scholarly journals Theoretical and Experimental Study of Strain Localization and Energy Dissipation at Fatigue Crack Tip

2014 ◽  
Vol 3 ◽  
pp. 1020-1025 ◽  
Author(s):  
O. Plekhov ◽  
A. Fedorova ◽  
A. Kostina ◽  
I. Panteleev
Keyword(s):  
Experimental Study ◽  
Fatigue Crack ◽  
Energy Dissipation ◽  
Strain Localization ◽  
Crack Tip

scholarly journals Peculiarities of energy dissipation at a fatigue crack tip in metals

2016 ◽  
Author(s):  
A. Iziumova ◽  
A. Vshivkov ◽  
A. Prokhorov ◽  
A. Kostina ◽  
O. Plekhov
Keyword(s):  
Fatigue Crack ◽  
Energy Dissipation ◽  
Crack Tip

scholarly journals An dissipated energy based analysis of fatigue crack propagation law

2019 ◽  
Vol 300 ◽  
pp. 11009
Author(s):  
Aleksei Vshivkov ◽  
Anastasiia Iziumova ◽  
Rustam Yarullin ◽  
Valery Shlyannikov ◽  
Oleg Plekhov
Keyword(s):  
Heat Flux ◽  
Fatigue Crack ◽  
Energy Dissipation ◽  
Cyclic Loading ◽  
Biaxial Loading ◽  
Crack Tip ◽  
Heat Flux Sensor ◽  
Dissipated Energy ◽  
Contact Heat ◽  
Propagation Law

The experimental study of heat flux evolution at the fatigue crack tip during biaxial loading was carry out in this work. The plane samples of stainless steel AISI 304 with thick of 3 mm were weakened by notch to initiate fatigue crack at the centre of samples. A contact heat flux sensor based on the Seebeck effect was used to monitor the dissipated thermal energy. During tests the samples were subjected to cyclic loading of 5 Hz with constant stress amplitude and different biaxial parameter. The experimental results confirm the previous conclusions of authors about two regime of energy dissipation at fatigue crack tip. The curve of the dissipated energy can be divided in two stages. In the second stage is characterized by classical linear relation between crack rate and energy dissipation. In the first stage the crack rate is proportional to the multiplication of the power of heat flux by crack length. The energy dissipation does not depend on the biaxial parameter during cyclic loading.

scholarly journals A model of energy dissipation at fatigue crack tip in metals

2019 ◽  
Vol 13 (48) ◽  
pp. 451-458
Author(s):  
Aleksei Vshivkov ◽  
Oleg Plekhov ◽  
Anastasiia Iziumova ◽  
Balasubramaniam Venkatraman
Keyword(s):  
Fatigue Crack ◽  
Energy Dissipation ◽  
Crack Tip

scholarly journals Structure, processing and performance of ultra-high molecular weight polyethylene (IUPAC Technical Report). Part 4: sporadic fatigue crack propagation

2020 ◽  
Vol 92 (9) ◽  
pp. 1521-1536
Author(s):  
Clive Bucknall ◽  
Volker Altstädt ◽  
Dietmar Auhl ◽  
Paul Buckley ◽  
Dirk Dijkstra ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Fatigue Crack ◽  
Crack Propagation ◽  
High Molecular Weight ◽  
Fatigue Crack Propagation ◽  
Crack Tip ◽  
Individual Growth ◽  
Paris Equation ◽  
Number Of Cycles ◽  
Ultra High Molecular Weight

AbstractFatigue tests were carried out on compression mouldings supplied by a leading polymer manufacturer. They were made from three batches of ultra-high molecular weight polyethylene (UHMWPE) with weight-average relative molar masses, ${\overline{M}}_{\mathrm{W}}$, of about 0.6 × 106, 5 × 106 and 9 × 106. In 10 mm thick compact tension specimens, crack propagation was so erratic that it was impossible to follow standard procedure, where crack-tip stress intensity amplitude, ΔK, is raised incrementally, and the resulting crack propagation rate, da/dN, increases, following the Paris equation, where a is crack length and N is number of cycles. Instead, most of the tests were conducted at fixed high values of ΔK. Typically, da/dN then started at a high level, but decreased irregularly during the test. Micrographs of fracture surfaces showed that crack propagation was sporadic in these specimens. In one test, at ΔK = 2.3 MPa m0.5, there were crack-arrest marks at intervals Δa of about 2 μm, while the number of cycles between individual growth steps increased from 1 to more than 1000 and the fracture surface showed increasing evidence of plastic deformation. It is concluded that sporadic crack propagation was caused by energy-dissipating crazing, which was initiated close to the crack tip under plane strain conditions in mouldings that were not fully consolidated. By contrast, fatigue crack propagation in 4 mm thick specimens followed the Paris equation approximately. The results from all four reports on this project are reviewed, and the possibility of using fatigue testing as a quality assurance procedure for melt-processed UHMWPE is discussed.

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