CN211235256U - Experimental device for brittle building material damage parameter - Google Patents
Experimental device for brittle building material damage parameter Download PDFInfo
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- CN211235256U CN211235256U CN201921450246.3U CN201921450246U CN211235256U CN 211235256 U CN211235256 U CN 211235256U CN 201921450246 U CN201921450246 U CN 201921450246U CN 211235256 U CN211235256 U CN 211235256U
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Abstract
The utility model relates to the technical field of brittle materials, in particular to an experimental device for brittle building material damage parameters, which comprises a test bed, an upper clamping device, a brittle building material test piece, a lower clamping device and a digital strain gauge; the upper clamping device and the lower clamping device are arranged on the test bed and driven to move along the vertical direction by a driving mechanism arranged on the test bed, and the upper clamping device and the lower clamping device are respectively tightly propped and clamped with two ends of the brittle building material test piece; and the brittle building material test piece is connected with the digital strain gauge for measuring and recording the strain generated by the loading of the brittle building material test piece. The utility model discloses work such as data acquisition, data integration, data calculation is accomplished through the experimental apparatus system one step in place, has both improved the accuracy of experimental result and has brought very big convenience for the experiment flow.
Description
Technical Field
The utility model relates to a brittle material technical field especially relates to an experimental apparatus of brittle building material damage parameter.
Background
Materials are those substances that are used by humans to make articles, devices, components, machines or other products. The material is a material basis on which human beings live and develop, and is closely related to national economic construction, national defense construction and people's life. From the viewpoint of use, materials can be classified into electronic materials, aerospace materials, nuclear materials, building materials, energy materials, biological materials, and the like. The utility model is mainly suitable for brittle building materials. The brittle materials in the building materials refer to bricks, tiles, stones, concrete, glass and the like, and have the characteristics of high compressive strength, difficult bearing of tensile force, no generation of plastic deformation after stress and brittle fracture when being damaged. Reinforced concrete structures are used more often in modern buildings. The reinforced concrete structure has both brittle material and tough material, and the tough material is also called plastic material, and has the characteristic of high tensile strength, but can generate plastic deformation after being stressed, such as: and (5) reinforcing steel bars. When in use, the characteristics of the brick, the stone and the concrete are exerted to the maximum extent, and the functions of the brick, the stone and the concrete, the reinforcing steel bar, such as tension, bending and shearing force, are exerted. The reinforced concrete combines the two materials together, utilizes respective characteristics and is widely applied in the field of buildings.
Based on the above consideration, the utility model designs an experimental apparatus of brittle building material damage parameter.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome prior art not enough, provide an experimental apparatus of fragility building material damage parameter to reach the purpose that can carry out the aassessment to the fragility building material damage, provide the parameter basis for building structure health monitoring and optimal design.
In order to realize the utility model discloses a purpose, the utility model discloses a technical scheme do:
the utility model discloses an experimental device for brittle building material damage parameters, which comprises a test bed, an upper clamping device, a brittle building material test piece, a lower clamping device and a digital strain gauge; the upper clamping device and the lower clamping device are arranged on the test bed and driven to move along the vertical direction by a driving mechanism arranged on the test bed, and the upper clamping device and the lower clamping device are respectively tightly propped and clamped with two ends of the brittle building material test piece; and the brittle building material test piece is connected with the digital strain gauge for measuring and recording the strain generated by the loading of the brittle building material test piece.
Further, the digital strain gauge is connected with a central processing unit which is used for processing the strain data of the brittle building material test piece recorded by the digital strain gauge and calculating the elongation of the test piece.
Further, the central processing unit is connected with a data display used for displaying the result obtained by the experiment.
The beneficial effects of the utility model reside in that:
1. the utility model completes the data collection, data integration, data calculation and other works in place by one step through the experimental device system, thereby not only improving the accuracy of the experimental result, but also bringing great convenience to the experimental process;
2. the utility model discloses a hooke's law formula and the combination of classical damage formula have given a damage measuring new method under the prerequisite of guaranteeing measurement accuracy, have made the contribution for structure health monitoring and optimal design.
Drawings
Fig. 1 is a schematic structural view of the present invention;
fig. 2 is the utility model discloses the structural schematic diagram of well fragility building material test piece.
In the figure, 1-a test bed, 2-an upper clamping device, 3-a brittle building material test piece, 4-a lower clamping device, 5-a digital strain gauge, 6-a central processing unit and 7-a data display.
Detailed Description
The invention will be further described with reference to the following figures and examples:
see fig. 1-2.
The utility model discloses an experimental device for brittle building material damage parameters, as shown in figures 1 and 2, comprising a test bed 1, an upper clamping device 2, a brittle building material test piece 3, a lower clamping device 4 and a digital strain gauge 5; the upper clamping device 4 and the lower clamping device 4 are arranged on the test bed 1 and driven to move along the vertical direction by a driving mechanism arranged on the test bed 1, and the upper clamping device 4 and the lower clamping device 4 are respectively tightly propped and clamped with two ends of the brittle building material test piece 3; the brittle building material test piece 3 is connected with the digital strain gauge 5 for measuring and recording the strain generated by the loading of the brittle building material test piece 3, the upper clamping device and the lower clamping device are driven to move oppositely by the driving mechanism on the test bed 1 in the scheme, the brittle building material test piece 3 placed between the upper clamping device and the lower clamping device is clamped, and then the strain data generated by the loading of the upper clamping device and the lower clamping device of the brittle building material test piece 3 is measured and recorded by the digital strain gauge 5 connected with the brittle building material test piece 3.
