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Laboratory test standards for assessment of rail fastening system performance David Rhodes, PhD - Pandrol Ltd., UK Bob Coats, P.E. - Pandrol USA.

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Presentation on theme: "Laboratory test standards for assessment of rail fastening system performance David Rhodes, PhD - Pandrol Ltd., UK Bob Coats, P.E. - Pandrol USA."— Presentation transcript:

1 Laboratory test standards for assessment of rail fastening system performance David Rhodes, PhD - Pandrol Ltd., UK Bob Coats, P.E. - Pandrol USA

2 Rail Fastening System Qualification Tests Europe – CEN (EN ) Japan – Railway Technical Research Institute (RTRI) North America – AREMA (Ch. 30) Global Influence (Australia, Africa + others)

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4 TESTCENAREMASubject No. Longitudinal Rail RestraintYes 2 TorsionYes 4 Attenuation of impact loadsYes 3 Repeated Load TestYes 5 Electrical ResistanceYes 1 Severe (Corrosive) EnvironmentsYesNo Wet & Abrasive EnvironmentsNoYes5 Clamping ForceYes 2 Insert PulloutYes Rail Pad Dynamic StiffnessYesNo Vertical StiffnessYes 3 Lateral RestraintNoYes Rail UpliftNoYes Dimensional AssessmentYesNo

5 Electrical Testing

6 Electrical Test Requirements CEN: 5 kΩ Resistance minimum After water spray, corrected for resistivity AREMA: 10 kΩ Impedance minimum After submerged soak

7 Clamping Force (of rail clips)

8 Determination of Clamping Force BS EN :2002

9 Longitudinal Restraint

10 Determination of Longitudinal Rail Restraint BS EN :2002

11 Longitudinal Restraint CEN: Pull to slip, 7 kN (1,574 lb.) minimum AREMA: 2,400 lb. (10.7 kN) without slip

12 Vertical Stiffness

13 Determination of Vertical Stiffness BS EN :2002

14 Determination of Attenuation of Impact loads EN :2002

15 Torsion

16 Determination of Torsional Resistance BS EN :2002

17 Repeated Load Test

18 Repeated Load Test - Purpose Pre Repeated Load Test Series Clamping Force Longitudinal Rail Restraint Vertical Stiffness Repeated Load Test Post Repeated Load Test Series Clamping Force Longitudinal Rail Restraint Vertical Stiffness

19 Repeated Load Test – Track Data

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21 Goal: Match Repeated Load Test to Rail Life Rail Life in Track? Track MGT per Year Years to 3 BGT Years to 1 BGT Laboratory Test Calculating number of test cycles to correspond to 3 BGT /MGT Car Weight Axle Load Wheel Load Railseat Load (assuming 1/2 wheel load on railseat) In theory, four 20 kip load cycles equates to one 315,000 lb. car One MGT equates to6349carsor25397cycles Three BGT equates to cyclesor 76.2 million cycles Repeated Load testing at 3.5 Hz, seconds of testing is required 6047hours252days36weeks 8.4Monthsrunning 24/7

22 136RE 20kip Lateral Load Typical Rail Clip Loads

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25 Instructions for the Cyclic Loading on an Assembly EN :2002

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27 Repeated Load test to RTRI Standards (Japan)

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29 AREMACEN Fmax (2) Kips (kN) Fmin Angle α Deg L / V Ratio Fmax Kips (kN) Fmin Angle α Deg L / V Ratio Light Rail 12 (55) 1 (5) Gen Freight / Transit30 (133)-3.3 (15)20 17 (75)1 (5) Heavy Haul32.5 (145)1 kip lateral (83)1 (5)330.65

30 Laboratory test standards for assessment of rail fastening system performance David Rhodes, PhD - Pandrol Ltd., UK Bob Coats, P.E. - Pandrol USA


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