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TB/T 3396.4-2015 English PDF (TBT3396.4-2015)

TB/T 3396.4-2015 English PDF (TBT3396.4-2015)

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TB/T 3396.4-2015: Test methods for fastening systems of high-speed railway - Part 4: Test of fatigue performance of fastening assembly

This Part specifies the indoor test methods for fatigue performance of fastening assembly. This Part applies to the fastening systems of high-speed railway.
TB/T 3396.4-2015
TB
RAILWAY INDUSTRY STANDARD
OF THE PEOPLE REPUBLIC OF CHINA
ICS 45.080
S 12
Test Methods for Fastening Systems of High ?€?
Speed Railway - Part 4. Test of Fatigue Performance of
Fastening Assembly
ISSUED ON. JULY 15, 2015
IMPLEMENTED ON. FEBRUARY 1, 2016
Issued by. National Railway Administration of the PEOPLE Republic of
China
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative References ... 4
3 Symbols ... 4
4 Principle ... 5
5 Test Parameters ... 5
6 Test Equipment ... 6
7 Test Pieces ... 7
8 Test Method for a Single Rail... 7
9 Alternative Test Method ... 11
10 Final Inspection ... 13
11 Test report ... 14
Foreword
TB/T 3396 " Test Methods for Fastening Systems of High-speed Railway" is divided into seven parts.
-- Part 1. Determination of Lateral Resistance of Steel Rails;
-- Part 2. Determination of Assembly Fastening Pressure;
-- Part 3. Determination of Static Stiffness of Assembly;
-- Part 4. Test of Fatigue Performance of Fastening Assembly;
-- Part 5. Determination of Insulation Resistance;
-- Part 6. Effects of Adverse Environmental Conditions;
-- Part 7. Pulling Resistance Test of Embedded Parts.
This Part is Part 4 of TB/T 3396.
This Part was drafted according to the rules given in GB/T 1.1-2009.
This Part shall be under the jurisdiction of China Academy of Railway Sciences Standards and Metrology Research Institute.
Drafting organization of this Part. China Academy of Railway Sciences Railway Engineering Research Institute.
The main drafters of this Part. Zhao Rukang, Xiao Junheng, Fang Hangwei, Xu Shaohui and Li Zirui.
Test Methods for Fastening Systems of High ?€?
Speed Railway - Part 4. Test of Fatigue Performance of
Fastening Assembly
1 Scope
This Part specifies the indoor test methods for fatigue performance of fastening assembly.
This Part applies to the fastening systems of high-speed railway.
2 Normative References
The following documents are essential to the application of this standard. For the dated references, only the dated editions are applicable to this standard. For the undated references, their latest editions (including all amendments) are applicable to this standard.
TB/T 3396.1 Test Methods for Fastening Systems of High-speed Railway - Part 1. Determination of Lateral Resistance of Steel Rails
TB/T 3396.2 Test Methods for Fastening Systems of High-speed Railway - Part 2. Determination of Assembly Fastening Pressure
TB/T 3396.3 Test methods for fastener systems of high-speed railway - Part 3. Determination of Static Stiffness of Assembly
3 Symbols
The following symbols apply to this document.
??. The included angle between load action line and vertical line of rail bottom, in degree (??);
PL. The maximum load component of a single bearing surface parallel to the bottom surface of rail, in kN;
PV. The maximum load component of a single bearing surface perpendicular to the bottom surface of rail, in kN;
T1. The relative distance of rail head to the fixed point of sleeper before fatigue test, in mm;
100 mm ?? 10 mm; the radius of its contacting part with rail head is more than the arc radius of rail head contacting surface, in order to maintain its linear contact with steel rail under all loading conditions.
6.6 Displacement sensor
The instrument measuring the vertical displacement and horizontal displacement of steel rail relative to sleeper, its indication error is 1.01 mm.
6.7 Load sensor
The instrument measuring the load applied on steel rail or loading frame, its accuracy is class I.
7 Test Pieces
7.1 Sleeper
The sleeper, ??-sleeper or slab rail element that has fastener embedded parts or reserved holes (all named sleeper in the test method). The bearing surface of sleeper shall not be trimmed for the test. When the fastener embedded parts or reserved holes are not symmetrical relative to the lateral centerline of sleeper, use two or two ??- sleepers for the test.
7.2 Fastener
A complete set of fastener that includes all components.
8 Test Method for a Single Rail
8.1 General
