WorldCat Identities

Fresnel, Harold (1980-....).

Overview
Works: 1 works in 2 publications in 1 language and 2 library holdings
Roles: Author
Publication Timeline
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Most widely held works by Harold Fresnel
Mise en place d'une méthode d'analyse numérique de la rupture structurale des générateurs de gaz pour airbag en phase de tests destructifs by Harold Fresnel( Book )

2 editions published in 2008 in French and held by 2 WorldCat member libraries worldwide

Airbag inflator functioning is submitted to draconian safety rules for vehicle occupants. In this study, the inflator structure is a thin tube closed at both extremities, crimped and perforated with exit ports for combustion gas release. Prior to manufacturing, the pyrotechnic system undergoes validation (burst) tests. The latter consist in putting inflator combustion chamber under various dynamic pressure ramps until structure failure. This work aims at increasing the efficiency and at reducing validation tests number by using numerical simulation. In this work, we are interested in the numerical description of the dissipative response of the inflator material during the burst test induced by dynamic loading. The failure mode under ductile plastic damage is particularly studied. For obtaining reliable experimental results, a preliminary numerical study is carried out for optimising the geometry of curved samples (machined in thin small diameter tubes) regarding strain and stress fields in the gage length. The experimental campaign shows significant influence of strain hardening, plastic viscosity and ductile damage on inflator material behaviour. The GTN damage-plasticity model is used to describe the combined aforementioned effects, including cavity nucleation and growth laws as well as viscous plasticity potential. Numerical simulations considering the validation burst test problem is performed employing the engineering calculation code ABAQUS. Confrontation of numerical results with experimental ones is encouraging concerning prediction ability of the model
 
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Languages
French (2)