Tailored fibre placement to minimise stress concentrations

Crothers, Phillip; Drechsler, Klaus; Feltin, D.; Herszberg, Israel; Kruckenberg, Teresa

doi:10.1016/s1359-835x(97)00022-5

Cited by 65 publications

(23 citation statements)

References 3 publications

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“…The anisotropy evaluation is based on the principal stresses of the 2D stress tensor in a shell element, which are calculated through a coordinate system rotation by the principal angle φ 0 (Figure 6, left). In the design optimisation of composite structures and especially in tailored fibre placement processes, the principal stresses and directions are commonly used as fibre orientation angles in order to minimise shear loadings of the fibres (Crothers et al, 1997). A state of stress here is considered anisotropic if one principal stress is significantly larger than the other one, see Figure 6 (right).…”

Section: Suitability Criterion: Loading Anisotropymentioning

confidence: 99%

Suitability assessments for advanced composite-metal hybrid material systems in automotive crash structural applications

Lukaszewicz¹,

Fritsch²,

Hiermaier³

et al. 2017

IJAUTOC

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The application of hybrid material systems composed of advanced composites and metals in automotive crash structural applications holds significant potential in terms of lightweighting and functional improvements. This paper proposes a comprehensive methodology to assess the suitability of vehicle body components for the application of hybrid material systems by analysing superimposed numerical crash simulation data of conventional steel bodies-in-white. The loading anisotropy and the global deformation are presented as two suitability criteria including an evaluation methodology to eventually select suitable hybrid material systems in the transition from conventional to enhanced material employment and vehicle structure design. Additionally, the methodology provides novel insights into the global structural loading by simultaneously considering multiple crash load cases

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Section: Suitability Criterion: Loading Anisotropymentioning

confidence: 99%

Suitability assessments for advanced composite-metal hybrid material systems in automotive crash structural applications

Lukaszewicz¹,

Fritsch²,

Hiermaier³

et al. 2017

IJAUTOC

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“…Their results showed that load path trajectories outperform the principal stress direction in some special loading cases. Fiber placement technique (FPT) or technical embroidery, which is a fast prototyping technique, was introduced by Crothers et al 15 . Their numerical and testing results showed up to 55% of strength improvements for stress concentration problems such as a plate with a circular hole in tension.…”

Section: Literature Reviewmentioning

confidence: 99%

Design of Composite Layers With Curvilinear Fiber Paths Using Cellular Automata

Setoodeh¹,

Gürdal²

2003

44th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference

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The anisotropic advantageous properties of fiber reinforced composites may not be fully exploited unless the fibers are properly placed in their optimal spatial orientations. This paper investigates application of Cellular Automata (CA) for curvilinear fiber design of composite laminae for in-plane responses. CA use local rules to update both field and design variables in an iterative scheme till convergence. In the present study, displacement update rules are derived using a finite element model governing the equilibrium of the cell neighborhood and fiber angles are locally optimized based on a minimum strain energy criterion. A manufacturing improvement is applied on top of the local optimum orientation wherever this angle is not consistent with the cell neighborhood orientation trend. Numerical studies showed convergency of the local update rules and considerable improvements in the stiffness properties for a cantilever bending test and a square plate with a cutout.

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“…They have proven that the open-hole laminates, with local fibre reinforcement, have similar strengths as the un-notched plates [18,19]. In addition, the TFP technology can be used to optimise the stress distribution along the weak sections of the composite (holes/ notches) and reduce the non-preferred mode of failure [18,20].…”

Section: Introductionmentioning

confidence: 99%

Tailored fibre placement of commingled carbon-thermoplastic fibres for notch-insensitive composites

El‐Dessouky

Saleh

Gautam

et al. 2019

Composite Structures

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Tailored fibre placement (TFP) is an embroidery-based technology that allows the fibre tows to be placed exactly where they are most needed for structural performance and stitched into position on a compatible textile or polymer substrate. In this study commingled carbon-nylon fibre tows were utilised to produce thermoplastic cross-ply net-shaped preforms using TFP. Four TFP composite plaques were manufactured; baseline (blank), machined-hole, tailored-hole-1 and tailored-hole-2. Steering the tows was used to create the hole in tailoredhole-1 and tailored-hole-2. In comparison to the design of tailored-hole-1, a different fibre trajectory, with a circular reinforcement around the hole, was suggested for the tailored-hole-2. Fibre volume fraction, optical microscopy, X-ray-CT scans, tensile and open-hole tests were carried out. With the exception of the baseline sample, the modified design of tailored-hole-2 composite exhibited the highest axial strength and modulus compared to the machined-hole and tailored-hole-1 composites. Only the tailored-hole-2 specimens exhibited less than 10% reduction of the notched strength compared to the un-notched strength. This study highlights the importance of the stress/load-paths and associated fibre-orientations. While TFP can be an extremely valuable design tool for composite preforms and resulting structural components, a deep understanding of stress distributions is inevitable to achieve optimal TFP-design.

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Tailored fibre placement to minimise stress concentrations

Cited by 65 publications

References 3 publications

Suitability assessments for advanced composite-metal hybrid material systems in automotive crash structural applications

Suitability assessments for advanced composite-metal hybrid material systems in automotive crash structural applications

Design of Composite Layers With Curvilinear Fiber Paths Using Cellular Automata

Tailored fibre placement of commingled carbon-thermoplastic fibres for notch-insensitive composites

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