PSI - Issue 18

Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2019) 000–000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2019) 000–000

www.elsevier.com/locate/procedia www.elsevier.com/locate/procedia

ScienceDirect

Procedia Structural Integrity 18 (2019) 432–442

© 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Gruppo Italiano Frattura (IGF) ExCo. Abstract Prediction of the mechanical response and failure behavior of laminated composites is vital for an efficient design in engineering applications. Vast quantity of failure models for composites were developed and compared in accuracy and applicability. In practice, many concerns usually appear at the material and damage model selection stage, since some models are not sensitive to important mechanical effects, while others are too complicated and require a large amount of experimental data. Presented work proposes a flexible approach for a failure modelling and initially requires only minimum of commonly available experimental data, but with possibility of extension to capture different forms of physical nonlinearity, including nonlinear shear and strain-rate effect. Proposed failure model is based on introduction of two damage parameters. Nonlinear shear response is formulated by introduction of an arbitrary polynomial shear stiffness dependency on shear strain component. Strain rate effects are considered using damage rate parameter, which has some advantages in constitutive equation formulation and practical usage. Special analytical relations for damage rate influence are presented with successful test correlation. Proposed model was implemented in commercial finite element analysis software via special user subroutines for practical computations. Numerical simulations for example problems of composites under biaxial loading and open-hole compression plate test were performed and a good correlation between theoretical and experimental results were achieved. © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Gruppo Italiano Frattura (IGF) ExCo. 25th International Conference on Fracture and Structural Integrity Failure analysis of laminated composites with shear nonlinearity and strain-rate response Alexey N. Fedorenko a,* , Boris N. Fedulov a,b , Evgeny V. Lomakin b a Center for Design, Manufacturing and Materials of Skolkovo Institute of Science and Technology, Bolshoy Boulevard 30 bd.1, 121205 Moscow, Russian Federation b Department of Theory of Plasticity, Lomonosov Moscow State University, Leninskie Gory GSP-1 , 119991 Moscow, Russian Federation Abstract Prediction of the mechanical respons and failure behavi r of laminated composites is vital for an efficient design in engineering applications. Vast quantity of failure models for composites were developed and compared in accuracy and applicability. In practice, many con erns usually appear at the material and damage model selection stage, sinc some models are not sensitive to important mechanical effects, while others are too complicated and require a large amount of experimental data. Presented work proposes a flexible approach for a failure modelling and initially requires only minimum of commonly available experimental data, but with possibility of extension to capture different f rms of physical nonlinearity, including nonlin ar shear and strain-rate effect. Proposed failure model is bas d on introduction of two damage par meters. Nonlinear shear response is formulated by intro uction of an rbitrary polynomial shear stiffness dependency on sh ar strain co ponent. Strain rate effects are considered using damage rate parameter, which has some advantages in constitutiv equation f rmulati n and practical usag . Special analytical relations for damage rate influence are resented with successful test correlation. Proposed model was implemented in commercial finite ele ent analysis software via special user subroutines for practical computations. Numerical simulations for example problems of composites under biaxial loading and open-hole compression plate test were performed and a good correlation between theoretical and experimental results were achieved. © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Gruppo Italiano Frattura (IGF) ExCo. 25th International Conference on Fracture and Structural Integrity Failure analysis of laminated composites with shear nonlinearity and strain-rate response Alexey N. Fedorenko a,* , Boris N. Fedulov a,b , Evgeny V. Lomakin b a Center for Design, Manufacturing and Materials of Skolkovo Institute of Science and Technology, Bolshoy Boulevard 30 bd.1, 121205 Moscow, Russian Federation b Department of Theory of Plasticity, Lomonosov Moscow State University, Leninskie Gory GSP-1 , 119991 Moscow, Russian Federation

Keywords: damage; laminated composites; failure criterion; nonlinearity Keywords: damage; laminated composites; failure criterion; nonlinearity

* Corresponding author. Tel.: +7 (495) 280 14 81; E-mail address: alexey.n.fedorenko@gmail.com * Corresponding author. Tel.: +7 (495) 280 14 81; E-mail address: alexey.n.fedorenko@gmail.com

2452-3216 © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Gruppo Italiano Frattura (IGF) ExCo. 2452-3216 © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Gruppo Italiano Frattura (IGF) ExCo.

2452-3216  2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Gruppo Italiano Frattura (IGF) ExCo. 10.1016/j.prostr.2019.08.185