Head-checking inspection

Project description:
Examination of head-check type cracks in the railheads on main tracks

Project starting and ending dates:
2003.02.01 - 2005.01.31.

Project reg. nr.:
MUNKA-00001/2002.

Supporting organisation:
Ministry of Education

Assisting organisation:
Research – development Tender Management and Research Exploitation Office (KPI)

Project summary:
With increased rail traffic at higher speeds and with heavier axle loads, head-check type cracks emerge at gauge corner of railheads on main tracks. Considering high frequency of railroad traffic, railhead cracks may expand to fracture of the rail due to rolling contact fatigue (RCF). Tragic evidences of relationship between head-checks and broken rail due to RCF are some railroad accidents with many victims in Western Europe. Remember tragedy in Paddington (UK) in 1999 and Hatfield in 2000. According to assessment of railway experts, accidents were traced back to head-check type cracks. According to project aim we developed a meter device to detect cracks (fissures) in the railhead. The device is able to measure mechanical stress in rails helping to classify cracks, thus contributes to effective planning of railway maintenance (i.e. as a tool for exact order timing and determination of extent of rail grinding).

Head-checking repedésmérő készülék vasúti pályában      Head-checking repedésmérő készülék vasúti pályában

A készülék szondatartókocsija      A műszer mérőprogramja