Failure Analysis of a Hammer Drill Shaft under Complex Loading Paths and Severe Environmental Conditions

Priya A. Manohar

doi:10.4028/www.scientific.net/MSF.638-642.3889

Paper Titles

Effect of Parameters of Notch on Fatigue Life of Shaft Based on Product Lifecycle Management
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Predication of Fatigue Life of Notched Torus under Random Scan Vibration
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The Structure and its Dependence on the Magnetic Properties of Ni₅Co_XCu_95-X Alloys Produced by Mechanical Alloying and Subsequent Annealing
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Thermomechanical Process Innovation via Computer Modeling and Simulation
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Failure Analysis of a Hammer Drill Shaft under Complex Loading Paths and Severe Environmental Conditions
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Fracture Process of Aluminum/Aluminum Nitride Interfaces during Thermal Cycling
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Metallurgical Investigation on Low Ductility Failures of Cu-ETP Components
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Grain Boundary Pinning by Particles
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On the Effects Associated with Control Parameters Delay during Biaxial Cyclic Loading of Engineering Materials
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HomeMaterials Science ForumMaterials Science Forum Vols. 638-642Failure Analysis of a Hammer Drill Shaft under...

Failure Analysis of a Hammer Drill Shaft under Complex Loading Paths and Severe Environmental Conditions

Abstract:

This paper describes the failure investigation of a tubular shaft that is part of a hammer drill assembly. The failure investigation was particularly challenging as the fracture surfaces were completely damaged during and subsequent to the failure process. However, careful examination of the component and its assembly revealed many clues that pointed to the root causes of failure. It was determined that the shaft was subjected to impact, fatigue, bending and torsional loads simultaneously at elevated temperatures. The basic failure mode was identified as a combination of torsional fatigue and rotating bending fatigue failure that originated on the inside diameter of the shaft. The root causes were determined to be operational overload in combination with rough machining marks on the bore surface and higher than necessary operating torque required to overcome the dry adhesive friction in the system. The preventative measures recommended were many-fold including improving surface finish on the bore diameter, reducing dry sliding friction, decreasing the overall level of dynamic loads by appropriate design changes and adding a surface strengthening heat treatment

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Periodical:

Materials Science Forum (Volumes 638-642)

Pages:

3889-3894

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.638-642.3889

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Online since:

January 2010

Authors:

Priya A. Manohar

Keywords:

Hammer Drill, Machining Marks, Rotating Bending Fatigue, Torsional Fatigue

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References

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