No abstract

In the last decades, there have been many researches on the use of ethanol as biofuel, detecting corrosion processes in storage systems, including systems in bioethanol-gasoline blends. This research analyzes the phenomena that occur when exposing the API 5L X-52 steel under stress conditions and presenting the analysis to the susceptibility of the Stress Corrosion Cracking (SCC). The preparation of the test specimens was carried out under the NACE standard TM0177-05, with the results obtained and using the McIntyre diagram the susceptibility of the steel to the SCC was determined; depending on the ductility parameters. The type of fault present in each specimen was identified by Scanning Electron Microscopy (SEM). Under the experimental conditions of the present work, it has concluded that the API 5L-X52 steel exposed in the different study means is not susceptible to Stress Corrosion Cracking.

Experimental study on the mechanical behavior of polyphenylene sulfide (PPS)based composite laminates reinforced with carbon and glass fibers subjected to different strain rates under compression load is reported. Quasi-static tests have been carried out using an electromechanical universal testing machine at three different strain rates, while dynamic tests were done using a split-Hopkinson pressure bar (SHPB) apparatus at two pressure setups in the gas chamber. High-speed imaging system was used to monitor failure process during dynamic test, and these images were used to measure strain by digital image correlation (DIC) in order to compare the DIC-based measurements performed with the SPHPB strain gauges and quasi-static results. Fractography analysis was also performed to identify the main failure mechanisms induced at different strain rates.