scholarly journals Crack Propagation in the Spur Gear of Tubler Gear Mechanism of Lathe Machine

2020 ◽  
Vol 13 (3) ◽  
Author(s):  
M. A. Mohite ◽  
B. S. Kothavale
Keyword(s):  
Service Life ◽  
Crack Propagation ◽  
Experimental Test ◽  
Crack Path ◽  
Crack Propagation Rate ◽  
Spur Gear ◽  
Life Cycles ◽  
Fatigue Crack Propagation Rate ◽  
Lathe Machine ◽  
Gear Mechanism

An estimation of the spur gear service life and crack path analysisis proposed in this paper. Ip theory using numerical solution is used to find the fatigue crack propagation rate, service life, and crack path due to bending fatigue. A spur gear of tumbler gear mechanism of lathe machine, is implemented for this analysis. An experimental test on gear specimens was carried out to analyze the crack propagation due to fatigue. Besides, service life estimated by the theory was compared with the most common Paris law. Hence further, extended finite element approach (Ansys)is implemented for the simulation of gear crack propagation trajectory. The simulation results are verified with experimental test. The service life and crack trajectory of the gear is obtained with ‘Ip’ theory and found in good agreement with experiment.In overall, this study signifies the gear failure prediction methodology during crack propagation in respect of life cycles and trajectory path.

Test Stand for Analysis of Fatigue Crack Propagation under Bending with Torsion

2008 ◽  
Vol 144 ◽  
pp. 90-93 ◽  
Author(s):  
Grzegorz Gasiak ◽  
Grzegorz Robak
Keyword(s):  
Fatigue Crack ◽  
Crack Propagation ◽  
Fatigue Crack Propagation ◽  
Digital Camera ◽  
Crack Propagation Rate ◽  
Propagation Rate ◽  
Test Stand ◽  
Crack Development ◽  
Fatigue Crack Propagation Rate ◽  
Fatigue Crack Development

The paper presents a test stand for measurements of fatigue crack propagation. The stand includes a fatigue machine MZGS–100 and a device for registration of the crack length. The test stand is equipped with a stereoscopic microscope with fluent magnification of 7× – 67.5×. The microscope can be applied for observation of fatigue crack development. The microscope is also equipped with a digital camera, which enables continuous observation of fatigue crack development on the computer monitor and it is not necessary to stop the machine. The test results obtained at this stand can be used for determination of fatigue life and fatigue crack propagation rate.

Numerical Investigations of Corner Singularities in Cracked Bodies

2007 ◽  
Vol 348-349 ◽  
pp. 377-380 ◽  
Author(s):  
Pavel Hutař ◽  
Luboš Náhlík ◽  
Zdeněk Knésl
Keyword(s):  
Fatigue Crack ◽  
Free Surface ◽  
Crack Propagation ◽  
Fatigue Crack Propagation ◽  
Three Dimensional ◽  
Stress Singularity ◽  
Crack Propagation Rate ◽  
Propagation Rate ◽  
Dimensional Structure ◽  
Fatigue Crack Propagation Rate

The influence of corner singularity on the distribution of the stresses around the crack front for a three-dimensional structure is described in this paper. The distribution of stress singularity through the thickness of the middle tension specimen provides us an indication of crack behaviour close to a free surface. An estimation of the region where the change of singularity exponent plays an important role in fatigue crack propagation rate was carried out. A decrease in fatigue crack propagation rate close to the free surface was found. The lower fatigue crack propagation rate in the boundary layer in comparison with the interior of the specimen leads to a change of intersecting angle between crack and free surface and depends on Poisson’s ratio.

Sign in / Sign up

Export Citation Format

Share Document