{"id":366259,"date":"2024-05-09T10:31:08","date_gmt":"2024-05-09T10:31:08","guid":{"rendered":"\/forum\/forums\/topic\/why-the-sticking-zone-is-not-shown-in-the-contact-patch\/"},"modified":"2024-05-09T10:58:55","modified_gmt":"2024-05-09T10:58:55","slug":"why-the-sticking-zone-is-not-shown-in-the-contact-patch","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/why-the-sticking-zone-is-not-shown-in-the-contact-patch\/","title":{"rendered":"Why the sticking zone is not shown in the contact patch ?"},"content":{"rendered":"
Dear community, I need your support about my simulation.<\/div>\n
I want to analyse the contact between a rolling wheel and rail as it is shown in the picture using ANSYS APDL but my results are not as was expected like specially the repartition of the stick and slip zones which is given in APDL by contact status. i don’t know why there is no stick zone in the contact patch ? the contact status indicates always that the wheel is in sliding status even when the wheel is not moving. Please let me know if you have any suggestions or corrections to my issue ????????????????????????. The contact is frictionnal and symmetric. <\/div>\n
To simulate the rolling motion of a loaded wheel, I defined three steps:<\/div>\n
-step1: the bottom side of the rail is fixed and symmetry boundary conditions are applied to the left side of the wheel and rail.<\/div>\n
-step2: the symmetry bcs are removed from the left side of the wheel and the the pilot node is free to move in vertical direction . the load (FZ=-75000N) is applied to the pilot node<\/div>\n
– step4 : translation velocity (Vx=50km\/h) and angular velocity (Omgy)and are applied at the pilot node.<\/div>\n
 <\/div>\n
Here is the code corresponding to these load steps:<\/div>\n
\n
 <\/div>\n
!Clamp the rail bottom<\/div>\n
asel,s,area,,42<\/div>\n
da,all,all  <\/div>\n
allsel,all<\/div>\n
 <\/div>\n
! Constrain symmetrical plane<\/div>\n
asel,s,area,,17<\/div>\n
asel,s,area,,37<\/div>\n
asel,a,area,,40<\/div>\n
da,all,UX <\/div>\n
da,all,Uy <\/div>\n
 <\/div>\n
!fix the pilot node<\/div>\n
D,NODENUMBER+1,all<\/div>\n
 <\/div>\n
allsel,all<\/div>\n
eplot<\/div>\n
 <\/div>\n
Finish<\/div>\n
 <\/div>\n
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!<\/div>\n
\/SOLU   <\/div>\n
ANTYPE,4<\/div>\n
nlgeom,on<\/div>\n
TRNOPT,FULL,,,,,NMK<\/div>\n
TINTP,HISP!GAMMA = 0.005<\/div>\n
KBC,0 <\/div>\n
RESCONTROL,,NONE,None <\/div>\n
autots,off<\/div>\n
OUTRES,ALL,ALL<\/div>\n
 <\/div>\n
!step1 charging a static wheel  <\/div>\n
Time,0.001 <\/div>\n
DELTIM,dt,dt,dt<\/div>\n
TIMINT,off   <\/div>\n
DDele,NODENUMBER+1,Uz<\/div>\n
F,NODENUMBER+1 ,FZ,-Cn <\/div>\n
Allsel  <\/div>\n
Solve   <\/div>\n
 <\/div>\n
!step2 rolling <\/div>\n
!inserting speed values  <\/div>\n
Time,0.002 <\/div>\n
DELTIM,dt,dt,dt <\/div>\n
TIMINT,on  <\/div>\n
asel,s,area,,17<\/div>\n
DADELE,all,ALL <\/div>\n
D,NODENUMBER+1,omgy,Wr<\/div>\n
D,NODENUMBER+1,velx,V<\/div>\n
Allsel  <\/div>\n
SOLVE   <\/div>\n
 <\/div>\n
!pick up solution stage d=115mm<\/div>\n
Time,0.00978<\/div>\n
DELTIM,dt,dt,dt  <\/div>\n
TIMINT,on <\/div>\n
Allsel  <\/div>\n
SOLVE  <\/div>\n
\"\"<\/a><\/div>\n<\/div>\n
Please find attached the contact status corresponding to the last set of :<\/div>\n
-Charging stage:<\/div>\n
\"\"<\/a><\/div>\n
\"\"– Rolling stage<\/a><\/div>\n
\"\"<\/a><\/div>\n
Best regards,<\/div>\n","protected":false},"template":"","class_list":["post-366259","topic","type-topic","status-closed","hentry","topic-tag-apdl","topic-tag-contact","topic-tag-mechanical","topic-tag-simulation","topic-tag-structures","topic-tag-transient-structural"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_subscription":["56556","18229"],"_bbp_author_ip":["23.196.2.137"]," _bbp_last_reply_id":["0"]," _bbp_likes_count":["0"],"_btv_view_count":["249"],"_bbp_topic_status":["unanswered"],"_edit_lock":["1715252080:186043"],"_bbp_topic_id":["366259"],"_bbp_forum_id":["27791"],"_bbp_engagement":["18229","56556"],"_bbp_voice_count":["2"],"_bbp_reply_count":["2"],"_bbp_last_reply_id":["366798"],"_bbp_last_active_id":["366798"],"_bbp_last_active_time":["2024-05-14 16:02:17"]},"test":"hajar-rhylaneetu-uae-ac-ma"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/366259","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":2,"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/366259\/revisions"}],"predecessor-version":[{"id":366268,"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/366259\/revisions\/366268"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=366259"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}