fatigue life

简明释义

疲劳寿命

英英释义

例句

1.The engineer calculated the fatigue life of the bridge to ensure its safety over time.

工程师计算了桥梁的疲劳寿命以确保其长期安全。

2.A longer fatigue life means that the product will last longer under cyclic loading.

更长的疲劳寿命意味着产品在循环载荷下会持续更长时间。

3.Understanding the fatigue life of materials is crucial in aerospace engineering.

理解材料的疲劳寿命在航空航天工程中至关重要。

4.The fatigue life of a metal can be significantly affected by its microstructure.

金属的疲劳寿命可能会受到其微观结构的显著影响。

5.Manufacturers often test the fatigue life of components before mass production.

制造商通常在大规模生产之前测试组件的疲劳寿命。

作文

In the field of engineering and materials science, the term fatigue life refers to the duration or number of cycles a material can withstand before failure due to repeated loading and unloading. This concept is crucial in designing components that will be subjected to cyclic stresses, such as those found in bridges, aircraft, and machinery. Understanding fatigue life helps engineers predict when a material will fail and allows for safer and more efficient designs.The fatigue life of a material is influenced by several factors, including the type of material, the magnitude of stress applied, the environment in which the material operates, and the presence of flaws or imperfections in the material. For instance, metals generally have a different fatigue life compared to polymers or ceramics due to their unique microstructures and mechanical properties. Engineers often conduct tests to determine the fatigue life of materials under controlled conditions, allowing them to gather data that can inform design choices.One of the most important aspects of fatigue life is its relationship with stress cycles. The S-N curve, or Wöhler curve, is a graphical representation that shows the relationship between the cyclic stress amplitude and the number of cycles to failure. By analyzing this curve, engineers can estimate the fatigue life of a material under various loading conditions. A higher stress level typically results in a shorter fatigue life, while lower stress levels can extend the life of the material significantly.Moreover, environmental factors can also play a significant role in determining fatigue life. For example, exposure to corrosive environments can lead to stress corrosion cracking, which can drastically reduce the fatigue life of a component. Therefore, it is essential for engineers to consider not only the mechanical loading but also the operational environment when assessing the fatigue life of materials.To enhance the fatigue life of components, engineers may employ various strategies, such as surface treatments, material selection, and design modifications. Surface hardening techniques like shot peening can introduce compressive stresses on the surface of a material, which helps to counteract tensile stresses that contribute to fatigue failure. Additionally, selecting materials with higher inherent fatigue life can lead to longer-lasting components.In conclusion, the concept of fatigue life is vital in engineering applications where materials are subjected to cyclic loading. By understanding the factors that influence fatigue life, engineers can make informed decisions that enhance the safety and durability of structures and components. As technology advances, the methods for predicting and improving fatigue life continue to evolve, leading to safer and more reliable designs in various industries.

在工程和材料科学领域，术语fatigue life指的是材料在重复加载和卸载过程中能够承受的持续时间或循环次数，直到发生故障。这个概念对于设计将受到循环应力影响的组件至关重要，如桥梁、飞机和机械设备。理解fatigue life有助于工程师预测材料何时会失效，从而使设计更加安全和高效。材料的fatigue life受多个因素的影响，包括材料类型、施加的应力大小、材料运行的环境以及材料中缺陷或不完美的存在。例如，金属的fatigue life通常与聚合物或陶瓷不同，因为它们具有独特的微观结构和机械性能。工程师通常进行测试，以确定材料在控制条件下的fatigue life，从而收集可以为设计选择提供信息的数据。fatigue life的一个重要方面是它与应力循环之间的关系。S-N曲线或Wöhler曲线是一种图形表示，显示了循环应力幅度与破坏前循环次数之间的关系。通过分析这条曲线，工程师可以估计材料在各种加载条件下的fatigue life。更高的应力水平通常导致较短的fatigue life，而较低的应力水平则可以显著延长材料的寿命。此外，环境因素也可能对fatigue life产生重大影响。例如，暴露于腐蚀性环境中可能导致应力腐蚀开裂，这可能会极大地降低组件的fatigue life。因此，工程师在评估材料的fatigue life时，必须考虑机械加载和操作环境。为了增强组件的fatigue life，工程师可能采用各种策略，如表面处理、材料选择和设计修改。表面硬化技术如喷丸处理可以在材料表面引入压应力，有助于抵消导致疲劳失效的拉应力。此外，选择具有更高固有fatigue life的材料可以导致更持久的组件。总之，fatigue life的概念在材料受到循环加载的工程应用中至关重要。通过理解影响fatigue life的因素，工程师可以做出明智的决策，从而提高结构和组件的安全性和耐用性。随着技术的发展，预测和改善fatigue life的方法不断演变，导致各个行业设计的安全性和可靠性更高。