一种激光粉末床熔融过程中路径级残余应力的模拟框架
A Framework for Simulating the Path-level Residual Stress in the Laser Powder Bed Fusion Process
AI总结：
针对激光粉末床熔融（LPBF）路径级残余应力模拟计算成本高的难题，提出基于路径级热历史、引入有效热应变概念的高效模拟框架，经高保真结果验证后，探究了热历史与层形状对残余应力的影响。
摘要：
激光粉末床熔融（Laser Powder Bed Fusion, LPBF）增材制造技术凭借其制造复杂定制化构件的能力，已为诸多行业带来变革。LPBF工艺利用移动热源使金属粉末熔化并凝固，快速的熔化与冷却过程会产生残余应力，这对零件质量有着至关重要的影响。目前，在路径尺度上精确模拟残余应力的计算强度仍是一项重大挑战，限制了我们对LPBF工艺的理解。本文提出了一种基于路径级热历史的LPBF工艺残余应力模拟框架。与现有方法相比，路径级模拟仅需通过离散化来捕捉扫描路径，而非熔池的细节，因此所需网格密度更低，计算效率更高。我们通过引入一个名为有效热应变的新概念来构建该框架，以捕捉熔池内部及周边的各向异性热应变。我们利用文献中的高保真结果验证了所提方法的有效性。我们采用该方法模拟了多种单岛扫描图案，以及包含多个完整岛和修剪岛的层结构。通过分析模拟结果，我们进一步探究了路径级热历史和层形状对残余应力的影响。
英文摘要：
Laser Powder Bed Fusion (LPBF) additive manufacturing has revolutionized industries with its capability to create intricate and customized components. The LPBF process uses moving heat sources to melt and solidify metal powders. The fast melting and cooling leads to residual stress, which critically affects the part quality. Currently, the computational intensity of accurately simulating the residual stress on the path scale remains a significant challenge, limiting our understanding of the LPBF processes. This paper presents a framework for simulating the LPBF process residual stress based on the path-level thermal history. Compared with the existing approaches, the path-level simulation requires discretization only to capture the scanning path rather than the details of the melt pools, thus requiring less dense mesh and is more computationally efficient. We develop this framework by introducing a new concept termed effective thermal strain to capture the anisotropic thermal strain near and around the melt pool. We validate our approach with the high-fidelity results from the literature. We use the proposed approach to simulate various single-island scanning patterns and layers with multiple full and trimmed islands. We further investigate the influence of the path-level thermal history and the layer shape on the residual stress by analyzing their simulation results.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
