Abstract
Corrected stress field intensity obtained by averaging the superior limit of intrinsic damage dissipation work in critical domain, which considers thoroughly thermodynamic consistency within irreversible thermodynamic framework, was proposed for predictions of high-cycle fatigue endurance limits. Simultaneously, the effects of mean stress, additional hardening behavior related to non-proportional loading paths and stress gradients on multiaxial high-cycle fatigue are taken into account in the proposed approach. The approach is an extension of the general stress field intensity. For a better comparison, existing multiaxial high-cycle fatigue criteria were employed to predict the endurance limits of different metallic materials subjected to different multiaxial loading paths, and it is shown that present proposal performs better from statistical value of error indexes, which make the proposed approach of corrected stress field intensity and its associated concepts provide a new conception to predict endurance limits of multiaxial high-cycle fatigue with high accuracy.
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Abbreviations
- c :
-
Coefficient considering the influence of stress gradients on the high-cycle fatigue strength
- D :
-
Internal damage variable
- \( \mathop D\limits^{ \cdot } \) :
-
Damage evolution rate
- \( D_{\text{c}} \) :
-
Critical value of damage
- E :
-
Elastic modulus (MPa)
- f − 1 :
-
Endurance limit in reversed rotative bending (MPa)
- f − 1 N :
-
Conditional endurance limit in reversed rotative bending (MPa)
- g :
-
Function of Helmholtz free energy (J m−3)
- \( K_{\text{m}} \), K 1, K 2 :
-
Reduced material parameters
- K 3 :
-
Pure torsion fatigue strength coefficient (MPa)
- K 4 :
-
Rotative bending fatigue strength coefficient (MPa)
- M :
-
A material parameter associated with damage evolution model
- N :
-
Number of cycles (cycle)
- \( N_{\text{f}} \) :
-
Predicted life solely considering a point in the critical domain (cycle)
- \( N_{\text{fp}} \) :
-
Predicted life considering the total critical domain (cycle)
- p − 1 :
-
Endurance limit in reversed plane bending (MPa)
- p − 1 N :
-
Conditional endurance limit in reversed plane bending (MPa)
- \( \mathop {q_{i} }\limits^{ \cdot } \) :
-
Vector of heat flux (J s−1 m−1)
- \( \mathop {q_{i,i} }\limits^{ \cdot } \) :
-
Transition rate of heat flux gradient (J s−1)
- \( Q_{\text{cycle}} \) :
-
Intrinsic dissipation (J m−3)
- r :
-
Radius vector within polar coordinates (m)
- R :
-
Radius of smooth specimen (m)
- R γ :
-
Three-axis factor
- s :
-
State entropy (J K−1 m−3)
- \( \mathop s\limits^{ \cdot } \) :
-
Evolution rate of state entropy (J K−1 s−1 m−3)
- S :
-
Total cross-sectional area for element (m−2)
- \( S_{\text{D}} \) :
-
Total area of all micro-cracks and cavities for element (m−2)
- S ijkl :
-
The fourth-order elastic stiffness tensor (MPa)
- T :
-
Temperature (K)
- \( \mathop T\limits^{ \cdot } \) :
-
Temperature transition rate (K s−1)
- T i :
-
Temperature gradients (K m−1)
- V :
-
Volume of the critical domain (m3)
- Y :
-
Generalized force of damage driving (MPa)
- Y i :
-
Discrete sequence toward generalized force of damage driving (MPa)
- Y max (Y min):
-
Maximum (minimum) generalized force of damage driving in one cycle (MPa)
- \( \sigma_{\text{damage}} \) :
-
Corrected stress field intensity resulting from homogenization toward the superior limit of intrinsic damage dissipation work in critical domain (MPa)
- σ ij :
-
Stress tensor (MPa)
- \( \sigma_{\text{eq}} \) :
-
Von Mises equivalent stress (MPa)
- \( \sigma_{\text{m}} \) :
-
Hydrostatic stress (MPa)
- \( \sigma_{\text{eqa}} \) :
-
Equivalent stress amplitude considering the effect of mean stress and additional hardening on multiaxial high-cycle fatigue endurance limits (MPa)
- \( \sigma_{\text{a}} \) :
-
Normal stress amplitude (MPa)
- σ − 1 :
-
Endurance limit in reversed tension (MPa)
- σ − 1 N :
-
Conditional endurance limit in reversed tension (MPa)
- θ :
-
Angle vector within polar coordinates (rad)
- \( \varepsilon_{ij}^{p} \, \) :
-
Micro-plastic strain tensor
- \( \mathop {\varepsilon_{ij}^{p} }\limits^{ \cdot } \) :
-
Micro-plastic strain rate tensor
- ɛ e ij (ɛ e kl ):
-
Elastic strain tensor
- \( \mathop {\varepsilon_{ij}^{e} }\limits^{ \cdot } \) :
-
Elastic strain rate tensor
- ρ :
-
Material density (kg m−3)
- ρ max :
-
Radius of the critical domain (m)
- 〈·〉max :
-
Maximum value in symbol
- ν :
-
Poisson ratio
- α, β 0 :
-
Material parameters dependent on S–N curve in reversed tension
- β 1 :
-
Material parameter dependent on S–N curve in reversed torsion
- β 2 :
-
Material parameter dependent on S–N curve in rotative bending
- \( \delta D_{\text{i}} \) :
-
Increment of internal damage
- \( \tau_{\text{a}} \) :
-
Shear stress amplitude (MPa)
- τ − 1 :
-
Endurance limit in reversed torsion (MPa)
- τ − 1 N :
-
Conditional endurance limit in reversed torsion (MPa)
- ϕ :
-
Phase angle difference between tension loading and torsion loading (°)
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The authors gratefully acknowledge the support provided by Key Natural Science Foundation of Hebei Province of China (E2017203161).
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Li, Hr., Peng, Y., Liu, Y. et al. Corrected stress field intensity approach based on averaging superior limit of intrinsic damage dissipation work. J. Iron Steel Res. Int. 25, 1094–1103 (2018). https://doi.org/10.1007/s42243-018-0157-5
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DOI: https://doi.org/10.1007/s42243-018-0157-5