Evaluation of low-cycle fatigue under nonuniform stress state conditions with strain criteria for fracture

1980 ◽  
Vol 12 (8) ◽  
pp. 1020-1024
Author(s):  
V. I. Dobrovol'skii
Keyword(s):  
Stress State ◽  
Low Cycle Fatigue ◽  
Cycle Fatigue ◽  
Nonuniform Stress

Low-Cycle Strength of Elements of Constructions

2018 ◽  
Author(s):  
Alexander Zvorykin ◽  
Roman Popov ◽  
Mykola Bobyr ◽  
Igor Pioro
Keyword(s):  
Stress State ◽  
Plane Stress ◽  
Low Cycle Fatigue ◽  
Plane Stress State ◽  
Structural Elements ◽  
Cycle Fatigue ◽  
Kinematic Equation ◽  
Effective Coefficients ◽  
Operational Life ◽  
Cycle Loading

Analysis of engineering approach to the operational life forecasting for constructional elements with respect to the low-cycle fatigue is carried out. Applicability limits for a hypothesis on existence of generalized cyclic-deforming diagram in case of complex low-cycle loading (deforming) are shown. It is determined, that under condition of plane-stress state and piecewise-broken trajectories of cycle loading with stresses and deformation checking the cyclic deforming diagram is united in limits of deformations, which are not exceeded 10 values of deformation corresponding material yield point. Generalized kinematic equation of material damageability is described. The method of damageability parameter utilization for increasing of accuracy calculation of structural elements low-cycle fatigue by using the effective coefficients of stresses and deformations taking into account the damageability parameter is given.

Research on High Temperature Low Cycle Fatigue Crack Propagation of 2.25Cr-lMo Steel under Complex Stress State

2011 ◽  
Vol 361-363 ◽  
pp. 1422-1425
Author(s):  
Wen Xiao Zhang ◽  
Guo Dong Gao ◽  
Guang Yu Mu
Keyword(s):  
Fatigue Crack ◽  
High Temperature ◽  
Stress State ◽  
Crack Propagation ◽  
Low Cycle Fatigue ◽  
Complex Stress ◽  
Complex Stress State ◽  
J Integral ◽  
Cycle Fatigue ◽  
Propagation Law

The crack propagation law of 2.25Cr-1Mo steel with notched cylinder was researched under high temperature low cycle fatigue. The crack propagation life was viewed by fatigue experiment and the equivalent stress-strain on the crack tip was calculated by the ANSYS. The equivalent J-integral range which was computed by equivalent elastic and plastic strain ranges were employed to denote the fatigue crack propagation rate. The results showed that crack propagation law of this material under complex stress state can be characterized by equivalent J-integral ranges and the relation between da/dN and ΔJf is not influenced by the type of notch and the load strain range.

scholarly journals A Study of High Temperature Low Cycle Fatigue Criterion in Biaxial Stress State

1985 ◽  
Vol 28 (241) ◽  
pp. 1341-1347 ◽  
Author(s):  
Naomi HAMADA ◽  
Masao SAKANE ◽  
Masateru OHNAMI
Keyword(s):  
High Temperature ◽  
Stress State ◽  
Low Cycle Fatigue ◽  
Biaxial Stress ◽  
Cycle Fatigue ◽  
Biaxial Stress State ◽  
Fatigue Criterion

Low Cycle Fatigue of CMSX-4 in Off-Axis Orientations and the Effect of a Multi-Axial Stress State

2012 ◽  
pp. 293-300 ◽  
Author(s):  
N.C. Barnard ◽  
D.W. MacLachlan ◽  
N. Jones ◽  
J. Mason-Flucke ◽  
S.M. Bagnall ◽  
...  
Keyword(s):  
Stress State ◽  
Low Cycle Fatigue ◽  
Axial Stress ◽  
Cycle Fatigue

Low Cycle Fatigue Evaluation of Pipe Bends With Local Wall Thinning Considering Multi-Axial Stress State

2015 ◽  
Vol 137 (4) ◽  
Author(s):  
Yoshio Urabe ◽  
Koji Takahashi ◽  
Hisanori Abe
Keyword(s):  
Fatigue Strength ◽  
Stress State ◽  
Low Cycle Fatigue ◽  
Axial Stress ◽  
Fatigue Tests ◽  
Cycle Fatigue ◽  
Pipe Bend ◽  
Wall Thinning ◽  
Damage Rule ◽  
Local Wall Thinning

Low cycle fatigue tests and finite element (FEM) analysis were conducted using 100A pipe bend specimens made of STPT410 carbon steel with and without local wall thinning local wall thinning was machined on the inside of the elbow and was prepared at extrados, crown, and intrados. The parameters of the wall thinning were same (the wall thinning ratio = 0.5, the wall thinning angle = 180 deg, and the wall thinning length = 100 mm) in the all test cases. The pipe bend specimens were subjected to the prescribed cyclic in-plane bending displacement with constant internal pressure of 0–12 MPa. Also, low cycle fatigue tests using sound pipe bend specimens were carried out for comparison. According to the test results, low cycle fatigue strength of wall thinned pipe bend specimens was not so different, regardless of location of wall thinning. Low cycle fatigue strength of the pipe bend specimens was beneath the best fit fatigue curve and its reason can be explained quantitatively by a proposed cumulated damage rule introducing ductility exhaustion considering multi-axial stress state. The validity of the new proposed cumulative damage rule was also confirmed by the another sample analysis using other reference data obtained by pre-overloaded in-plane cyclic bending tests.

scholarly journals Effect of Temperature, Microstructure, and Stress State on the Low Cycle Fatigue Behavior of Waspaloy

2009 ◽  
pp. 728-728-23 ◽  
Author(s):  
DR Stahl ◽  
M Mirdamadi ◽  
SY Zamrik ◽  
SD Antolovich
Keyword(s):  
Stress State ◽  
Low Cycle Fatigue ◽  
Fatigue Behavior ◽  
Effect Of Temperature ◽  
Cycle Fatigue

scholarly journals Low Cycle Fatigue of CMSX-4 in Off-axis Orientations and the Effect of a Multi-axial Stress State

2012 ◽  
Author(s):  
N. Barnard ◽  
D. MacLachlan ◽  
N. Jones ◽  
J. Mason-Flucke ◽  
S. Bagnall ◽  
...  
Keyword(s):  
Stress State ◽  
Low Cycle Fatigue ◽  
Axial Stress ◽  
Cycle Fatigue
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