Products manufactured by autofrettage

An incrementally autofrettaged composite pressure vessel, comprising:

• a metal liner disposed about an interior volume;
• and
• a material that substantially contacts and is disposed about the metal liner;
• wherein the metal liner has been subjected to two or more cycles of incremental autofrettage;
• wherein the metal liner comprises two or more regions of autofrettaged yield strength when compared with the metal liner with an initial yield strength prior to any incremental autofrettage;
• and
• wherein a cycle life of the metal liner is increased over the same metal liner having had zero or one cycles of autofrettage when the interior volume is pressurized to a Maximum Expected Operating Pressure (MEOP), thereby producing one cycle of cycle life for the metal liner;
• whereby the autofrettaged yield strength is increased over the initial yield strength by a percentage selected from a group of percentages consisting of:
• ≥10%, ≥20%, ≥30%, ≥40%, and ≥50%;
• and
• whereby the increase in the number of cycles in the cycle life for the metal liner at the MEOP is selected from a group of factors consisting of:
• ≥2×, ≥5×, ≥10×, ≥20×, ≥50×, ≥100×, ≥200×, ≥500×, and ≥800×.