TY - GEN

T1 - Sensitivity of Angle Parameters in the Modelling of Bistable Variable Stiffness Laminates

AU - Danish, B.

AU - Suraj, K. S.

AU - Anilkumar, P. M.

AU - Rao, B. N.

N1 - Funding Information: Acknowledgements During the course of this study, the third author would like to thank the Prime Minister’s Research Fellowship, India. Publisher Copyright: © 2023, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

PY - 2023

Y1 - 2023

N2 - Bistable unsymmetric composite laminates having two stable equilibrium states have been widely investigated in recent years due to their ability to switch between stable states showing their potential for morphing applications. Although there are a significant number of studies on the behavior of bistable unsymmetrical laminates for various working conditions, conventional unsymmetrical laminate layup offers a limited design space limiting their use in practical applications. With the advancements in composite manufacturing technologies, it is possible to tailor the fiber orientations to a spatially varying pattern generating a large spectrum of improved composite layups. The spatially varying fiber paths significantly extend the design space by tailoring the stiffness parameters from one point to another in the laminate planform, and such laminates are known as variable stiffness (VS) laminates. Although it is possible to propose the varying fiber paths through various mathematical formulations, it may not be viable to generate the VS laminate layups having the pre-assigned angle parameters. This can be due to various practical reasons from the manufacturing constraints. Such unnoticed changes in fiber alignment may lead to inaccuracies in the bistable behavior. Hence it is important to check the tolerance limits and the sensitivity of VS parameters in detail. The aim of this investigation is to explore the effect of small parametric perturbations on the various angle that define VS composite laminates. In this work, design charts exploiting the change in characteristic parameters by altering the orientation angle for selected VS laminates are prepared from the numerical analysis using finite element software, ABAQUS.

AB - Bistable unsymmetric composite laminates having two stable equilibrium states have been widely investigated in recent years due to their ability to switch between stable states showing their potential for morphing applications. Although there are a significant number of studies on the behavior of bistable unsymmetrical laminates for various working conditions, conventional unsymmetrical laminate layup offers a limited design space limiting their use in practical applications. With the advancements in composite manufacturing technologies, it is possible to tailor the fiber orientations to a spatially varying pattern generating a large spectrum of improved composite layups. The spatially varying fiber paths significantly extend the design space by tailoring the stiffness parameters from one point to another in the laminate planform, and such laminates are known as variable stiffness (VS) laminates. Although it is possible to propose the varying fiber paths through various mathematical formulations, it may not be viable to generate the VS laminate layups having the pre-assigned angle parameters. This can be due to various practical reasons from the manufacturing constraints. Such unnoticed changes in fiber alignment may lead to inaccuracies in the bistable behavior. Hence it is important to check the tolerance limits and the sensitivity of VS parameters in detail. The aim of this investigation is to explore the effect of small parametric perturbations on the various angle that define VS composite laminates. In this work, design charts exploiting the change in characteristic parameters by altering the orientation angle for selected VS laminates are prepared from the numerical analysis using finite element software, ABAQUS.

UR - http://www.scopus.com/inward/record.url?scp=85172399635&partnerID=8YFLogxK

U2 - 10.1007/978-981-99-5049-2_18

DO - 10.1007/978-981-99-5049-2_18

M3 - Conference contribution

AN - SCOPUS:85172399635

SN - 9789819950485

T3 - Lecture Notes in Mechanical Engineering

SP - 217

EP - 227

BT - Advances in Reliability and Safety Assessment for Critical Systems - Proceedings of the 5th National Conference on Reliability and Safety NCRS 2022

A2 - Senthil Kumar, C.

A2 - Sujatha, R.

A2 - Muthukumar, R.

A2 - Rao, K. Balaji

A2 - Prakash, Raghu V.

A2 - Varde, Prabhakar V.

PB - Springer Science and Business Media Deutschland GmbH

T2 - 5th National Conference on Reliability and Safety (NCRS 2022)

Y2 - 10 March 2022 through 12 March 2022

ER -