Journal ArticleDOI
Investigations on fracture related properties of strain hardened concrete using digital image correlation and acoustic emission techniques
TLDR
Different types of fiber reinforced concrete are being developed with the aim to improve the desired mechanical properties like tensile strength, strain carrying capacity and energy absorption capa... as discussed by the authors, which can be used to improve energy absorption and tensile properties.Citations
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Digital Image Restoration Based on Multicontour Batch Scanning
TL;DR: A research on digital image restoration based on multicontour batch scanning is proposed, aiming at the new application of digital image inpainting, the application of image inPainting in image compression is studied in depth, and the technical principles of imageInpainting and image compression are complemented.
References
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Journal ArticleDOI
Fracture process zone in concrete tension specimen
Koji Otsuka,Hidehumi Date +1 more
TL;DR: In this paper, experiments were carried out with X-rays using contrast medium and three-dimensional (3D) Acoustic Emission (AE) techniques to investigate the behavior of the fracture process zone in concrete.
Journal ArticleDOI
Compressive strength and microstructure of carbon nanotubes–fly ash cement composites
TL;DR: In this paper, carbon nanotubes of 0.5 and 1% by weight were added for the first time in a fly ash cement system to produce carbon-nanotubes-fly ash composites in the form of pastes and mortars.
Size eÄect on toughness induced by crack close to free surface
Xiaozhi Hu,Folker Wittmann +1 more
TL;DR: In this paper, the authors explain from fracture mechanics principles that the common size e•ect observed in fracturetoughness and energy measurements of many engineering materials including concrete, reinforced composites and even coarse-grained ceramics are in fact similar to what has been observed in the well-studied elastic-plasticfracture of metals.
Journal ArticleDOI
Size effect on toughness induced by crack close to free surface
Xiaozhi Hu,Folker H. Wittmann +1 more
TL;DR: In this paper, a simple asymptotic analysis of the size effect on fracture toughness and energy of a heterogeneous material such as concrete is presented. But the analysis is limited to the case where the relative crack ratio a/a ∗ or the remaining ligament ratio W−a ∆ is too close to one.
Journal ArticleDOI
Integration of the Kohonen's self-organising map and k-means algorithm for the segmentation of the AE data collected during tensile tests on cross-ply composites
TL;DR: In this paper, the authors applied Kohonen's map as an unsupervised clustering method for the acoustic emission (AE) signals generated in cross-ply composite specimens during tensile tests.