Testing and analysis of ultra thick composites
2010 (English)In: Composites Part B: Engineering, ISSN 1359-8368, Vol. 41, no 4, 326-336 p.Article in journal (Refereed) Published
For the development of a composite main landing gear fitting in carbon fiber reinforced plastics the behavior and performance of Ultra Thick Laminate components is investigated. Material thicknesses exceeds 60 mm. For the purpose of validation a test program is arranged using T-cross sections subjected to multiple load cases. The components are manufactured entirely with non crimped fabrics (NCF) using an adapted open mould manufacturing process. In addition to these T-Sections large full scale subcomponents of the entire fitting are manufactured and tested. As main topic of this paper standard FE methods are investigated and validated for thick structures using the generated test results. Due to the presence of transverse shear and normal stresses a 3D modeling approach is chosen. Transverse shear and normal stresses are indentified as main failure cause and failure is mainly initiated in the curved regions. Solid composite brick elements offer an efficient way to model thick structures. These are incapable of calculating accurate shear stresses on a ply level; usable results are however achieved by discretisation of the component with multiple elements over thickness. In addition stress gradients in the failure region are small; stress variations on a ply level are minimal. Out of plane material properties are not available and initial assumptions are made. Material correction factors (degradation) are introduced and discussed.
Place, publisher, year, edition, pages
Elsevier, 2010. Vol. 41, no 4, 326-336 p.
Carbon carbon composites, Finite element analysis (FEA), Ultra thick laminates
IdentifiersURN: urn:nbn:se:kth:diva-27551DOI: 10.1016/j.compositesb.2009.12.004ISI: 000278253800008ScopusID: 2-s2.0-77951298968OAI: oai:DiVA.org:kth-27551DiVA: diva2:378773
QC 201012162010-12-162010-12-132015-06-04Bibliographically approved