STEM与日常科技·英语30篇（6）

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碳纤维自行车车架如何兼顾强度与弹性

Carbon fiber frames are built by layering thin sheets of resin-impregnated fibers onto a mold shaped like a bicycle frame.
Engineers orient each ply at specific angles—0°, 45°, or 90°—to control stiffness, torsional rigidity, and vibration absorption.
Vertical flex in the seat stays cushions bumps without sacrificing pedaling efficiency, thanks to strategic fiber layup.
Torsional stiffness around the bottom bracket ensures power transfers directly to the rear wheel during hard sprints.
Unlike aluminum or steel, carbon doesn’t fatigue suddenly; instead, damage accumulates slowly and shows as surface cracks or delamination.
Non-destructive testing like ultrasonic scanning checks for hidden voids or resin inconsistencies before shipping.
Riders choose frames based on ride quality profiles—endurance models prioritize comfort, while race versions maximize responsiveness.
Recycling remains challenging, but new chemical processes now recover up to 95% of carbon fiber for reuse in lower-grade composites.
Designers use finite element analysis software to simulate stresses from potholes, jumps, and braking forces before prototyping.
This fusion of materials science, mechanical engineering, and human-centered design creates lightweight, responsive, and durable machines.