{"id":49363,"date":"2020-10-27T07:10:17","date_gmt":"2020-10-27T07:10:17","guid":{"rendered":"\/forum\/forums\/topic\/why-is-the-measured-tyre-stiffness-behaving-contrary-to-what-we-expect-from-theory\/"},"modified":"2020-10-27T07:10:17","modified_gmt":"2020-10-27T07:10:17","slug":"why-is-the-measured-tyre-stiffness-behaving-contrary-to-what-we-expect-from-theory","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/why-is-the-measured-tyre-stiffness-behaving-contrary-to-what-we-expect-from-theory\/","title":{"rendered":"Why is the measured tyre stiffness behaving contrary to what we expect from theory?"},"content":{"rendered":"
\n
\n

Hello all,<\/p>\n

My thesis is based on the modelling a light agricultural tyre in ANSYS Mechanical. In my simulations I am subjecting the inside of the tyre to either a 2Bar or 0.8Bar as well as am applying a remote displacement to a road surface which is moved towards the tyre to cause tyre deformation. <\/p>\n

I am trying to understand what the smulation is doing but cannot understand where I am going wrong. Below I have attached my results, the solid lines represent the exisitng data that I am trying to match, and the dotted lines represent some of the simulations I have run. At this point in time I have only simulated a 2Bar, 0 camber as well as a 0.8Bar, 0camber case. <\/p>\n

I have two issues:<\/p>\n

    \n
  1. As the stiffness of the tyre is determined by the slope of the line’s in the figure below, I tried adjusting the Young's Modulus to relax the stiffness of the tyre however found that with a decrease in the Young's Modulus the stiffness increases which is the opposite effect that is expected<\/li>\n
  2. The model fairly estimates the tyres behavour for 20mm for the 2Bar case and around 30mm for the 0.8Bar case, however there after for both simulations the data points exponentially increase. <\/li>\n<\/ol>\n
    \n
    \n
    \n\"image.png\"
    \n<\/a><\/p>\n","protected":false},"template":"","class_list":["post-49363","topic","type-topic","status-closed","hentry","topic-tag-ansys-mechanical","topic-tag-deformation","topic-tag-probe-force-reaction","topic-tag-stiffness","topic-tag-stiffness-behaviour"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_old_topic_id":["21597"],"_bbp_old_topic_author_name_id":["Anonymous"],"_bbp_old_is_topic_anonymous_id":["false"],"_bbp_old_closed_status_id":["publish"],"_bbp_author_ip":["?\u0006sM"],"_bbp_old_sticky_status_id":["normal"],"_bbp_likes_count":["0"],"_btv_view_count":["646"],"_bbp_subscription":["254179"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["49363"],"_bbp_forum_id":["27791"],"_bbp_engagement":["88","240","180068"],"_bbp_voice_count":["3"],"_bbp_reply_count":["3"],"_bbp_last_reply_id":["131836"],"_bbp_last_active_id":["131836"],"_bbp_last_active_time":["2020-11-02 13:18:05"]},"test":"kirstenbraun"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/49363","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\/49363\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=49363"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}