Study of fatigue failure mechanisms and establishment of fatigue reliability for extruded magnesium alloys to develop light weight mechanical components

研究挤压镁合金的疲劳失效机制并建立疲劳可靠性，以开发轻量化机械部件

• 批准号: 22560075
• 负责人: SHIOZAWA Kazuaki
• 金额: $ 2.83万
• 依托单位: Fukui University of Technology (2011-2012)University of Toyama (2010)
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2010
• 资助国家: 日本
• 起止时间: 2010 至 2012
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-22560075/
• 关键词: 高サイクル疲労; 低サイクル疲労; マグネシウム合金; 異方性; 集合組織; 応力比; ショットピーニング; 切欠き効果; 疲労; 展伸マグネシウム合金; 切欠き; 切欠き係数; 変形異方性; 双晶; 超高サイクル疲労

Low-cycle and high-cycle fatigue performance and fatigue failure mechanism have been discussed for extruded magnesium alloys which showed a strong mechanical anisotropy and texture with extruding. Due to the action of mechanical twinning in compressive phase, asymmetrical shape of hysteresis loop was observed in total strain-controlled and stress-controlled low-cycle fatigue process. An energy-based model taken into account of plastic and elastic energy density was proposed to predict the fatigue lives. From the very high cycle fatigue experiments, specimens showed a stepwise S-N curve on which two knees existed. This characteristic appearance was depended on applied stress ratio, that is mean stress effect, and loading mode, such as axial loading and rotating bending fatigue, and also induced by crack initiation mechanism changing from the twin deformation in high-stress amplitude level to slip deformation in low-stress amplitude level. In this study, effect of notch on fatigue strength and improvement of fatigue strength by fine particle shot peening treatment were discussed.

讨论了挤压镁合金的低周和高周疲劳性能以及疲劳失效机制，该合金在挤压过程中表现出很强的机械各向异性和织构。由于压缩阶段机械孪生的作用，在全应变控制和应力控制的低周疲劳过程中观察到了不对称的磁滞回线形状。提出了一种考虑塑性和弹性能量密度的基于能量的模型来预测疲劳寿命。从极高循环疲劳实验来看，样品呈现出阶梯式的 S-N 曲线，其中存在两个拐点。这种特征的出现取决于施加的应力比，即平均应力效应，以及轴向载荷和旋转弯曲疲劳等加载方式，并且还由裂纹萌生机制从高应力幅值的孪生变形到低应力幅值的滑移变形的转变引起。本研究讨论了缺口对疲劳强度的影响以及通过细颗粒喷丸处理提高疲劳强度。

项目成果

マグネシウム合金押出し材の応力及びひずみ制御低サイクル疲労変形挙動と疲労寿命評価

镁合金挤压件应力应变控制低周疲劳变形行为及疲劳寿命评价

• 发表时间: 2011
• 作者: K. Shiozawa;M. Kashiwagi;T. M;Kazuaki SHIOZAWA;塩澤和章,宮崎雅士;塩澤和章,宮崎雅士;塩澤和章 ,池田 惇,福森 毅;塩澤和章;塩澤和章
• 通讯作者: 塩澤和章

展伸マグネシウム合金の応力制御低サイクル疲労挙動に及ぼす変形異方性の影響

变形各向异性对膨胀镁合金应力控制低周疲劳行为的影响

• 发表时间: 2011
• 作者: 北島 純;塩澤和章,村井勉,高橋泰
• 通讯作者: 塩澤和章,村井勉,高橋泰

ショットピーニング処理を施したマグネシウム合金AZ80押出し材の超高サイクル疲労特性

喷丸镁合金AZ80挤压件的超高周疲劳性能

• 发表时间: 2010
• 作者: K. Shiozawa;J. Kitajima;T. Kaminashi;T. Myrai and T. Takahashi;塩澤和章 ,上梨智弘,北島 純,村井 勉,高橋 泰;塩澤和章;塩澤和章 ,北島純,上梨智弘,村井勉,高橋泰;塩澤和章;塩澤和章;塩澤和章 ,池田惇,村井勉,高橋泰;塩澤和章 ,宮崎雅士,村井勉,高橋泰;塩澤和章;塩澤和章
• 通讯作者: 塩澤和章

Fatigue behaviour and fractography of extruded AZ80 magnesium alloys in very high cycle regime 【 keynoto lecture 】

极高循环状态下挤压 AZ80 镁合金的疲劳行为和断口分析 [keynoto 讲座]

• 发表时间: 2010
• 作者: K. Shiozawa;M. Kashiwagi;T. Murai and T. Talahashi
• 通讯作者: T. Murai and T. Talahashi

展伸マグネシウム合金の疲労に関する最近の話題

膨胀镁合金疲劳的最新主题

• 发表时间: 2011
• 作者: K. Shiozawa;M. Kashiwagi;T. M;Kazuaki SHIOZAWA;塩澤和章,宮崎雅士;塩澤和章,宮崎雅士;塩澤和章 ,池田 惇,福森 毅;塩澤和章;塩澤和章;塩澤和章,北島純,上梨智弘,村井勉,高橋泰;塩澤和章
• 通讯作者: 塩澤和章