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• Traditional fracture and fatigue mechanics
  approaches such as the J-integral, CTOD or the DJ
  cannot capture fracture under conditions of
• Large Scale Yielding
• Ultra Low Cycle Fatigue
• Flaw Free Geometric Details

Fracture has been shown to be a governing limit
state in Special Concentrically Braced Frames
(SCBFs)
Micromechanical Fracture and Fatigue Models
Degradation of critical void size as evidenced by
micrographs
Models to capture void growth and coalescence
leading up to fracture
Combination of Ductile Fracture and High-Cycle
Fatigue Mechanisms
Stress Modified Critical Strain (SMCS)
Degraded Significant Plastic Strain (DSPS) Model
Ductile Fracture
Ultra-Low Cycle Fatigue (ULCF) Kanvinde (2004)
Calibration and Large-Scale Experiments and
Simulation
ABAQUS Finite Element Model of Brace Member
Small-scale calibration at Stanford University
using monotonic and cyclic notched bar tests, FEM
and Scanning Electron Micrographs
Large-scale brace analyses and tests conducted by
UC Davis
Critical location of ductile crack initiation
Fracture prediction (from above models)