Title: Transient creep‐fatigue crack growth in creep‐brittle materials: Application to Alloy 718

Journal Article · · Fatigue and Fracture of Engineering Materials and Structures
DOI: https://doi.org/10.1111/ffe.13788 · OSTI ID:1876460
 [1];  [2];  [3];  [4]
  1. School of Mechanical Engineering Purdue University West Lafayette IN USA, National Institute of Aerospace Hampton VA US
  2. School of Mechanical and Manufacturing Engineering University of New South Wales (UNSW Sydney) Sydney New South Wales Australia, School of Civil Engineering The University of Sydney Sydney New South Wales Australia
  3. School of Mechanical Engineering Purdue University West Lafayette IN USA
  4. School of Mechanical and Manufacturing Engineering University of New South Wales (UNSW Sydney) Sydney New South Wales Australia

Abstract This study presents incremental finite element computations of creep‐fatigue crack growth in Alloy 718 at in air. Alloy 718 is representative of creep‐brittle materials, in which viscoplastic deformation is restricted near the tip of a growing crack. The computations predict crack growth using a unique combination of an irreversible cohesive zone formulation and a strain gradient viscoplastic material model based on the Kocks–Mecking formulation. Cohesive zone damage parameters are estimated using sustained loading and constant‐amplitude cyclic loading experiments. Computations of crack extension under three different waveforms containing overloads all predict post‐overload retardation. The amount of retardation depends strongly on the overload ratio, consistent with experiments in the literature using similar waveforms. Analysis of the crack‐tip fields demonstrates retardation is associated with unloading in the highly deformed material near the advancing crack tip. Dynamic recovery and geometrically necessary dislocations are shown to significantly influence post‐overload crack extension.

Research Organization:
Purdue Univ., West Lafayette, IN (United States)
Sponsoring Organization:
USDOE; USDOE Office of Fossil Energy and Carbon Management (FECM)
Grant/Contract Number:
FE0011796
OSTI ID:
1876460
Journal Information:
Fatigue and Fracture of Engineering Materials and Structures, Journal Name: Fatigue and Fracture of Engineering Materials and Structures Journal Issue: 10 Vol. 45; ISSN 8756-758X
Publisher:
Wiley-BlackwellCopyright Statement
Country of Publication:
United Kingdom
Language:
English

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