A New Cumulative Damage Model—Part 4

1980 ◽  
Vol 47 (1) ◽  
pp. 40-44 ◽  
Author(s):  
J. L. Bogdanoff ◽  
F. Kozin
Keyword(s):  
Crack Length ◽  
Crack Growth ◽  
Damage Model ◽  
Cumulative Damage ◽  
Cumulative Distribution ◽  
Sample Function ◽  
Statistical Features ◽  
Growth Data ◽  
Mean And Variance ◽  
Cumulative Damage Model

Application of the new cumulative damage model to two sets of fatigue crack growth data is presented. It is shown that the model can describe the statistical features of crack growth including mean and variance of time to reach a specified crack length, cumulative distribution of time to reach a specified crack length, and sample function behavior. Moreover, this is done with very little effort.

scholarly journals Study on the Mechanical Cumulative Damage Model of Slope Fault Fracture Zone under the Cumulative Effect of Blasting Vibration

2020 ◽  
Author(s):  
Tingyao Wu ◽  
Zhou Chuanbo ◽  
Jiang Nan ◽  
Xia Yuqing ◽  
Bin Zhu
Keyword(s):  
Shear Strength ◽  
Fracture Zone ◽  
Damage Model ◽  
Cumulative Damage ◽  
Shaking Table ◽  
Blasting Vibration ◽  
Fault Fracture Zone ◽  
Table Model ◽  
Damage Theory ◽  
Cumulative Damage Model

As for the slope with fault fracture zone, the fault fracture zone is the main sliding surface, whose shear strength parameter is the main calculation parameter of landslide occurrence. In this paper, shaking table model tests and damage theory were used to study the change of shear strength and mechanical cumulative damage model of fault fracture zone under the blasting vibration cyclic load. At first, the slope of Daye Iron Mine is selected as a case to study the shear strength weakening law of fault fracture zone by the similarity theory and the principle of the orthogonal test, in which the influence of the characteristics of vibration loading on the shear strength parameters of fault fracture zone with different thicknesses was studied. Secondly, by the assumption of Lemaitre strain equivalence and according to the extreme value characteristics of the normal stress-shear stress curve, the damage theory model of the fault fracture zone was reconstructed, and the microelement of fault was selected for analysis and divided into two parts, including damaged and undamaged materials. Finally, the results of the shaking table model tests were compared with the results of the shear cumulative damage model to verify the rationality of the theoretical model. Moreover, the predicted results of the theoretical model can better reflect the degradation trend of the fault fracture zone with the loading amplitude, normal stress, and loading times. It can be used as a reference for slope stability prediction under the action of cumulative static and dynamic loads.

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