4B3 Shear Mode Fatigue Crack Growth Test and Development of the Testing Machine

2013 ◽  
Vol 2013 (0) ◽  
pp. 63-64
Author(s):  
Kiyotaka MUNAOKA ◽  
Saburo OKAZAKI ◽  
Keiji YANASE
Keyword(s):  
Fatigue Crack ◽  
Fatigue Crack Growth ◽  
Crack Growth ◽  
Testing Machine ◽  
Shear Mode ◽  
Growth Test ◽  
Fatigue Crack Growth Test

OS0711 On Shear Mode Fatigue Crack Growth Test

2011 ◽  
Vol 2011 (0) ◽  
pp. _OS0711-1_-_OS0711-3_
Author(s):  
Masahiro Endo ◽  
Atsushi Kusaba ◽  
Saburo Okazaki ◽  
Keiji Yanase ◽  
Shigeaki Moriyama ◽  
...  
Keyword(s):  
Fatigue Crack ◽  
Fatigue Crack Growth ◽  
Crack Growth ◽  
Shear Mode ◽  
Growth Test ◽  
Fatigue Crack Growth Test

DESIGNING OF A TESTING MACHINE FOR SHEAR-MODE FATIGUE CRACK GROWTH

2012 ◽  
Vol 06 ◽  
pp. 318-323
Author(s):  
A. KUSABA ◽  
S. OKAZAKI ◽  
M. ENDO ◽  
K. YANASE
Keyword(s):  
Fatigue Crack ◽  
Fatigue Crack Growth ◽  
Crack Growth ◽  
High Performance ◽  
Fatigue Testing ◽  
Testing Machine ◽  
Shear Mode ◽  
Mode Iii ◽  
Research Activity ◽  
Testing Speed

As recognized, flaking-type failure is one of the serious problems for railroad tracks and bearings. In essence, flaking-type failure is closely related to the growth of the shear-mode (Mode-II and Mode-III) fatigue crack. In our research group, it is demonstrated that a shear-mode fatigue crack can be reproduced for cylindrical specimens by applying the cyclic torsion in the presence of the static axial compressive stress. However, a biaxial servo-hydraulic fatigue testing machine is quite expensive to purchase and costly to maintain. The low testing speed (about 10Hz) of the testing machine further aggravates the situation. As a result, study on shear-mode fatigue crack growth is still in the nascent stage. To overcome the difficulties mentioned above, in this research activity, we developed a high-performance and cost-effective testing machine to reproduce the shear-mode fatigue crack growth by improving the available resonance-type torsion fatigue testing machine. The primary advantage of using the resonance-type torsion fatigue testing machine is cost-efficiency. In addition, the testing speed effectively can be improved, in comparison with that of a biaxial servo-hydraulic fatigue testing machine. By utilizing the newly-designed testing machine, we have demonstrated that we can successfully reproduce the shear-mode fatigue crack.

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