Pandya, Pankaj and Chinthapenta, Viswanath
(2017)
Investigation of Single Fiber Composite residual
strength pre and post fragmentation: Using
Progressive Damage Analysis and HFGMC
framework.
PhD thesis, Indian institute of technology Hyderabad.
Abstract
Single fiber composites (SFC) provides an insight of damage behavior in the fiber reinforced polymer
(FRP). Study of stress redistribution after the fiber breakage in the SFC reveals the development
of different damage modes that occur in FRPs. Two separate analysis are presented in the current
work. The first one being the effective property calculation of multi fiber composite and the second
is the analysis of the fiber breakage in the SFC under tensile loading in the direction of the fiber.
Analysis of multi fiber composite is carried out using the representative volume element of SFC (SFCRVE) with periodic boundary conditions. High Fidelity Generalized Method of Cells (HFGMC) has
been used for the stress analysis to capture the influence of the length scales in both SFC-RVE
and SFC fiber fragmentation test. Progressive damage in the SFC-RVE is detected using the MultiContinuum Theory (MCT). The choice of MCT to detect damage is purely based on the convenience
to obtain the single damage metric in the SFC-RVE analysis. In order to detect the damage of fiber
in SFC with fiber fragmentation test, a maximum stress criterion is employed. Further, the use of
sudden material property degradation rule is common to both SFC-RVE and SFC fiber fragmentation
test. It assists in degrading the property of damaged subcells. Above three steps constitutes the
progressive damage analysis (PDA) and it is performed numerically in the FORTRAN language.
The analysis of the SFC-RVE determines the average properties of the multi-fiber composite. In the
result of SFC fiber fragmentation test, the evolution of matrix crack, fiber-matrix interface failure,
stress redistribution around the fiber failure is discussed. Realizing stress interactions along the
fiber-matrix interface provides and insight of load transfer from the matrix to the fiber. The effect
of fiber fragment length on the strength of fiber is also presented.
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