scholarly journals Numerical Analysis of Fatigue Damage Behavior in Fiber Composites under Different Block Loading Conditions

2021 ◽  
Author(s):  
M. Brod ◽  
A. Dean ◽  
S. Scheffler ◽  
M. Bishara ◽  
R. Rolfes
Keyword(s):  
Numerical Analysis ◽  
Fatigue Damage ◽  
Fiber Composites ◽  
Loading Conditions ◽  
Damage Behavior ◽  
Block Loading

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 Fatigue damage analysis of aluminized glass fiber composites

2005 ◽  
Vol 407 (1-2) ◽  
pp. 1-6 ◽  
Author(s):  
J.M. Ferreira ◽  
J.T.B. Pires ◽  
J.D. Costa ◽  
Z.Y. Zhang ◽  
O.A. Errajhi ◽  
...  
Keyword(s):  
Glass Fiber ◽  
Fatigue Damage ◽  
Fiber Composites ◽  
Damage Analysis ◽  
Glass Fiber Composites ◽  
Fatigue Damage Analysis
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