Soft body impact on composites: Delamination experiments and advanced numerical modelling

Jagan Selvaraj; Luiz F Kawashita; Mehdi Yasaee; Gordon Kalwak; Stephen R Hallett

doi:10.1016/j.compscitech.2021.108777

Soft body impact on composites: Delamination experiments and advanced numerical modelling

Jagan Selvaraj^*, Luiz F Kawashita , Mehdi Yasaee, Gordon Kalwak, Stephen R Hallett

^*Corresponding author for this work

Research output: Contribution to journal › Article (Academic Journal) › peer-review

6 Citations (Scopus)

63 Downloads (Pure)

Abstract

Cohesive interface elements have become commonly used for modelling composites delamination. However, a limitation of this technique is the fine mesh size required. Here, a novel cohesive element formulation is proposed and demonstrated for modelling the numerical cohesive zone with equal fidelity but fewer elements in comparison to a linear cohesive element formulation. The newly proposed formulation has additional degrees of freedom in the form of nodal rotations which when combined with the use of multiple integration points per cohesive element, allows for delamination propagation to be modelled with increased stability. This element formulation is introduced with an adaptive modelling method, termed Adaptive Mesh Segmentation (AMS). To demonstrate its effectiveness under impact loading the new model is applied to a soft body beam bending test. This test, containing a delamination pre-crack, uses inertial constraints and results in a dynamic stress state when impacted by a gelatin cylinder.

Original language	English
Article number	108777
Number of pages	8
Journal	Composites Science and Technology
Volume	208
Early online date	20 Mar 2021
DOIs	https://doi.org/10.1016/j.compscitech.2021.108777
Publication status	Published - 26 May 2021

Bibliographical note

Funding Information:
This work was supported by the Engineering and Physical Sciences Research Council (EPSRC) through the Centre for Doctoral Training in Advanced Composites at the University of Bristol (Grant no. EP/L016028/1 ). The authors would also like to acknowledge Rolls-Royce plc for their support of this research through the Composites University Technology Centre (UTC) at the University of Bristol .

Publisher Copyright:
© 2021 Elsevier Ltd

Keywords

Impact behaviour
Delamination
Finite element analysis (FEA)
Cohesive element formulation

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This is the author accepted manuscript (AAM). The final published version (version of record) is available online via Elsevier at https://doi.org/10.1016/j.compscitech.2021.108777 . Please refer to any applicable terms of use of the publisher.
Accepted author manuscript, 906 KBLicence: CC BY-NC-ND

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Advanced numerical methods for modelling impact in composite materials
Selvaraj, J. (Author), Kawashita , L. F. (Supervisor), Melro, A. R. (Supervisor) & Hallett, S. R. (Supervisor), 25 Jan 2022
Student thesis: Doctoral Thesis › Doctor of Philosophy (PhD)

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abstract = "Cohesive interface elements have become commonly used for modelling composites delamination. However, a limitation of this technique is the fine mesh size required. Here, a novel cohesive element formulation is proposed and demonstrated for modelling the numerical cohesive zone with equal fidelity but fewer elements in comparison to a linear cohesive element formulation. The newly proposed formulation has additional degrees of freedom in the form of nodal rotations which when combined with the use of multiple integration points per cohesive element, allows for delamination propagation to be modelled with increased stability. This element formulation is introduced with an adaptive modelling method, termed Adaptive Mesh Segmentation (AMS). To demonstrate its effectiveness under impact loading the new model is applied to a soft body beam bending test. This test, containing a delamination pre-crack, uses inertial constraints and results in a dynamic stress state when impacted by a gelatin cylinder.",

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AU - Kawashita , Luiz F

AU - Yasaee, Mehdi

AU - Kalwak, Gordon

AU - Hallett, Stephen R

N1 - Funding Information: This work was supported by the Engineering and Physical Sciences Research Council (EPSRC) through the Centre for Doctoral Training in Advanced Composites at the University of Bristol (Grant no. EP/L016028/1 ). The authors would also like to acknowledge Rolls-Royce plc for their support of this research through the Composites University Technology Centre (UTC) at the University of Bristol . Publisher Copyright: © 2021 Elsevier Ltd

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N2 - Cohesive interface elements have become commonly used for modelling composites delamination. However, a limitation of this technique is the fine mesh size required. Here, a novel cohesive element formulation is proposed and demonstrated for modelling the numerical cohesive zone with equal fidelity but fewer elements in comparison to a linear cohesive element formulation. The newly proposed formulation has additional degrees of freedom in the form of nodal rotations which when combined with the use of multiple integration points per cohesive element, allows for delamination propagation to be modelled with increased stability. This element formulation is introduced with an adaptive modelling method, termed Adaptive Mesh Segmentation (AMS). To demonstrate its effectiveness under impact loading the new model is applied to a soft body beam bending test. This test, containing a delamination pre-crack, uses inertial constraints and results in a dynamic stress state when impacted by a gelatin cylinder.

AB - Cohesive interface elements have become commonly used for modelling composites delamination. However, a limitation of this technique is the fine mesh size required. Here, a novel cohesive element formulation is proposed and demonstrated for modelling the numerical cohesive zone with equal fidelity but fewer elements in comparison to a linear cohesive element formulation. The newly proposed formulation has additional degrees of freedom in the form of nodal rotations which when combined with the use of multiple integration points per cohesive element, allows for delamination propagation to be modelled with increased stability. This element formulation is introduced with an adaptive modelling method, termed Adaptive Mesh Segmentation (AMS). To demonstrate its effectiveness under impact loading the new model is applied to a soft body beam bending test. This test, containing a delamination pre-crack, uses inertial constraints and results in a dynamic stress state when impacted by a gelatin cylinder.

KW - Impact behaviour

KW - Delamination

KW - Finite element analysis (FEA)

KW - Cohesive element formulation

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DO - 10.1016/j.compscitech.2021.108777

M3 - Article (Academic Journal)

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VL - 208

JO - Composites Science and Technology

JF - Composites Science and Technology

M1 - 108777

ER -

Soft body impact on composites: Delamination experiments and advanced numerical modelling

Abstract

Bibliographical note

Keywords

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Student theses

Advanced numerical methods for modelling impact in composite materials

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