Nonlinear Finite Element Calculation of Ultimate Breakage Load for Pyro-Inflator Housing Joyson Safety Systems

Format:

Book

Conference/Event

Author/Creator:

Wang, Cheng, author.

Conference Name:

Automotive Technical Papers (2025-01-01 : Warrendale, Pennsylvania, United States)

Language:

English

Physical Description:

1 online resource cm

Place of Publication:

Warrendale, PA SAE International 2025

Summary:

Accurate prediction of the ultimate breakage pressure load for pyro-inflator housing is a critical aspect of inflator development. In this study, the tensile test of a specimen, from its initial shape to fracture, is simulated to verify the material properties of the inflator housing. The numerical results demonstrate high accuracy, with the tensile forcedisplacement curve, maximum tensile force, necking in the concentrated instability zone, fracture location, and inclined angle all closely matching the experimental data. Following material correlation, the ultimate breakage load of the inflator housing under hydrostatic burst test conditions is calculated using an explicit solver. A stress tensor state analysis method is proposed to define the ultimate load based on the onset of plastic instability in the thickness direction at the top center of the inflator. Compared to experimental results, the accuracy of the ultimate breakage pressure prediction using this method is 99.04%, while the accuracy using the arc-length implicit algorithm is 97.10%. By analyzing the stress and strain changes in key positions during uniaxial tensile and hydrostatic burst biaxial tensile tests, this method provides high precision in forecasting ultimate loads and defining fracture strains. Future work will investigate dynamic loading effects and machine learningenhanced instability criteria, with particular attention to the influence of manufacturing stamping processes on predictive model accuracy

Notes:

Vendor supplied data

Publisher Number:

2025-01-5045

Access Restriction:

Restricted for use by site license