{"id":41466,"date":"2020-03-04T08:14:40","date_gmt":"2020-03-04T08:14:40","guid":{"rendered":"\/forum\/forums\/topic\/linear-buckling-negative-load-multiplier\/"},"modified":"2020-03-04T08:14:40","modified_gmt":"2020-03-04T08:14:40","slug":"linear-buckling-negative-load-multiplier","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/linear-buckling-negative-load-multiplier\/","title":{"rendered":"Linear buckling (negative load multiplier)"},"content":{"rendered":"<p>Hello !<\/p>\n<p><\/p>\n<p>I am working on the buckling of a structure loaded with hydrostatic pressure (see picture). The structure is composed of shell elements. When I plot all the modes, I have negative load multipliers for every modes. I have read that negative load multiplier significate that the reverse applied load would create buckling in the structure. Why do I have just negative load multiplier here ? Does it mean that my structure is well design for buckling ?&nbsp;<\/p>\n<p><\/p>\n<p>I also noticed that modes change with the number of modes used in the analysis settings. Can someone explain me why ?&nbsp;<\/p>\n<p><\/p>\n<p><img decoding=\"async\" src=\"https:\/\/us.v-cdn.net\/6032193\/uploads\/attachments\/84184e92-c953-419c-8797-ab7400811e09\/b6b3478e-2b6d-44da-a5b7-ab740084ba45_capture.jpg?width=690&amp;upscale=false\" alt=\"structure description\">&nbsp;<\/p>\n<p><\/p>\n<p><img decoding=\"async\" src=\"https:\/\/us.v-cdn.net\/6032193\/uploads\/attachments\/84184e92-c953-419c-8797-ab7400811e09\/75da1dde-57a6-4e17-91a5-ab740084e186_capture2.jpg?width=690&amp;upscale=false\" alt=\"\"><\/p>\n<p><\/p>\n<p><img decoding=\"async\" src=\"https:\/\/us.v-cdn.net\/6032193\/uploads\/attachments\/84184e92-c953-419c-8797-ab7400811e09\/e4e3d1fc-8bf4-410e-b05b-ab740084f0ee_capture3.jpg?width=690&amp;upscale=false\" alt=\"\"><\/p>\n<p><\/p>\n<p>Thank you a lot for your answers !<\/p>\n<p><\/p>\n<p>Zo&euml;<\/p>\n","protected":false},"template":"","class_list":["post-41466","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"Hello ! I am working on the buckling of a structure loaded with hydrostatic pressure (see picture). The structure is composed of shell elements. When I plot all the modes, I have negative load multipliers for every modes. I have read that negative load multiplier significate that the reverse applied load would create buckling in\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<link rel=\"canonical\" href=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/linear-buckling-negative-load-multiplier\/\" \/>\n\t<meta name=\"generator\" content=\"All in One SEO (AIOSEO) 4.9.10\" \/>\n\t\t<meta property=\"og:locale\" content=\"en_US\" \/>\n\t\t<meta property=\"og:site_name\" content=\"Ansys Learning Forum | Ansys Innovation Space\" \/>\n\t\t<meta property=\"og:type\" content=\"article\" \/>\n\t\t<meta property=\"og:title\" content=\"Linear buckling (negative load multiplier) | Ansys Learning Forum\" \/>\n\t\t<meta property=\"og:description\" content=\"Hello ! I am working on the buckling of a structure loaded with hydrostatic pressure (see picture). The structure is composed of shell elements. When I plot all the modes, I have negative load multipliers for every modes. I have read that negative load multiplier significate that the reverse applied load would create buckling in\" \/>\n\t\t<meta property=\"og:url\" content=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/linear-buckling-negative-load-multiplier\/\" \/>\n\t\t<meta property=\"og:image\" content=\"https:\/\/us.v-cdn.net\/6032193\/uploads\/attachments\/84184e92-c953-419c-8797-ab7400811e09\/b6b3478e-2b6d-44da-a5b7-ab740084ba45_capture.jpg?width=690&#038;upscale=false\" \/>\n\t\t<meta property=\"og:image:secure_url\" content=\"https:\/\/us.v-cdn.net\/6032193\/uploads\/attachments\/84184e92-c953-419c-8797-ab7400811e09\/b6b3478e-2b6d-44da-a5b7-ab740084ba45_capture.jpg?width=690&#038;upscale=false\" \/>\n\t\t<meta property=\"article:published_time\" content=\"2020-03-04T08:14:40+00:00\" \/>\n\t\t<meta property=\"article:modified_time\" content=\"2020-03-04T08:14:40+00:00\" \/>\n\t\t<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n\t\t<meta name=\"twitter:title\" content=\"Linear buckling (negative load multiplier) | Ansys Learning Forum\" \/>\n\t\t<meta