THE STRUCTURAL STRESS METHOD FOR THE FATIGUE ANALYSIS OF WELDED STRUCTURES
The stress concentration in a welded joint dominates the fatigue behavior of the joint. However, traditional finite element methods are not capable of consistently capturing the stress concentration effects due to their mesh-sensitivity. A robust stress analysis procedure has recently been developed at Battelle and extensively validated by various industries. The method is called VerityTM mesh-insensitive structural stress method and serves as a FE post-processing procedure to commercial FE packages. The Verity. method has been integrated into fe-safeTM and is available from Safe Technology Limited. The method is based on the mapping of the balanced nodal forces/moments along an arbitrary weld line into the work-equivalent tractions (or line forces/moments). A complex stress state due to notch effects can then be represented in the form of a simple stress state in structural mechanics in terms of through-thickness membrane and bending components at each nodal location. The resulting structural stress calculations are mesh-insensitive as long as the overall geometry of a component is reasonably represented in a finite element model. In addition to its mesh-insensitivity, the effectiveness of the structural stress parameter has been further validated by collapsing several thousands of fatigue tests available from literature into a single fatigue life curve, referred to as the master S-N curve.
Pingsha Dong John Draper
Center for Welded Structures Research, BATTELLE, Columbus, OH Safe Technology Limited, Sheffield, UK
国际会议
第九届工程结构完整性国际会议(The Ninth International Conference on Engineering Structural Integrity Assessment)
北京
英文
2007-10-15（万方平台首次上网日期，不代表论文的发表时间）