crackback

crackback的音标为[ˈkrækˌbæk]：

基本翻译：回击，反击。

速记技巧：crack（击打）+back（向后）=回击。

Crackback这个词的词源可以追溯到古英语，它由两部分组成：“crack”和“back”。Crack这个词表示裂缝或破裂，back则表示方向或后面。因此，Crackback这个词的含义是“回弹”、“反弹”。

变化形式：在词形上，Crackback没有明显的变化形式。

相关单词：

1. crack（破裂）：这个词和Crackback有着相似的含义，表示物体破裂或断裂。

2. bounce（反弹）：这个词和Crackback一样，表示物体在受到冲击后返回原位。

3. rebound（回弹）：这个词和Crackback非常相似，都表示物体在受到外力作用后返回原位。

4. recoil（后座）：这个词表示武器在发射后向后移动。

5. recoilage（后座补偿）：这个词表示为了减少武器的后座而对武器进行的调整。

6. backlash（回转）：这个词表示齿轮或其他机械装置在转动时产生的反向运动。

7. backward（向后的）：这个词表示方向或位置在后方或相反方向。

8. recoilless（无后座的）：这个词表示一种能够减少武器后座的特殊设计。

9. recoilless rifle（无后座步枪）：这个词表示一种使用特殊设计的步枪，能够减少后座力对人造成的伤害。

10. recoilless gun（无后座炮）：这个词表示一种使用特殊设计的火炮，能够减少后座力对炮架和炮弹的影响。

常用短语：

1. crackback test

2. crackback phenomenon

3. crackback resistance

4. crackback strength

5. crackback stress

6. crackback testing

7. crackback analysis

例句：

1. The crackback phenomenon was observed during the experiment, which indicated that the material had poor ductility.

2. The crackback resistance of the material was tested and found to be satisfactory.

3. The crackback strength of the steel was measured and found to be high.

4. The crackback stress of the material was determined and used to calculate its safety factor.

5. The crackback testing of the component was conducted to ensure its quality and compliance with specifications.

6. The crackback analysis of the structure revealed potential issues that needed to be addressed.

7. The crackback test is a crucial method for assessing the integrity and safety of materials and components.

英文小作文：

Crackback is a phenomenon that occurs during the testing of materials and components, particularly when they are subjected to certain types of stress or strain. It is a critical aspect of ensuring the quality and safety of materials and components, as it provides information about their strength, ductility, and other mechanical properties.

During crackback testing, a material or component is subjected to a certain type of stress or strain, and then the stress or strain is removed. If there is any remaining stress or strain in the material or component, it will cause it to deform in a particular way, resulting in a crack or fracture in a certain location. This crack or fracture is called a crackback, and it provides information about the mechanical properties of the material or component.

Crackbacks can occur in different types of materials and components, including metals, polymers, composites, and other materials. They are commonly used in the manufacturing process to ensure that materials and components meet their specifications and have the desired mechanical properties. Crackbacks can also be used to identify potential issues with materials or components that may not be apparent during other testing methods, such as tensile testing or compression testing.

In conclusion, crackback testing is an essential method for ensuring the quality and safety of materials and components, as it provides information about their mechanical properties and potential issues that may exist within them. It is crucial for ensuring that materials and components meet their specifications and have the desired mechanical properties for their intended use.