Quasi-static mechanical properties of novel generalized Resch-pattern composite foldcores

Abstract

<jats:p> A new geometric design method for foldcores based on the generalized Resch patterns that allow face-to-face bonding interfaces between the core and the skins is proposed. Based on the geometric design method, a systematic numerical investigation on the quasi-static mechanical properties of the generalized Resch-based foldcores made of carbon fiber-reinforced plastic (CFRP) woven fabrics subjected to compression and shear loads is performed using the finite element method that is validated by experiments. The relationships between the mechanical properties and various geometric parameters as well as laminate thickness of the generalized Resch-based CFRP foldcores are revealed. Additionally, the mechanical properties of the generalized Resch-based CFRP foldcore are compared to those of the standard Resch-based, Miura-based foldcore, the honeycomb core, and the aluminum counterpart. It is found that the generalized Resch-based CFRP foldcore performs more stably than the honeycomb core under compression and has higher compressive and shear stiffnesses than the standard Resch-based and Miura-based foldcores and absorbs as nearly twice energy under compression as the Miura-based foldcore does. When compared with the aluminum counterpart, the CFRP model has higher weight-specific stiffness and strength but lower energy absorption capacity under shearing. The results presented in this paper can serve as the useful guideline for the design of the generalized Resch-based composite foldcore sandwich structures for various performance goals. </jats:p>

CFRP cylindrical tubes equipped with thin-walled semi-circular lateral corrugated inner stiffeners subjected to quasi-static latitudinal impact

“…Additionally, previous researchers only focused on the crashworthiness of the thinwalled energy absorber tubes when subjected to axial crushing loads, lateral compression, or three-point bending. [37][38][39][40][41][42] According to the literature review, there will be a significant improvement in bending stiffness, structural crashworthiness, and weight reduction if a semicircular lateral corrugated CFRP core is applied to the cylindrical tube.…”

“…Additionally, previous researchers only focused on the crashworthiness of the thin-walled energy absorber tubes when subjected to axial crushing loads, lateral compression, or three-point bending. 37–42…”