Subsequent to the blog article on few functionalities in Abaqus CAE 20202x, this particular blog article mentions enhancements in Abaqus solver 2020x contacts and constraints. The enhancements would be mentioned in reverse chronological order and few of these have been introduced in FP’s of 2019x as well.
- Interference fit in Abaqus explicit: This feature has been in waiting list since long by users and its finally available now. Earlier releases of explicit had an option of strain free adjustment only for overclosures. From 2020x, if initial overclosure is “x” and interference is defined as “y”, then strain free adjustment is performed till “x-y” and rest is treated as interference being resolved through a smooth amplitude curve. That means a “two in one advantage” for explicit. Moreover, it is supported in Abaqus CAE.
Change in contact status legend: To make output more meaningful for the users, the contact status has been changed to bonded and “not in contact” as shown below. This is applicable to both standard and explicit.
Rate dependent cohesive damage: The damage initiation and damage evolution laws now have parameters to include rate dependency in cohesive contact for explicit. Earlier this feature was available in cohesive elements approach only. Effective since 2019xFD04.
- Material based general contact property assignment: The conventional process of property assignment in general contact is a three-step process. First, define sets of elements. Second, use sets to define surfaces. Third, use surfaces in property definition. From 2020x, material can be directly called for surface assignment if that approach helps. This is true for both standard and explicit.
Thermal expansion of rigid bodies: The analytical and discrete rigid bodies have been existing in Abaqus since long. However, when it comes to combined structural and thermal steps, a body very rigid from structural perspective may expand well when heated. To incorporate this effect, thermal expansion of rigid bodies feature is now included in Abaqus standard. This is applicable to kinematic couplings as well as for bodies are not explicitly defined through a CAD geometry.
- Small sliding in general contact: This is again a BIG enhancement based in users request. Small sliding substantially reduces the contact search time because it is based on flat surface approximation. When used correctly, it results in convergence improvement and less overall solution time. However, its absence in general contact was a bit bothersome. From 2020x, small sliding exists in general contact for standard.
General contact enhancement for Multiphysics: Beam elements have been introduced in general contact for thermal and thermal electrical procedures. This may be helpful in approximating some large size applications such as heat exchangers by modeling pipes as beam elements.
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