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Combined experimental–numerical study on residual stresses induced by a single impact as elementary process of mechanical peening
Strain ( IF 2.1 ) Pub Date : 2020-05-13 , DOI: 10.1111/str.12338
Paul Sandmann 1 , Marc‐André Nielsen 2 , Sören Keller 2 , Emad Maawad 2 , Peter Staron 2 , Benjamin Klusemann 1, 2
Affiliation  

Peening processes can be used as a fatigue enhancement treatment for metallic structures by locally introducing compressive residual stresses. A combined experimental–numerical study on a single‐impact process with a drop tower on the aluminium alloy AA5754, representing the elementary process of mechanical peening, has been performed to investigate different impact parameters on the residual stress profile. Residual stresses have been measured using high‐energy X‐Ray diffraction. A three‐dimensional finite element model is used to predict the residual stresses numerically. The elastic strain components from the numerical results are used to calculate residual stresses by assuming either a plane stress or a plane strain state for different specimen thickness to assess the validity of respective assumption. The validity of the numerical simulation is evaluated based on comparisons of the elastic strain profiles and the percentage loss in kinetic energy of the steel ball due to the impact for four different energies, showing overall a good agreement in the experimental–numerical comparisons.

中文翻译:

机械冲击的基本过程-一次冲击引起的残余应力的组合实验-数值研究

通过局部引入压缩残余应力,喷丸处理可用作金属结构的疲劳增强处理。对铝合金AA5754上带有落塔的单次冲击过程进行了实验和数值研究的组合,该实验代表了机械喷丸的基本过程,以研究对残余应力曲线的不同影响参数。残余应力已使用高能X射线衍射测量。三维有限元模型用于数字预测残余应力。数值结果中的弹性应变分量用于计算残余应力,方法是针对不同的样本厚度通过假设为平面应力或平面应变状态来评估各个假设的有效性。
更新日期:2020-05-13
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