“…Compression in composite specimens was induced through bending test performed on a sandwich beam type structure. 8 Figure 1.Specimen geometry for EDT (width: 20 mm). EDT: Edge delamination test.Figure 2.Four-point bending device.…”
Section: Methodsmentioning
confidence: 99%
“…The overall study on the development of a delamination criterion for laminated composite material is detailed elsewhere. 5–10…”
This study about the detection of delamination initiation is integrated into a wider project on the definition of a criterion of delamination on composite materials. It must therefore provide experimental data on the behavior of material to allow the formulation of a criterion of edge delamination as accurate as possible. Reliable experimental methods were used to identify the intrinsic parameters of the studied material. One of the most important procedures of this study consists in determining the onset of delamination in real time in order to determine stress level of delamination. Acoustic emission was used for detection of real-time damage initiation, using a location algorithm and specific pattern recognition. After correlation between experimental results and data processing, an acoustic emission signature of a delamination initiation was defined. Almost all experiments can be stopped before failure, in order to characterize damage. Extensive experimental work enabled us to verify the validity, the accuracy and the reliability of real-time delamination acoustic emission criterion.
“…Compression in composite specimens was induced through bending test performed on a sandwich beam type structure. 8 Figure 1.Specimen geometry for EDT (width: 20 mm). EDT: Edge delamination test.Figure 2.Four-point bending device.…”
Section: Methodsmentioning
confidence: 99%
“…The overall study on the development of a delamination criterion for laminated composite material is detailed elsewhere. 5–10…”
This study about the detection of delamination initiation is integrated into a wider project on the definition of a criterion of delamination on composite materials. It must therefore provide experimental data on the behavior of material to allow the formulation of a criterion of edge delamination as accurate as possible. Reliable experimental methods were used to identify the intrinsic parameters of the studied material. One of the most important procedures of this study consists in determining the onset of delamination in real time in order to determine stress level of delamination. Acoustic emission was used for detection of real-time damage initiation, using a location algorithm and specific pattern recognition. After correlation between experimental results and data processing, an acoustic emission signature of a delamination initiation was defined. Almost all experiments can be stopped before failure, in order to characterize damage. Extensive experimental work enabled us to verify the validity, the accuracy and the reliability of real-time delamination acoustic emission criterion.
“…There have been many investigations aiming the modeling of the behavior of sandwich beam under Bending load [28][29][30] has been extensively investigated for both the static 3-Point Bending [31][32][33][34][35] and static 4-Point Bending [36][37][38][39]. There are also different studies with respect to the modeling of honeycomb sandwich structures especially [40,41].…”
Sandwich structures are low-weight and have the best stiffness and a relatively high flexural strength, what makes using them continues to increase rapidly for industrial applications ranging from aeronautics, road vehicles, satellites, ships and civil engineering to mention only a few. The paper presents investigation and analysis of the behavior of composite sandwich beams with polyester resin/glass fibers skins (T800/M300) and aluminum honeycomb core under unsymmetrical bending impact. In this work we propose a numerical study using a calculation software, structural analysis by finite element method (CAST3M), for determining the stresses and displacements. The results which have been obtained after numerical modeling showed that unsymmetrical bending resistance of the sandwich beam is dependent largely on the skins.
“…Hsueh et al [9] presented the closed-form solution for the steady-state interface energy release rate of elastic arbitrary multilayered beams subjected to four-point bending. Lagunegrand et al [10] designed a four-point bending test method on a sandwich beam, which was helpful for delamination studies.…”
Hypo-atmospheric-pressure plasma was utilized to pretreat 8-shape three-dimensional (3D) woven fabric of glass fiber. After that, the bending property of composite reinforced by the 8-shape 3D woven fabric was researched. The results showed that the composite of pretreated time 1 min had maximum onset fracture load, while the composite of pretreated time 3 min had minimum onset fracture load. Moreover, the displacement of all samples was over 4 mm. By observing the scanning electron microscopy images of the fibers peeling from the composites, it could be found that the surface of the fiber became coarse after the 8-shape 3D woven fabrics were pretreated by atmospheric-pressure plasma. The coarse surface improved interfacial adhesion between fibers and resin; consequently, the onset fracture load of the composite was improved.
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