Fatigue behaviour and residual stresses of thin laser-beam-welded magnesium-alloys under multiaxial loading
多轴载荷下激光束焊接薄镁合金的疲劳行为和残余应力
基本信息
- 批准号:191076967
- 负责人:
- 金额:--
- 依托单位:
- 依托单位国家:德国
- 项目类别:Research Grants
- 财政年份:2010
- 资助国家:德国
- 起止时间:2009-12-31 至 2017-12-31
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
The aim of the research project is to develop fatigue strength hypothesis appropriate for thin walled laser-beam magnesium welds subjected to multiaxial loading with constant and variable amplitudes and constant and varying principal stress directions. In the first project phase fatigue strength hypothesis for constant amplitudes were identified successfully. In the second phase suitable hypothesis for variable amplitude loading should be provided. As there is no knowledge about the fatigue behavior of magnesium welds under multiaxial and variable loading, besides analytic work on fatigue strength hypothesis, experimental work has also to be done.The determination of the entire residual stress condition is a fundamental part of the project. With experimental methods the residual stresses of the tubular specimens can only be determined up to a limited depth which is insufficient with regard to the detected crack initiation sites. Nev-ertheless the experiments are required to assess the accuracy of the calculated residual stresses. The FE-calculations have shown that the residual stress condition cannot be described easily with the existing evaluation models. The target of the upcoming work period is the investigation of the influence of the anisotropy of the magnesium on the residual stress generation and their stability. Furthermore investigations of the relaxation behaviour of the residual stress under different loads shall be carried.The results of the project close a gap of knowledge concerning magnesium welds and therefore reduce the relative deficit of magnesium compared to aluminum and steel. Hence, this could be the basis for better exploiting the lightweight potential of magnesium in the future and conserving energy and resources.
该研究项目的目的是建立适用于承受恒定和可变幅值、恒定和变化主应力方向的多轴载荷的薄壁激光镁焊接接头的疲劳强度假设。在第一个项目阶段,成功地确定了恒幅疲劳强度假设。在第二阶段,应为变幅加载提供合适的假设。由于对镁合金焊接接头在多轴、变载荷作用下的疲劳行为缺乏了解,除了疲劳强度假设的分析工作外,还需要进行实验工作。确定整个残余应力状态是项目的基础。用实验方法可以确定管状试件的残余应力只有一个有限的深度,这对于检测到的裂纹萌生位置是不够的。然而,需要通过实验来评估计算的残余应力的准确性。有限元计算表明,现有的评定模型不能很好地描述残余应力状态。未来工作阶段的目标是研究镁的各向异性对残余应力产生及其稳定性的影响。此外,还将对不同载荷下残余应力的松弛行为进行研究。该项目的结果填补了关于镁焊接的知识空白,从而减少了镁与铝和钢相比的相对赤字。因此,这可能是未来更好地挖掘镁的轻质潜力,节约能源和资源的基础。
项目成果
期刊论文数量(5)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
Numerical measures of the degree of non-proportionality of multiaxial fatigue loadings
多轴疲劳载荷非比例程度的数值测量
- DOI:10.3221/igf-esis.33.30
- 发表时间:2015
- 期刊:
- 影响因子:0
- 作者:Bolchoun;Sonsino;Kaufmann
- 通讯作者:Kaufmann
A new method for fatigue life evaluation under out-of-phase variable amplitude loadings and its application to thin-walled magnesium welds
- DOI:10.1016/j.ijfatigue.2017.01.012
- 发表时间:2017-08
- 期刊:
- 影响因子:6
- 作者:A. Bolchoun;J. Baumgartner;H. Kaufmann
- 通讯作者:A. Bolchoun;J. Baumgartner;H. Kaufmann
Fatigue life assessment of thin-walled welded joints under non-proportional load-time histories by the shear stress rate integral approach
采用剪应力率积分法评估非比例载荷-时间历史下薄壁焊接接头的疲劳寿命
- DOI:10.3221/igf-esis.38.22
- 发表时间:2016
- 期刊:
- 影响因子:0
- 作者:Bolchoun;Sonsino;Kaufmann
- 通讯作者:Kaufmann
Multiaxial Random Fatigue of Magnesium Laserbeam-welded Joints – Experimental Results and Numerical Fatigue Life Evaluation☆
镁激光束焊接接头的多轴随机疲劳 实验结果和数值疲劳寿命评估
- DOI:10.1016/j.proeng.2015.02.009
- 发表时间:2015
- 期刊:
- 影响因子:0
- 作者:Bolchoun;Sonsino;Kaufmann
- 通讯作者:Kaufmann
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Dr.-Ing. Thomas Nitschke-Pagel其他文献
Dr.-Ing. Thomas Nitschke-Pagel的其他文献
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{{ truncateString('Dr.-Ing. Thomas Nitschke-Pagel', 18)}}的其他基金
Influence of mechanically induced hardening on the generation of welding residual stresses
机械诱导硬化对焊接残余应力产生的影响
- 批准号:
273371116 - 财政年份:2015
- 资助金额:
-- - 项目类别:
Research Grants
Integrale Bestimmung des Eigenspannungsfeldes in Mehrlagenschweißverbindungen
多层焊接接头残余应力场的整体测定
- 批准号:
213110645 - 财政年份:2012
- 资助金额:
-- - 项目类别:
Research Grants
Inhomogenes Verformungsverhalten in Entfestigungszonen geschweißter hochfester Aluminiumlegierungen
高强度铝合金焊接软化区的不均匀变形行为
- 批准号:
126176267 - 财政年份:2009
- 资助金额:
-- - 项目类别:
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Eigenspannungsabbau bei schwingbeanspruchten Schweißverbindungen aus hochfesten Stählen
减少高强度钢制成的振动应力焊接连接的内应力
- 批准号:
27808113 - 财政年份:2006
- 资助金额:
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