Rational hyperelastic modelling of elastic poured compound for the failure analysis of embedded rail system

Rational hyperelastic modelling of elastic poured compound for the failure analysis of embedded rail system

Wang, L. (TU Delft Railway Engineering; Southwest Jiaotong University)
Li, S. (TU Delft Railway Engineering)
Wang, Ping (Southwest Jiaotong University)
Chen, Rong (Southwest Jiaotong University)
Li, Z. (TU Delft Railway Engineering)

2022

The continuous homogeneous rail constraint of embedded rail system (ERS) is realized by the encapsulation of rails with the elastic poured compound (EPC) which is a composite material. Previous treatment of EPC as linear elastic material was insufficient in the failure analysis of ERS. In this work, a hyperelastic model is developed to describe the mechanical properties of the EPC with engineering strain up to 150%. Physical tests of uniaxial tension, planar tension and quadruple shear are conducted. A 4-parameter Ogden model is determined by curve fitting and validated with a progressive validation strategy, and then is applied to the failure analysis of ERS. It is found that the material nonlinearity of EPC contributes noticeably to the decrease of the longitudinal stiffness of ERS. The 2^nd debonding is more probably caused by the failure of adhesive at the interface between EPC and rail rather than EPC itself.

composite material
elastic poured compound
Embedded rail system
failure analysis
finite element method
hyperelastic model

http://resolver.tudelft.nl/uuid:e7d42dd7-48e2-49b9-8c1a-c3fd4356befe

https://doi.org/10.1080/23248378.2022.2118183

2324-8378

International Journal of Rail Transportation, 11 (6), 833-854

Institutional Repository

journal article

© 2022 L. Wang, S. Li, Ping Wang, Rong Chen, Z. Li