Derivation of knockdown factors for grid-stiffened cylinders considering various shell thickness ratios
PurposeThe purpose of this paper is to derive knockdown factor functions in terms of a shell thickness ratio (i.e. the ratio of radius to thickness) for conventional orthogrid and hybrid-grid stiffened cylinders for the lightweight design of space launch vehicles. Design/methodology/approachThe shel...
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| Veröffentlicht in: | Aircraft engineering 2019-11, Vol.91 (10), p.1314-1326 |
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| creator | Sim, Chang-Hoon Kim, Han-Il Park, Jae-Sang Lee, Keejoo |
| description | PurposeThe purpose of this paper is to derive knockdown factor functions in terms of a shell thickness ratio (i.e. the ratio of radius to thickness) for conventional orthogrid and hybrid-grid stiffened cylinders for the lightweight design of space launch vehicles.
Design/methodology/approachThe shell knockdown factors of grid-stiffened cylinders under axial compressive loads are derived numerically considering various shell thickness ratios. Two grid systems using stiffeners – conventional orthogrid and hybrid-grid systems – are used for the grid-stiffened cylinders. The hybrid-grid stiffened cylinder uses major and minor stiffeners having two different cross-sectional areas. For modeling grid-stiffened cylinders with various thickness ratios, the effective thickness (teff) of the cylinders is kept constant, and the radius of the cylinder is varied. Thickness ratios of 100, 192 and 300 are considered for the orthogrid stiffened cylinder, and 100, 160, 200 and 300 for the hybrid-grid stiffened cylinder. Postbuckling analyses of grid-stiffened cylinders are conducted using a commercial nonlinear finite element analysis code, ABAQUS, to derive the shell knockdown factor. The single perturbation load approach is applied to represent the geometrical initial imperfection of a cylinder. Knockdown factors are derived for both the conventional orthogrid and hybrid-grid stiffened cylinders for different shell thickness ratios. Knockdown factor functions in terms of shell thickness ratio are obtained by curve fitting with the derived shell knockdown factors for the two grid-stiffened cylinders.
FindingsFor the two grid-stiffened cylinders, the derived shell knockdown factors are all higher than the previous NASA’s shell knockdown factors for various shell thickness ratios, ranging from 100 to 400. Therefore, the shell knockdown factors derived in this study may facilitate in the development of lightweight structures of space launch vehicles from the aspect of buckling design. For different shell thickness ratios of up to 500, the knockdown factor of the hybrid-grid stiffened cylinder is higher than that of the conventional orthogrid stiffened cylinder. Therefore, it is concluded that the hybrid-grid stiffened cylinder is more efficient than the conventional orthogrid-stiffened cylinder from the perspective of buckling design.
Practical implicationsThe obtained knockdown factor functions may provide the design criteria for lightweight cylindrical structures of space l |
| doi_str_mv | 10.1108/AEAT-11-2018-0272 |
| format | Article |
| fullrecord | <record><control><sourceid>proquest_emera</sourceid><recordid>TN_cdi_proquest_journals_2307086510</recordid><sourceformat>XML</sourceformat><sourcesystem>PC</sourcesystem><sourcerecordid>2307086510</sourcerecordid><originalsourceid>FETCH-LOGICAL-c314t-31ca059da66c3723ce3e513c97595dd889001f6a0dfdc2edf05f20d61da78dd73</originalsourceid><addsrcrecordid>eNptkU1LAzEQhoMoWKs_wFvAc3SSbHbTY6n1Awpe6jmEfLRpt0lNtpX-e3epF8HTvDDvOzM8g9A9hUdKQT5N59MloZQwoJIAa9gFGtFGSFIxyi8HXUkiZcWu0U0pGwBaC-AjtHp2ORx1F1LEyeNtTGZr03fEXpsu5YJ9yniVgyWlC9676Cw2pzZE6_qmSbGEXoW4wkedQzoUXNaubXG3DmYbXSk4D8PLLbryui3u7reO0efLfDl7I4uP1_fZdEEMp1VHODUaxMTquja8Ydw47gTlZtKIibBWykl_ua81WG8Nc9aD8AxsTa1upLUNH6OH89x9Tl8HVzq1SYcc-5WKcWhA1oJC76Jnl8mplOy82uew0_mkKKiBpxp49koNPNXAs8_AOeN2LuvW_hv58wL-AwDPeQM</addsrcrecordid><sourcetype>Aggregation Database</sourcetype><iscdi>true</iscdi><recordtype>article</recordtype><pqid>2307086510</pqid></control><display><type>article</type><title>Derivation of knockdown factors for grid-stiffened cylinders considering various shell thickness ratios</title><source>Emerald Complete Journals</source><creator>Sim, Chang-Hoon ; Kim, Han-Il ; Park, Jae-Sang ; Lee, Keejoo</creator><creatorcontrib>Sim, Chang-Hoon ; Kim, Han-Il ; Park, Jae-Sang ; Lee, Keejoo</creatorcontrib><description>PurposeThe purpose of this paper is to derive knockdown factor functions in terms of a shell thickness ratio (i.e. the ratio of radius to thickness) for conventional orthogrid and hybrid-grid stiffened cylinders for the lightweight design of space launch vehicles.
