{"id":404215,"date":"2025-01-09T09:05:03","date_gmt":"2025-01-09T09:05:03","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/difference-response-spectrum-analysis-and-transient-analysis-for-shock-response\/"},"modified":"2025-01-09T09:05:03","modified_gmt":"2025-01-09T09:05:03","slug":"difference-response-spectrum-analysis-and-transient-analysis-for-shock-response","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/difference-response-spectrum-analysis-and-transient-analysis-for-shock-response\/","title":{"rendered":"Difference Response Spectrum analysis and Transient analysis for shock response"},"content":{"rendered":"<p>&lt;p&gt;I have a simple aluminium I-beam clamped on one side and free on the other. I am interested in its shock response on a 60g, 10ms half-sine shock. First, I do a response spectrum analysis and i verify that with a transient analysis.&nbsp;&lt;\/p&gt;&lt;p&gt;For my shock response, I use the following settings:&lt;\/p&gt;&lt;p&gt;<img decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2025\/01\/09-01-2025-1736412223-mceclip1.png\" \/>&lt;\/p&gt;&lt;p&gt;And my input looks like this:&nbsp;&lt;\/p&gt;&lt;p&gt;<img decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2025\/01\/09-01-2025-1736412018-mceclip0.png\" \/>&lt;\/p&gt;&lt;p&gt;The tabular data contains a shock response spectrum corresponding to the half-sine shock.&nbsp;&lt;\/p&gt;&lt;p&gt;For the Transient analysis, I use the following settings:&nbsp;&lt;\/p&gt;&lt;p&gt;<img decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2025\/01\/09-01-2025-1736412253-mceclip2.png\" \/>&lt;\/p&gt;&lt;p&gt;And my input looks like this:&nbsp;&lt;\/p&gt;&lt;p&gt;<img decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2025\/01\/09-01-2025-1736412285-mceclip3.png\" \/>&lt;\/p&gt;&lt;p&gt;Here, the tabular data contains the time history half-sine shock.&nbsp;&lt;\/p&gt;&lt;p&gt;When looking at both results, I get a difference in the max equivalent stress for both analysis. For the Response Spectrum analysis, my max stress is 31.294 MPa. For the Transient Analysis, the max stress is 33.253 MPa. This is a difference of more than 6%. Why is this?&nbsp;&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-404215","topic","type-topic","status-publish","hentry","topic-tag-response-spectrum-1","topic-tag-responsespectrumanalysis-1","topic-tag-shock","topic-tag-shock-analsysis-1","topic-tag-transient-structural"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_forum_id":["27791"],"_bbp_topic_id":["404215"],"_bbp_subscription":["501319","436953","240"],"_bbp_author_ip":["77.67.86.210"],"_bbp_last_reply_id":["404534"],"_bbp_last_active_id":["404534"],"_bbp_last_active_time":["2025-01-11 13:40:22"],"_bbp_reply_count":["3"],"_bbp_reply_count_hidden":["0"],"_bbp_voice_count":["3"],"_bbp_engagement":["501319","436953","240"],"_btv_view_count":["272"],"_bbp_topic_status":["unanswered"],"_bbp_likes_count":["1"],"_bbp_notification_enabled":["501319","336760"]},"test":"8a5d225ae0bde47b8f5bace4bec85a83ae33dc28"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/404215","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\/404215\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=404215"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}