most of the cement-based fiber composite boards are tested by using a fracture resistance tester to perform destructive tests on a test piece at present, namely, static methods are used for testing the cement-based fiber composite board, so that the test piece is damaged due to the destructive tests, and on one hand, the same test piece cannot be tested in other projects, and is not beneficial to detection and analysis of different performances on the same test piece; on the other hand, the test of the same test piece in different time periods is not facilitated, the influence of the research time on the performance of the test piece is not facilitated, and the traceability of the numerical value is realized.
Disclosure of Invention
In order to solve the problem that the cement-based fiber composite board needs to be damaged when the elastic modulus of the cement-based fiber composite board is detected, the application provides a method for detecting the elastic modulus of the cement-based fiber composite board.
The application provides a cement-based fiber composite board elastic modulus detection method which adopts the following technical scheme:
a method for detecting the elastic modulus of a cement-based fiber composite board comprises the following detection steps:
step S100, preparing a test piece
The detection test piece is a cement-based fiber composite board;
step S200, test piece detection
Placing a test piece on detection equipment, and detecting the test piece by the detection equipment through a pulse excitation method;
step S300, obtaining the elastic modulus
And calculating the elastic modulus through a frequency value detected by a pulse excitation method.
Through adopting above-mentioned technical scheme, cement base fiber composite board, its inner structure constitutes more homogeneity, and the pulse excitation method detects to be nondestructive test, carries out nondestructive test to cement base fiber composite board test piece through the pulse excitation method, utilizes the vibration frequency of feedback, and the sign test piece elastic modulus that can be more accurate also can embody test piece performance more.
Optionally, the detection device is a solid material elasticity tester.
By adopting the technical scheme, the solid material elasticity performance tester is used for detecting the test piece by the pulse excitation method, so that the detection precision is improved.
Optionally, the length of the test piece is 210-250mm, the width is 50-54mm, and the thickness is 10-14 mm.
By adopting the technical scheme, the pulse excitation method is related to the length, the width and the thickness of the test piece, the length, the width and the thickness of the test piece can influence the quality of the test piece, and the elastic recovery degree can be influenced when the test piece deforms, so that the elastic modulus of the test piece is influenced.
In summary, the present application includes at least one of the following beneficial technical effects:
1. the pulse excitation detection is nondestructive detection, the cement-based fiber composite board test piece is subjected to nondestructive detection through a pulse excitation method, and the elastic modulus of the test piece can be detected more accurately by using the feedback vibration frequency, so that the performance of the test piece can be reflected better;
2. this application is relevant with length, width and the thickness of test piece through the pulse excitation method, and length, width and the thickness of test piece can influence the quality of test piece, when the test piece takes place deformation, can influence the degree of recovery of elasticity to influence the elastic modulus of test piece.
Drawings
Fig. 1 is an overall flow chart of the present application.
FIG. 2 is a graph of the elastic modulus measured by the pulse excitation method and the elastic modulus measured by the loading method.
Detailed Description
The present application is described in further detail below with reference to figures 1-2.
The embodiment of the application discloses a method for detecting the elastic modulus of a cement-based fiber composite board.
Referring to fig. 1, a method for detecting an elastic modulus of a cement-based fiber composite board includes the following steps:
step 100, preparing a test piece
Preparing a test piece to be detected, wherein the test piece is a cement-based fiber composite board;
step 200, test piece detection
Placing the cement-based fiber composite board on a solid material elasticity performance tester, and detecting the cement-based fiber composite board by the solid material elasticity performance tester through a pulse excitation method;
step 300, obtaining the elastic modulus
In the detection process, the cement-based fiber composite board is knocked to excite vibration, the vibration frequency is obtained through a vibration signal, and the elastic modulus is calculated by utilizing the vibration frequency detected by a pulse excitation method.
The length of the test piece is 210-250mm, the width is 50-54mm, and the thickness is 10-14 mm.
Different sized test pieces were compared as shown in table 1:
referring to fig. 2, the results of the pulse excitation method (modulus of elasticity) and the load method (modulus of elasticity) were compared for the same test piece, as shown in table 2, by fitting a curve (degree of fitting R)20.9627), it can be verified that the pulse excitation method can detect the elastic modulus of the cement-based fiber composite board.
