Investigation of Single Fiber Composite residual strength pre and post fragmentation: Using Progressive Damage Analysis and HFGMC framework

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.

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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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IITH Creators:
IITH CreatorsORCiD
Chinthapenta, ViswanathUNSPECIFIED
Item Type: Thesis (PhD)
Subjects: Others > Mechanics
Divisions: Department of Mechanical & Aerospace Engineering
Depositing User: Team Library
Date Deposited: 31 May 2019 05:47
Last Modified: 31 May 2019 05:47
URI: http://raiithold.iith.ac.in/id/eprint/5402
Publisher URL:
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