name=\"twitter:description\" content=\"Hello ! I am working on the buckling of a structure loaded with hydrostatic pressure (see picture). The structure is composed of shell elements. When I plot all the modes, I have negative load multipliers for every modes. I have read that negative load multiplier significate that the reverse applied load would create buckling in\" \/>\n\t\t<meta name=\"twitter:image\" content=\"https:\/\/us.v-cdn.net\/6032193\/uploads\/attachments\/84184e92-c953-419c-8797-ab7400811e09\/b6b3478e-2b6d-44da-a5b7-ab740084ba45_capture.jpg?width=690&amp;upscale=false\" \/>\n\t\t<script type=\"application\/ld+json\" class=\"aioseo-schema\">\n\t\t\t{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic\\\/linear-buckling-negative-load-multiplier\\\/#breadcrumblist\",\"itemListElement\":[{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum#listItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\",\"nextItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/topics\\\/#listItem\",\"name\":\"Topics\"}},{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/topics\\\/#listItem\",\"position\":2,\"name\":\"Topics\",\"item\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/topics\\\/\",\"nextItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic\\\/linear-buckling-negative-load-multiplier\\\/#listItem\",\"name\":\"Linear buckling (negative load multiplier)\"},\"previousItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum#listItem\",\"name\":\"Home\"}},{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic\\\/linear-buckling-negative-load-multiplier\\\/#listItem\",\"position\":3,\"name\":\"Linear buckling (negative load multiplier)\",\"previousItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/topics\\\/#listItem\",\"name\":\"Topics\"}}]},{\"@type\":\"Organization\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/#organization\",\"name\":\"Ansys Learning Forum\",\"description\":\"Ansys Innovation Space\",\"url\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic\\\/linear-buckling-negative-load-multiplier\\\/#webpage\",\"url\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic\\\/linear-buckling-negative-load-multiplier\\\/\",\"name\":\"Linear buckling (negative load multiplier) | Ansys Learning Forum\",\"description\":\"Hello ! I am working on the buckling of a structure loaded with hydrostatic pressure (see picture). The structure is composed of shell elements. When I plot all the modes, I have negative load multipliers for every modes. I have read that negative load multiplier significate that the reverse applied load would create buckling in\",\"inLanguage\":\"en-US\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/#website\"},\"breadcrumb\":{\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic\\\/linear-buckling-negative-load-multiplier\\\/#breadcrumblist\"},\"datePublished\":\"2020-03-04T08:14:40+00:00\",\"dateModified\":\"2020-03-04T08:14:40+00:00\"},{\"@type\":\"WebSite\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/#website\",\"url\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/\",\"name\":\"Ansys Learning Forum\",\"description\":\"Ansys Innovation Space\",\"inLanguage\":\"en-US\",\"publisher\":{\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/#organization\"}}]}\n\t\t<\/script>\n\t\t<!-- All in One SEO -->\n\n","aioseo_head_json":{"title":"Linear buckling (negative load multiplier) | Ansys Learning Forum","description":"Hello ! I am working on the buckling of a structure loaded with hydrostatic pressure (see picture). The structure is composed of shell elements. When I plot all the modes, I have negative load multipliers for every modes. 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I am working on the buckling of a structure loaded with hydrostatic pressure (see picture). The structure is composed of shell elements. When I plot all the modes, I have negative load multipliers for every modes. 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I am working on the buckling of a structure loaded with hydrostatic pressure (see picture). The structure is composed of shell elements. When I plot all the modes, I have negative load multipliers for every modes. 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