permissible stress

简明释义

容许应力

英英释义

例句

1.Engineers must calculate the permissible stress (允许应力) in materials to prevent structural failures.

工程师必须计算材料中的permissible stress（允许应力），以防止结构失效。

2.During the inspection, it was confirmed that the beams were within the permissible stress (允许应力) limits.

在检查过程中，确认梁的应力在permissible stress（允许应力）限度内。

3.The permissible stress (允许应力) for this type of concrete is significantly higher than for regular concrete.

这种混凝土的permissible stress（允许应力）显著高于普通混凝土。

4.The bridge was designed to withstand a maximum of 1000 psi of permissible stress (允许应力) to ensure safety.

这座桥的设计能够承受最高1000 psi的permissible stress（允许应力），以确保安全。

5.It’s essential to adhere to the permissible stress (允许应力) values specified in the design codes.

遵循设计规范中规定的permissible stress（允许应力）值是至关重要的。

作文

Understanding the concept of permissible stress is crucial in various fields, particularly in engineering and materials science. Permissible stress refers to the maximum stress that a material can withstand without experiencing failure or permanent deformation. This concept is fundamental in designing structures and components that are safe and reliable. Engineers often use permissible stress values to ensure that the materials they choose for construction can handle the loads they will encounter during their service life.When designing a bridge, for example, engineers must consider the weight of vehicles, environmental factors like wind and earthquakes, and the material properties of the bridge itself. They calculate the loads that the structure will experience and compare these with the permissible stress of the materials used. If the applied stress exceeds the permissible stress, it could lead to catastrophic failure, which is why this calculation is so vital.The determination of permissible stress often involves safety factors. A safety factor is a multiplier applied to the expected loads to ensure that the material will not reach its limit under normal operating conditions. For instance, if a material has a yield strength of 300 MPa (megapascals), an engineer might apply a safety factor of 2, resulting in a permissible stress of 150 MPa for design purposes. This approach provides a buffer against unexpected overloads or material defects.In addition to structural applications, permissible stress is also important in mechanical engineering. For example, when designing shafts or beams that will rotate or bear loads, engineers must ensure that the applied forces do not exceed the permissible stress. If a shaft experiences stress beyond its permissible stress, it may fail due to fatigue or fracture, leading to costly repairs and potential hazards.Moreover, the concept of permissible stress extends beyond just static loads. In dynamic situations, such as machinery or vehicles in motion, the stresses can vary significantly. Engineers must account for these variations and ensure that the materials used can withstand the highest expected stresses without exceeding the permissible stress. This is particularly relevant in aerospace and automotive industries, where safety is paramount.In conclusion, permissible stress is a vital aspect of engineering that ensures materials and structures can safely support loads without failure. By understanding and applying the principles of permissible stress, engineers can design safer, more efficient systems that meet the demands of modern society. It is a concept that not only protects lives but also enhances the longevity and reliability of structures and machines we depend on every day.

理解可允许应力的概念在多个领域中至关重要，尤其是在工程和材料科学中。可允许应力是指材料在不发生失效或永久变形的情况下所能承受的最大应力。这个概念在设计安全可靠的结构和组件时是基本的。工程师通常使用可允许应力值来确保他们选择的建筑材料能够承受在其使用寿命期间所遇到的荷载。例如，在设计桥梁时，工程师必须考虑车辆的重量、风和地震等环境因素，以及桥梁本身的材料特性。他们计算结构将经历的荷载，并将这些荷载与所用材料的可允许应力进行比较。如果施加的应力超过了可允许应力，则可能导致灾难性的失败，这就是为什么这种计算如此重要。可允许应力的确定通常涉及安全系数。安全系数是施加在预期荷载上的一个乘数，以确保材料在正常操作条件下不会达到其极限。例如，如果一种材料的屈服强度为300 MPa（兆帕），工程师可能会应用一个安全系数为2，从而使设计目的下的可允许应力为150 MPa。这种方法提供了对意外超载或材料缺陷的缓冲。除了结构应用外，可允许应力在机械工程中也很重要。例如，在设计旋转或承载荷载的轴或梁时，工程师必须确保施加的力不会超过可允许应力。如果轴的应力超过其可允许应力，可能会由于疲劳或断裂而失效，导致昂贵的维修和潜在的危险。此外，可允许应力的概念不仅限于静态荷载。在动态情况下，例如运动中的机械或车辆，应力可能会显著变化。工程师必须考虑这些变化，并确保所用材料能够承受最高预期应力，而不会超过可允许应力。这在航空航天和汽车工业中尤为相关，因为安全至关重要。总之，可允许应力是工程学的一个重要方面，它确保材料和结构能够安全地支撑荷载而不会失效。通过理解和应用可允许应力的原则，工程师可以设计出更安全、更高效的系统，以满足现代社会的需求。这是一个不仅保护生命，而且增强我们每天依赖的结构和机器的耐久性和可靠性的概念。