Finite element analysis of tensile strength characteristics of certain composite material systems with induced fiber waviness
Pottavathri, Sai Bhargav Nair, Rajeev Asmatulu, Ramazan
Pottavathri, Sai Bhargav
Nair, Rajeev
Asmatulu, Ramazan
Citations
Altmetric:
Other Names
Location
Time Period
Advisors
Original Date
Digitization Date
Issue Date
2024
Type
Article
Genre
Keywords
Composites,In-plane fiber waviness,Finite element analysis
Subjects (LCSH)
Citation
Pottavathri, S. B., Nair, R., & Asmatulu, R. (2024). Finite element analysis of tensile strength characteristics of certain composite material systems with induced fiber waviness. European Journal of Advances in Engineering and Technology, 11(9), 10-22.
Abstract
The purpose of this study was to investigate the strength and effectiveness when induced with 'in-plane fiber tow waviness' in carbon, glass and kevlar fibers with thermosetting epoxy systems. An investigation of a single composite ply of carbon/epoxy, AS4/3501-6, IM7-977-3, glass/epoxy and Kevlar/epoxy was carried out to study the effect of fiber tow waviness. Waviness is usually induced by infusion processes and inherent in fabric architectures. Composite structural details like ply drops and ply joints can cause serious fiber misalignment. These are usually dependent on parameters such as ply thickness and have been the subject of recent studies. Waviness is expected to reduce compressive strength due to two primary factors. The fibers may be misoriented, which causes buckling mode of failure in compression and other modes of failure in tension. The waviness leads to an angular shift in the fiber orientation which eventually results in matrix dominated failure on normally orientated ply which is in the primary load direction (00). Maximum stress at failure and maximum load at failure values generated by the finite element model was validated using classic lamination plate theory. A precise geometry of waviness in different materials plies was modeled with different wave severity factor and a parametric study was conducted. Three different defects were modeled: an angle of misalignment ranging from 5 to 15 degrees, a wavelength ranging between 1 to 1.5 inch, and amplitude ranging from 0.05 to 0.1 inch. Load carrying capability of carbon, glass and Kevlar ply dropped drastically with the increase in the severity factor of the defects. This revealed that the effect of 'in-plane fiber tow waviness can lead to poor performance with high stresses that lead to a decrease in the strength ratio, ultimately leading to delaminations and cohesive matrix failure.
Table of Contents
Description
Publisher
Leon Publications
Journal
European Journal of Advances in Engineering and Technology
Book Title
Series
Digital Collection
Finding Aid URL
Use and Reproduction
Archival Collection
PubMed ID
DOI
ISSN
2394-658X