Damage tolerance of large shell structures

Progressive damage and fracture of large shell structures is investigated. A computer model is used for the assessment of structural response, progres sive fracture resistance, and defect/damage tolerance characteristics. Crit ical locations of a stiffened conical shell segment are identified Defectiv e and defect-free computer models are simulated to evaluate structural dama ge/defect tolerance. Safe pressurization levels are assessed for the retent ion of structural integrity at the presence of damage/defects. Damage initi ation, growth, accumulation, and propagation to fracture are included in th e simulations. Damage propagation and burst pressures for defective and def ect-free shells are compared to evaluate damage tolerance. Design implicati ons with regard to defect and damage tolerance of a large steel pressure ve ssel are examined.