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实际使用中的光纤，它对于常见机械应力和化学作用的承受能力，受到短期效应和长期效应两方面的影响。短期效应包括裂纹大小与分布，涂层的化学性质和厚度，这取决于光纤的制造工艺、制造环境和产品技术要求。长期效应则是随着时间推移使光纤机械强度下降的因素，它与施加的应力和光纤可受的化学作用有关。筛选试验是确保光纤使用寿命的的一种方法；在特定化学环境下测量光纤的耐疲劳因素，则是确定光纤长期机械可靠性的质量因素。
Optical fiber in actual use, which is able to withstand common mechanical and chemical stresses, is affected by both short-term and long-term effects. Short-term effects include crack size and distribution, chemical nature and thickness of the coating, depending on the fiber’s manufacturing process, manufacturing environment, and product specifications. The long-term effect is a factor that decreases the mechanical strength of an optical fiber over time, and it is related to the applied stress and the chemical action that the optical fiber can withstand. Screening tests are one way to ensure the useful life of a fiber; measuring the fatigue resistance of a fiber in a specific chemical environment is a quality factor that determines the long-term mechanical reliability of the fiber.