The Study of Fatigue Crack Growth Rate When Consider the Impact of the Crack Tip Plastic Zone of the Concrete

2013 ◽  
Vol 19 (4) ◽  
pp. 589-597
Author(s):  
Yue Chen ◽  
Jianting Zhou ◽  
Lu Liu ◽  
Ma Sun
Keyword(s):  
Growth Rate ◽  
Fatigue Crack ◽  
Crack Growth Rate ◽  
Fatigue Crack Growth ◽  
Plastic Zone ◽  
Crack Growth ◽  
Fatigue Crack Growth Rate ◽  
Crack Tip ◽  
The Impact

Modeling of Fatigue Crack Growth under High-Low Sequence Loading

2012 ◽  
Vol 224 ◽  
pp. 65-68
Author(s):  
Zhi Wei Yao ◽  
Bao Xiang Qiu ◽  
Xiao Gui Wang
Keyword(s):  
Growth Rate ◽  
Fatigue Crack ◽  
Crack Growth Rate ◽  
Fatigue Crack Growth ◽  
Plastic Zone ◽  
Crack Growth ◽  
Crack Closure ◽  
Fatigue Crack Growth Rate ◽  
Cyclic Plastic ◽  
Cyclic Plastic Zone

The fatigue crack growth behavior of one compact tension specimen of 16MnR steel under high-low sequence loading was investigated. The symmetric half finite element model under plane-stress state was used to calculate the elastic-plastic stress-strain responses, in which the Armstrong-Frederick type cyclic plasticity model was implemented as a user material subroutine UMAT of ABAQUS. A recently developed dynamic crack growth model was used to simulate the effects of high loading step on the successive low loading step. The detailed evolution process of the crack closure and cyclic plastic zone within the retardation region of fatigue crack growth was obtained. The extend of the crack closure, the size of cyclic plastic zone and the stress gradient have significant influence on the fatigue crack growth rate. The predicted fatigue crack growth rate is in good agreement with the experimental data.

Fatigue Crack Growth in Fe Mini-Samples Consolidated by Means of Impact Sintering

2013 ◽  
Vol 577-578 ◽  
pp. 245-248 ◽  
Author(s):  
Tomasz Brynk ◽  
Barbara Romelczyk ◽  
Anatolii Laptiev ◽  
Oleksandr Tolochyn ◽  
Zbigniew Pakiela
Keyword(s):  
Growth Rate ◽  
Fatigue Crack ◽  
Crack Growth Rate ◽  
Fatigue Crack Growth ◽  
Crack Growth ◽  
Crack Tip ◽  
Mechanical Tests ◽  
Image Correlation ◽  
Contact Method ◽  
The Impact

The paper presents the results of fatigue crack growth rate test of iron sinters. The samples were produced by means of the impact sintering. Applied production method allowed to obtain dense sinters with fine grain size resulted from large shear strains. Due to the limited size of the final products the mechanical tests were carried out in mini-samples. Optical, non-contact method of displacement measurement, namely Digital Image Correlation (DIC), was applied for determination of the displacement fields near the crack tip at the maximal force of selected loading cycles. The results of DIC measurement were utilized in the calculations of stress intensity factors and crack tip coordinates by means of the iterative procedure based on inverse method. These parameters were used for measuring crack development rate. There were investigated two types of materials produced by the consolidation of two different kinds of Fe powders and sintered in different temperatures. The results of crack growth rate tests were correlated with the microstructure changes, as well as yield and ultimate strength of the materials.

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