Work Item
ASTM WK14922

New Practice for Determination of Fracture Toughness of Ferritic Steel Welds

1. Scope

The scope of activity within the Committee shall be the advancement of knowledge and understanding of fatigue and fracture phenomena by:

* Promoting research and development of, and education related to, methods to evaluate the fatigue and fracture characteristics of materials and structures;
* Developing standards, proposals, and, when necessary, emergency standards for evaluating fatigue and fracture behavior. The preparation of Standard Practices, Guides, Terminology, and Test Methods is included in this development;
* Sponsoring technical meetings and symposia either independently or cooperatively with other organizations;
* Coordinating the Committee's activities with those of organizations having mutual interests, including other relevant ASTM Committees and non-ASTM organizations.
The range of Committee interest includes all engineering applications in which materials, processed parts, components or complete assemblies are subjected to loadings that might result in degradation of material or loss of structural integrity. Specific areas of interest include:

* All phenomena related to cyclic deformation, damage accumulation, crack formation, crack growth, and fracture of either materials or structures;
* Physical deformation and fracture mechanisms;
* Constitutive modeling, stress and strain analysis ranging from global to local (e.g., the crack-tip vicinity), and fracture mechanics analysis;
* Models that relate loading, deformation, configuration and damage parameters to life and residual strength behavior;
* Fatigue and fracture behavior of welded, fastened, and bonded components or assemblies of metallic or composite materials;
* Relationships between fatigue and fracture behavior and: (a) material characteristics (e.g., microstructure; thermo-mechanical history; residual stresses), (2) design details (e.g., stress concentrations; construction methods) and (3) operational details (e.g., quality control procedures; fretting; wear; mechanical, chemical, thermal, and radiation environment); and
* Methods and procedures, including statistical analysis, by which fatigue and fracture characteristics may be described, evaluated, and detected.

Keywords

ferritic steel welds; fracture toughness; weldment; residual stresses; fatigue precracking; local compression; step-wise high R ratio; reverse bend

Rationale

The proposed standard will provide guidance on how to prepare specimens from welds for fracture toughness testing, and how to account for the unique characteristics of welds in the interpretation of results. The standard itself does not include fracture toughness testing; it refers the user to other established standards for actual testing. Users for this standard would be anyone that is concerned about structural integrity and fitness for service of welded structures.

The title and scope are in draft form and are under development within this ASTM Committee.

Details

Developed by Subcommittee: E08.07

Committee: E08

Staff Manager: Brian Milewski

Work Item Status

Date Initiated: 03-26-2007

Technical Contact: Stephen Graham

Item: 001

Ballot: E08.07 (07-01)

Status: Will Reballot Item

Item: 021

Ballot: E08 (11-01)

Status: Ballot Item Approved