| 低幅载荷强化和损伤两重性试验研究 |
| |
| 引用本文： | 郑松林,袁锋,冯金芝,李丽,王寅毅.低幅载荷强化和损伤两重性试验研究[J].机械强度,2009,31(6). |
| |
| 作者姓名： | 郑松林 袁锋 冯金芝 李丽 王寅毅 |
| |
| 作者单位： | 1. 上海理工大学,机械工程学院,汽车研究所,上海,200093;同济大学,汽车学院,上海,201804
2. 上海理工大学,机械工程学院,汽车研究所,上海,200093 |
| |
| 基金项目： | 国家自然科学基金，上海市教委重点创新基金项目，上海市科委重点攻关项目 |
| |
| 摘 要： | 以40Cr试样的两级疲劳试验为基础,系统分析低幅载荷作用后试样疲劳强度变化规律,发现存在一个载荷最佳锻炼次数,低幅载荷的强化和损伤作用以这个最佳锻炼次数为分界点.在分界点之前,低幅载荷作用后试样疲劳强度逐级提高,低幅载荷表现为强化作用;在分界点之后,低幅载荷作用后虽然试样疲劳强度仍然得到强化和提高,但疲劳强度提高的程度逐级降低,即低幅载荷的强化作用逐级减弱,表明损伤的逐级增加.这种特性为产品轻量化设计时合理确定载荷谱中低幅载荷的等级及其作用次数提供重要参考.
|
| 关 键 词： | 疲劳强度 低幅载荷 强化 损伤 |
DUAL-EFFECT EXPERIMENT STUDY ON STRENGTHENING AND DAMAGING UNDER LOW AMPLITUDE LOAD |
| |
| ZHENG SongLin,YUAN Feng,FENG JinZhi,LI Li,WANG YinYi.DUAL-EFFECT EXPERIMENT STUDY ON STRENGTHENING AND DAMAGING UNDER LOW AMPLITUDE LOAD[J].Journal of Mechanical Strength,2009,31(6). |
| |
| Authors: | ZHENG SongLin YUAN Feng FENG JinZhi LI Li WANG YinYi |
| |
| Abstract: | Based on fatigue tests of 40Cr specimen, analysis of the fatigue strength change law under low amplitude load, it was founded that a best training time exist, the training time is the demarcation point of strengthening and damaging under low amplitude load. Before the demarcation point,the specimen's fatigue strength gradually increase under low amplitude load, low amplitude load show strengthening-effect; after the demarcation point, the specimen's fatigue strength still improve, but gradually reduce under low amplitude load, low amplitude load's strengthening-effect gradually weakened, damaging-effect gradually increased. This feature can provide an important reference to determine a reasonable low amplitude load level and its training time in the load spectrum for lightweight product designing. |
| |
| Keywords: | Fatigue strength Low amplitude load Strengthening Damaging |
| 本文献已被 万方数据 等数据库收录！ |
|
