scholarly journals Cumulative fatigue damage of stress below the fatigue limit in weldment steel under block loading

2020 ◽  
Vol 43 (7) ◽  
pp. 1419-1432
Author(s):  
Lei He ◽  
Hiroyuki Akebono ◽  
Atsushi Sugeta ◽  
Yoshiichirou Hayashi
Keyword(s):  
Fatigue Limit ◽  
Fatigue Damage ◽  
Block Loading ◽  
Cumulative Fatigue Damage

Microstructural evaluation of cumulative fatigue damage below the fatigue limit

1996 ◽  
Vol 34 (9) ◽  
pp. 1497-1502 ◽  
Author(s):  
C. Fukuoka ◽  
Y.G. Nakagawa
Keyword(s):  
Fatigue Limit ◽  
Fatigue Damage ◽  
Microstructural Evaluation ◽  
Cumulative Fatigue Damage

scholarly journals Cumulative Fatigue Damage by Block Loading with p-Distribution (2 nd Report)

1982 ◽  
Vol 1982 (152) ◽  
pp. 372-380
Author(s):  
Kunihiro Iida ◽  
Sungjo Hong
Keyword(s):  
Fatigue Damage ◽  
Block Loading ◽  
Cumulative Fatigue Damage ◽  
P Distribution

scholarly journals “Cumulative Fatigue Damage by Block Loading with p-Distribution (1st Report)”

1980 ◽  
Vol 1980 (148) ◽  
pp. 268-273 ◽  
Author(s):  
Kunihiro Iida ◽  
Sungjo Hong
Keyword(s):  
Fatigue Damage ◽  
Block Loading ◽  
Cumulative Fatigue Damage ◽  
P Distribution

Cumulative Fatigue Damage under a Symmetrical-Sawtooth Loading Programme

1965 ◽  
Vol 7 (2) ◽  
pp. 138-151 ◽  
Author(s):  
K. J. Marsh
Keyword(s):  
Mild Steel ◽  
Fatigue Limit ◽  
Fatigue Damage ◽  
Bending Fatigue ◽  
Fatigue Damage Accumulation ◽  
Rotating Bending Fatigue ◽  
Rotating Bending ◽  
Stress Cycles ◽  
Cumulative Fatigue Damage ◽  
Stress Block

A description is given of a modified rotating-bending fatigue machine which enables specimens to be submitted to repeated stress cycles modulated by a symmetrical-sawtooth wave, i.e. to a triangular stress block. Results are given of tests on plain and sharply notched mild-steel specimens and are discussed with reference to some existing concepts of fatigue damage accumulation. It is shown that, for mild steel, a hypothesis which neglects stress cycles having an amplitude of less than the fatigue limit of the material gives an optimistic prediction of specimen life but that to neglect cycles of amplitude less than 80 per cent of the fatigue limit gives results which agree closely with experiment.

scholarly journals Investigation of Changes in Fatigue Damage Caused by Mean Load under Block Loading Conditions

Materials ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 2738
Author(s):  
Roland Pawliczek ◽  
Tadeusz Lagoda
Keyword(s):  
Fatigue Life ◽  
Fatigue Damage ◽  
Strain Curve ◽  
Mean Value ◽  
Fatigue Properties ◽  
Stress Strain ◽  
Reference Case ◽  
Block Loading ◽  
The Mean ◽  
Mean Strain

The literature in the area of material fatigue indicates that the fatigue properties may change with the number of cycles. Researchers recommend taking this into account in fatigue life calculation algorithms. The results of simulation research presented in this paper relate to an algorithm for estimating the fatigue life of specimens subjected to block loading with a nonzero mean value. The problem of block loads using a novel calculation model is presented in this paper. The model takes into account the change in stress–strain curve parameters caused by mean strain. Simulation tests were performed for generated triangular waveforms of strains, where load blocks with changed mean strain values were applied. During the analysis, the degree of fatigue damage was compared. The results of calculations obtained for standard values of stress–strain parameters (for symmetric loads) and those determined, taking into account changes in the curve parameters, are compared and presented in this paper. It is shown that by neglecting the effect of the mean strain value on the K′ and n′ parameters and by considering only the parameters of the cyclic deformation curve for εm = 0 (symmetric loads), the ratio of the total degree of fatigue damage varies from 10% for εa = 0.2% to 3.5% for εa = 0.6%. The largest differences in the calculation for ratios of the partial degrees of fatigue damage were observed in relation to the reference case for the sequence of block n3, where εm = 0.4%. The simulation results show that higher mean strains change the properties of the material, and in such cases, it is necessary to take into account the influence of the mean value on the material response under block loads.

scholarly journals Bending Strength of Spur Gear Teeth : 1st Report, Cumulative Fatigue Damage of Normalized 0.45% Carbon Steel

1982 ◽  
Vol 25 (202) ◽  
pp. 671-678 ◽  
Author(s):  
Toshimi TOBE ◽  
Noboru MARUYAMA
Keyword(s):  
Carbon Steel ◽  
Fatigue Damage ◽  
Bending Strength ◽  
Spur Gear ◽  
Gear Teeth ◽  
Cumulative Fatigue Damage

scholarly journals Fatigue Crack and Cumulative Fatigue Damage in Notched Specimens : 2nd Report, Effect of Notch Sharpness on Overstressing Effect

1971 ◽  
Vol 37 (301) ◽  
pp. 1645-1652
Author(s):  
Hajime NAKAZAWA ◽  
Takashi KOIZUMI ◽  
Hideo KOBAYASHI ◽  
Susumu YAMAMOTO
Keyword(s):  
Fatigue Crack ◽  
Fatigue Damage ◽  
Notched Specimens ◽  
Notch Sharpness ◽  
Cumulative Fatigue Damage
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