{"id":37666,"date":"2019-09-12T21:35:49","date_gmt":"2019-09-12T21:35:49","guid":{"rendered":"\/forum\/forums\/topic\/adding-a-bending-behavior-to-the-spring\/"},"modified":"2019-09-12T21:35:49","modified_gmt":"2019-09-12T21:35:49","slug":"adding-a-bending-behavior-to-the-spring","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/adding-a-bending-behavior-to-the-spring\/","title":{"rendered":"Adding a bending behavior to the Spring"},"content":{"rendered":"

Hello,<\/p>\n

I am working on a modular robotic manipulator arm to be used for fruit harvesting. I have designed the modular parts – the connector segment, the base plate and the stopper. I have modeled them in SolidWorks and combined the connector, base plate and stopper to form one body using the ‘combine’ tool in SWs so that the number of contact regions are reduced in ANSYS. I am trying out the static analysis at the maximum deflection position of 20 deg with three modules. It solves with my set up of fixed support (purple colored base ring), standard gravity in -Y direction and an applied force of 30 lbf (shown by the red arrow). The deflection and stress values seem reasonable. The material used is Al-6061. I have added springs in between the modules to represent the behavior of spring bellows\/actuators that we would need in the robotic arm. <\/p>\n

My issue is that since ANSYS provides an option for a virtual spring and it only has a longitudinal behavior, it is not resisting the deflection due to bending. As a result my end point deflection values are over 2.5 inches which is not desirable. I want to know if there is a way to add a bending behavior to these springs so that these could behave like an idealized spring actuator\/bellow. That would give me a better result related to the total deformation value and would be much closer to how the system would behave in real life. <\/p>\n

Other relevant info:
-ANSYS version -2019 – research licence
-I have used spherical joint and contacts for the ball and socket joint
-Spring K=30 lbf\/in ; preloaded with free length
– I have tried changing the behavior of the ‘reference’ and ‘mobile’ part of the spring to ‘deformable’ and ‘beam’, but there is no change in the results.<\/p>\n

If anyone has any ideas as to how to do it, kindly let me know. Do I have to physically model the spring bellows\/actuators in SWs to actually do the analysis?<\/p>\n

Regards,
\"Analysis<\/p>\n","protected":false},"template":"","class_list":["post-37666","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_old_topic_id":["9844"],"_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":["1637"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["37666"],"_bbp_forum_id":["27791"],"_bbp_engagement":["240","164848"],"_bbp_voice_count":["2"],"_bbp_reply_count":["3"],"_bbp_last_reply_id":["94656"],"_bbp_last_active_id":["94656"],"_bbp_last_active_time":["2019-09-20 23:05:12"]},"test":"yanivvk"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/37666","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\/37666\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=37666"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}