Product: Abaqus/Explicit
Benefits: The linear pipe elements, already available in Abaqus/Standard, are now implemented in Abaqus/Explicit. These elements differ from the regular beam elements with a pipe cross-section as pressure loads from the internal/surrounding fluids can be prescribed and are taken into account in the constitutive response of the material. Therefore, the pipe elements are useful for modeling pipes carrying fluids under pressure and/or submerged in fluids.
Description: The elements PIPE31 and PIPE21 are now available in Abaqus/Explicit. The formulation assumes a “closed-end” condition; i.e., an internal pressure load elongates the pipe as the ends are closed. An “open-end” condition can be simulated by specifying an axial end force to relieve the axial loading from the pipe pressure load. All loading options currently available for beams are also supported for the pipes (GRAV, PX, PYNU, P1, P2NU, and incident wave loading). In addition, the pressure loads from internal and/or external fluid (PI, PE, PINU, PENU, HPI, and HPE) are also supported.
The material behavior can include elasticity with or without plasticity. Material damping is supported. Alternatively, the material behavior can be user defined. Element-based features such as mass scaling and non-structural mass are supported. The hoop stress generated from the prescribed pipe pressure loads is now reported as part of the stress output.
The section definition for pipe elements in Abaqus/Explicit must be defined using the *BEAM SECTION option.
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