{"id":40901,"date":"2020-02-13T05:57:42","date_gmt":"2020-02-13T05:57:42","guid":{"rendered":"\/forum\/forums\/topic\/how-to-get-stresses-between-substeps-or-loadsteps\/"},"modified":"2020-02-13T05:57:42","modified_gmt":"2020-02-13T05:57:42","slug":"how-to-get-stresses-between-substeps-or-loadsteps","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/how-to-get-stresses-between-substeps-or-loadsteps\/","title":{"rendered":"How to get stresses between substeps or loadsteps?"},"content":{"rendered":"

I am modeling a uniaxial compaction test for a granular material using Ansys workbench 19 & Mechanical.<\/p>\n

<\/p>\n

There is a pack of grains in a container, and will be considered as one solid body for simplicity.<\/p>\n

<\/p>\n

One of unique physical properties of this body is that the Young’s modulus is a function of stress (not like most materials which have constant modulus – only dependent on temperatures)<\/p>\n

<\/p>\n

My model consists uniaxial loading to 6 MPa and unloading to 0 MPa. I have applied EDP plastic model to materials properties under the Geometry tree as a Command (APDL) Snippet. I set up two steps (one for loading and the other for unloading), and could solve without any troubles if I used a constant Young’s modulus.<\/p>\n

<\/p>\n

However, I wanted to change the Young’s modulus during calculation process. So, I look up the ADPL manual, and find the *Get commend. To use the command during calculation, I increased the number of steps, for example, 2 to 20 (10 steps for loading and another 10 steps for unloading). I found that the Command (APDL) Snippet inserted at Static Structural Environment worked well after every time steps if I set the Step Selection Mode to All.<\/p>\n

<\/p>\n

However, unfortunately, I cannot get the stress value after each time step when I use the *Get commend as follow:<\/p>\n

<\/p>\n

\n

<\/p>\n

!\/post1<\/p>\n

<\/p>\n

*GET,substress,NODE,100,S,EQV   ! Get the equivalent stress as stress<\/p>\n

<\/p>\n

newym = 1200*substress + 5e7<\/p>\n

<\/p>\n

 <\/p>\n

<\/p>\n

!\/prep7<\/p>\n

<\/p>\n

MP,EX,1,newym,                            ! Pa<\/p>\n

<\/p>\n

\n

<\/p>\n

This is the Solver Output<\/p>\n

<\/p>\n

*** WARNING ***                         CP =       1.172   TIME= 16:22\"\"7
 Requested data is not stored for node 100.                             
  Line= *GET, substres, NODE, 100, S, EQV                               
  The *GET command is ignored.                                           <\/p>\n

 *** WARNING ***                         CP =       1.172   TIME= 16:22\"\"7
 Unknown parameter name= SUBSTRESS.  A value of 7.888609052E-31 will be  used.                                                                  
 PARAMETER NEWYM =     50000000.00    <\/p>\n

<\/p>\n

 MATERIAL          1     EX   =  0.5000000E+08 
 *****  ANSYS SOLVE    COMMAND  *****<\/p>\n

<\/p>\n

 <\/p>\n

<\/p>\n

Please, help me to get the right values, and let me know how to use correctly the Command.<\/p>\n

<\/p>\n

(By the way, is there any way to get the equivalent stress of body during or after substeps? If possible, I might not need to make multiple time steps.)<\/p>\n

<\/p>\n

Thank you in advance!<\/p>\n","protected":false},"template":"","class_list":["post-40901","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_old_topic_id":["13081"],"_bbp_old_topic_author_name_id":["Anonymous"],"_bbp_old_is_topic_anonymous_id":["false"],"_bbp_old_closed_status_id":["publish"],"_bbp_author_ip":[null],"_bbp_old_sticky_status_id":["normal"],"_bbp_likes_count":["0"],"_btv_view_count":["1691"],"_bbp_subscription":["247473"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["40901"],"_bbp_forum_id":["27791"],"_bbp_engagement":["240","173211"],"_bbp_voice_count":["2"],"_bbp_reply_count":["1"],"_bbp_last_reply_id":["105479"],"_bbp_last_active_id":["105479"],"_bbp_last_active_time":["2020-02-16 15:34:45"]},"test":"edyijung"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/40901","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics"}],"about":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/types\/topic"}],"version-history":[{"count":0,"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/40901\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=40901"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}