Title Ultimate Breakage Load Calculation Method of Cold Gas Inflator Burst Disk

Abstract:

For the cold gas inflator， high refinement of ultimate load forecast is the key to the structural design of the generator. First， the zero curvature method and the RIKS method were used for burst disk hydro-burst test ultimate load calculation. Compared with the results of the real test， the refinement of both of the two methods are above 97%. Then， to solve the nonlinear contact convergence issue of the implicit algorithm， the explicit algorithm was used to solve ultimate load based on the status of stress matrix analysis results of the RIKS method. The method of stress matrix status analysis was proposed to judge the ultimate load of explicit algorithm results. In the explicit calculation， the stress change at the center of the burst disk is tracked and the corresponding load when plastic instability occurs in the thickness direction is defined as the ultimate load. The refinement of the ultimate load of the explicit algorithm is 97.4% in contrast to the real test judging by the method of stress matrix status analysis. Because of the involvement of the effect of nonlinear contact， the refinement of displacement of burst disk is better than that of the implicit method.

Key words:curtain airbag;burst disk;ultimate load;zero curvature method;RIKS method;stress matrix status analysis