{"id":42324,"date":"2020-04-01T14:02:00","date_gmt":"2020-04-01T14:02:00","guid":{"rendered":"\/forum\/forums\/topic\/time-step-too-small-error-in-explicit-dynamics\/"},"modified":"2020-04-01T14:02:00","modified_gmt":"2020-04-01T14:02:00","slug":"time-step-too-small-error-in-explicit-dynamics","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/time-step-too-small-error-in-explicit-dynamics\/","title":{"rendered":"Time step too small error in Explicit Dynamics"},"content":{"rendered":"

Hi everyone!<\/span><\/p>\n

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I need some help with Explicit Dynamics.<\/span>I need some help with Explicit Dynamics. I’m doing a projectile penetration\/mushrooming simulation. When I try to solve it,it shows an error: TIME STEP TOO SMALL. I tried to manipulate with the solution setting and meshing (I’m not good at meshing though) but to no avail.<\/span><\/p>\n

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Here are some details:<\/span><\/p>\n

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Materials: plate explicit steel, projectile explicit brass, both eroding on max plastic strain<\/span><\/p>\n

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Geometry: projectile L=20mm, d=8mm, plate D=200mm, t=10mm, distance between the two 20mm, plane symmetry option used (90deg. is considered in computations)<\/span><\/p>\n

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Conditions: initial velocity 4e5 mm\/s, plate outer edge fixed<\/span><\/p>\n

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 I don’t really want the mesh to be coarse on the bullet, as I want to inspect its shape after the collision.<\/span><\/p>\n

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I set erosion on material failure (max strain defined in the engineering data).<\/span><\/p>\n

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To mesh the structure, I did the following:<\/span><\/p>\n

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generate general, sizing 2mm applied to the bullet, sizing 2mm with sphere of influence to the plate centre, sizing 4 elements along the plate thickness. Refining didn’t help.<\/span><\/p>\n

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 <\/p>\n","protected":false},"template":"","class_list":["post-42324","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_old_topic_id":["14504"],"_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":["4407"],"_bbp_subscription":["249342"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["42324"],"_bbp_forum_id":["27814"],"_bbp_engagement":["25","240","175158","176842"],"_bbp_voice_count":["4"],"_bbp_reply_count":["12"],"_bbp_last_reply_id":["114056"],"_bbp_last_active_id":["114056"],"_bbp_last_active_time":["2020-05-10 10:21:09"]},"test":"bobsik641"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/42324","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\/42324\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=42324"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}