A new approach for pre-stressing of rail-end-bolt holes

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21340%2F17%3A00325071" target="_blank" >RIV/68407700:21340/17:00325071 - isvavai.cz</a>

Result on the web

<a href="https://journals.sagepub.com/doi/abs/10.1177/0954406216630003?journalCode=picb" target="_blank" >https://journals.sagepub.com/doi/abs/10.1177/0954406216630003?journalCode=picb</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1177/0954406216630003" target="_blank" >10.1177/0954406216630003</a>

Result language

angličtina

Original language name

A new approach for pre-stressing of rail-end-bolt holes

Original language description

Bolted joint railroad is the subject matter of this paper. Rail joint elements are subjected to cyclic and impact loads as a result of the passage of trains, which causes the origination and growth of fatigue cracks occurring, in most cases, around the bolt holes. Fatigue failure around rail-end-bolt holes is particularly dangerous because it leads to derailment of trains and, consequently, to inevitable accidents. Moreover, the cracking at rail-ends, which starts from bolt hole surface, causes premature rails replacement. The presence of residual compressive hoop stresses around the bolted holes, which is achieved by prestressing of these holes, extends the fatigue life of bolted joint railroads. This article presents an innovative technology for pre-stressing of rail-end-bolt holes, implemented on a vertical machining centre of Revolver vertical (RV) type. Two consecutive operations are involved in the manufacturing technology process: formation of the hole by drilling, reaming and making of a chamfer through a new combined cutting tool; cold hole working by spherical motion cold working through a new tool equipment, which minimizes the axial force on the reverse stroke. The new technology introduces beneficial residual compressive stresses around the bolted holes thereby preventing the fatigue cracks growth and increasing the fatigue life of these openings.

Czech name

—

Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

20501 - Materials engineering

Project

—

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2017

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Proceedings of Institution of Mechanical Engineers Part C: Journal of Mechanical Engineering Science

ISSN

0954-4062

e-ISSN

2041-2983

Volume of the periodical

231

Issue of the periodical within the volume

12

Country of publishing house

GB - UNITED KINGDOM

Number of pages

9

Pages from-to

2275-2283

UT code for WoS article

000403446500009

EID of the result in the Scopus database

2-s2.0-85020544307