Full text
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| Author(s): |
Sebastian Cravero
Total Authors: 1
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| Document type: | Master's Dissertation |
| Press: | São Paulo. |
| Institution: | Universidade de São Paulo (USP). Escola Politécnica (EP/BC) |
| Defense date: | 2004-09-24 |
| Examining board members: |
Claudio Ruggieri;
Túlio Nogueira Bittencourt;
Miguel Mattar Neto
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| Advisor: | Claudio Ruggieri |
| Abstract | |
This work presents a numerical investigation of crack-tip constraint for SE(T) specimens and axially surface cracked pipes using plane-strain, nonlinear computations. The primary objective is to gain some understanding of the potential applicability of constraint designed fracture specimens in defect assessments of pressurized pipelines and cylindrical vessels. The present study builds upon the J-Q approach using planestrain solutions to characterize effects of constraint on cleavage fracture behavior for the analyzed fracture specimens and cracked pipes. Under increased loading, each cracked configuration follows a characteristic J-Q trajectory which enables comparison of the corresponding driving force curve in the present context. While the planestrain analyses do not address 3D effects (thereby not including the coupling between in-plane and through-thickness effects on crack-tip fields), the results provide a strong support for use of constraint-designed SE(T) specimens in fracture assessments of pressurized pipes and cylindrical vessels. (AU) | |