Failure analysis of delaminated carbon/epoxy composite under pure bending: validation with numerical analysis
| Autor: | Bhaskara Rao Pathakokila, Suresh Gamini, Phaneendra Kumar Kopparthi, Srikar Gemaraju |
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| Rok vydání: | 2021 |
| Předmět: |
Materials science
Mechanical Engineering Composite number Delamination Stiffness 02 engineering and technology Bending Epoxy 021001 nanoscience & nanotechnology 020303 mechanical engineering & transports 0203 mechanical engineering Flexural strength Mechanics of Materials Modeling and Simulation visual_art Pure bending visual_art.visual_art_medium medicine General Materials Science medicine.symptom Composite material 0210 nano-technology Beam (structure) |
| Zdroj: | Multidiscipline Modeling in Materials and Structures. 17:974-989 |
| ISSN: | 1573-6105 |
| DOI: | 10.1108/mmms-01-2021-0015 |
| Popis: | PurposeDelamination is a common and crucial damage mode which occurs during manufacturing of layered composites or their service life. Its existence leads to degradation in mechanical properties or even structural failure of composites. Hence, the purpose of this article is to study the effect of induced delamination on flexural performance of CFRP composites.Design/methodology/approachIn this article, the flexural behaviors of intact and delaminated carbon/epoxy laminates were investigated under pure bending. A circular PTFE film was introduced during fabrication to create artificial delamination. Moreover, finite element models were developed for intact and delaminated composites using ANSYS. The created models were discretized using 3D structural eight node solid elements.FindingsThe delamination influenced considerably flexural properties of composite. The composite exhibited a linear elastic nature prior to the damage of top ply on the compression side. The flexural strength and stiffness of the composite reduced to 44.5% and 18.2% respectively due to the existence of artificial delamination. The results of four point bending experiments and finite element analysis agreed for both intact and delaminated composites within acceptable error. Finally for same composites, first ply failure analysis was carried out using Tsai-Hill, Tsai-Wu and Hashin failure criteria.Originality/valueIn pure bending, beam section of the middle portion is free from shear. It is not so in case of three-point bending. Hence, the effect of embedded artificial defect on bending performance of CFRP composite due to pure bending has been investigated. |
| Databáze: | OpenAIRE |
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