Application of Imaging Techniques to Mechanics of Materials by M. Grédiac (auth.), Tom Proulx (eds.)

By M. Grédiac (auth.), Tom Proulx (eds.)

This the fourth quantity of six from the once a year convention of the Society for Experimental Mechanics, 2010, brings jointly fifty eight chapters on software of Imaging ideas to Mechanics of fabrics and constitution. It provides findings from experimental and computational investigations concerning a number of imaging strategies together with restoration of 3D rigidity depth components From floor Full-field Measurements, identity of Cohesive-zone legislation From Crack-tip Deformation Fields, software of excessive pace electronic photograph Correlation for Vibration Mode form research, Characterization of Aluminum Alloys utilizing a 3D complete box dimension, and occasional pressure expense Measurements on Explosives utilizing DIC.

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Additional resources for Application of Imaging Techniques to Mechanics of Materials and Structures, Volume 4: Proceedings of the 2010 Annual Conference on Experimental and Applied Mechanics

Example text

E. delamination), the mean standard deviation for the three repeated tests is reduced. Moreover, the load/LVDT or testing machine displacements measurements offer a good repeatability between the three repeated tests. An example of 3D-DIC displacement field measurement is shown at the Figure 5 (U corresponds to the displacement in the loading direction) for a unidirectional (UD) laminate. From this field one can extract a mean value of U in a small zone near the internal radius (discrete points on the load/displacement curve), directly comparable to the displacement measured by the LVDT sensor.

FPB test ILSS test UT1 UT2 Figure 2: Different test configurations (0°-ply direction ind icated on the specimen) On each batch of 3 specimens by kind of tests, many measurements techniques are used (not always at the same time but in a complementary manner): LVDT sensor for measuring the deflection under the internal radius of the corner (Figure 3) or under the load span for ILSS tests (Figure 4), 3D Digital Image Correlation (Vic3D system [2]) on one free-edge of the specimen with black and white paint speckle for tracking of the global displacement of the specimen (and comparing it to the LVDT value) and estimation of the out-of-plane strains (Figure 4), longitudinal strain gages bonded on the upper and lower face of the specimen for following the strain in the corner radius (Figure 3), Acoustic Emission for detecting any damage event during the loading (see Figure 4).

8 mm thick insulating foam sheet equipped with a 3 mm thick low-reflection optical window. This window allowed us to focus our pair of DIC cameras on objects situated inside the chamber while controlling the specimen temperature. Through experimentation, we found that increasing the temperature of the chamber up to just above 70MC worked well and created few problems with our DIC measurements. In decreasing temperatures below 0MC, however, we began experiencing problems with condensation on the outer surface of the window.

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