Study of interaction effect between a line inclusion and a hole using Digital Photoelasticity

Thorat, Satish Prakash and M, Ramji (2018) Study of interaction effect between a line inclusion and a hole using Digital Photoelasticity. Masters thesis, Indian Institute of Technology Hyderabad.

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The ease of fabrication and superior mechanical properties has emerged the new application areas for short-�bre-reinforced-polymers (SFRP). These SFRP has a new range of performance capabil- ities and is designed to �ll the property gap between polymers and sophisticated continuous-�bre- reinforced-polymers (CFRP). Increased applications of composite materials have also increased the need of defects studies and e�ect of these defects on their mechanical and other properties too. The most common and much intense defect observed in the composite materials is porosity, the presence of voids in the matrix phase. The void content is the potentially harmful defect in the composite materials and can signi�cantly a�ect the mechanical properties. In case of SFRPs, �bre end singularity problems are often modelled and studied as �bres as inclusions where the focus is on �nding fracture parameters like stress intensity factor. The present study is devoted to exploring the e�ect of void on the fracture properties, in case of SFRPs. This problem is studied for the simplest form where the voids are modelled for the 2D case, i.e. a circular hole near the �bre. Hence the problem solved is a rigid line inclusion(indicates �bres) with a hole(indicates 2D voids) embedded in a matrix-resin. There are two reasons for modelling the �bre as a rigid line inclusion. First is the thickness of the steel inclusion, that we have used, is very small compared to other specimen dimensions. Second is the strength of the steel is very high compared to the strength of matrix-resin which is such true case in SFRP where �bre has more strength than that of the matrix material. Instead of stress intensity factor, strain intensity factor is used for quantifying the singularities at the tip of the inclusion because it is more appropriate to use in case of inclusion problems. Further, the variation of strain intensity factor with respect to three parameters, namely diameter of a hole, length of line inclusion and the distance between the inclusion and a hole is studied. We have used a numerical methodology, based on the reciprocal theorem, to calculate the strain intensity factor of the inclusion in the �nite geometry. The input to this method is the actual elasticity solution, which is obtained using �nite element analysis (FEA). Furthermore, these FEA models are validated using the experimental technique, Digital Photoelasticity, qualitatively and quantitatively as well.

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IITH Creators:
IITH CreatorsORCiD
Item Type: Thesis (Masters)
Uncontrolled Keywords: Strain intensity factor, Line Inclusion, Digital photoelasticity
Subjects: Others > Mechanics
Divisions: Department of Mechanical & Aerospace Engineering
Depositing User: Team Library
Date Deposited: 17 Jul 2018 09:41
Last Modified: 22 May 2019 07:09
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