permissible stress

简明释义

容许应力

英英释义

例句

1.In construction, it is crucial to adhere to the permissible stress limits to prevent structural failures.

在建筑中，遵守允许应力限制对于防止结构失效至关重要。

2.The permissible stress values are defined in the engineering standards for safety compliance.

在工程标准中定义了允许应力值以确保安全合规。

3.Before proceeding with the design, we must verify the permissible stress for the chosen materials.

在进行设计之前，我们必须验证所选材料的允许应力。

4.The material's permissible stress was tested under various conditions to determine its safety.

材料的允许应力在不同条件下进行了测试，以确定其安全性。

5.The engineer calculated the permissible stress to ensure the bridge could safely support the weight of vehicles.

工程师计算了允许应力以确保桥梁能够安全承载车辆的重量。

作文

In the field of engineering and materials science, understanding the concept of permissible stress is crucial for ensuring the safety and durability of structures. Permissible stress refers to the maximum stress that a material can withstand without experiencing failure or permanent deformation. This value is determined through rigorous testing and analysis, taking into account various factors such as material properties, environmental conditions, and the intended use of the structure.When designing a building or any other structure, engineers must calculate the loads that the structure will be subjected to, including dead loads, live loads, wind loads, and seismic forces. By knowing these loads, they can then determine the appropriate materials and dimensions needed to ensure that the structure can safely support them. The permissible stress plays a vital role in this process, as it helps engineers establish safe limits for the materials used.For example, consider a steel beam used in the construction of a bridge. Engineers will first evaluate the mechanical properties of the steel, such as its yield strength and ultimate tensile strength. From this data, they can derive the permissible stress for the beam, which is typically a fraction of the yield strength to provide a safety margin. This safety factor accounts for uncertainties in material properties, variations in loading conditions, and potential flaws in the material.Using the permissible stress value, engineers can then design the beam to ensure that it will not exceed this limit under expected loads. If the calculated stress on the beam exceeds the permissible stress, it indicates that the design is unsafe and requires adjustments, such as using a stronger material or increasing the beam's dimensions.In addition to structural applications, the concept of permissible stress is also relevant in other fields such as mechanical engineering and aerospace engineering. For instance, in the design of pressure vessels or aircraft components, engineers must consider factors like fatigue, corrosion, and thermal effects, all of which can influence the permissible stress of the materials involved.Moreover, the permissible stress is not a static value; it can change based on the operating conditions and the environment. For example, a material subjected to high temperatures may have a lower permissible stress compared to its performance at room temperature. Similarly, materials exposed to corrosive environments may also experience a reduction in their permissible stress due to degradation over time.In conclusion, the concept of permissible stress is fundamental in the design and analysis of structures and components across various engineering disciplines. By understanding and applying this concept, engineers can ensure that their designs are safe, reliable, and capable of withstanding the demands placed upon them. As technology advances and new materials are developed, the determination and application of permissible stress will continue to evolve, further enhancing the safety and efficiency of engineering practices.

在工程和材料科学领域，理解“permissible stress”这一概念对于确保结构的安全性和耐久性至关重要。“permissible stress”指的是材料在不发生失效或永久变形的情况下能够承受的最大应力。这个值是通过严格的测试和分析确定的，考虑了材料特性、环境条件以及结构的预期使用等各种因素。在设计建筑物或其他结构时，工程师必须计算结构将承受的荷载，包括恒载、活载、风载和地震力。通过了解这些荷载，他们可以确定所需的适当材料和尺寸，以确保结构能够安全地支撑它们。“permissible stress”在这个过程中发挥着至关重要的作用，因为它帮助工程师建立所用材料的安全极限。例如，考虑用于桥梁建设的钢梁。工程师首先会评估钢材的机械性能，例如屈服强度和极限抗拉强度。从这些数据中，他们可以推导出钢梁的“permissible stress”，这通常是屈服强度的一部分，以提供安全余量。这个安全系数考虑了材料性能的不确定性、荷载条件的变化以及材料中可能存在的缺陷。利用“permissible stress”值，工程师可以设计钢梁，以确保在预期荷载下不会超过该极限。如果对钢梁的计算应力超过了“permissible stress”，这表明设计不安全，需要进行调整，例如使用更强的材料或增加钢梁的尺寸。除了结构应用外，“permissible stress”的概念在机械工程和航空航天工程等其他领域也很相关。例如，在压力容器或飞机部件的设计中，工程师必须考虑疲劳、腐蚀和热效应等因素，这些因素都可能影响所涉及材料的“permissible stress”。此外，“permissible stress”并不是一个静态值；它可以根据操作条件和环境而变化。例如，处于高温下的材料可能具有比室温下性能低的“permissible stress”。同样，暴露于腐蚀环境中的材料也可能由于随时间的降解而降低其“permissible stress”。总之，“permissible stress”的概念在各个工程学科的结构和组件设计与分析中是基础性的。通过理解和应用这一概念，工程师可以确保他们的设计是安全的、可靠的，并且能够承受施加于它们的要求。随着技术的进步和新材料的发展，“permissible stress”的确定和应用将继续发展，进一步增强工程实践的安全性和效率。