V2EX three-point bending

Three-Point Bending

Definition / 定义

三点弯曲(试验):一种常见的材料/结构弯曲测试方法,把试样(如梁或板)放在两个支点上,在中间施加一个集中载荷,从而测量其抗弯强度、挠度与弹性模量等。(也常写作 three-point bend(ing) test

Pronunciation / 发音

/θri pnt bnd/

Examples / 例句

The lab used three-point bending to compare the stiffness of different plastics.
实验室用三点弯曲来比较不同塑料的刚度。

In a three-point bending test, the maximum bending stress occurs at the specimen’s surface under the central load, so small cracks there can strongly affect the results.
在三点弯曲试验中,最大弯曲应力出现在试样表面且位于中央载荷下方,因此那里的微小裂纹会显著影响测试结果。

Etymology / 词源

Three-point bending 是由 three-point(三点:两处支撑点 + 一处加载点)和 bending(弯曲)组成的工程复合术语,直观描述了载荷与支撑的几何布置方式。该表达在材料力学与试验标准中广泛使用。

Related Words / 相关词

Literary Works / 文学作品

  • Mechanics of Materials(Gere & Timoshenko 等教材体系中常见弯曲试验与梁理论讨论,会涉及三点弯曲/弯曲试验)
  • Roark’s Formulas for Stress and Strain(工程经典工具书,涵盖梁受载与挠度计算,常用于解释三点弯曲相关量)
  • ASTM D790(Standard Test Methods for Flexural Properties of Unreinforced and Reinforced Plastics and Electrical Insulating Materials,塑料弯曲性能测试标准中常用三点弯曲布置)
  • ISO 178(Plastics Determination of flexural properties,塑料弯曲性能国际标准,常采用三点弯曲方法)
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