PSI - Issue 28

NikolayA. Makhutov et al. / Procedia Structural Integrity 28 (2020) 1378–1391 N.Makhutov, M.Gadenin, D.Reznikov/ Structural Integrity Procedia 00 (2019) 000–000

1379

2

external and internal thermomechanical loading at nano-, micro-, meso-, and macro levels in the application to fracture mechanics and structural integrity.

Nomenclature A

mechanical energy accumulated damage

d

specific heat capacity of the material is volumetric heat capacity plasticity reduction factor at the notch

С p

c

D ec

strain

e

e

normalized strain critical strain fracture strain nominal strain plastic strain

e c e f e n e p e ij e y

components of the plastic strain tensor

p

yield strain max c e normalized maximum local strains in notch zones E energy absorbed by the material е  strain rate F force I c

yield stress reduction factor due to stress triaxiality at the notch

temperature

t

load growth factor size of the crack (defect)

k Q

l

initial length of the deformable solid final length of the deformable solid

l 0 l f m N

strain hardening exponent number of loading cycles numbers of cycles to failure stress concentration factor strain concentration factor

N c K σ K e K t

theoretical stress concentration factor normalized strain intensity factor normalized stress intensity factor probability of failure external and internal impacts energy dissipated in the form of heat normalized nominal stress

Ie K

I K

n 

P Q

Q e q i,j

divergence of the heat flux vector and dots denote time derivatives

risk

R S T U α

characteristic of resistance to impacts

absolute temperature ( K )

expected losses, parameter of state

α T β T

linear temperature expansion coefficient volumetric thermal expansion coefficient

fatigue limit critical stress

 -1

 c

σ max c

maximum local stress at the notch root