The test method for single rails is applicable to the test in which a single rail is fixed to one end of sleeper or a half sleeper with fasteners. No adjustment, re-screwing or trimming of fastening assembly shall be made during the test.
8.2 Test procedure
8.2.1 Fasteners arranged on the lateral centerline of sleeper
If the fasteners are arranged symmetrically on the lateral centerline of sleeper, assembly according to relevant product requirements, then use fasteners to fix a short rail about 0.5 m long to the bearing surface of sleeper, and then conduct the test according to the sequence in 8.3, 8.4, 8.5, 8.6 and 8.7.
8.2.2 Fasteners staggered in arrangement
aside for 24 h. assembly static rigidity (see 8.5), rail vertical resistance (see 8.4), and assembly fastening pressure (see 8.3).
9 Alternative Test Method
9.1 General
The alternative test method is applicable to the test in which the fastening system is used to fix two rails on one or two sleepers. No adjustment, re-screwing or trimming shall be made for the fastening assembly during the test.
9.2 Test procedure
9.2.1 Fasteners arranged on the vertical centerline of sleeper
If the fasteners are arranged symmetrically on the vertical centerline of sleeper, assembly according to relevant product requirements, then use fasteners to fix two short rails about 0.5 m long to the bearing surface of sleeper; conduct the test according to the sequence in 9.3, 9.4, 9.5, 9.6 and 9.7.
9.2.2 Fasteners staggered in arrangement
If the fasteners are staggered in arrangement, assembly according to relevant product requirements, then use fasteners to fix one end of two short rails about 1 m long to the bearing surfaces of sleeper A; conduct the test for the fasteners on the two bearing surfaces according to the sequence in 9.3, 9.4 and 9.5; use fasteners to fix the other end of the two rails to two bearing surfaces of sleeper B, as shown in Figure 7. Conduct the test of 9.6 after fixing; disassemble the fasteners on sleeper B after the test; and conduct the test of 9.7 for the fasteners on sleeper A. During the process of fixing and disassembling the fasteners on sleeper B, no disturbance shall be produced on the fasteners on sleeper A.
Figure 7 Arrangement of Test Sleepers When the Fasteners Are Staggered in Arrangement
9.3 Assembly fastening pressure
Determine the assembly fastening pressure of fasteners according to the method in Figure 5; the distance between two bearing surfaces shall be as small as possible; the load shall be distributed equally on two bearing surfaces.
Apply load slowly on the test assembly system to the maximum load; load to 2 times of the maximum load if the fasteners are staggered; the loading rate is not more than 200 kN/min for a single sleeper; the loading rate is not more than 400 kN/min for two sleepers. Repeat loading for 10 times; during the last 3 times of loading, the error of the included angle ?? between maximum loading action line and rail bottom vertical line shall be within ??0.5??.
Apply cyclic load on the test assembly system, from the minimum 9 kN (for a single sleeper) or 18 kN (for two sleepers) to the maximum load 2PV (the maximum load 4PV for two sleepers), loading frequency is 3 Hz ~ 5 Hz. Within the last 100 cycles of the first 1 000 cycles, record the dynamic displacement of 10 cycles of rail relative to sleeper (as shown in Figure 6, the rail vertical displacement shall be perpendicular to rail bottom surface and distributed uniformly around fasteners; the lateral displacement of rail head shall be in-parallel to rail bottom surface and distributed equally on both sides of fasteners); take the average value as the dynamic displacement amount (the vertical displacement of rail is the average value of the 4 displacement sensors; the lateral displacement of rail head is the average value of the 2 displacement sensors). Remove load after finishing 1 000 loading cycles; measure the gauge (measure both sides of fasteners separately; take the average value as the test value); record it as the initial gauge G1; re-measure the gauge 4 h after removing load after 3??106 loading cycles; record it as the gauge after fatigue G2; the gauge widening ??G = G2-G1. In the fatigue test, when the maximum surface temperature of the components reaches 50???, use a fan for cooling, or reduce slightly the loading frequency within 3 Hz ~ 5 Hz, or suspend loading for the time being or take other measures.
9.7 Repeated test
After 10??106 loading cycles, remove load; all fastening components used for the test are placed aside for 24 h; ...

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