Design/methodology/approachThe shell knockdown factors of grid-stiffened cylinders under axial compressive loads are derived numerically considering various shell thickness ratios. Two grid systems using stiffeners – conventional orthogrid and hybrid-grid systems – are used for the grid-stiffened cylinders. The hybrid-grid stiffened cylinder uses major and minor stiffeners having two different cross-sectional areas. For modeling grid-stiffened cylinders with various thickness ratios, the effective thickness (teff) of the cylinders is kept constant, and the radius of the cylinder is varied. Thickness ratios of 100, 192 and 300 are considered for the orthogrid stiffened cylinder, and 100, 160, 200 and 300 for the hybrid-grid stiffened cylinder. Postbuckling analyses of grid-stiffened cylinders are conducted using a commercial nonlinear finite element analysis code, ABAQUS, to derive the shell knockdown factor. The single perturbation load approach is applied to represent the geometrical initial imperfection of a cylinder. Knockdown factors are derived for both the conventional orthogrid and hybrid-grid stiffened cylinders for different shell thickness ratios. Knockdown factor functions in terms of shell thickness ratio are obtained by curve fitting with the derived shell knockdown factors for the two grid-stiffened cylinders.
FindingsFor the two grid-stiffened cylinders, the derived shell knockdown factors are all higher than the previous NASA’s shell knockdown factors for various shell thickness ratios, ranging from 100 to 400. Therefore, the shell knockdown factors derived in this study may facilitate in the development of lightweight structures of space launch vehicles from the aspect of buckling design. For different shell thickness ratios of up to 500, the knockdown factor of the hybrid-grid stiffened cylinder is higher than that of the conventional orthogrid stiffened cylinder. Therefore, it is concluded that the hybrid-grid stiffened cylinder is more efficient than the conventional orthogrid-stiffened cylinder from the perspective of buckling design.
Practical implicationsThe obtained knockdown factor functions may provide the design criteria for lightweight cylindrical structures of space launch vehicles.
Originality/valueDerivation of shell knockdown factors of hybrid-grid stiffened cylinders considering various shell thickness ratios is attempted for the first time in this study.</description><identifier>ISSN: 1748-8842</identifier><identifier>EISSN: 1758-4213</identifier><identifier>DOI: 10.1108/AEAT-11-2018-0272</identifier><language>eng</language><publisher>Bradford: Emerald Publishing Limited</publisher><subject>Buckling ; Computer simulation ; Curve fitting ; Cylinders ; Derivation ; Design optimization ; Finite element method ; Hybrid systems ; Launch vehicles ; Lightweight ; Load ; Mathematical analysis ; Mathematical models ; Nonlinear analysis ; Perturbation ; Postbuckling ; Ratios ; Rockets ; Stiffeners ; Thickness ratio ; Vehicles</subject><ispartof>Aircraft engineering, 2019-11, Vol.91 (10), p.1314-1326</ispartof><rights>Emerald Publishing Limited</rights><rights>Emerald Publishing Limited 2019</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c314t-31ca059da66c3723ce3e513c97595dd889001f6a0dfdc2edf05f20d61da78dd73</citedby><cites>FETCH-LOGICAL-c314t-31ca059da66c3723ce3e513c97595dd889001f6a0dfdc2edf05f20d61da78dd73</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,776,780,961,27901,27902</link.rule.ids></links><search><creatorcontrib>Sim, Chang-Hoon</creatorcontrib><creatorcontrib>Kim, Han-Il</creatorcontrib><creatorcontrib>Park, Jae-Sang</creatorcontrib><creatorcontrib>Lee, Keejoo</creatorcontrib><title>Derivation of knockdown factors for grid-stiffened cylinders considering various shell thickness ratios</title><title>Aircraft engineering</title><description>PurposeThe purpose of this paper is to derive knockdown factor functions in terms of a shell thickness ratio (i.e. the ratio of radius to thickness) for conventional orthogrid and hybrid-grid stiffened cylinders for the lightweight design of space launch vehicles.
