{"corpus_id":146447714,"paper_sha":"ed3d41b5a95ddf48032c2739c823f313eafe6eb1","doi":"10.1016/J.IJMECSCI.2019.04.032","arxiv_id":null,"pmid":null,"pmcid":null,"mag_id":2939106707,"dblp_id":null,"acl_id":null,"title":"Energy absorption of thin-walled square tubes designed by kirigami approach","year":2019,"publication_date":"2019-07-01","venue":"International Journal of Mechanical Sciences","journal":{"name":"International Journal of Mechanical Sciences","pages":null,"volume":null},"journal_issn":null,"journal_title":null,"publication_types":[],"pubmed_pub_types":null,"s2_fields_of_study":["Materials Science","Engineering"],"reference_count":45,"citation_count":88,"influential_citation_count":0,"is_open_access":false,"arxiv_categories":null,"arxiv_license":null,"arxiv_journal_ref":null,"mesh_headings":null,"chemicals":null,"comments_corrections":null,"source_flags":1,"s2_open_access_pdf_url":null,"s2_open_access_landing_url":null,"s2_open_access_license":null,"s2_open_access_status":null,"pmc_open_access_pdf_url":null,"pmc_open_access_landing_url":null,"pmc_open_access_license":null,"pmc_open_access_status":null,"unpaywall_open_access_pdf_url":null,"unpaywall_open_access_landing_url":null,"unpaywall_open_access_license":null,"unpaywall_open_access_status":null,"abstract":"Abstract Thin-walled tubes are extensively employed as energy absorption devices. The extensional mode (EM) of collapse in thin-walled square tube is desirable in terms of energy absorption while facing impact loading. In this paper, a novel tube known as the kirigami crash box (KCB) that is designed by kirigami approach, is proposed to improve the crashworthiness of the tubular structures by collapsing in EM. The experimental and numerical results show that kirigami pattern in KCB serves as both geometric imperfection to reduce the initial peak force Fmax and mode inducer to trigger the desired EM while collapsing. Numerical simulation indicates that the ideal EM is successfully triggered with a 39.7% reduction of initial peak force Fmax and 33.9% increase of mean crushing force Fm comparing to conventional square tube (N-CST). Parametric study shows that the collapse mode of KCBs deformed in EM is independent of aspect ratio b/t within the range of b/t ≤ 81.3, while for CST, the corresponding range is b/t ≤ 7.5. KCB inclines to collapse in EM when the dihedral angle θ or the number of modules M decrease. The Fmax, Fm and CFEs of KCBs with identical M increase with the increasing θ. Whereas, the effect of M on energy absorption is relatively less important while θ remains the same. Moreover, the superiority of energy absorption for KCB subjected to dynamic loading is more significant comparing to quasi-static axial crushing.","claims":[{"public_id":"cl_a67968a86e20c3d8539fc0e9b3d6dca8","status":"active","text":"Decreasing the dihedral angle θ or the number of modules M makes kirigami crash boxes more likely to collapse in extensional mode, while larger θ increases the initial peak force, mean crushing force, and crushing force efficiency for designs with the same M.","confidence":0.92,"contributors":[{"id":1,"public_id":"12632b8b5f","public_label":"Anonymous (12632b8b5f)","roles":["extraction"],"url":"https://sah.borca.ai/u/12632b8b5f"}],"url":"https://sah.borca.ai/claims/cl_a67968a86e20c3d8539fc0e9b3d6dca8"},{"public_id":"cl_fecafecd0937b537178e59d4e0ae75c8","status":"active","text":"Energy-absorption superiority under dynamic loading is more pronounced than under quasi-static axial crushing for the kirigami crash box.","confidence":0.9,"contributors":[{"id":1,"public_id":"12632b8b5f","public_label":"Anonymous (12632b8b5f)","roles":["extraction"],"url":"https://sah.borca.ai/u/12632b8b5f"}],"url":"https://sah.borca.ai/claims/cl_fecafecd0937b537178e59d4e0ae75c8"},{"public_id":"cl_c950b033e44a45e51c287d7b9a77ea69","status":"active","text":"For kirigami crash boxes, extensional-mode collapse is independent of aspect ratio b/t up to 81.3, whereas conventional square tubes require b/t at most 7.5 to deform in extensional mode.","confidence":0.94,"contributors":[{"id":1,"public_id":"12632b8b5f","public_label":"Anonymous (12632b8b5f)","roles":["extraction"],"url":"https://sah.borca.ai/u/12632b8b5f"}],"url":"https://sah.borca.ai/claims/cl_c950b033e44a45e51c287d7b9a77ea69"},{"public_id":"cl_8af3489e5b32c0456566ab4bab1470cd","status":"active","text":"The kirigami crash box triggers extensional-mode collapse, reducing the initial peak force by 39.7% and increasing the mean crushing force by 33.9% relative to the conventional square tube.","confidence":0.98,"contributors":[{"id":1,"public_id":"12632b8b5f","public_label":"Anonymous (12632b8b5f)","roles":["extraction"],"url":"https://sah.borca.ai/u/12632b8b5f"}],"url":"https://sah.borca.ai/claims/cl_8af3489e5b32c0456566ab4bab1470cd"},{"public_id":"cl_2a79257692d489c204cf68d8ba210204","status":"active","text":"The kirigami pattern acts as both a geometric imperfection that lowers the initial peak force and a mode inducer that promotes the desired extensional-mode collapse.","confidence":0.95,"contributors":[{"id":1,"public_id":"12632b8b5f","public_label":"Anonymous (12632b8b5f)","roles":["extraction"],"url":"https://sah.borca.ai/u/12632b8b5f"}],"url":"https://sah.borca.ai/claims/cl_2a79257692d489c204cf68d8ba210204"}],"concepts":[{"public_id":"co_0655c658b81397112fa86c79c93aee84","status":"active","name":"energy absorption","description":"The capacity of a structure to dissipate impact energy during crushing.","types":["mechanical 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