Methods and corresponding computer codes are discussed for probabilistically assessing composite structural fracture. The progressive fracture of a laminated composite pressure vessel is simulated via an innovative approach independent of stress intensity factors and fracture toughness parameters. A computer code is utilized for the simulation of composite structural damage and fracture. Structural response is assessed probabilistically during degradation. The effects of design variable uncertainties on structural damage progression are quantified. The Fast Probability Integrator is used to assess the response scatter in the composite structure at damage initiation. Sensitivity of the damage response to design variables is computed. Methods are general purpose in nature and are applicable to all types of composite structures, starting from damage initiation to unstable damage propagation and collapse. Results obtained show that composite shells with through-the-thickness initial defects have about 25 percent burst pressures than those free of defects. Pipe joints with bending have about 50 percent burst pressures than those without. Fiber modulus, fiber volume ratio and ply thickness are dominant sensitivities in pipe reliability.
Probabilistic assessment of fracture in composite pressure vessels
1998
15 Seiten, 12 Quellen
Conference paper
English
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