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引用次数: 0
摘要
晶格结构因其独特的轻质、高抗冲击性和理想的降噪效果而成为学者们研究的重点。选择性激光熔融已成为制备优质晶格结构的一种非常有效和便捷的方法。然而,必须承认的是,该方法固有的快速加热和冷却过程会在晶格结构中产生过大的残余应力,从而严重影响其机械性能。为解决这一问题,本研究采用实验技术和有限元分析相结合的方法,试图阐明简单立方晶格结构内残余应力和变形的分布模式和特征。这些简单立方晶格结构的制造是通过选择性激光熔化完成的。研究包括两种方法,一种是对结构上的离散点进行 X 射线测量,另一种是进行有限元模拟以描述整体应力分布。结果表明,残余应力和变形更有可能集中在待加工的初始表面上,而且基材上的残余应力要大于棒材上的残余应力。具体来说,最大的应力集中在 Z 形棒材上,高达 1393 兆帕。不过,从结构应力分布的整体状态来看,基体上的残余应力略高于晶格结构上的残余应力。
Study on the residual stress of simple cubic lattice structure produced by selective laser melting
Lattice structures become the focus for scholars to research due to its unique lightweight, high impact resistance and ideal noise reduction. Selective laser melting has become a very effective and convenient method for preparing lattice structures of excellent quality. However, it is imperative to acknowledge that rapid heating and cooling processes inherent to the method can generate excessive residual stresses within the lattice structures, thereby significantly compromising their mechanical properties. To address this issue, the present study seeks to elucidate the patterns and characteristics of distribution of residual stresses and deformations within simple cubic lattice structures, employing a combination of experimental techniques and finite element analysis. The fabrication of these simple cubic lattice structures is accomplished through selective laser melting. The investigation encompasses both two methods, involving X-ray measurements at discrete points on the structure, and finite element simulations to depict the overall stress distribution. The results show that the residual stress and deformation are more likely concentrated on the initial surface to be processed, and residual stress on the substrates is bigger than that on bars. Specifically, the biggest stress concentrates on the Z-bars, up to 1393 MPa. However, in terms of the overall state of stress distribution in the structure, the residual stress on the substrate is slightly higher than that on the lattice structure.
期刊介绍:
The Journal of Sandwich Structures and Materials is an international peer reviewed journal that provides a means of communication to fellow engineers and scientists by providing an archival record of developments in the science, technology, and professional practices of sandwich construction throughout the world. This journal is a member of the Committee on Publication Ethics (COPE).