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Towards a full-scale type IV pressure vessel burst simulation using a multiscale model and the ergodic functions theory

Abstract : This dissertation focuses only on the fibre break damage mechanism controlling the failure of unidirectional composite structures. The MPFBM has described this mechanism by including the stochastic nature of fibre break, stress relaxation by viscoelastic matrix and the debonding between fibre and matrix caused by the nearby surrounding breakage. With the simplified FE2 approach, the model has been compared favourably with experimental result in the specimen level, but not for a real scale composite structure. This dissertation has evaluated a new approach based on the concept of Stationary Ergodic Random Function and Integral Range (SERFAIR) to resolve this issue. The concept of SERFAIR essentialy helps to determine a representative volume that would give a representative result in relation to the whole volume of the structure. In this way, the computation runs much faster as the number of degree of freedom has been reduced. Using this concept, the comparison study to the experimental results of racetrack specimen and a type IV PV gives a favourable results, indicating that the concept has succeeded to improve the computational speed without necessarily changing thequality of the strength prediction.
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Submitted on : Tuesday, October 12, 2021 - 10:48:30 AM
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  • HAL Id : tel-03374506, version 1

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Martinus Putra Widjaja. Towards a full-scale type IV pressure vessel burst simulation using a multiscale model and the ergodic functions theory. Mechanics of materials [physics.class-ph]. Université Paris sciences et lettres, 2020. English. ⟨NNT : 2020UPSLM073⟩. ⟨tel-03374506⟩

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