Additively manufactured reinforced structure

A vessel with grid stiffened structure, comprises:

• a wall defining a cylindrical shape;
• a first curved wall connected to a first end portion of the wall;
• a second curved wall connected to a second end portion of the wall, wherein:
• the first curved wall defines a first opening for fluid to enter the vessel;
• and
• the second curved wall defines a second opening for fluid to exit the vessel;
• a plurality of elongated ribs wherein each elongated rib is connected to the wall along a length dimension of each of the plurality of elongated ribs, wherein:
• the plurality of elongated ribs comprise a plurality of sets of four elongated ribs;
• each set forms within the four elongated ribs a parallelogram boundary shape along the wall;
• and
• the wall and the plurality of elongated ribs are constructed of a plurality of layers of material which extend in a direction transverse to a length direction of the wall;
• and
• a plurality of first transition stiffener members each comprises a first wall member which is connected to and positioned to extend along a first end portion of the wall wherein each first transition stiffener member forms a tear drop shape boundary within the first wall member along the first end portion of the wall;
• a plurality of second transition stiffener members each comprises a second wall member which is connected to and positioned to extend along a second end portion of the wall, wherein each second transition stiffener member forms a tear drop shape boundary within the second wall member along the second end portion of the wall;
• a plurality of first stiffener members are connected to and positioned to extend along the first curved wall wherein at least one of the plurality of first stiffener members comprises at least one first wall member connected to the first curved wall which forms a boundary shape with the first curved wall;
• and
• a plurality of second stiffener members are connected to and positioned to extend along the second curved wall and around the second opening, wherein at least one of the plurality of second stiffener members comprises at least one second wall member connected to the second curved wall which forms a boundary shape with the second curved wall.