Frontiers in Aerospace Science

Volume: 1

Design Optimization of Variable Stiffness Composite Structures for Aerospace Applications

Author(s): Mohammad Rouhi, Hossein Ghayoor, Suong V. Hoa and Mehdi Hojjati

Pp: 515-541 (27)

DOI: 10.2174/9781681083056116010016

* (Excluding Mailing and Handling)

Abstract

Automated fiber placement (AFP) machines can steer the fibers/tows to make the so-called variable stiffness (VS) composites. They allow the designers to fully exploit the directional properties of composite materials to tailor the internal load distribution and improve the structural performance. VS composites have been shown to be very promising in the design optimization of composite panels and shells for buckling and post-buckling performance and consequently for further reducing the mass of future aerospace structures. In this chapter, the buckling performance improvement of VS composite cylinders with circular and elliptical cross sections is investigated. A metamodeling based design optimization (MBDO) method is presented to maximize the buckling performance of VS composite cylinders compared with their constant stiffness (CS) designs. The structural improvement mechanism via stiffness tailoring in a VS composite cylinder is also presented and discussed. The effects of different parameters including the cylinders’ aspect ratio and size as well as the percentage of the steered plies in the laminate are also investigated.


Keywords: Automated fiber placement, Buckling, Composite cylinder, Fiber steering, Optimization, Variable stiffness.

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      • 13. app/Models/UserAccess/UserAccess.php:1266
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      • 15. vendor/laravel/framework/src/Illuminate/Routing/Controller.php:54
      • 16. vendor/laravel/framework/src/Illuminate/Routing/ControllerDispatcher.php:43
      • 17. vendor/laravel/framework/src/Illuminate/Routing/Route.php:260
    • (select j.user_access_id,j.volume_id,j.user_id,j.from_ip,j.to_ip,j.type,j.track,"Trial Access" as access_base_text, CASE j.type WHEN 111 THEN true ELSE false END as terms_popup, "S" as content_download_type, null as restricted_user_access_key, null as restricted_user_access_type, CASE j.track WHEN 0 THEN false ELSE true END as tracksAccessByVolume,"chapter" as access_level, j.chapter_id from `user_access_chapter_trail` as `j` inner join `user_access_info` as `info` on `j`.`user_access_id` = `info`.`user_access_id` where ((j.from_ip <= 309791667 and j.to_ip >=309791667 )) and ((j.from_date <= 1740496325 and j.to_date >= 1740496325 and j.perpetual= 0) or (j.from_date is null and j.to_date is null and j.perpetual= 1)) and j.chapter_id = 9426) union (select j.user_access_id,j.volume_id,j.user_id,j.from_ip,j.to_ip,j.type,j.track,"Subscribed" as access_base_text, false as terms_popup, "S" as content_download_type, null as restricted_user_access_key, null as restricted_user_access_type, CASE j.track WHEN 0 THEN false ELSE true END as tracksAccessByVolume,"chapter" as access_level, j.chapter_id from `user_access_chapter_corporate` as `j` inner join `user_access_info` as `info` on `j`.`user_access_id` = `info`.`user_access_id` where ((j.from_ip <= 309791667 and j.to_ip >=309791667 )) and ((j.from_date <= 1740496325 and j.to_date >= 1740496325 and j.perpetual= 0) or (j.from_date is null and j.to_date is null and j.perpetual= 1)) and j.chapter_id = 9426) union (select j.user_access_id,j.volume_id,j.user_id,j.from_ip,j.to_ip,j.type,j.track,"Token Based Access" as access_base_text, false as terms_popup, "R" as content_download_type, j.uc_id as restricted_user_access_key, "v" as restricted_user_access_type, CASE j.track WHEN 0 THEN false ELSE true END as tracksAccessByVolume,"chapter" as access_level, j.chapter_id from `user_access_chapter_token` as `j` inner join `user_access_info` as `info` on `j`.`user_access_id` = `info`.`user_access_id` where ((j.from_ip <= 309791667 and j.to_ip >=309791667 )) and ((j.from_date <= 1740496325 and j.to_date >= 1740496325 and j.perpetual= 0) or (j.from_date is null and j.to_date is null and j.perpetual= 1)) and j.chapter_id = 9426)
      660μsalphaeurekaselec_live_10_06_2022UserAccess.php#1266
      Backtrace
      • 13. app/Models/UserAccess/UserAccess.php:1266
      • 14. app/Http/Controllers/ChapterController.php:1549
      • 15. vendor/laravel/framework/src/Illuminate/Routing/Controller.php:54
      • 16. vendor/laravel/framework/src/Illuminate/Routing/ControllerDispatcher.php:43
      • 17. vendor/laravel/framework/src/Illuminate/Routing/Route.php:260
    • select b.banner_link, b.banner_name, b.banner_script, b.banner_remarks, b.banner_file_name, b.banner_placement, bd.content_type, bd.content_id from `tbl_banner` as `b` inner join `tbl_banner_detail` as `bd` on `bd`.`banner_id` = `b`.`banner_id` inner join `users` as `u` on `u`.`id` = `b`.`updated_by` where `b`.`banner_ebook` = 1 and `bd`.`content_type` = 'B' and `bd`.`content_id` = 2011 and `b`.`banner_from_date` <= 1740496325 and `b`.`banner_to_date` >= 1740496325 and `b`.`banner_status` = 'A' order by `b`.`banner_id` desc
      1.07msalphaeurekaselec_live_10_06_2022Banner.php#95
      Bindings
      • 0: 1
      • 1: B
      • 2: 2011
      • 3: 1740496325
      • 4: 1740496325
      • 5: A
      Backtrace
      • 13. app/Models/Banner.php:95
      • 14. app/Http/helpers.php:404
      • 17. vendor/laravel/framework/src/Illuminate/Filesystem/Filesystem.php:124
      • 18. vendor/laravel/framework/src/Illuminate/View/Engines/PhpEngine.php:58
      • 19. vendor/laravel/framework/src/Illuminate/View/Engines/CompilerEngine.php:73
    • select count(*) as aggregate from `uc_cart_products` where cart_id='713a23fa67f20a94475428577e294bd7'
      200μsalphaeurekaselec_live_10_06_2022Cart.php#271
      Backtrace
      • 15. app/Models/Cart.php:271
      • 16. view::layouts._header:260
      • 18. vendor/laravel/framework/src/Illuminate/Filesystem/Filesystem.php:124
      • 19. vendor/laravel/framework/src/Illuminate/View/Engines/PhpEngine.php:58
      • 20. vendor/laravel/framework/src/Illuminate/View/Engines/CompilerEngine.php:73
    App\Models\Keywords
    6Keywords.php#?
    App\Models\Chapter
    1Chapter.php#?
    App\Models\Ebook
    1Ebook.php#?
        _token
        f8OzgDgEXUMYIQwzBcozANOuKXlifAUVwE8qpcjr
        uc_cart_id
        713a23fa67f20a94475428577e294bd7
        _previous
        array:1 [ "url" => "https://alpha.eurekaselect.com/chapter/9426" ]
        _flash
        array:2 [ "old" => [] "new" => [] ]
        PHPDEBUGBAR_STACK_DATA
        []
        path_info
        /chapter/9426
        status_code
        200
        