The following formula is obtained from the fitted curve in fig. 2:
E＝﹣0.0279X2+2.617X-30.26，
the elastic modulus detected by the pulse excitation method can be converted into the elastic modulus of the load method through the formula.
TABLE 2
Other types of pulse excitation detection equipment can be used for detecting the cement-based fiber composite board by a pulse excitation method.
The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (3)
1. A method for detecting the elastic modulus of a cement-based fiber composite board comprises the following detection steps:
step S100, preparing a test piece
The detection test piece is a cement-based fiber composite board;
step S200, test piece detection
Placing a test piece on detection equipment, and detecting the test piece by the detection equipment through a pulse excitation method;
step S300, obtaining the elastic modulus
And calculating the elastic modulus through a frequency value detected by a pulse excitation method.
2. The method for detecting the elastic modulus of the cement-based fiber composite board as claimed in claim 1, wherein the method comprises the following steps: the detection equipment is a solid material elasticity performance tester.
3. The method for detecting the elastic modulus of the cement-based fiber composite board as claimed in claim 1, wherein the method comprises the following steps: the length of the test piece is 210-250mm, the width is 50-54mm, and the thickness is 10-14 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011454457.1A CN112697882A (en) | 2020-12-10 | 2020-12-10 | Method for detecting elastic modulus of cement-based fiber composite board |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011454457.1A CN112697882A (en) | 2020-12-10 | 2020-12-10 | Method for detecting elastic modulus of cement-based fiber composite board |
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| Publication Number | Publication Date |
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| CN112697882A true CN112697882A (en) | 2021-04-23 |
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| CN202011454457.1A Pending CN112697882A (en) | 2020-12-10 | 2020-12-10 | Method for detecting elastic modulus of cement-based fiber composite board |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6739194B1 (en) * | 2003-06-27 | 2004-05-25 | Weyerhaeueer Company | Method of determining physical properties of wood |
| CN201340367Y (en) * | 2009-01-13 | 2009-11-04 | 中国建筑材料科学研究总院 | Material elastic property tester |
| CN103364283A (en) * | 2013-07-16 | 2013-10-23 | 广州市香港科大霍英东研究院 | Method for rapidly detecting parameters of cement-based material |
| CN107525848A (en) * | 2016-06-20 | 2017-12-29 | 来安中衡物联网设备科技有限公司 | The detection method and equipment of the material parameter of cement-based material |
| CN109270169A (en) * | 2018-10-19 | 2019-01-25 | 中国工程物理研究院总体工程研究所 | A kind of fibre reinforced composites elastic parameter rapid assay methods and system |
| CN110133103A (en) * | 2019-05-29 | 2019-08-16 | 东北大学 | Fibre reinforced composites parameter identification method based on planar pulse sound wave exciting |
-
2020
- 2020-12-10 CN CN202011454457.1A patent/CN112697882A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6739194B1 (en) * | 2003-06-27 | 2004-05-25 | Weyerhaeueer Company | Method of determining physical properties of wood |
| CN201340367Y (en) * | 2009-01-13 | 2009-11-04 | 中国建筑材料科学研究总院 | Material elastic property tester |
| CN103364283A (en) * | 2013-07-16 | 2013-10-23 | 广州市香港科大霍英东研究院 | Method for rapidly detecting parameters of cement-based material |
| CN107525848A (en) * | 2016-06-20 | 2017-12-29 | 来安中衡物联网设备科技有限公司 | The detection method and equipment of the material parameter of cement-based material |
| CN109270169A (en) * | 2018-10-19 | 2019-01-25 | 中国工程物理研究院总体工程研究所 | A kind of fibre reinforced composites elastic parameter rapid assay methods and system |
| CN110133103A (en) * | 2019-05-29 | 2019-08-16 | 东北大学 | Fibre reinforced composites parameter identification method based on planar pulse sound wave exciting |
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Application publication date: 20210423 |
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