Research on clarication of fatigue mechanism in metal matrix composites and evaluation method for its mechanical characteristics

金属基复合材料疲劳机理的阐明及其力学性能评价方法研究

• 批准号: 05650084
• 负责人: NOGUCHI Hiroshi
• 金额: $ 1.22万
• 依托单位: KYUSHU UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1993
• 资助国家: 日本
• 起止时间: 1993 至 1994
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-05650084/
• 关键词: Metal Matrix Composites; SiC Whisker; Aluminum Alloy; Fatigue Strength; Fatigue Crack Initiation; Fatigue Crack Propagation; アルミニウ合金; 金属基複合材料; ウィスカ; 金属疲労; 複合材料; 切欠き

In this research, rotating-bending and push-pull fatigue tests of the SiC whisker reinforced 6061-T6,2024-T4 and 7057-6T aluminum alloy made by powder metallurgy were carried out to investigate the fatigue mechanism of plain and notched specimens at room temperature. The fatigue mechanisms in three materials were clarified through successive surface observations using the plastic replica method. Obtained results are as follows.(1) Fatigue strength of all MMC increase and are about as high as the steel.(2) The fatigue life is consumed in the fatigue propagation life of small crack by 100mum.(3) All MMC has a notch sensitivity, and the fatigue limit with a blunt notch has a large statistical factor.(4) It is indicated from (3) andf (4) that the fatigue life of all MMC has a large scatter.(5) A simple method for predictiction of statistical fatigue life is important.(6) There is an optimum volume fraction of SiC whisker for each mechanical property, and it is dependent on the characteristics of matrix.

本研究对粉末冶金SiC晶须强化6061-T6、2024-T4和7057-6T铝合金进行旋转弯曲和推拉疲劳试验，研究普通和缺口试件的室温疲劳机理。通过使用塑料复制品方法进行连续的表面观察，阐明了三种材料的疲劳机制。得到的结果如下：（1）所有MMC的疲劳强度均有所提高，与钢差不多高。（2）疲劳寿命消耗在小裂纹的疲劳扩展寿命中100μm。（3）所有MMC均具有缺口敏感性，钝缺口疲劳极限统计系数较大。（4）由（3）和f（4）可知，所有MMC的疲劳寿命 MMC具有较大的分散性。(5)一种简单的方法来预测统计疲劳寿命很重要。(6)每种机械性能都存在一个最佳的SiC晶须体积分数，并且它取决于基体的特性。

项目成果

野口,尾田: "SiCウィスカ強化アルミニウム合金の疲労強度について" 平成7年度日本機械学会材料力学講演会予定.

Noguchi、Oda：“论SiC晶须强化铝合金的疲劳强度”1995年日本机械工程学会材料力学讲座日程。

野口・尾田: "SiCウィスカ強化アルミニウム合金の疲労強度について" 平成7年度日本機械学会材料力学講演会にて講演予定.

野口和小田：“关于SiC晶须强化铝合金的疲劳强度” 预定在1995年日本机械工程学会材料力学会议上发表演讲。

野口・西谷・尾田: "金属基複合材料の疲労劣化の機構" 日本材料学会平成6年度総会講演会. 講演予定.

Noguchi、Nishitani 和 Oda：“金属基复合材料的疲劳恶化机制”1994 年材料科学学会大会演讲日程。

Hiroshi NOGUCHI and Yasuji ODA: "Fatigue strength of SiC whisker reinforced aluminum alloy." Preprint of the Japanese Society of Mechanical Engineers Meeting in Morioka. (1995)

Hiroshi NOGUCHI 和 Yasuji ODA：“SiC 晶须增强铝合金的疲劳强度。”