Numerical modeling of impact on wood-based sandwich structures

Abstract

The impact behavior of innovative wood based sandwich structures with plywood core and skins made either of aluminum or of fiber reinforced polymer (carbon, glass, or flax composite skins) was investigated numerically. The wood based sandwich structures were subjected to low-velocity/low-energy impacts. An explicit nonlinear numerical model based on volume elements with a cohesive layer was developed. A plastic wood law already implemented in LS-DYNA was used in association with composite type damage criteria. Comparisons with experiments in terms of layer deformations and overall contact laws during impact showed satisfactory results.

Crashworthiness of poplar wood veneer tubes

“…In addition, to better understand the crush behaviour of wood tubes, advanced modelling is necessary. A very limited number of papers have dealt with the subject [17] so far and a research effort has to be made to develop material damage models for wood plies, together with efficient modelling strategies.…”

“…The force-displacement curve showed that the dynamic performance of poplar was slightly better than its static performance in the longitudinal or tangential direction (Plateau force, Energy Absorbed (EA) or Specific Energy Absorbed (SEA)). There is now renewed interest in these materials and the issue [15][16][17][18]. Some very interesting studies have also been conducted on the dynamic behaviour of coconut woods [19][20][21].…”

“…the number of plies) to improve the transverse behaviour and thus the impact response. These authors also investigated the numerical modelling of this type of impact in a preliminary manner, but this is a new field requiring a very great amount of characterization work [17]. It can therefore be argued that experimental studies on these types of materials should be done first.…”

Experimental investigation of compression and compression after impact of wood-based sandwich structures

“…In comparison with simple wood, plywood structures have much better physical properties, due to the material's better in-plane behavior. In order to develop a new structure and to compare configurations, we used two different plywood cores with four different skins [32][33][34][35]: two different configurations of plywood, named "A" and "B" and composed of different plies obtained from poplar and okoume wood that were bonded together using Melamine Urea Formaldehyde (MUF) resin. The stacking sequences of okoume and poplar plies are given in Table . 1.…”

“…The authors of this paper have recently studied the manufacturing and the static behavior of sandwiches made with plywood core and different skins made of aluminum, glass, carbon and flax fiber laminates [32], and their low velocity, low energy impact response [33]. A first attempt to model the impact damage has been proposed [34] and the present paper focuses on compression and compression after impact (CAI) tests performed on the nine types of wood-based sandwich structures studied in [32][33][34]. Materials used in this study will be recalled briefly in the form of some impact results.…”