Abstract

Abstract

Abstract

Abstract

Abstract

One of the most common methods of strengthening concrete structures is the use of composite fibers such as FRP. These fibers have found a special place in structural retrofitting methods due to a number of specific ability including lightness and ease of performance. Reinforced concrete structures have long been considered by design engineers for the possibility of retrofitting high strength composite steel structures. In this study, twenty-two steel beam models were modeled by ANSYS software. Variable parameters studied in the modeled steel beams can be referred to the number, orientation and thickness of composite layers.

Abstract

One of the most common methods of strengthening concrete structures is the use of composite fibers such as FRP. These fibers have found a special place in structural retrofitting methods due to a number of specific ability including lightness and ease of performance. Reinforced concrete structures have long been considered by design engineers for the possibility of retrofitting high strength composite steel structures. In this study, twenty-two steel beam models were modeled by ANSYS software. Variable parameters studied in the modeled steel beams can be referred to the number, orientation and thickness of composite layers.

Abstract

Fiber reinforced plastics are the current protagonist in the automotive industry, their mechanical properties and their lightweight make them unique in reducing the impact of the weight on fuel consumption. The curing of thermosetting resins as the polymer matrix for an FRP is one of the main issues facing this sector.

Through applications examples, it is demonstrated how the behavior of curing of thermosetting resins can be studied by the techniques of dielectric analysis (DEA) and differential scanning calorimetry (DSC). In-situ cure monitoring is possible by DEA.

Abstract

There are several ways to obtain the fatigue life behavior of composite materials, such as the application of classical theories or complex progressive damage models. Recently, constant life diagrams have demonstrated good effectiveness in predicting the fatigue life of CFRPs. Nevertheless, the large number of tests required, and the time necessary for the characterization, makes this method very expensive in terms of time and resources. The aim of this work is the evaluation of accelerated characterization techniques in addiction with statistical methods, to obtain constant fatigue life diagrams of CFRPs, with a reduced number of tests and a shorter characterization time. The results show that, combining universal and accelerated testing techniques with statistical methods, it is possible to obtain constant life diagram for the whole range of tension-tension, tension-compression, and compression-compression loading modes, with a reduced number of tests. Moreover, it is observed that, the accelerated characterization techniques show a fatigue life limit similar to the conventional ones.

Abstract

This paper describes the Fatigue & Damage Tolerance Phase for the S19.1 Full Component Test of the A350 XWB Aircraft.   The aim of this test was to demonstrate that the fatigue phenomena does not occurs, as well as no crack growing on composite materials. A350XWB S19.1 Full Scale test is the first test developed on a S19.1 aircraft section, therefore, the process to carry out the test constitute an important step for the development of experimental models which allow for the better understanding of this kind of aircraft component. The process carried out to obtain relevant data for the CFRP F&DT test is described in this paper: Checking point of the structure selection. Specimen instrumentation. Spectra generation. Whiffletrees selection for structure load application. Load optimization for interfaces correlation.   The FCT results shown that the fatigue and damage tolerance Certification requirements are fulfilled.