Strength estimation of the impact zone — A critical area of the tools of the hydraulic hammers

The hydraulic hammers are subjected to the impact loads, under which the elements of the tools can fail. The basic cause for this is the stress concentration in the critical contact areas and negative effects of environmental conditions - such as low temperatures, high humidity, or presence of salt....

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Bibliographic Details
Published in:Archives of Civil and Mechanical Engineering 2016-09, Vol.16 (4), p.767-776
Main Authors: Sokolski, Marek, Sokolski, Piotr
Format: Article
Language:English
Subjects:
Civil Engineering
Contact stresses
Engineering
Hammers
Impact loads
Impact velocity
Low temperature
Mechanical Engineering
Original Research Article
Safety factors
Stress concentration
Structural Materials
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Summary:The hydraulic hammers are subjected to the impact loads, under which the elements of the tools can fail. The basic cause for this is the stress concentration in the critical contact areas and negative effects of environmental conditions - such as low temperatures, high humidity, or presence of salt. The particular critical area of the tools of the hydraulic hammers is the impact zone, which defines a limit of maximum impact velocity and blow energy of the piston. Taking this into consideration, the analysis of the stresses generated by impact on the contact surface of the tool was carried out. On this basis the realized as well as the required values of the safety factor for the impact zone were estimated as well and allowable impact velocity was determined which was conditioned by the strength of both the piston and the tool.
ISSN:1644-9665
2083-3318
DOI:10.1016/j.acme.2016.04.007