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The elastic fastenings are elastic fastenings, which exert the buckle pressure on the track through the bending and distortion of the elastic fastenings, and ensure the reliable connection between the rails for a long time. Common elastic fastenings include type I, Type II and Type III, all of which aim to maintain the integrity of the track as much as possible, prevent the rail from moving horizontally and vertically relative to the sleeper, and ensure the normal gauge, so as to ensure the safety of rail vehicles.
elastic fastenings work under repeated alternating stresses and have many functions such as bending, torsion, fatigue and corrosion. When there is a vehicle on the track, it needs to withstand a high instantaneous impact load, so the performance requirements of elastic fastenings are very strict. In addition, because the contact between the wheel and the rail on the track is rigid contact, it will inevitably produce vibration, and the special elastic structure of the elastic bar can absorb the impact energy generated when the vehicle passes by, achieve the role of shock absorption, making the vehicle run more stable and safer. Because there are many models of elastic strips, different models will have differences in inspection items and methods.
The elastic fastenings test items include: form size, mark and factory label, appearance, crack, hardness, metallographic structure, total decarburization layer, residual deformation, buckle pressure, fatigue performance, and rust resistance. Among them, the form size includes the specific items such as the elastic range, arch height, width at the place of nails/bolts, width of two limbs, middle width, small middle diameter, small tail diameter, width at the front arc diameter, warp Angle, contact length of the straight section of both sides of the limbs, etc.
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