#101: How to determine tension\/compression for a CBUSH between coincident nodes?<\/p>\n
For the CBUSH element, when connecting coincident grids, the ‘state’ of the element, as far as tension\/compression can be confusing, since you cannot rely on the sign of the force. In other words, tension isn’t always positive and compression isn’t always negative.<\/p>\n","protected":false},"excerpt":{"rendered":"
#101: How to determine tension\/compression for a CBUSH between coincident nodes? For the CBUSH element, when connecting coincident grids, the ‘state’ of the element, as far as tension\/compression can be confusing, since you cannot rely on the sign of the force. In other words, tension isn’t always positive and compression isn’t always negative.<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"nf_dc_page":"","_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":"","_lmt_disableupdate":"yes","_lmt_disable":"","jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[22],"tags":[],"class_list":["post-640","post","type-post","status-publish","format-standard","hentry","category-nastran"],"modified_by":"gantovnik","jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/p8bH0k-ak","jetpack_likes_enabled":true,"jetpack-related-posts":[{"id":1466,"url":"https:\/\/gantovnik.com\/bio-tips\/2022\/05\/210-parametric-curve-in-3d-2-2-2-2-2-2-2-2-2-2-2-2-2-3-2-2-2-2-2-2-2-2-2-3-2-2-2-2-2-2-2\/","url_meta":{"origin":640,"position":0},"title":"#283 Move node to the location of the other node to create coincident nodes in HyperMesh","author":"gantovnik","date":"2022-05-29","format":false,"excerpt":"Sometimes, we need to create coincident nodes for CBUSH elements. It is possible to move nodes using the translate function in the menu Tool\/translate\/node Initially, we have two nodes, and we want to move node 1 to the position of node 2. I will\u2026","rel":"","context":"In "HyperMesh"","block_context":{"text":"HyperMesh","link":"https:\/\/gantovnik.com\/bio-tips\/category\/hypermesh\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/gantovnik.com\/bio-tips\/wp-content\/uploads\/2022\/05\/2022-05-29_223140.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/gantovnik.com\/bio-tips\/wp-content\/uploads\/2022\/05\/2022-05-29_223140.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/gantovnik.com\/bio-tips\/wp-content\/uploads\/2022\/05\/2022-05-29_223140.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/gantovnik.com\/bio-tips\/wp-content\/uploads\/2022\/05\/2022-05-29_223140.jpg?resize=700%2C400&ssl=1 2x"},"classes":[]},{"id":10486,"url":"https:\/\/gantovnik.com\/bio-tips\/2025\/09\/464-difference-between-cbush-and-cbush1d-in-hypermesh\/","url_meta":{"origin":640,"position":1},"title":"#464 Difference Between CBUSH and CBUSH1D in HyperMesh","author":"gantovnik","date":"2025-09-30","format":false,"excerpt":"When working with connectors in HyperMesh \/ Nastran, you will often see two element types: CBUSH and CBUSH1D. While they sound similar, they serve slightly different purposes. CBUSH (General-Purpose Bushing Element) Type: 2-node element, each node has 6 DOF (12 total). Flexibility: Allows stiffness definition in all 6 directions (translation\u2026","rel":"","context":"In "HyperMesh"","block_context":{"text":"HyperMesh","link":"https:\/\/gantovnik.com\/bio-tips\/category\/hypermesh\/"},"img":{"alt_text":"Generated image","src":"https:\/\/sdmntpraustraliaeast.oaiusercontent.com\/files\/00000000-ebfc-61fa-8b58-b37a4b4c018b\/raw?se=2025-09-30T21%3A33%3A03Z&sp=r&sv=2024-08-04&sr=b&scid=fa3459b1-8b6d-5d9f-afff-30ef6a559619&skoid=8cb40e9f-389f-4cf6-afaa-e5bd4c7fd98c&sktid=a48cca56-e6da-484e-a814-9c849652bcb3&skt=2025-09-29T23%3A21%3A56Z&ske=2025-09-30T23%3A21%3A56Z&sks=b&skv=2024-08-04&sig=zsfkgTujIKv1NO97C10CMa7N1D5tSM2AO403bHULAqg%3D","width":350,"height":200,"srcset":"https:\/\/sdmntpraustraliaeast.oaiusercontent.com\/files\/00000000-ebfc-61fa-8b58-b37a4b4c018b\/raw?se=2025-09-30T21%3A33%3A03Z&sp=r&sv=2024-08-04&sr=b&scid=fa3459b1-8b6d-5d9f-afff-30ef6a559619&skoid=8cb40e9f-389f-4cf6-afaa-e5bd4c7fd98c&sktid=a48cca56-e6da-484e-a814-9c849652bcb3&skt=2025-09-29T23%3A21%3A56Z&ske=2025-09-30T23%3A21%3A56Z&sks=b&skv=2024-08-04&sig=zsfkgTujIKv1NO97C10CMa7N1D5tSM2AO403bHULAqg%3D 1x, https:\/\/sdmntpraustraliaeast.oaiusercontent.com\/files\/00000000-ebfc-61fa-8b58-b37a4b4c018b\/raw?se=2025-09-30T21%3A33%3A03Z&sp=r&sv=2024-08-04&sr=b&scid=fa3459b1-8b6d-5d9f-afff-30ef6a559619&skoid=8cb40e9f-389f-4cf6-afaa-e5bd4c7fd98c&sktid=a48cca56-e6da-484e-a814-9c849652bcb3&skt=2025-09-29T23%3A21%3A56Z&ske=2025-09-30T23%3A21%3A56Z&sks=b&skv=2024-08-04&sig=zsfkgTujIKv1NO97C10CMa7N1D5tSM2AO403bHULAqg%3D 