Design/methodology/approachThe shell knockdown factors of grid-stiffened cylinders under axial compressive loads are derived numerically considering various shell thickness ratios. Two grid systems using stiffeners – conventional orthogrid and hybrid-grid systems – are used for the grid-stiffened cylinders. The hybrid-grid stiffened cylinder uses major and minor stiffeners having two different cross-sectional areas. For modeling grid-stiffened cylinders with various thickness ratios, the effective thickness (teff) of the cylinders is kept constant, and the radius of the cylinder is varied. Thickness ratios of 100, 192 and 300 are considered for the orthogrid stiffened cylinder, and 100, 160, 200 and 300 for the hybrid-grid stiffened cylinder. Postbuckling analyses of grid-stiffened cylinders are conducted using a commercial nonlinear finite element analysis code, ABAQUS, to derive the shell knockdown factor. The single perturbation load approach is applied to represent the geometrical initial imperfection of a cylinder. Knockdown factors are derived for both the conventional orthogrid and hybrid-grid stiffened cylinders for different shell thickness ratios. Knockdown factor functions in terms of shell thickness ratio are obtained by curve fitting with the derived shell knockdown factors for the two grid-stiffened cylinders.
FindingsFor the two grid-stiffened cylinders, the derived shell knockdown factors are all higher than the previous NASA’s shell knockdown factors for various shell thickness ratios, ranging from 100 to 400. Therefore, the shell knockdown factors derived in this study may facilitate in the development of lightweight structures of space launch vehicles from the aspect of buckling design. For different shell thickness ratios of up to 500, the knockdown factor of the hybrid-grid stiffened cylinder is higher than that of the conventional orthogrid stiffened cylinder. Therefore, it is concluded that the hybrid-grid stiffened cylinder is more efficient than the conventional orthogrid-stiffened cylinder from the perspective of buckling design.
Practical implicationsThe obtained knockdown factor functions may provide the design criteria for lightweight cylindrical structures of space launch vehicles.
Originality/valueDerivation of shell knockdown factors of hybrid-grid stiffened cylinders considering various shell thickness ratios is attempted for the first time in this study.</description><subject>Buckling</subject><subject>Computer simulation</subject><subject>Curve fitting</subject><subject>Cylinders</subject><subject>Derivation</subject><subject>Design optimization</subject><subject>Finite element method</subject><subject>Hybrid systems</subject><subject>Launch vehicles</subject><subject>Lightweight</subject><subject>Load</subject><subject>Mathematical analysis</subject><subject>Mathematical models</subject><subject>Nonlinear analysis</subject><subject>Perturbation</subject><subject>Postbuckling</subject><subject>Ratios</subject><subject>Rockets</subject><subject>Stiffeners</subject><subject>Thickness ratio</subject><subject>Vehicles</subject><issn>1748-8842</issn><issn>1758-4213</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2019</creationdate><recordtype>article</recordtype><sourceid>BENPR</sourceid><recordid>eNptkU1LAzEQhoMoWKs_wFvAc3SSbHbTY6n1Awpe6jmEfLRpt0lNtpX-e3epF8HTvDDvOzM8g9A9hUdKQT5N59MloZQwoJIAa9gFGtFGSFIxyi8HXUkiZcWu0U0pGwBaC-AjtHp2ORx1F1LEyeNtTGZr03fEXpsu5YJ9yniVgyWlC9676Cw2pzZE6_qmSbGEXoW4wkedQzoUXNaubXG3DmYbXSk4D8PLLbryui3u7reO0efLfDl7I4uP1_fZdEEMp1VHODUaxMTquja8Ydw47gTlZtKIibBWykl_ua81WG8Nc9aD8AxsTa1upLUNH6OH89x9Tl8HVzq1SYcc-5WKcWhA1oJC76Jnl8mplOy82uew0_mkKKiBpxp49koNPNXAs8_AOeN2LuvW_hv58wL-AwDPeQM</recordid><startdate>20191104</startdate><enddate>20191104</enddate><creator>Sim, Chang-Hoon</creator><creator>Kim, Han-Il</creator><creator>Park, Jae-Sang</creator><creator>Lee, Keejoo</creator><general>Emerald Publishing Limited</general><general>Emerald Group Publishing Limited</general><scope>AAYXX</scope><scope>CITATION</scope><scope>7RQ</scope><scope>7TB</scope><scope>7WY</scope><scope>7XB</scope><scope>8AF</scope><scope>8FD</scope><scope>8FE</scope><scope>8FG</scope><scope>ABJCF</scope><scope>AFKRA</scope><scope>ARAPS</scope><scope>AZQEC</scope><scope>BENPR</scope><scope>BEZIV</scope><scope>BGLVJ</scope><scope>CCPQU</scope><scope>D1I</scope><scope>DWQXO</scope><scope>F28</scope><scope>FR3</scope><scope>GNUQQ</scope><scope>H8D</scope><scope>HCIFZ</scope><scope>K6~</scope><scope>KB.