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

Zhu, Bo; Yu, Tongxi; Zhang, Hui; Tao, Xiaoming

doi:10.1007/s12289-008-0219-5

Cited by 14 publications

(7 citation statements)

References 8 publications

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“…the automotive industry. To this end, the pressure created by the blank holder over the course of the process cycle has been subject to optimization with the purpose of avoiding wrinkling [4,5]. Recently, the concept of a multi-punch tool with individually controllable segments has also been investigated [6].…”

Section: Introductionmentioning

confidence: 99%

Generation of feasible gripper trajectories in automated composite draping by means of optimization

Krogh

Sherwood

Jakobsen

2019

Advanced Manufacturing: Polymer & Composites Science

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Prepreg composites find great applicability in e.g. the automotive and aerospace industries. A major challenge with this class of material systems is the accurate placement of a fabric that can be very tacky and hence sticks to the mold surface. In this study, automatic draping of entire plies of woven prepregs is considered. A robot end effector with a grid of actuated grippers is under development and it has the ability to position the plies onto doublecurved mold surfaces of low curvature. The key issue is how the grippers of the end effector should move to achieve successful drapings of the plies that meet the quality requirements of the industry. In this study, an approximate ply model based on cables with bending stiffness is applied in an optimization framework where the gripper movements constitute the design variables. The optimization framework has taken inspiration from manual layup procedures. The numerical draping results indicate the usefulness of the cable model used in connection with the optimization framework. The next step is to implement the generated gripper trajectories on the physical robot system.

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Section: Introductionmentioning

confidence: 99%

Generation of feasible gripper trajectories in automated composite draping by means of optimization

Krogh

Sherwood

Jakobsen

2019

Advanced Manufacturing: Polymer & Composites Science

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“…An energy-based model to predict the wrinkle initiation in the PWCPs has been proposed by Zhu et al [ 2 , 11 , 12 ]. The study developed an analytical criterion based on the assumption that wrinkles initiate whenever the energy required for in-plane shear deformation mode becomes greater than that of the out-of-plane deformation mode.…”

Section: Introductionmentioning

confidence: 99%

A Mesoscopic Analytical Model to Predict the Onset of Wrinkling in Plain Woven Preforms under Bias Extension Shear Deformation

et al. 2017

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A mesoscopic analytical model of wrinkling of Plain-Woven Composite Preforms (PWCPs) under the bias extension test is presented, based on a new instability analysis. The analysis is aimed to facilitate a better understanding of the nature of wrinkle formation in woven fabrics caused by large in-plane shear, while it accounts for the effect of fabric and process parameters on the onset of wrinkling. To this end, the mechanism of wrinkle formation in PWCPs in mesoscale is simplified and an equivalent structure composed of bars and different types of springs is proposed, mimicking the behavior of a representative PWCP element at the post-locking state. The parameters of this equivalent structure are derived based on geometric and mechanical characteristics of the PWCP. The principle of minimum total potential energy is employed to formluate the model, and experimental validation is carried out to reveal the effectiveness of the derived wrinkling prediction equation.

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“…Although continuous fiber reinforced thermoplastic composites has excellent mechanical properties, it is difficult to mold complex shaped products such as the ribs and bosses because of the limitation in their formability [5], [6].…”

Section: Introductionmentioning

confidence: 99%

Effects of Press Pressure on the Mechanical Properties of Rib Root for Glass Fiber Reinforced Polypropylene Composites, Molded by Press and Injection Hybrid Molding

Tanaka¹,

Karasuno²,

Noguchi³

et al. 2017

Materials and Contact Characterisation VIII

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The press and injection hybrid molding system, which is a novel molding technology with the combination of press molding and injection molding, is expected for the production of FRTP (Fiber Reinforced Thermoplastics) with complicated shapes and high levels of stiffness and strength. Press and injection hybrid molded structures consist of an outer shell laminate of continuous fiber and injected short or long fiber reinforced thermoplastics which form the rib structure. The higher mold temperature was reported to increase the strength of the interface between the outer shell laminate and injected material. On the other hand, the penetration of continuous fibers of the outer shell laminate into the rib structure decreases the mechanical properties of the outer shell laminate. While the effects of mold temperature on the mechanical properties of hybrid molded composites were clarified, the effects of press pressure have not been clarified yet. In this study, the effects of the press pressure on the mechanical properties of the outer shell laminate and interfacial strength between the outer shell laminate and injected material were evaluated. As the lower press pressure decreases, the penetrated height of continuous fiber into the rib structure, higher in-plane tensile strength and lower interfacial strength, are obtained.

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

Cited by 14 publications

References 8 publications

Generation of feasible gripper trajectories in automated composite draping by means of optimization

Generation of feasible gripper trajectories in automated composite draping by means of optimization

A Mesoscopic Analytical Model to Predict the Onset of Wrinkling in Plain Woven Preforms under Bias Extension Shear Deformation

Effects of Press Pressure on the Mechanical Properties of Rib Root for Glass Fiber Reinforced Polypropylene Composites, Molded by Press and Injection Hybrid Molding

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