study of composite pressure vessel using workbench and...
TRANSCRIPT
PRESENTATION TOPICS
• Motivation
• Geometry – simplification
• Modeling
– Choice of elements
– Meshing Strategy
– Lay-up Definition and Element Orientation
– Boundary Conditions
• Post Processing
• This study was performed with the company CENIC and present the
modeling sequence of a typical pressure vessel fabricated with filament
winding process.
• Geometry, data material were provided by CENIC.
• To use the resources available in Ansys 14.0 Workbench and APDL
Motivation
• Some components were neglected for this study
– Fasteners
– Anchoring Holes
– Coupling Rings
– O-rings
• All other components were divided (cut) to allow the user to use good
meshing strategy.
– To divide by 4 parts in longitudinal directon
– To divide by 3 parts in transversal direction
• Sweep mesh. At least 2 elements through thickness
– Only brick element. Transition elements are wedges.
Geometry - simplification
• Why should one use bricks?
• Composites (laminated) elements demand
controlled mesh and brick solid elements.
Geometry - simplification
• Brick and wedge element mesh
– Swept mesh (revolution) around main cylinder axis
– Two elements through thickness to guarantee quality of results
– Named_Selection were used to define the mesh generation regions (vide
images)
– Lay-up is divide by 2 (half for each element)
– Important: laminate thickness will be correct even if there is thickness variation
(domes region). Thickness distribution of layers is proportional to the specified
lay-up.
Modeling – Meshing strategy
• APDL (Ansys Parametric Design Language) Commands were used to
define lay-up and Element Orientation
• Domes were divide in 3 transversal parts to accomodate orientation
changes with the capabilities available.
• Ansys Workbench and APDL commands were used to model the pressure
vessel in this presentation . The job would be much easier and simplified
with ACP (Ansys Composite Pre-Post) .
Lay-up Definition and Element Orientation
Typical Results
• Results visualization in the layers is done using
APDL commands
Typical APDL
commands