{"id":305220,"date":"2023-09-06T22:53:44","date_gmt":"2023-09-06T22:53:44","guid":{"rendered":"\/forum\/forums\/topic\/instantaneous-annealing-and-creep-to-represent-melting-and-re-solidifying\/"},"modified":"2023-09-06T22:53:44","modified_gmt":"2023-09-06T22:53:44","slug":"instantaneous-annealing-and-creep-to-represent-melting-and-re-solidifying","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/instantaneous-annealing-and-creep-to-represent-melting-and-re-solidifying\/","title":{"rendered":"Instantaneous annealing and creep to represent melting and re-solidifying"},"content":{"rendered":"

Hello!<\/p>\n

In the two sources listed at the end of this post, the authors describe using instantaneous annealing and creep to represent resetting the stress and strain to zero (i.e., removing the stress and strain history) when a portion of the simulated geometry surpasses a specified relaxation temperature. This is done to represent the effects of the material melting and re-solidifying involved in an additive manufacturing process.<\/p>\n

I have a similar simulation, where my simulation involves a one-way coupling between transient thermal and transient structural. In transient thermal, I am using APDL command objects to represent a moving heat source, and in transient structural I want to represent the material melting and re-solidifying as the temperature changes due to the heat source (using APDL command objects). I am using nonlinear material proerties and a multilinear, temperature-dependent stress-strain relation. Currently I am having issues that, when I use EALIVE to bring back killed elements, the deformation is very high and the simulation diverges. I suspect that I need to do something similar to what is described in the sources below to address this.<\/p>\n

How do I accomplish something similar in my simulations as was done in the sources listed below? Does it seem like this will address my issue?<\/p>\n

 <\/p>\n

 <\/p>\n

One of my previous posts asked a related question (here: \/forum\/forums\/topic\/setting-plastic-strain-and-stress-to-zero-above-a-stress-relaxation-temperature\/<\/a>), but I tried implementing the given suggestion and the results of the simulation were unchanged (high deformations and divergence still occurs). <\/p>\n

I also found a similar post on the forums (here: \/forum\/forums\/topic\/applying-instantaneous-stress-and-strain-relief\/<\/a>), but I do not fully understand the answer that was given. <\/p>\n

 <\/p>\n

 <\/p>\n

SOURCES:<\/p>\n

1). Denlinger, Erik R., Jarred C. Heigel, and Panagiotis Michaleris. “Residual stress and distortion modeling of electron beam direct manufacturing Ti-6Al-4V.” <\/span>Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture<\/em> 229.10 (2015): 1803-1813.<\/span><\/span><\/p>\n

2). Song, X., et al. “Residual stresses and microstructure in powder bed direct laser deposition (PB DLD) samples.” <\/span>International Journal of Material Forming<\/em> 8 (2015): 245-254.<\/span><\/span><\/p>\n

 <\/p>\n

Thank you!<\/span><\/span><\/p>\n

 <\/p>\n","protected":false},"template":"","class_list":["post-305220","topic","type-topic","status-closed","hentry","topic-tag-additive-manufacturing","topic-tag-apdl","topic-tag-large-deformation","topic-tag-material-properties","topic-tag-transient-structural"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t