CN106182330A - A kind of hypostazation method of the concrete pore structural model printed based on 3D - Google Patents
A kind of hypostazation method of the concrete pore structural model printed based on 3D Download PDFInfo
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- CN106182330A CN106182330A CN201610480774.8A CN201610480774A CN106182330A CN 106182330 A CN106182330 A CN 106182330A CN 201610480774 A CN201610480774 A CN 201610480774A CN 106182330 A CN106182330 A CN 106182330A
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- concrete
- hole
- concrete sample
- test specimen
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B1/00—Producing shaped prefabricated articles from the material
- B28B1/001—Rapid manufacturing of 3D objects by additive depositing, agglomerating or laminating of material
Abstract
The invention provides a kind of hypostazation method of concrete pore structural model printed based on 3D, the method, on the basis of existing digit model, introduces 3D printing technique, it is achieved that the hypostazation of concrete hole gap structure, and the visualization of test specimen internal stress distribution.The present invention passes through 3D printing technique, illustrates inside concrete hole situation of change intuitively.The more important thing is, utilize printed material particular attribute, can further apply in the middle of stress freezing test, and for the distribution of research hole gap structure with change and impact on mechanical performance of concrete provides brand-new thinking.
Description
Technical field
The invention belongs to that xoncrete structure is lossless thin sees detection and the technical field of physical test, be specifically related to a kind of based on
The hypostazation method of the concrete pore structural model that 3D prints.
Background technology
In view of concrete material has in the extensive application in engineering practice field, the further investigation for its physical and mechanical property
There are important engineering practice value and theory directive significance.Concrete material is to have the heterogeneous body of labyrinth, at many levels (the most micro-
See, thin see, macroscopic view) composite system, the feature such as irregular, non-linear that its molar behavior is showed is its thin microstructure
The reflection of complexity.And concrete material is under different natural environment and load action, internal void is gradually increased, and material is more
Come the most loose, cause intensity to reduce structure and destroy, this results in the confirmation of lot of experiments.Hole within concrete material
And the internal flaw such as micro-crack has close contacting with its macromechanics behavior and durability.Therefore, concrete hole gap structure
Distribution and Changeement particularly important.But the research currently for concrete pore is also limited to set up computer digit mould
Type, fails to realize the 3D solidization research of pore structure.Hinder and fundamentally solve concrete material at difference nature ring
The variation characteristic of the hole under border and load action affects problem to material breakage mechanism.
3D printing technique be a kind of based on mathematical model file, use powdery metal or plastics etc. can bind material
Material, carrys out the novel rapid shaping technique of constructed object by the way of successively printing.This technology is referred to as " third time industry leather
Order the most significant tool of production ", have been obtained for phase in fields such as product design, building, Aero-Space, medical science, education
When being widely applied.It is by for becoming displaying concrete pore structure distribution directly perceived and the technology platform of change.Meanwhile, 3D prints
Mechanics and optical characteristics that test specimen is exclusive have established solid foundation for carrying out stress freezing test from now on, for further investigation coagulation
Soil material physico mechanical characteristic provides brand-new approach.At present, 3D printing technique is also not applied to the research of problems.
Summary of the invention
The defect existed for above-mentioned prior art or deficiency, it is an object of the invention to, it is provided that a kind of based on 3D printing
The hypostazation method of concrete pore structural model.
In order to realize above-mentioned task, the present invention takes following technical solution:
A kind of method of concrete pore structural model printed based on 3D, it is characterised in that comprise the following steps that
1) utilize CT machine that concrete sample is successively scanned, obtain several two dimension faulted scanning patterns of concrete sample
Picture；
2) by step 1) gained two-dimensional digital image data import MIMICS software in dicom format, to described several two
Dimension tomoscan image carries out Threshold segmentation, obtains the hole of concrete sample and the concrete sample mathematical model containing hole；
3) mathematical model is inputted 3D printer, complete the hole of concrete sample and the concrete sample numeral containing hole
The printing test specimen of model makes；
4) synchronize printing test specimen to carry out loading and stress freezing test.