        status_text
        OK
        format
        html
        content_type
        text/html; charset=UTF-8
        request_query
        []
        
        request_request
        []
        
        request_headers
        0 of 0
        array:16 [ "x-https" => array:1 [ 0 => "1" ] "host" => array:1 [ 0 => "alpha.eurekaselect.com" ] "priority" => array:1 [ 0 => "u=0, i" ] "accept-encoding" => array:1 [ 0 => "gzip, deflate, br, zstd" ] "sec-fetch-dest" => array:1 [ 0 => "document" ] "sec-fetch-user" => array:1 [ 0 => "?1" ] "sec-fetch-mode" => array:1 [ 0 => "navigate" ] "sec-fetch-site" => array:1 [ 0 => "none" ] "accept" => array:1 [ 0 => "text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.7" ] "user-agent" => array:1 [ 0 => "Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)" ] "upgrade-insecure-requests" => array:1 [ 0 => "1" ] "sec-ch-ua-platform" => array:1 [ 0 => ""Windows"" ] "sec-ch-ua-mobile" => array:1 [ 0 => "?0" ] "sec-ch-ua" => array:1 [ 0 => ""HeadlessChrome";v="129", "Not=A?Brand";v="8", "Chromium";v="129"" ] "cache-control" => array:1 [ 0 => "no-cache" ] "pragma" => array:1 [ 0 => "no-cache" ] ]
        request_cookies
        []
        
