Evaluation of the survivability of CFRP honeycomb-cored panels in compression after impact tests

Abstract

This paper is oriented to the experimental research of the mechanics of the CFRP sandwich plates, glass and carbon fiber sample panels with a large-cell honeycomb core. The method for testing polymer composite sample plates in compression after impact (CAI) tests with joint use of a testing machine and a video system for deformation field registration was tested. Analysis of the experimental data obtained highlighted the impactive sensitivity zone for the test specimens. A quantitative assessment of the load-bearing capacity of glass and carbon fiber sample panels in CAI tests with the different levels of the drop weight impact energy was performed. Photos of samples after impact have been provided. Vic-3D non-contact three-dimensional digital optical system was used to register the displacement and deformation fields on the surface of the samples. The video system was used to evaluate various damage mechanisms, including matrix cracking, delaminations, and rupture of the damaged fibers. The paper studied the evolution of non-homogeneous deformation fields on the surface of the composite samples during the post-impact compression tests and analyzed the configuration of non-homogeneous deformation fields.

Reliability and Reliability-based Sensitivity Analyses of Steel Moment-Resisting Frame Structure subjected to Extreme Actions

“…The findings of this study showed that the design process was reliable and the safety of CRSCs is considered; however, the probability failure for mid-rise CRSCs was more than low-rise prototypes [21]. Apart from the above mentioned studies, very little attention has been paid to experimental researches for understanding the structural behavior of buildings against vehicles collision due to its setup and an expensive procedure [22,23]. Therefore, this is a major reason for developing the analytical models based on probabilistic approaches to perceive the performance of buildings under vehicle impact.…”

Evaluation of the influence of preliminary low-velocity impacts on the residual fatigue life of CFRP composites

“…, 2003; Staroverov et al. , 2019, 2021). However, it is difficult to detect new defects by visual examination without specialised equipment.…”

“…These types of loads cause interlayer cracking of material structure, which may eventually lead to delamination and decreased performance of structures made of composite materials (Cantwell and Morton, 1991;Kang et al, 2005;Feng et al, 2017;Bogenfeld et al, 2020). For these load types, the main study methods are local impact tests using a falling ball weight, as well as compression tests after the impact to assess the residual strength of composite laminates (Tai et al, 1998;Suh et al, 2003;Staroverov et al, 2019Staroverov et al, , 2021. However, it is difficult to detect new defects by visual examination without specialised equipment.…”

Effect of Stitching, Stitch Density, Stacking Sequences on Low-Velocity Edge Impact and Compression after Edge Impact (CAEI) Behavior of Stitched CFRP Laminates

“…Until now, the research on impact damage characteristics of composites by domestic and foreign scholars mostly focused on the vertical impact on the center of the composite panels [9][10][11][12][13][14][15][16]. However, research on the edge impact properties of composite laminates was rare until 2008, when Malhotra [17] proposed the idea that composites near special locations such as the edges of aircraft wings, inspection ports or the edges of other holes in the aircraft are highly susceptible to edge impact from foreign objects, that scholars gradually began to investigate the edge impact and compression after edge impact performances of composites.…”