Utilize printed material distinctive stress freezing characteristic, in loading procedure, printing test specimen is carried out stress freezing, can
Obtain reaction test specimen internal stress state.
As preferably, described step 1) in, when concrete sample is carried out CT scan, selecting spacing is that 0.5mm is carried out even
Continuous scanning.
Described stress freezing test is carried out according to below with reference to document:
" rock mass labyrinth based on 3D printing technique and the method for visualizing of stress field ", Ju Yang, thank and equality, " in
State's science ", 2014, volume 59, the 32nd phase: 3109～3119.
As preferably, described step 2) comprise following sub-step:
Step 2a, sets the threshold range of concrete sample mesopore, according to the threshold range set respectively to described many
Individual two dimension tomoscan image carries out Threshold segmentation, obtains several two dimension tomoscan images of hole；
Several two dimension tomoscan images of described hole and other entities are carried out 3 d structure model by step 2b respectively
Rebuild, obtain the threedimensional model file of concrete sample.
Further, in step 2a, the optimal threshold scope of described hole is-297Hu～1374Hu.
As preferably, described step 3) aperture sections printed material is protection support lattice material, and print test specimen except hole portion
Other solid material divided is based on multiple photopolymer material, the composite synthesized by specific match ratio, this composite wood
Material has stress freezing characteristic.
As preferably, described step 3) hole uses different printing density degree from other entity except aperture sections,
And combine the base material autologous density realization differentiation to hole with other entity except aperture sections.
As preferably, described step 3) in corresponding composite to combine UV photocuring three-dimensional printing technology be by data literary composition
Part sets and uses UV light to irradiate printed material, the most successively forms and optionally completes printed sample making.
The method of the concrete pore structural model printed based on 3D of the present invention, on the basis of existing digit model,
Introduce 3D printing technique, carried out the hypostazation of concrete hole gap structure, reproduce concrete hole gap structure variation characteristic, and real
Show the visualization of test specimen internal stress distribution.By 3D printing technique, illustrate inside concrete hole change feelings intuitively
Condition.Under conditions of not relying on mould, the printing test specimen containing pore structure can be prepared.The printing test specimen obtained has directly
Seeing, molding is quick, repeatably superiority, overcomes and cannot react internal void distribution and situation of change in tradition research method
Problem.The entity test specimen of printing shaping can be used for physical mechanics test, and compensate for mathematical model cannot enter in actual tests
The defect of row application.The present invention can intuitively reflect concrete hole gap structure and the impact on mechanical performance of concrete thereof, has aobvious
The theory directive significance write and engineering practice are worth.
The more important thing is, utilize printed material particular attribute, photoelastic striped to be able to record, and be that research hole gap structure is to mixed
The impact of solidifying soil mechanics performance provides brand-new thinking.
Accompanying drawing explanation
Fig. 1 is that 3D prints the concrete model preparation flow figure in hole；
Fig. 2 is the concrete pore structure chart that the inventive method obtains.
Fig. 3 be the inventive method obtain freeze after concrete hole gap structure sample mold type.
With embodiment, the present invention is further described in detail below in conjunction with the accompanying drawings.
Detailed description of the invention
As it is shown in figure 1, the present embodiment is as a example by research concrete sample pore structure, be given a kind of based on mixing that 3D prints
The hypostazation method of solidifying soil pores structural model, operating process comprises the following steps:
Step 1: select Toshiba's Aquilion ONE 320 row's CT machine to be scanned concrete sample, obtains concrete examination
Part digital picture.Scanning voltage is 120kV, and electric current is 75mA, and picture size is 1024 pixel × 1024 pixels, sweep spacing
0.5mm；
Step 2: set the threshold range of concrete sample mesopore as-297Hu～1374Hu, according to the threshold value model set
Enclose and respectively several two dimension tomoscan images are carried out Threshold segmentation, obtain several two dimension tomoscan images of distribution of pores；
Multiple two dimension tomoscan images of described hole and other entities are carried out 3 d structure model reconstruction respectively,
Three-dimensional digital image to concrete sample.
