Theoretical Modeling of Large Shear Deformation and Wrinkling of Plain Woven Composite

Abstract

In hot stamping operations, the primary deformation mode of plain woven textile composite is shear deformation between yarns. In-plane picture frame test is an effective method to characterize the material's shear behavior. By proposing theoretical models based on our experimental study [19,20], the present article estimates the non-linear stiffness of the textile fabric during large shear deformation and the onset of wrinkling under additional yarn tension/compression at various temperatures. The relevant properties of materials are determined from experiments, and general mathematical expressions are formulated to predict the shear energy and the critical shear angle for textile composite fabrics of similar types. In addition, the size effect of the test sample is also investigated.

Out-of-plane ply wrinkling defects during consolidation over an external radius

“…Various publications have focused on mechanisms for fibre wrinkling, such as wrinkling due to compressive loading [18] and automated fibre placement (AFP) [2]. Previous modelling of ply wrinkles has considered wrinkling of a single textile composite whilst draping over a complex geometry using traditional finite element methods [3,21] and single ply buckling models [16]. The authors are unaware of analytical models which capture multilayered wrinkling during consolidation as studied in this contribution.…”

Thermo-mechanical behavior of stretch-broken carbon fiber and thermoplastic resin composites during manufacturing

“…The tensile and in‐plane shear behaviors of continuous fiber composite reinforcements and perpregs have been deeply investigated. These modes of deformation are the most important during draping.…”

Experimental investigation of formability of woven textile composite preform in stamping operation

“…The specimen was the same as described in the previous paper [7]. A uniform circular distribution of dead weight with 10kg×8 around the edge of die was used as the blank holder force.…”

“…Direct measurements of strain were made on the stamped sample in a more precise way, so as to verify the previously proposed theoretical model of failure [7]. The wrinkling criterion is expressed as a relationship between forces and stresses, which is not convenient to measure during real stamping operation.…”

“…As for the failure of wrinkling, several researchers have carried out experimental measurements and proposed analytical models [5,6]. In particular, a theoretical criterion has been established involving all key textile parameters and material properties [7], which will be evaluated in the present paper so as to investigate material's formability and optimize the stamping conditions.…”