Hi,
Hope someone here can help me with a problem described bellow.<\/p>\n
<\/p>\n
Construction: <\/p>\n Loads and supports: <\/p>\n Meshing: <\/p>\n Questions: <\/p>\n – <\/span><\/span><\/span>Outer plating at the intersection between longitudinal girder and outer plating.<\/p>\n <\/p>\n – <\/span><\/span><\/span>Intersection between keel plating and regular (thinner) bottom plating. This also goes for other regions where two different thicknesses of plates meet. <\/span><\/p>\n <\/p>\n How can I avoid getting these singularities and get correct results? <\/p>\n I also find it weird that the stress maximums change position from one mesh size or type to another. <\/p>\n","protected":false},"template":"","class_list":["post-35491","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_old_topic_id":["7663"],"_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":["1","1"],"_btv_view_count":["7158"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["35491"],"_bbp_forum_id":["27791"],"_bbp_engagement":["160648","165474"],"_bbp_voice_count":["2"],"_bbp_reply_count":["7"],"_bbp_last_reply_id":["86105"],"_bbp_last_active_id":["86105"],"_bbp_last_active_time":["2019-05-27 15:43:25"]},"test":"torleirh"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/35491","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\/35491\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=35491"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
I have a problem with stress singularities or at least that is what I think it is. I have designed a midsection of a ship hull and strengthened it using stiffeners and girders (see picture 1). The L stiffeners are added as cross sections to line bodies while the girders are added as surfaces with specified thicknesses. The outer plating of the hull is divided using the slice function in DM and was done to create different thicknesses for different parts (keel, walls, etc). <\/span> <\/span><\/p>\n
Tere are two loads added. One distributed force applied to the inner floor, and a hydrostatic pressure to the outer plating. The hull is simply supported in the two ends, for the whole frame (bottom, walls and girders).<\/p>\n
Have tried different mesh sizes and different mesh types (triangular and quadratic). The resulting stress increases as mesh size decreases, as one would expect in a singularity.<\/p>\n
When testing the structure, to check the equivalent (Von-Mises) stress, I get high peaks (assuming singularities) in the following regions (depending on the mesh size)<\/p>\n
And follow up: is it possible to smooth-out a transition from one plate thickness to another. (Tried the blend function in DM unsuccessful) <\/span><\/p>\n