Gained two-dimensional digital image data are imported MIMICS software in dicom format, two-dimensional digital image is carried out threshold
Value segmentation, deletes redundant data, edits mask, and mask smooths, and eventually passes through three-dimensional computations and obtains the hole of concrete sample respectively
Gap and the concrete sample mathematical model containing hole, export with STL form；
Concrete mathematical model containing hole is carried out boolean calculation acquisition, reconstruction model by overall test specimen model with hole
For regular hexahedron, the length of side is 50mm.
Step 3: the stl file of hole and the concrete sample model containing hole is simultaneously entered 3D printer, selects
Objet30 pro or configure higher printer and all can realize.
Corresponding composite is loaded in printer, in conjunction with UV photocuring three-dimensional printing technology, completes beating containing hole
Print test specimen；
It is to set by data file to use UV light to irradiate that corresponding composite combines UV photocuring three-dimensional printing technology
Printed material, the most successively forms and optionally completes to print test specimen making.
Printing test specimen aperture sections printed material is protection support lattice material, and except other solid material of aperture sections be with
Based on multiple photopolymer material, the composite synthesized by predetermined match ratio, this composite has stress freezing characteristic.
Test specimen house print porousness is controlled by printing solution；And combine the realization of base material autologous density to hole
Differentiation with other entity except aperture sections, it is achieved the simulation to concrete material mechanical property.
The present embodiment uses Objet 30 pro3D printer, high (X-axis: the 600dpi of this printer molding resolution；Y
Axle: 600dpi；Z axis: 900dpi), printing precision is 0.1mm, thickness 0.028mm；The printed material of concrete sample mesopore
For lattice support material Fullcure705, this material structure loosens, and structural strength is approximately zero, meets inside concrete sample
Hole and the practical situation of crackle；The printed material of mortar selects transparent optical polymers composite Vero Clear, and this material is
Transparent material, can be by the distribution situation of its internal hole of this material perusal.
Step 4: synchronize to load and stress freezing test to printing test specimen.Utilize the distinctive stress freezing of printed material
Characteristic, carries out stress freezing to printing test specimen in loading procedure, can obtain reaction test specimen internal stress state.The coagulation obtained
Soil pores structure chart as in figure 2 it is shown, the concrete hole gap structure sample mold type after stress freezing as shown in Figure 3.
In the present embodiment, described stress freezing test list of references: Ju Yang, thanks and equality, rock based on 3D printing technique
Body labyrinth and the method for visualizing of stress field, " Chinese science ", 2014, volume 59, the 32nd phase: 3,109 3119.
Claims (7)
1. the hypostazation method of the concrete pore structural model printed based on 3D, it is characterised in that comprise the following steps:
1) utilize CT machine that concrete sample is successively scanned, obtain several two dimension tomoscan images of concrete sample；
2) by step 1) gained two-dimensional digital image data import MIMICS software in dicom format, disconnected to several two dimensions described
Layer scanogram carries out Threshold segmentation, obtains the hole of concrete sample and the concrete sample mathematical model containing hole；
3) concrete sample mathematical model is inputted 3D printer, complete the hole of concrete sample and the concrete examination containing hole
The printing test specimen of number of packages word model makes；
4) synchronize printing test specimen to carry out loading and stress freezing test.
2. the method for claim 1, it is characterised in that described step 1) time concrete sample is carried out CT scan, choosing
Selecting spacing is that 0.5mm scans continuously.
3. the method for claim 1, it is characterised in that described step 2), set the threshold value of concrete sample mesopore
Several two dimension tomoscan images described are split respectively by scope according to the threshold range set.
4. the method for claim 1, it is characterised in that described step 2), the optimal threshold scope of described hole is-
297Hu～1374Hu.
