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Fitness for Service

A method incorporating residual stresses.

Welding-induced residual stress distributions are required as a priori in performing fracture-mechanics-based fitness for-service (FFS) assessments of welded components.

Unfortunately, the residual stress prescriptions in current Codes and Standards are extremely ineffective. They tend to be very limited in extent, overly conservative, and inconsistent from one Code to another.

In addition, almost all FFS procedures in treating weld residual stresses fail to consider the residual stress redistributions in fracture-mechanics parameter calculation. The result is gross over-estimation of residual stress effects on structural integrity; to obtain a reasonable residual stress estimate, the required computational and experimental analysis procedures can be too cost-prohibitive to be used in performing day-to-day FFS assessments.

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The Battelle Solution

Over the last several decades, Battelle’s Center for Welded Structures Research has developed a unique suite of advanced computational simulation tools to address these shortcomings. These tools provide:

  • Proven performance, having been used to develop comprehensive residual stress distributions for FFS applications using many joint geometries and component types
  • Validation using a large amount of detailed measurement data
  • A unified residual stress description based on an unprecedented knowledge base and the capture of the most critical parameters governing through-thickness residual stress distributions for FFS purposes

Graph of Verity