</scope><scope>L.-</scope><scope>L6V</scope><scope>L7M</scope><scope>M0F</scope><scope>M1Q</scope><scope>M2P</scope><scope>M7S</scope><scope>P5Z</scope><scope>P62</scope><scope>PDBOC</scope><scope>PQBIZ</scope><scope>PQEST</scope><scope>PQQKQ</scope><scope>PQUKI</scope><scope>PTHSS</scope><scope>Q9U</scope></search><sort><creationdate>20191104</creationdate><title>Derivation of knockdown factors for grid-stiffened cylinders considering various shell thickness ratios</title><author>Sim, Chang-Hoon ; Kim, Han-Il ; Park, Jae-Sang ; Lee, Keejoo</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c314t-31ca059da66c3723ce3e513c97595dd889001f6a0dfdc2edf05f20d61da78dd73</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2019</creationdate><topic>Buckling</topic><topic>Computer simulation</topic><topic>Curve fitting</topic><topic>Cylinders</topic><topic>Derivation</topic><topic>Design optimization</topic><topic>Finite element method</topic><topic>Hybrid systems</topic><topic>Launch vehicles</topic><topic>Lightweight</topic><topic>Load</topic><topic>Mathematical analysis</topic><topic>Mathematical models</topic><topic>Nonlinear analysis</topic><topic>Perturbation</topic><topic>Postbuckling</topic><topic>Ratios</topic><topic>Rockets</topic><topic>Stiffeners</topic><topic>Thickness ratio</topic><topic>Vehicles</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Sim, Chang-Hoon</creatorcontrib><creatorcontrib>Kim, Han-Il</creatorcontrib><creatorcontrib>Park, Jae-Sang</creatorcontrib><creatorcontrib>Lee, Keejoo</creatorcontrib><collection>CrossRef</collection><collection>Career & Technical Education Database</collection><collection>Mechanical & Transportation Engineering Abstracts</collection><collection>ABI/INFORM Collection</collection><collection>ProQuest Central (purchase pre-March 2016)</collection><collection>STEM Database</collection><collection>Technology Research Database</collection><collection>ProQuest SciTech Collection</collection><collection>ProQuest Technology Collection</collection><collection>Materials Science & Engineering Collection</collection><collection>ProQuest Central UK/Ireland</collection><collection>Advanced Technologies & Aerospace Collection</collection><collection>ProQuest Central Essentials</collection><collection>ProQuest Central</collection><collection>Business Premium Collection</collection><collection>Technology Collection</collection><collection>ProQuest One Community College</collection><collection>ProQuest Materials Science Collection</collection><collection>ProQuest Central Korea</collection><collection>ANTE: Abstracts in New Technology & Engineering</collection><collection>Engineering Research Database</collection><collection>ProQuest Central Student</collection><collection>Aerospace Database</collection><collection>SciTech Premium Collection</collection><collection>ProQuest Business Collection</collection><collection>Materials Science Database</collection><collection>ABI/INFORM Professional Advanced</collection><collection>ProQuest Engineering Collection</collection><collection>Advanced Technologies Database with Aerospace</collection><collection>ABI/INFORM Trade & Industry</collection><collection>Military Database</collection><collection>Science Database</collection><collection>Engineering Database</collection><collection>Advanced Technologies & Aerospace Database</collection><collection>ProQuest Advanced Technologies & Aerospace Collection</collection><collection>Materials Science Collection</collection><collection>One Business (ProQuest)</collection><collection>ProQuest One Academic Eastern Edition (DO NOT USE)</collection><collection>ProQuest One Academic</collection><collection>ProQuest One