مورد إلكتروني
Imperfection-insensitive rapid tow sheared rocket launch structures: a design, build, and test of an imperfection-insensitive composite cylinder
| العنوان: | Imperfection-insensitive rapid tow sheared rocket launch structures: a design, build, and test of an imperfection-insensitive composite cylinder |
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| المؤلفون: | Lincoln, Reece L |
| بيانات النشر: | University of Bristol 2023 |
| نوع الوثيقة: | Electronic Resource |
| مستخلص: | Composites are utilised in the design of state-of-the-art aerospace and energy structures for weight and performance advantages. A good example of a structure where the conflicting requirements of weight and performance must be balanced is a thin-walled monocoque rocket launch structure: the architecture must be stable under axial compression while maintaining low mass to increase payload capacity. However, axially-compressed thin-walled monocoque cylinders are sensitive to manufacturing and loading imperfections and often buckle well before classical theory would predict, leading to either stiffened-shell designs that increase fabrication costs or the use of conservative safety factors that add mass to the structure. Hence, the dilemma of choosing between heavier conservative guidelines and costlier manufacturing complexity makes monocoque thin-walled composite structures an attractive option if the associated imperfection-sensitivity can be mitigated. In the work herein, a design-build-test campaign of an imperfection insensitive cylinder is accomplished through the use of variable-angle tow composites manufactured using Rapid Tow Shearing (RTS). RTS allows fibres to be sheared in curvilinear paths instead of straight paths and therefore opens avenues towards stiffness blending and tailoring of load paths. RTS also exhibits a fibre-angle-thickness coupling that increases the local thickness of the tow when sheared, enabling the in-situ embedding of stiffening features. This thesis explores the viability of using the non-uniform stiffness field created by RTS as a means to alleviate imperfection sensitivity of axially-compressed thin-walled cylinders. To achieve an imperfection-insensitive RTS design, the present work first explores the influence of design parameters on the mechanical response of RTS-designed cylinders under axial compression both with and without geometric imperfections. It is shown that the influence of shearing periodicity, a |
| مصطلحات الفهرس: | Buckling, Composite, Cylinders, Imperfections, Insensitivity, Doctor of Philosophy (PhD) |
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| الإتاحة: | Open access content. Open access content |
| ملاحظة: | English |
| أرقام أخرى: | BUB oai:research-information.bris.ac.uk:studenttheses/b4b4511c-5b89-4ba6-8a13-1324bea50bd8 https://research-information.bris.ac.uk/en/studentTheses/b4b4511c-5b89-4ba6-8a13-1324bea50bd8 1383756401 |
| المصدر المساهم: | UNIVERSITY OF BRISTOL From OAIster®, provided by the OCLC Cooperative. |
| رقم الأكسشن: | edsoai.on1383756401 |
| قاعدة البيانات: | OAIster |
| الوصف غير متاح. |