Dynamic compression failure mechanisms and dynamic effects of integrated woven sandwich composites

Abstract

Low-velocity dynamic compression tests were performed to reveal the failure mechanism and the energy absorption capacity of the integrated woven sandwich composite. Shear deformations were induced by the tilting of fiber piles in the core of the integrated woven sandwich composite. Ductile load–displacement curves are featured by a long deformation plateau originated from rotations of the core piles. Densification is apparent in the later stage of compression. Stout piles in the core also lead to plastic compression failure mode accompanying with much smaller rotations of core piles. Controlled by the latter failure mode, the dynamic strength and the energy absorption of the panel are stronger. In dynamic compression experiments, the integrated woven sandwich composite panels exhibit similar failure modes with those observed in quasi-static compression tests. The dynamic strength is much greater and the corresponding deformation plateau is much more stable, which leads to greater energy absorption. The dynamic effects of the strength and the energy absorption were explained by the dynamic buckling of the woven struts in the core. The tests suggest that the integrated woven sandwich composite is ideal to serve as a lightweight anti-impact material in engineering structures.

Micromechanical modelling of the compression strength of three-dimensional integrated woven sandwich composites

“…This sandwich structure has the following advantages: (1) sandwich panel can be produced in a single step, and production time and costs are reduced; (2) top and bottom skins are integrally woven together with the core section, therefore the problem of skin-core delamination is solved; (3) the hollow core section can be filled by several materials and, thus, different capabilities can be given to structure [10]. The 3D IWSC panels provide high strength, low weight, thermal insulation, acoustic damping and high skin-core debonding resistance which is attractive for lightweight structures and have been increasingly used in industries such as marine, road and rail transport, automotive and aircraft industry, war industry, building and construction [9,11].…”

Numerical Study on the Projectile Impact Resistance of Multi-Layer Sandwich Panels with Cellular Cores

“…Load fluctuation is observed during the interaction and with the bending and progressive deformation of the cell sheets, the force keeps increasing. This phenomenon is also observed by ) (Xiong, et al, 2012) ( Kılıçaslan, et al, 2013) (Fan, et al, 2014). Notably, the interaction time before that projectile is rebounded from corrugation sandwich panel is extended by increasing layer numbers in lower relative density As to hexagonal honeycomb sandwich panels, increasing layer numbers can not only noticeably lower force values of structures during impact but also prolong interaction time as shown in Figure 13.…”

“…It makes the study of the projectile impact resistance of sandwich components a significant task. Much theoretical, numerical and experimental work in dynamic properties including projectile impact resistance of sandwich structures with cellular cores has been taken (Zhu, et al, 2008;Jing, et al, 2011;Yin, et al, 2013;Ni, et al, 2013;Zhang, et al, 2013;Su, et al, 2013;Fan, et al, 2014;Jiang, et al, 2014;Ebrahimi et al, 2016). Liaghat et al (2010) introduced an analytical model based on energy method to predict the ballistic limit of metallic honeycombs.…”

Experimental investigations on the failures of woven textile sandwich panels

“…11 Low-velocity flatwise compression tests were performed to reveal the dynamic behavior and strain rate effect of WTSCs. 12,13 According to the research, the woven skins of WTSCs are usually not strong enough when bearing load. Li et al 14 revealed compression responses of pyramidal truss core sandwich panels, with Euler macrobuckling, shear macrobuckling of the core, skin microbuckling, skin wrinkling, skin crushing, and other failure modes discussed.…”