判断题
伸长率和弯曲试验都可以用来反映钢筋的塑性性能。
发布日期：2021-03-23
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试题解析
弯曲试验
弯曲试验测定材料承受弯曲载荷时的力学特性的试验，是材料机械性能试验的基本方法之一。弯曲试验时，试样一侧为单向拉伸，另一侧为单向压缩，最大正应力出现在试样表面，对表面缺陷敏感，因此，弯曲试验常用于检验材料表面缺陷如渗碳或表面淬火层质量等。另外，对于脆性材料，因对偏心敏感，利用拉伸试验不容易准确测定其力学性能指标，因此，常用弯曲试验测定其抗弯强度，并相对比较材料的变形能力。
- 中文名
- 弯曲试验
- 类别
- 材料机械性能试验
- 特点
- 弯曲试验试样样式简单
- 外文名
- bending test
- 用途
- 测定脆性和低塑性材料的抗弯强度
- 对比
- 拉伸试验
伸长率
伸长率是指试样在拉伸断裂后，原始标距的伸长与原始标距之比的百分率。伸长率是表示材料均匀变形或稳定变形的重要参数。
- 中文名
- 伸长率
- 定义
- 原始标距的伸长与原始标距之比
- 表征
- 材料均匀变形或稳定变形
- 外文名
- elongation
- 表达式
- △L/L
- 学科
- 材料力学
塑性
对物体施加外力，当外力较小时物体发生弹性形变，当外力超过某一数值，物体产生不可恢复的形变，这就叫塑性形变。塑性即物体变形的能力。与之相对的，对一物体施加外力，物体产生形变，移除外力，发现形变消失，物体恢复原样，这就是弹性，弹性越大的物体，能够承受越大的外力而不发生永久形变。而通常塑性越大的物体，能发生永久形变所需的最小力越小。
- 中文名
- 塑性
- 解释
- 外力
- 率相关性
- 大小可能是加载速度快慢的
- 外文名
- Plasticity. Ductility,Briquettability
- 评价标准
- 伸长率
- 钢筋塑性指标
- 冷弯性能
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