|
![Hemispherical shell with a](thumbnails/s61.jpg) |
![How the lower bound of the collapse pressure, Pc, is determined as a function of the flattening amplitude, delta0](thumbnails/s62.jpg) |
![Molded torispherical shells fabricated of plastic ABS material. The shells have off-axis](thumbnails/s63.jpg) |
![This slide shows the buckled specimens that in the previous slide are shown before testing under external pressure](thumbnails/s64.jpg) |
![Comparison between test and theory for the torispherical shells with](thumbnails/s65.jpg) |
|
Hemispherical shell with a "flat" spot. The "imperfect" shell is to be externally pressurized |
|
How the lower bound of the collapse pressure, Pc, is determined as a function of the flattening amplitude, delta0 |
|
Molded torispherical shells fabricated of plastic ABS material. The shells have off-axis "flat" spots with geometry of the type shown two slides ago. |
|
This slide shows the buckled specimens that in the previous slide are shown before testing under external pressure |
|
Comparison between test and theory for the torispherical shells with "flat" regions spanning increasing alpha (increasing delta0) |
|
|
|
![Finite element model of externally pressurized torispherical shell with small](thumbnails/s66.jpg) |
![Buckled plastic externally pressurized, meridionally stiffened torispherical shell](thumbnails/s67.jpg) |
![350 mm diameter laminated composite torispherical shell fabricated by draping. The shell is to be tested under uniform external pressure](thumbnails/s68.jpg) |
![How the draping is done and modeled for the fabricated specimen shown in the previous slide](thumbnails/s69.jpg) |
![Failure diagram of perfect externally pressurized torispherical shells](thumbnails/s70.jpg) |
|
Finite element model of externally pressurized torispherical shell with small "flat" spot |
|
Buckled plastic externally pressurized, meridionally stiffened torispherical shell |
|
350 mm diameter laminated composite torispherical shell fabricated by draping. The shell is to be tested under uniform external pressure |
|
How the draping is done and modeled for the fabricated specimen shown in the previous slide |
|
Failure diagram of perfect externally pressurized torispherical shells |
|
|
|
![Linear buckling mode of an internally pressurized torispherical pressure vessel head](thumbnails/s71.jpg) |
![Internally pressurized torispherical vessel](thumbnails/s72.jpg) |
![Typical post-buckling pattern of an internally pressurized torispherical or ellipsoidal steel or aluminaum pressure vessel head](thumbnails/s73.jpg) |
![Axisymmetric elastic-plastic deformation of an internally pressurized ellipsoidal shell predicted by BOSOR5](thumbnails/s74.jpg) |
![Post-buckling of an internally pressurized torispherical pressure vessel head from ANSYS finite element model](thumbnails/s75.jpg) |
|
Linear buckling mode of an internally pressurized torispherical pressure vessel head |
|
Internally pressurized torispherical vessel |
|
Typical post-buckling pattern of an internally pressurized torispherical or ellipsoidal steel or aluminaum pressure vessel head |
|
Axisymmetric elastic-plastic deformation of an internally pressurized ellipsoidal shell predicted by BOSOR5 |
|
Post-buckling of an internally pressurized torispherical pressure vessel head from ANSYS finite element model |
|
|