5. the method for claim 1, it is characterised in that described step 3) aperture sections printed material is protection support lattice material
Material, and printing test specimen except other solid material of aperture sections is based on multiple photopolymer material, closes by predetermined match ratio
The composite become, this composite has stress freezing characteristic.
6. the method for claim 1, it is characterised in that described step 3) hole adopts with other entity except aperture sections
By different printing density degree, and combine base material autologous density and realize the district to hole with other entity except aperture sections
Point.
7. the method for claim 1, it is characterised in that described step 3) in corresponding composite to combine UV light solid
Changing three-dimensional printing technology is to set by data file to use UV light to irradiate printed material, the most successively forms the completeest
Become to print test specimen and make.
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Cited By (8)
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| CN106644637A (en) * | 2016-12-15 | 2017-05-10 | 山东大学 | Pervious concrete specimen manufacturing method based on CT scanning and 3D reconstruction |
| CN106710434A (en) * | 2017-02-28 | 2017-05-24 | 山东大学 | 3D printed water-permeable pavement scale simulation device and method under action of runoff |
| CN106780724A (en) * | 2016-12-21 | 2017-05-31 | 中国石油天然气股份有限公司 | Obtain the method and apparatus of leakage channel model |
| WO2018192481A1 (en) * | 2017-04-18 | 2018-10-25 | 中国矿业大学(北京) | Method for measuring stress field variations during co2 fracturing process |
| CN110672647A (en) * | 2019-09-29 | 2020-01-10 | 河海大学 | Evaluation method for grouting effect of poured asphalt concrete |
| CN110774406A (en) * | 2019-10-10 | 2020-02-11 | 长安大学 | Preparation method of permeable floor tile based on 3D printing |
| WO2020186437A1 (en) * | 2019-03-19 | 2020-09-24 | 中国矿业大学(北京) | Quantitative visualization experimentation system for induced-stress field in rock mass |
| CN114379094A (en) * | 2021-12-07 | 2022-04-22 | 宁波智造数字科技有限公司 | Method for preventing photocuring 3D printing body from generating bubble defect |
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| CN104297097A (en) * | 2014-10-20 | 2015-01-21 | 上海利物宝建筑科技有限公司 | Testing method for cohesion performance of 3D printing building mortar |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106644637A (en) * | 2016-12-15 | 2017-05-10 | 山东大学 | Pervious concrete specimen manufacturing method based on CT scanning and 3D reconstruction |
| CN106644637B (en) * | 2016-12-15 | 2019-09-03 | 山东大学 | Pervious concrete test specimen production method based on CT scan and 3D reconstruct |
| CN106780724A (en) * | 2016-12-21 | 2017-05-31 | 中国石油天然气股份有限公司 | Obtain the method and apparatus of leakage channel model |
| CN106710434A (en) * | 2017-02-28 | 2017-05-24 | 山东大学 | 3D printed water-permeable pavement scale simulation device and method under action of runoff |
| WO2018192481A1 (en) * | 2017-04-18 | 2018-10-25 | 中国矿业大学(北京) | Method for measuring stress field variations during co2 fracturing process |
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| WO2020186437A1 (en) * | 2019-03-19 | 2020-09-24 | 中国矿业大学(北京) | Quantitative visualization experimentation system for induced-stress field in rock mass |
| CN110672647A (en) * | 2019-09-29 | 2020-01-10 | 河海大学 | Evaluation method for grouting effect of poured asphalt concrete |
| CN110672647B (en) * | 2019-09-29 | 2021-06-08 | 河海大学 | Evaluation method for grouting effect of poured asphalt concrete |
| CN110774406A (en) * | 2019-10-10 | 2020-02-11 | 长安大学 | Preparation method of permeable floor tile based on 3D printing |
| CN114379094A (en) * | 2021-12-07 | 2022-04-22 | 宁波智造数字科技有限公司 | Method for preventing photocuring 3D printing body from generating bubble defect |
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