High power single mode fiber lasers are an excellent tool for micro cutting applications. In order to manage the heat input into the material most micro cutting applications require pulsed operation of the laser. Temporal pulse shaping is a proven and enabling technology for many laser welding applications with flash lamp pumped lasers where typical pulse lengths are in the order of 0.1 to 10 m...

Twisted 0.375 30 80 2,300 1 Abstract—In order to supplement the brittle property of concrete, fibers are added into concrete mixtures. Compared to general concrete, various characteristics such as tensile strength, bending strength, bending toughness, and resistance to crack are superior, and even when cracks occur, improvements on toughness as well as resistance to shock are excellent due to t...

The electro-mechanical impedance (EMI) change in Piezoelectric (PZT) sensors embedded steel-fiber-reinforced mortar (SFRM) was investigated to assess the material setting time. EMI continuously monitored for 12 h by PZT sensor SFRM having fiber volume fraction of 0.5%, 1.5%, and 2.0%. initial final time were estimated using signal change. penetration resistance test, a conventional test method ...

The use of composite materials is an effective technique to enhance the capacity of reinforced concrete columns subjected to the seismic loading due to their high tensile strength. In this paper, numerical models are developed in order to predict the experimental behavior of square reinforced concrete columns strengthened by glass fiber reinforced polymer and steel bars and unstrengthened colum...

Abstract Steel-fiber reinforced concrete slabs have good blast and spall resistance. In this study, compression splitting tensile experiments were carried out to obtain the basic quasi-static mechanical properties of steel-fiber specimens influence parameters was revealed. In-field explosion performed study dynamic responses damage modes slabs. Five typical observed, distribution law spalling f...