Abstract Concrete may gain maximum flexural strength to a certain percentage with the inclusion of plastic fiber. Because weakening bonding concerning fiber and cement paste, it loses under compression at same rate gains. The optimal addition ratio must be established add Polyethylene Terephthalate (PET) concrete improve its mechanical structural qualities. To decide what will change in microst...

The main goal of this research is to study the failure behavior cement-fiber-treated sand under triaxial direct tension condition tests. Thus, a new loading system and cell was designed built for tensile loading. Samples were prepared with content cement 3 5% (dry wt.) sand, while two types polypropylene fibers 0.024 m in length 23 μm 300 thick added at 0.0% 0.5% mixture. After seven-day curing...

Brittle deformation can saturate the Earth's crust with faults and fractures in an apparently chaotic fashion. The details of brittle deformational histories and implications on, for example, seismotectonics and landscape, can thus be difficult to untangle. Fortunately, brittle faults archive subtle details of the stress and physical/chemical conditions at the time of initial strain localizatio...

The durability of concrete has a significant influence on the sustainability and resilience various infrastructures, including buildings, bridges, roadways, dams, other applications. Penetration corrosive agents intensified by exposure to freeze-thaw cycles presence early-age cracks is common cause reinforced degradation. Electrical resistivity vital physical property cementitious composites as...

At low temperatures silicon is a brittle material that shatters catastrophically, whereas at elevated temperatures, the behavior of silicon changes drastically over a narrow temperature range and suddenly becomes ductile. This brittle-to-ductile transition has been observed in experimental studies, yet its fundamental mechanisms remain unknown. Here we report an atomistic-level study of a funda...

We report a brittle Mg-based bulk metallic glass which approaches the ideal brittle behavior. However, a dimple structure is observed at the fracture surface by high resolution scanning electron microscopy, indicating some type of "ductile" fracture mechanism in this very brittle glass. We also show, from the available data, a clear correlation between the fracture toughness and plastic process...

Concrete has been prestressed traditionally with high-strength steel. The vulnerability of such material to corrosion calls for alternate materials, if thin-sheet products are to be prestressed. A research project at Columbia University is investigating the feasibility of using aramid fiber mesh for such purpose. This paper explores the chemical and mechanical properties of aramid in the form o...

Brittle nail syndrome is a heterogeneous abnormality, characterized by increased fragility of the nail plate. Brittle nails affect about 20% of the population and women are affected twice as frequently as men. The vast majority of patients experience brittle nails as a significant cosmetic problem and a substantial number indicate that these nail abnormalities are painful, impair daily activiti...

This paper presents the analysis and implementation of the variational formulation of quasi-static brittle fracture mechanics proposed by G. A. Francfort and J.-J. Marigo in 1998. We briefly present the model itself, and its variational approximation in the sense of Γ -convergence. We propose a numerical algorithm based on Alternate Minimizations and prove its convergence under restrictive assu...

BACKGROUND Anti-angiogenic therapy is a crucial step in cancer treatment. The discovery of new anti-angiogenic compounds from marine organisms has become an attractive concept in anti-cancer therapy. Because little data correlated to the pro- and anti-angiogenic efficacies of Ophiuroidea, which include brittle star, the current study was designed to explore the anti-angiogenic potential of brit...