A Local Approach Based on the Weibull Sstress to Predict Geometry Effects in Tensile Wirs

• Grant number: 25/01361-4
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• Start date: June 01, 2025
• End date: May 31, 2027
• Field of knowledge: Engineering - Naval and Oceanic Engineering - Marine and Ocean Structures
• Principal Investigator: Claudio Ruggieri
• Grantee: Pavan Kumar
• Host Institution: Escola Politécnica (EP). Universidade de São Paulo (USP). São Paulo , SP, Brazil
• Associated research grant: 24/11162-6 - Evaluation of Fracture Toughness and Master Curve in Tensile Armours Using Subsize Specimens: Experiments and Methodological Developments, AP.R

Abstract

The extension of service life and assessment of critical defects in flexible pipelines and risers represent a central element for the safe exploration and production of O&G in deep and ultra-deep waters. Specifically, in the case of tensile armor wires, there is clearly a significant and important gap regarding the proper assessment of their fracture resistance properties, namely: tensile wires have subsize cross-sections, which therefore prevents the extraction of larger specimens with more conventional (standardized) geometry. This adds great complexity to the execution of tests and, perhaps more importantly, to the correct interpretation of the toughness results obtained experimentally and their correlation with the structural component in service. Therefore, the proposed research project complements the activities already described in the project entitled *Toughness Assessment and Master Curve in Tensile Wires Using Sub-Sized Specimens: Experiments and Methodological Developments* (FAPESP Process 2024-11162-6) and incorporates additional and important advancements in the development of a methodology to predict geometric effects in tensile wires using the local (probabilistic) model based on Weibull Stress.