Stress Concentration/Intensity Factor Determination Using Thermo-Elastic Stress Analysis (TSA)

Tripathy, Swaraj Kumar and Raju, Gangadharan (2017) Stress Concentration/Intensity Factor Determination Using Thermo-Elastic Stress Analysis (TSA). Masters thesis, Indian Institute of Technology Hyderabad.

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Thermo-elastic stress analysis (TSA) is a non-destructive evaluation tool widely used for the ob- taining the stress fields in the vicinity of critical region of structures. In this work, TSA is used to determine the stress fields around discontinuities like hole and crack in metallic structures and further stress results were post processed to obtain the stress concentration/stress intensity factors. Firstly, experiments were conducted in a mild steel/aluminum specimen with a hole under a tensile- tensile cyclic loading and FLIR SC5000 thermography camera was used to capture the temperature distribution on the surface of the specimen. The stress fields obtained using the TSA equation were then validated using finite element(FE) modeling results (ABAQUS). Stress concentration factor for plate with a hole was evaluated using the TSA results and compared with analytical and FE results. Subsequently, experiments were conducted on mild steel specimen with straight and inclined cracks under cycle loading and the stress fields were obtained using TSA. A least square approach was then used to determine the fracture mechanics parameters, namely, stress intensity factors from the TSA stress results. Finite element modeling of the straight and inclined cracks were done to compute the stress intensity factors. The stress intensity factors calculated from TSA results were then compared with analytical and numerical results. This study will provide an experimental tool based on TSA technique along with the least square approach to determine the stress concentration/stress intensity factors for complex structures.

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IITH Creators:
IITH CreatorsORCiD
Raju, GangadharanUNSPECIFIED
Item Type: Thesis (Masters)
Uncontrolled Keywords: stress intensity factor, SIF, stress concentration factor, SCF, thermoelastic stress analysis, TSA, fracture mechanics, plate with a hole, crack specimen, TD885
Subjects: Physics > Mechanical and aerospace
Divisions: Department of Mechanical & Aerospace Engineering
Depositing User: Team Library
Date Deposited: 11 Jul 2017 11:23
Last Modified: 31 May 2019 05:37
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