| ABT | Maximum peak amplitude |
| Initiation | 128 $ \mu m $ |
| $ P_{1} $ | $ 128 \mu m $ |
| $ P_{2} $ | $ 127 \mu m $ |
Testing the reliability of bonded joints in material assemblies is one of the major subjects in the aeronautical industry. One of the methods for characterizing adhesion is based on the study of the roughness of the fracture surfaces of assemblies. In this study, the interest is focused on the quantification of the adhesion of the bonded structure by the corner cleavage test, allowing the study of crack propagation within bonded assemblies. Optical profilometry measurements, obtained by scanning the surface of the fractured surfaces of monoadhesives: ABT M52, copolymer-doped and non-nanostructured AHT are used. The aim of the profilometric study is to quantify surface roughness. To go further than traditional methods of characterizing roughness, we analyze the profiles using mathematical methods to confirm the experimental studies and extract more geometric information. We apply various techniques of topological data analysis (TDA) to extract the topological features of the profiles. These techniques recover experimental elements in a quantitative manner. Persistence diagrams give us a multi-scale characterization of the rupture facies, attesting the voids, micro-cracks at nano-level, quantifying the maximum amplitude of the peaks at micro level. We extract features vectors using persistent images for each profile and we look for similarities in persistence diagrams using Bottleneck and Wasserstein distances in perspective of a machine learning application in a future study. Then the profiles were studied by Takens embedding which will produce a point cloud analyzed by homological persistence in order to produce indications of periodicity or quasi-periodicity. This computational topological approach makes it possible to extract the essential characteristics of the surface and roughness of the profile of the adhesives in order to conclude on their toughness and fracture resistance.
| Citation: |
Figure 4. Filtration showm with incrising values of $ \epsilon $ (top), bottom is the corresponding persistent barcode on the left and persistence diagram on the right. Each red bar and each red point in 0-dimensional represent the a connected component, the blue barcode and the blue point in 1-dimensional represent the holes
Table 1. Maximum amplitude of ABT adhesive
| ABT | Maximum peak amplitude |
| Initiation | 128 $ \mu m $ |
| $ P_{1} $ | $ 128 \mu m $ |
| $ P_{2} $ | $ 127 \mu m $ |
Table 2. Maximum amplitude of AHT adhesive
| AHT | Maximum peak amplitude |
| Initiation | $ 300 \mu m $ |
| $ P_{1} $ | $ 200 \mu m $ |
| $ P_{2} $ | $ 300 \mu m $ |
Table 3.
Bottleneck and Wasserstein distances for the
| Persistence diagrams | Bottleneck distance | Wasserstein distance |
| (AHT) initiation - $ P_{1} $ | 0.009 | 0.020 |
| (AHT) $ P_{1} $ - $ P_{2} $ | 0.007 | 0.012 |
| (ABT) initiation - $ P_{1} $ | 0.007 | 0.023 |
| (ABT) $ P_{1} $ - $ P_{2} $ | 0.012 | 0.035 |
Table 4.
Bottleneck and Wasserstein distances for the
| Persistence diagrams | Bottleneck distance | Wasserstein distance |
| (AHT) initiation - $ P_{1} $ | 0.084 | 0.16 |
| (AHT) $ P_{1} $ - $ P_{2} $ | 0.033 | 0.14 |
| (ABT) initiation - $ P_{1} $ | 2.01e-04 | 1.6e-3 |
| (ABT) $ P_{1} $ - $ P_{2} $ | 1.8e-04 | 9.5e-4 |
Table 5. The number of peaks at different at the micro and nano level for ABT M52 adhesive. The number increases for the nano-level correspondung to the voids, micro-cracks
| Crack length of ABT | 1mm | 2mm | 3mm | 4mm | 5mm | 6mm | 7mm | 8mm | 9mm |
| $ 0.01 \mu m - 0.1 \mu m $ | 482 | 459 | 462 | 467 | 452 | 456 | 471 | 475 | 463 |
| $ 0.1 \mu m - 1 \mu m $ | 339 | 234 | 249 | 229 | 181 | 216 | 287 | 276 | 249 |
| $> 1 \mu m $ | 14 | 4 | 6 | 12 | 1 | 43 | 43 | 10 | 11 |
| ABT | 10mm | 11mm | 12mm | 13mm | 14mm | 15mm | 16mm | 17mm | |
| $ 0.01 \mu m - 0.1 \mu m $ | 473 | 459 | 456 | 437 | 455 | 438 | 448 | 476 | |
| $ 0.1 \mu m - 1 \mu m $ | 251 | 229 | 219 | 172 | 213 | 149 | 221 | 294 | |
| $> 1 \mu m $ | 26 | 17 | 11 | 4 | 22 | 6 | 6 | 23 | |
Table 6. The number of peaks at different at the micro and nano level for AHT adhesive. The number of peaks at the nano-level is half as many as ABT adhesive
| Crack length of AHT | 1mm | 2mm | 3mm | 4mm | 5mm | 6mm | 7mm | 8mm | 9mm | 10mm |
| $ 0.01 \mu m - 0.1 \mu m $ | 242 | 247 | 217 | 210 | 192 | 167 | 238 | 158 | 241 | 45 |
| $ 0.1 \mu m - 1 \mu m $ | 186 | 210 | 83 | 71 | 22 | 19 | 30 | 19 | 172 | 45 |
| $> 1 \mu m $ | 41 | 29 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| AHT | 11mm | 12mm | 13mm | 14mm | 15mm | 16mm | 17mm | 18mm | 19mm | |
| $ 0.01 \mu m - 0.1 \mu m $ | 106 | 235 | 232 | 253 | 245 | 248 | 239 | 243 | 240 | |
| $ 0.1 \mu m - 1 \mu m $ | 106 | 135 | 153 | 153 | 190 | 190 | 200 | 210 | 192 | |
| $>1 \mu m $ | 1 | 48 | 33 | 53 | 54 | 41 | 64 | 40 | 45 | |
Table 7. Sliding windows embedding size of ABT adhesive
| ABT | initiation | P1 | P2 |
| d | 3 | 3 | 3 |
| L | 6 | 4 | 5 |
| SWE size (mm) | 1.04 | 1.17 | 0.94 |
Table 8. Sliding windows embedding size of ABT M52 adhesive
| AHT | initiation | P1 | P2 |
| d | 3 | 3 | 3 |
| L | 2 | 2 | 7 |
| SWE size (mm) | 2.4 | 2.04 | 0.7 |
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Cracked facies for the AHT and ABT M52 assemblies. The crack stopped at the dotted line, for each assembly
Profiles measured by optical profilometry of AHT and ABT M52 assemblies
Nerve of cover
Filtration showm with incrising values of
On the left example of a profile and on the right 0-th persistence diagram associated
Persistent diagram (left) converts to lifetime diagram (right) and its persistence image (right)
AHT adhesive lifetime diagrams for the different jumps of the raw profile. The blue dots in the diagrams above represent the birth and death values of points in the lifetime diagram in 0-dimensional and orange dots represent
ABT M52 adhesive lifetime diagrams for the different jumps of the raw profile
The
The
The
Persistence diagram of ABT M52 adhesive for the
Distribution of the number of peaks at various scales for the AHT adhesive (top) and ABT adhesive (bottom). The abscissa corresponds to the different peak heights in micron, the ordinate represents the number of peaks
Top left: Representation of point cloud of ABT for the jump P2 and on the right the associated persistence diagram is shown
Point cloud from Takens embedding of AHT adhesive and its corresponding persistence diagram for the P2 jump