The digital strain gauge 5 is connected with a central processing unit 6 which is used for processing the strain data of the brittle building material test piece 3 recorded by the digital strain gauge 5 and calculating the elongation of the test piece, and is used for processing the strain data of the brittle building material test piece recorded by the digital strain gauge and calculating the elongation of the test piece according to a formula.
The central processor 6 is connected with a data display 7 for presenting the results of the experiment.
The working principle and the operation process are as follows:
s1: according to the GB/T15248-2008 requirement, a brittle building material test piece 3 is manufactured through design;
s2: on the test bed 1, an upper clamping device 2 and a lower clamping device 4 are respectively used for clamping the upper end and the lower end of the brittle building material test piece 3;
s3: sequentially connecting a brittle building material test piece 3, a digital strain gauge 5, a central processing unit 6 and a data display 7;
s4: starting a driving device which is used for driving the upper clamping device and the lower clamping device on the test bed 1, and applying a tensile load P ̽ to the brittle building material test piece 3, wherein the test piece is not damaged by P ̽;
s5: starting the digital strain gauge 5, the central processing unit 6 and the data display 7, and reading data on the data display 7 to obtain the elongation of the brittle building material test piece 3 in the loading process as 1;
s6: after unloading, applying a tensile load P (P > P ̽) to the brittle building material test piece 3 to damage the test piece, unloading the brittle building material test piece 3 after damage, and applying a tensile load P ̽ to the brittle building material test piece 3 again;
s7: by reading the data on the data display 7, the elongation of the brittle building material test piece 3 in the loading process can be recorded as 2:
s8: the damage variable D is calculated by the formula:
D=1-（1/2）；
in step S8, the formula improvement for calculating the damage variable D is as follows:
P̽/Ao=E1 （1）
wherein P ̽ is a tensile load (which does not cause specimen damage); ao is the initial cross-sectional area of the specimen; e is Young's modulus; 1 is the elongation of the test piece.
Ao=Ae+Ad （2）
D=1-(Ae/Ao) （3）
Wherein Ao is the apparent area of the test piece after being damaged by tensile load P (P is more than P ̽); ae is the effective cross-sectional area; ad is the area of damage that results in defective microcavities; d is a brittle building material damage parameter.
Combining the formulas (2) and (3), one can obtain
Ae=Ao（1-D） （4）
P̽/Ao=E2 （5）
In the formula, P ̽ is tensile load (the test piece is loaded with P ̽ after being damaged by loading); e is Young's modulus; 2 is the elongation of the test piece.
Combining the formulas (4) and (5), one can obtain
P̽/Ao=E（1-D）2 （6）
Combining the formulas (1) and (6), the method can be obtained
E1=E（1-D）2 （7）
Through equivalent transformation, the method can be obtained
D=1-（1/2） （8）
Formula (8) is promptly the utility model discloses the formula, so through twice measurement test piece damage around apply elongation (1, 2) of the production of same tensile load P ̽, just can obtain brittle building material damage parameter value D, and then can carry out comparatively accurate aassessment to brittle building material damage.
The above mentioned is only the embodiment of the present invention, not the limitation of the patent scope of the present invention, all the equivalent transformations made by the contents of the specification and the drawings or the direct or indirect application in the related technical field are included in the patent protection scope of the present invention.
Claims (3)
1. The utility model provides an experimental apparatus of brittle building material damage parameter which characterized in that: the device comprises a test bed (1), an upper clamping device (2), a brittle building material test piece (3), a lower clamping device (4) and a digital strain gauge (5);
the upper clamping device and the lower clamping device (4) are arranged on the test bed (1) and driven to move along the vertical direction through a driving mechanism arranged on the test bed (1), and the upper clamping device and the lower clamping device (4) are respectively tightly propped and clamped with two ends of the brittle building material test piece (3);
the brittle building material test piece (3) is connected with the digital strain gauge (5) for measuring and recording the strain generated by loading of the brittle building material test piece (3).
2. The experimental facility for testing the damage parameter of the brittle building material according to claim 1, wherein: the digital strain gauge (5) is connected with a central processing unit (6) which is used for processing the strain data of the brittle building material test piece (3) recorded by the digital strain gauge (5) and calculating the elongation of the test piece.
3. The experimental facility for testing the damage parameter of the brittle building material according to claim 2, wherein: the central processing unit (6) is connected with a data display (7) used for displaying the result obtained by the experiment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921450246.3U CN211235256U (en) | 2019-09-03 | 2019-09-03 | Experimental device for brittle building material damage parameter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921450246.3U CN211235256U (en) | 2019-09-03 | 2019-09-03 | Experimental device for brittle building material damage parameter |
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| CN211235256U true CN211235256U (en) | 2020-08-11 |
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| CN201921450246.3U Expired - Fee Related CN211235256U (en) | 2019-09-03 | 2019-09-03 | Experimental device for brittle building material damage parameter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110608947A (en) * | 2019-09-03 | 2019-12-24 | 南昌大学 | Experimental device and measuring method for damage parameters of brittle building material |
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2019
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110608947A (en) * | 2019-09-03 | 2019-12-24 | 南昌大学 | Experimental device and measuring method for damage parameters of brittle building material |
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Granted publication date: 20200811 Termination date: 20210903 |