1.5x, https:\/\/sdmntpraustraliaeast.oaiusercontent.com\/files\/00000000-ebfc-61fa-8b58-b37a4b4c018b\/raw?se=2025-09-30T21%3A33%3A03Z&sp=r&sv=2024-08-04&sr=b&scid=fa3459b1-8b6d-5d9f-afff-30ef6a559619&skoid=8cb40e9f-389f-4cf6-afaa-e5bd4c7fd98c&sktid=a48cca56-e6da-484e-a814-9c849652bcb3&skt=2025-09-29T23%3A21%3A56Z&ske=2025-09-30T23%3A21%3A56Z&sks=b&skv=2024-08-04&sig=zsfkgTujIKv1NO97C10CMa7N1D5tSM2AO403bHULAqg%3D 2x"},"classes":[]},{"id":1460,"url":"https:\/\/gantovnik.com\/bio-tips\/2022\/05\/210-parametric-curve-in-3d-2-2-2-2-2-2-2-2-2-2-2-2-2-3-2-2-2-2-2-2-2-2-2-3-2-2-2-2-2-2\/","url_meta":{"origin":640,"position":2},"title":"#282 How to have mesh nodes at certain locations in HyperMesh?","author":"gantovnik","date":"2022-05-29","format":false,"excerpt":"Sometimes, we want to add points at specific locations to the mesh. For example, if we're going to create CBUSH elements. If we add mesh to the surface, points will not be in the mesh. But we can add points to the surface using: menu [Geom\/point edit] Then, if we\u2026","rel":"","context":"In "HyperMesh"","block_context":{"text":"HyperMesh","link":"https:\/\/gantovnik.com\/bio-tips\/category\/hypermesh\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/gantovnik.com\/bio-tips\/wp-content\/uploads\/2022\/05\/2022-05-29_020430.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/gantovnik.com\/bio-tips\/wp-content\/uploads\/2022\/05\/2022-05-29_020430.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/gantovnik.com\/bio-tips\/wp-content\/uploads\/2022\/05\/2022-05-29_020430.jpg?resize=525%2C300&ssl=1 1.5x"},"classes":[]},{"id":760,"url":"https:\/\/gantovnik.com\/bio-tips\/2020\/10\/127-create-rbe3-element-using-hypermesh-tcl\/","url_meta":{"origin":640,"position":3},"title":"#127 Create RBE3 element using tcl in HyperMesh","author":"gantovnik","date":"2020-10-29","format":false,"excerpt":"#127 Create RBE3 element using HyperMesh tcl To create an RBE3 element with dependent node 100 and independent nodes 101,102, and 103 with all of the nodes having all six degrees of freedom and a weight of 1.23 *rbe3 mark_id independent_dofs dof_size independent_weights weight_size dependent_node dof weight mark_id: The ID\u2026","rel":"","context":"In "HyperMesh"","block_context":{"text":"HyperMesh","link":"https:\/\/gantovnik.com\/bio-tips\/category\/hypermesh\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":2124,"url":"https:\/\/gantovnik.com\/bio-tips\/2024\/02\/413-1d-elements-in-hypermesh\/","url_meta":{"origin":640,"position":4},"title":"#413 1D elements in HyperMesh","author":"gantovnik","date":"2024-02-05","format":false,"excerpt":"Bar elements: Bar2 = Configuration 60 (1st order) elements with 2 nodes used to model axial, bending, and torsion behavior. Bar2 elements have a property reference, an orientation vector, offset vectors and ends A and B, and pin flags at ends A and B. Bar3 = Configuration 63 - 1D\u2026","rel":"","context":"In "fem"","block_context":{"text":"fem","link":"https:\/\/gantovnik.com\/bio-tips\/category\/fem\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":673,"url":"https:\/\/gantovnik.com\/bio-tips\/2020\/09\/115-rbe3-vs-rbe2\/","url_meta":{"origin":640,"position":5},"title":"#115 Nastran Tips: When to Use RBE2 vs. RBE3 Elements","author":"gantovnik","date":"2020-09-28","format":false,"excerpt":"#115: RBE3 and RBE2 RBE2 (Rigid Body Element Type 2): Represents an infinitely stiff connection. All connected nodes (slave nodes) follow the exact same translations and rotations as the master node. There is no relative motion between the master and slave nodes. Commonly used for rigid body constraints, fixtures, or\u2026","rel":"","context":"In "nastran"","block_context":{"text":"nastran","link":"https:\/\/gantovnik.com\/bio-tips\/category\/nastran\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]}],"_links":{"self":[{"href":"https:\/\/gantovnik.com\/bio-tips\/wp-json\/wp\/v2\/posts\/640","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/gantovnik.com\/bio-tips\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/gantovnik.com\/bio-tips\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/gantovnik.com\/bio-tips\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/gantovnik.com\/bio-tips\/wp-json\/wp\/v2\/comments?post=640"}],"version-history":[{"count":0,"href":"https:\/\/gantovnik.com\/bio-tips\/wp-json\/wp\/v2\/posts\/640\/revisions"}],"wp:attachment":[{"href":"https:\/\/gantovnik.com\/bio-tips\/wp-json\/wp\/v2\/media?parent=640"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/gantovnik.com\/bio-tips\/wp-json\/wp\/v2\/categories?post=640"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/gantovnik.com\/bio-tips\/wp-json\/wp\/v2\/tags?post=640"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}