Structural Integrity Assessment of Thin‐Walled Structures

Abstract

As part of the concept of damage tolerant design, methods for the analytical and numerical simulation of ductile crack extension in thin‐walled structures are presented and discussed. They comprise the application of an analytical flaw assessment procedure as well as finite element analyses based on the crack tip opening displacement (CTOD), δ5, and finite element simulations of crack extension based on the crack tip opening angle (CTOA), a cohesive zone model and a ductile damage model. All these methods are or will become part of the GKSS Structural Integrity Assessment Method (SIAM), which also provides test procedures for the experimental determination of the required material parameters.

Dynamic Apparatus for CTOA Measurement in Pipeline Steels

“…Rivalin [1] used an apparatus to test pipeline material at speeds up to 15 m/s to approximate full-scale tests in the laboratory roximately 20-40 m/s for pipeline steels. Crack tip opening angle (CTOA) has been suggested as a method to characterize fully plastic fracture in a pipeline steel [2,3]. There have been a number of recent p CTOA for pipeline steels and on the fact that it is considered a computationally attractive operational parameter that provides an alternative to the J-R (resistance) curve and shows promise as a fracture criterion for resistance to crack growth.…”