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Logo: Institut für Baumechanik und Numerische Mechanik/Leibniz Universität Hannover
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Logo: Institut für Baumechanik und Numerische Mechanik/Leibniz Universität Hannover
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Master Thesis Work at Rolls-Royce Deutschland Ltd & Co KG

Topic: Study of stress intensity factors (SIF) by crack tip element and SIF solution

Motivation:

Crack propagation life is currently being estimated by using Raju-Neumann empirical equations for stress intensity factor (SIF) for cracks in 3D finite bodies. Conventionally stress field from In-house FE code (SC03) is extracted in a continuum domain and feed into In-house code for propagation life (SA16) to compute the remaining useful life of the structures. The geometrical correction factor is assumed appropriately. But there will be some difference in SIF expected when a crack tip is modelled in the structures at expected crack location. This will provide accurate calculation of residual life.   

Objective:

:: To compare the SIF derived out from crack tip elements (eg: ANSYS WB, 16.2) to SA16 and list out differences for various crack geometries.

:: To come up with knock down factors.

Contact:

Govindarajan Narayanan – ‚Govind‘
Section Lead for Structures (EO-35)
Structures & Transmissions Component Engineering
Rolls-Royce Deutschland Ltd & Co KG
Eschenweg 11, Dahlewitz, 15827 Blankenfelde-Mahlow, Germany 

Tel:  +49 (0) 33708 6 3808
E-Mail: govindarajan.narayananrolls-royce.com