Papers by Keyword: Seawater Environment

Abstract: In order to study the tribological properties of titanium alloy materials and reinforced PTFE pairs treated by surface nitriding modification in seawater environment under low speed and high load, the physical properties of surface nitriding modified treatment were observed and measured with Ti-6Al-4V ELI as the substrate, and the samples of substrate and surface nitriding were modified as disks to 25% fiberglass , 15% glass fiber +5% graphite and 60% tin bronze reinforced PTFE as distribution pins, the friction properties of substrate and surface nitriding modification layer in seawater environment were studied by friction tester. The results show that the friction coefficient between titanium alloy and auxiliary pair is above 0.1, the friction coefficient of titanium alloy surface treatment specimen is lower than that of TC4 titanium alloy, the wear of surface nitriding modified treatment sample is significantly slight, the friction coefficient of 60% tin bronze distribution is the highest, and the friction coefficient of 15% fiberglass +5% graphite is about 15% higher.

Abstract: Ships have carried solid ballast for thousands of years in the form of rocks, sand or metal. In modern times, ships use water as ballast. It is more easier to load on and off a ship and more efficient and economical than solid ones. Ship fills with ballast water when it is empty of cargo, and the ballast water is discharged when it loads cargo. In ballast water ,there are hundreds of organisms carried that cause problematic ecological effects outside of their natural range. Preventing the transfer of invasive species and coordinating a timely and effective response to invasions require cooperation and collaboration between governments. Considerable efforts had already made to formulate appropriate standards for ballast water management during the convention development process. Overview

Abstract: Experiments on flexural behavior of strengthened pre-damaged reinforced concrete beams with CFRP and those exposed to seawater for different time have been carried out. By comparison, the rule of seawater effecting on failure modes of beams, fissure condition, strain development and flexural capacity, and so on have been studied. The results show that reinforcement treatment on the mechanical damaged reinforced concrete beams with bonding CFRP can effectively improve their flexural capacity and stiffness, and constrain the development of cracks. With the extension of time under seawater environment, although performance of pre-damaged beam strengthened with CFRP is influenced significantly, the strengthening effect is still more reliable.