Numerical Investigation of the Effect of Rolling on the Localized Stress and Strain Induction for Wire + Arc Additive Manufactured Structures
Numerical Investigation of the Effect of Rolling on the Localized Stress and Strain Induction for Wire + Arc Additive Manufactured Structures
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DOI：
10.1007/s11665-019-04249-y
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发表时间：
2019-08
影响因子：
2.3
通讯作者：
Masoud Abbaszadeh;J. Hönnige;F. Martina;L. Neto;N. Kashaev;P. Colegrove;Stewart W. Williams;B. Klusemann
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文献类型：
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作者：
Masoud Abbaszadeh;J. Hönnige;F. Martina;L. Neto;N. Kashaev;P. Colegrove;Stewart W. Williams;B. Klusemann
在定向能沉积技术中，如高沉积速率线材+电弧增材制造（WAAM）工艺中，冷轧可以在工艺中或工艺后用于改善组织、力学性能和残余应力。采用有限元模拟方法研究了轧制参数，特别是轧制载荷和辊型半径对异型辊残余应力场和塑性应变分布的影响。结果表明，在考虑残余应力存在的情况下，WAAM中常用结构金属AA2319、S335JR钢和Ti-6Al-4V对轧制的响应。滚动载荷导致压残余应力的位置和最大值以及压残余应力的深度发生变化。然而，辊型半径只改变这些压残余应力的最大值。改变滚动载荷会影响墙体近顶面及更深区域的等效塑性应变，而辊型半径对等效塑性应变的影响可以忽略不计。塑性应变分布几乎不受轧制前初始残余应力的影响。最后，通过模拟生成不同材料的设计曲线，提出了在增材结构特定深度需要一定塑性应变的理想轧制载荷和辊型组合，以改善微观组织。
Cold rolling can be used in-process or post-process to improve microstructure, mechanical properties and residual stress in directed-energy-deposition techniques, such as the high deposition rate wire + arc additive manufacturing (WAAM) process. Finite element simulations of the rolling process are employed to investigate the effect of rolling parameters, in particular rolling load and roller profile radius on the residual stress field as well as plastic strain distribution for the profiled roller. The results show the response to rolling of commonly used structural metals in WAAM, i.e., AA2319, S335JR steel and Ti-6Al-4V, taking into account the presence of residual stresses. The rolling load leads to changes in the location and the maximum value of the compressive residual stresses, as well as the depth of the compressive residual stresses. However, the roller profile radius only changes the maximum value of these compressive residual stresses. Changing the rolling load influences the equivalent plastic strain close to the top surface of the wall as well as in deeper areas, whereas the influence of the roller profile radius is negligible. The plastic strain distribution is virtually unaffected by the initial residual stresses prior to rolling. Finally, design curves were generated from the simulations for different materials, suggesting ideal rolling load and roller profile combinations for microstructural improvement requiring certain plastic strains at a specific depth of the additive structure.