Page 237 - Biaxial Multiaxial Fatigue and Fracture

Critical Plane-Energy Based Approach for Assessment of Biaxial Fatigue Damage where ... 221

Appendix: NOMENCLATURE

b Subscript b corresponds to a block history.
C A material constant
E Modulus of Elasticity
f Subscript f corresponds to fatigue failure.
G Shear Modulus
i The ith 01 cycle in a block loading history
K* Cyclic strength coefficient
n* Cyclic strain hardening exponent
N Number of 01 cycles in a block loading history
Nr Number of blocks to failure
Pb Damage accumulation due to stress cycles within a block loading
R Stress ratio (minimum stress/maximum stress)
Sij The deviatoric stress
E,P, The equivalent plastic strain
0," The normal mean stress acting on the critical plane
The equivalent stress

*( *) The range of maximum shear acting on critical plane
The maximum and minimum normal stresses
The normal strain range acting on critical plane
The normal stress range acting on critical plane
The range of maximum shear stress acting on critical plane
The ratio of frequency of 011 frequency of 02
The principal strains
The axial fatigue ductility coefficient
The strain tensor (i and j=1,2,3)
The phase delay between two axes of loading
The shear fatigue ductility coefficient
The elastic Poisson's ratio
The angle during a cycle of stressing at which the Mohr's circle
is the largest and has the maximum value of shear strain.
The alternating longitudinal stress
The principal stresses
The alternating differential pressure across the wall thickness
The axial fatigue strength coefficient
The stress tensor (i and j=1,2,3)
The summation of principal stresses
The longitudinal and the transverse mean stresses, respectively
The shear fatigue strength coefficient