        response_headers
        0 of 0
        array:5 [ "content-type" => array:1 [ 0 => "text/html; charset=UTF-8" ] "cache-control" => array:1 [ 0 => "no-cache, private" ] "date" => array:1 [ 0 => "Tue, 25 Feb 2025 15:12:05 GMT" ] "set-cookie" => array:2 [ 0 => "XSRF-TOKEN=eyJpdiI6IjV5L2Y2RjVIOVE1RnJ5Mi9KTzlVUlE9PSIsInZhbHVlIjoibWkvb3F2QzZHelZFZUZrOGlPNFNrUGtuQkhmUTFjbloza0Zod0M1TUR1M2tNMFRsWThhQjI0MHo3d0FlV05EcGVtUkxLUUlrMFdHTm1pUEMrQUxPSU1IMHk0aEtXYXkwNDFLUU9MTHVQZmFndm9hR0NHNkMzMlRaaEJrZEFXUUkiLCJtYWMiOiJkNjk4NTEwM2Y1NGFmZDBjZDNhZGI4ZTY2OTVkNGNjZGY4MDUyMDBhMDg2ZTZkZmIwZWM1YTk1M2QzMmQwODE4IiwidGFnIjoiIn0%3D; expires=Fri, 28 Feb 2025 03:12:05 GMT; Max-Age=216000; path=/; secure; samesite=laxXSRF-TOKEN=eyJpdiI6IjV5L2Y2RjVIOVE1RnJ5Mi9KTzlVUlE9PSIsInZhbHVlIjoibWkvb3F2QzZHelZFZUZrOGlPNFNrUGtuQkhmUTFjbloza0Zod0M1TUR1M2tNMFRsWThhQjI0MHo3d0FlV05EcGVtUkxLU" 1 => "alphaeurekaselectnet_session=eyJpdiI6Im9nL0oyQlRPT2JiV3FHM0xwUkQrSFE9PSIsInZhbHVlIjoiT2d1T0FMaDZYQTFSMVB5MTdZNmVNeXdPWUZCSlN1ZE8ydVBDZzFySDRBUkpwVWpxbFUxVHY2eVVqUDl5YjBUbDVuSHdhdzhQR2VTbjJNSy9MMDBLaTJRcjVoeWRET2NYa2JNZzR0R21WaTQzSlhxcmgwZmpsbUVteGJVQk9RZnEiLCJtYWMiOiI3MDcwOGRhMzkzNTY3YWRiODY3NDZjMzYyZjhiOTkzYjk4YTBhNzMwNWJiMDE0MWU5MTFkNDM0ZjFhYTU1NGYxIiwidGFnIjoiIn0%3D; path=/; secure; httponly; samesite=laxalphaeurekaselectnet_session=eyJpdiI6Im9nL0oyQlRPT2JiV3FHM0xwUkQrSFE9PSIsInZhbHVlIjoiT2d1T0FMaDZYQTFSMVB5MTdZNmVNeXdPWUZCSlN1ZE8ydVBDZzFySDRBUkpwVWpxbFUxVHY2eVV" ] "Set-Cookie" => array:2 [ 0 => "XSRF-TOKEN=eyJpdiI6IjV5L2Y2RjVIOVE1RnJ5Mi9KTzlVUlE9PSIsInZhbHVlIjoibWkvb3F2QzZHelZFZUZrOGlPNFNrUGtuQkhmUTFjbloza0Zod0M1TUR1M2tNMFRsWThhQjI0MHo3d0FlV05EcGVtUkxLUUlrMFdHTm1pUEMrQUxPSU1IMHk0aEtXYXkwNDFLUU9MTHVQZmFndm9hR0NHNkMzMlRaaEJrZEFXUUkiLCJtYWMiOiJkNjk4NTEwM2Y1NGFmZDBjZDNhZGI4ZTY2OTVkNGNjZGY4MDUyMDBhMDg2ZTZkZmIwZWM1YTk1M2QzMmQwODE4IiwidGFnIjoiIn0%3D; expires=Fri, 28-Feb-2025 03:12:05 GMT; path=/; secureXSRF-TOKEN=eyJpdiI6IjV5L2Y2RjVIOVE1RnJ5Mi9KTzlVUlE9PSIsInZhbHVlIjoibWkvb3F2QzZHelZFZUZrOGlPNFNrUGtuQkhmUTFjbloza0Zod0M1TUR1M2tNMFRsWThhQjI0MHo3d0FlV05EcGVtUkxLU" 1 => "alphaeurekaselectnet_session=eyJpdiI6Im9nL0oyQlRPT2JiV3FHM0xwUkQrSFE9PSIsInZhbHVlIjoiT2d1T0FMaDZYQTFSMVB5MTdZNmVNeXdPWUZCSlN1ZE8ydVBDZzFySDRBUkpwVWpxbFUxVHY2eVVqUDl5YjBUbDVuSHdhdzhQR2VTbjJNSy9MMDBLaTJRcjVoeWRET2NYa2JNZzR0R21WaTQzSlhxcmgwZmpsbUVteGJVQk9RZnEiLCJtYWMiOiI3MDcwOGRhMzkzNTY3YWRiODY3NDZjMzYyZjhiOTkzYjk4YTBhNzMwNWJiMDE0MWU5MTFkNDM0ZjFhYTU1NGYxIiwidGFnIjoiIn0%3D; path=/; secure; httponlyalphaeurekaselectnet_session=eyJpdiI6Im9nL0oyQlRPT2JiV3FHM0xwUkQrSFE9PSIsInZhbHVlIjoiT2d1T0FMaDZYQTFSMVB5MTdZNmVNeXdPWUZCSlN1ZE8ydVBDZzFySDRBUkpwVWpxbFUxVHY2eVV" ] ]
        session_attributes
        0 of 0
        array:5 [ "_token" => "f8OzgDgEXUMYIQwzBcozANOuKXlifAUVwE8qpcjr" "uc_cart_id" => "713a23fa67f20a94475428577e294bd7" "_previous" => array:1 [ "url" => "https://alpha.eurekaselect.com/chapter/9426" ] "_flash" => array:2 [ "old" => [] "new" => [] ] "PHPDEBUGBAR_STACK_DATA" => [] ]
        ClearShow all
        Date ↕MethodURLData
        #12025-02-25 15:12:05GET/chapter/9426112198