Side wear of outer rail on curves and the deterioration of lateral stress in fasteners
Q1: Why does side wear of the outer rail aggravate the lateral force of clips?
A1: Side wear changes the head profile of the rail, worsens the wheel guiding effect, and increases the lateral impact. The outward offset trend of the rail is enhanced, the clip bears greater lateral force, the stress level rises significantly, and fatigue accelerates.
Q2: How does the decrease of fastener lateral resistance further promote side wear?
A2: After the lateral restraint of clips, gauge blocks, spikes and other parts is weakened, the rail is more likely to move laterally and incline under wheel load, the gauge widens, the wheel-rail contact point shifts, forming eccentric wear, and the side wear rate increases exponentially.
Q3: Why does the clip fracture rate increase significantly in sections with severe side wear?
A3: Side wear is accompanied by severe lateral vibration and impact. Clips are in a long-term state of high stress and large deformation, the root stress concentration is serious, and micro-cracks propagate rapidly, so the number of fractures is much higher than that in normal straight sections.
Q4: Why is the wear of gauge blocks particularly prominent in side wear sections?
A4: The rail continuously squeezes the block outward, the contact surface slides under high stress, and with the effect of iron powder abrasive particles, the working surface of the block quickly wears and thins, the support capacity decreases, further aggravating rail lateral movement and side wear.
Q5: How to slow down curve side wear through fastener strengthening measures?
A5: Adopt special high-clamping-force curve clips, add gauge tie rods to improve lateral stiffness; select wear-resistant gauge blocks; strengthen the retightening frequency to maintain stable restraint; cooperate with rail oiling to reduce wheel-rail friction and delay the development of side wear from various aspects.