Academic UKI Edition</collection><collection>Engineering Collection</collection><collection>ProQuest Central Basic</collection><jtitle>Aircraft engineering</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Sim, Chang-Hoon</au><au>Kim, Han-Il</au><au>Park, Jae-Sang</au><au>Lee, Keejoo</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Derivation of knockdown factors for grid-stiffened cylinders considering various shell thickness ratios</atitle><jtitle>Aircraft engineering</jtitle><date>2019-11-04</date><risdate>2019</risdate><volume>91</volume><issue>10</issue><spage>1314</spage><epage>1326</epage><pages>1314-1326</pages><issn>1748-8842</issn><eissn>1758-4213</eissn><abstract>PurposeThe purpose of this paper is to derive knockdown factor functions in terms of a shell thickness ratio (i.e. the ratio of radius to thickness) for conventional orthogrid and hybrid-grid stiffened cylinders for the lightweight design of space launch vehicles.
Design/methodology/approachThe shell knockdown factors of grid-stiffened cylinders under axial compressive loads are derived numerically considering various shell thickness ratios. Two grid systems using stiffeners – conventional orthogrid and hybrid-grid systems – are used for the grid-stiffened cylinders. The hybrid-grid stiffened cylinder uses major and minor stiffeners having two different cross-sectional areas. For modeling grid-stiffened cylinders with various thickness ratios, the effective thickness (teff) of the cylinders is kept constant, and the radius of the cylinder is varied. Thickness ratios of 100, 192 and 300 are considered for the orthogrid stiffened cylinder, and 100, 160, 200 and 300 for the hybrid-grid stiffened cylinder. Postbuckling analyses of grid-stiffened cylinders are conducted using a commercial nonlinear finite element analysis code, ABAQUS, to derive the shell knockdown factor. The single perturbation load approach is applied to represent the geometrical initial imperfection of a cylinder. Knockdown factors are derived for both the conventional orthogrid and hybrid-grid stiffened cylinders for different shell thickness ratios. Knockdown factor functions in terms of shell thickness ratio are obtained by curve fitting with the derived shell knockdown factors for the two grid-stiffened cylinders.
FindingsFor the two grid-stiffened cylinders, the derived shell knockdown factors are all higher than the previous NASA’s shell knockdown factors for various shell thickness ratios, ranging from 100 to 400. Therefore, the shell knockdown factors derived in this study may facilitate in the development of lightweight structures of space launch vehicles from the aspect of buckling design. For different shell thickness ratios of up to 500, the knockdown factor of the hybrid-grid stiffened cylinder is higher than that of the conventional orthogrid stiffened cylinder. Therefore, it is concluded that the hybrid-grid stiffened cylinder is more efficient than the conventional orthogrid-stiffened cylinder from the perspective of buckling design.
Practical implicationsThe obtained knockdown factor functions may provide the design criteria for lightweight cylindrical structures of space launch vehicles.
Originality/valueDerivation of shell knockdown factors of hybrid-grid stiffened cylinders considering various shell thickness ratios is attempted for the first time in this study.</abstract><cop>Bradford</cop><pub>Emerald Publishing Limited</pub><doi>10.1108/AEAT-11-2018-0272</doi><tpages>13</tpages></addata></record> |
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| source | Emerald Complete Journals |
| subjects | Buckling Computer simulation Curve fitting Cylinders Derivation Design optimization Finite element method Hybrid systems Launch vehicles Lightweight Load Mathematical analysis Mathematical models Nonlinear analysis Perturbation Postbuckling Ratios Rockets Stiffeners Thickness ratio Vehicles |
| title | Derivation of knockdown factors for grid-stiffened cylinders considering various shell thickness ratios |
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