دانلود رایگان مقاله لاتین فیوژن پودر لیزری از سایت الزویر
عنوان فارسی مقاله:
اعتبار تجربی مدل سازی اجزا محدود برای تغییر شکل فیوژن پودر لیزری تخت
عنوان انگلیسی مقاله:
Experimental validation of finite element modeling for laser powder bed fusion deformation
سال انتشار : 2016
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مقدمه انگلیسی مقاله:
1. Introduction
Recent developments in additive manufacturing (AM) allow for the rapid production of end-use parts without the need for signifi- cant post-build machining. In particular, the accuracy attainable by laser powder bed fusion (LPBF) AM allows for parts to be built with complex interior geometry previously unattainable by traditional manufacturing means. However, residual stresses caused by localized thermal gradients in the parts often result in build failures. Build failures include: delamination of layers, support structure fracture, part interference with the recoating mechanism, high levels ofpost-build distortion, voids insolidmaterial, and lack offusion of deposited material [1–3]. In order to mitigate the several types of failure associated with high levels of material deformation, an improved understanding of how deformation and residual stress accumulate in AM parts is needed. Much of the experimental research is focused on the microscale, single lines and individual layers. Pohl et al. [4] varied laser scan pattern and speed for a single layer and used post-process experimental deflection results to compare and identify the best build parameters. Work shown by Kempen et al. [5] utilizes a new technique for in situ melt pool characterization. By analyzing the melt pool in situ, ideal processing parameters are selected by performing several single track tests. While experiments like these are useful in the determination ofideal processing parameters required to achieve fully dense and fused material, they do not address geometry dependent structural stresses that build up in full-scale LPBF built components. While experiments may be informative to the LPBF build process, when extended to the larger scale this type of parametric analysis proves to be expensive. In these cases, simulation can be used to identify ideal parameters to be used in LPBF. Zhang et al.[6] performed an analysis on processing parameters for the LPBF build process. The study focused on a W–Ni–Fe powder bed build where a model was used to determine processing parameters required to reach a user specified melt pool depth. Another study performed by Dai et al.[7] used simulations to predict melt pool size based off of an input laser energy density. The work focused heavily on measuring the size of the melt pool and determined that the melt pool dimensions are on the order of hundreds of microns for LPBF. These studies provide examples of how modeling can be used in the setup stages of LPBF to identify processing parameters for a specific build process without the need for expensive experiments. Modeling of additive manufacturing has proven to be successful inimproving theunderstanding ofthe distortionaccumulationduring the AM process and guiding the design process to reduce build failures [5,8–21]. For example, Denlinger et al. [22] demonstrates the utility that FE modeling can have in the prevention part distortion. Similarmodels are scarce in the powder bedfield.Mostmodels that are available are limited to simulating small build volumes or single layers [16,17], melt pool dynamics [7] or have limited their analysis to the thermal side of the LPBF process [6,14,16]. While each of referenced experiments provide utility to the field of additive manufacturing, none has demonstrated capabilities for part-scale modeling.
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کلمات کلیدی:
Laser powder bed fusion additive manufacturing of metals; physics ... aip.scitation.org/doi/full/10.1063/1.4937809?track=tweet by WE King - 2015 - Cited by 38 - Related articles The powder bed fusion process is alternately known as selective laser ... to fail or result in surface deformations that can damage the coater or inhibit the coater's ... Technologies | Free Full-Text | Overhanging Features and the SLM ... www.mdpi.com/2227-7080/5/2/15/htm by AE Patterson - 2017 ... for SLM/DMLS, the process is a variation of the powder bed fusion process in ... example finite-element (FEA) model of the thermal deformations during laser ... [PDF]Experimental validation of finite element modeling for laser powder ... iranarze.ir/wp-content/uploads/2016/09/E26.pdf Aug 30, 2016 - experimental data for laser powder bed fusion made parts. Here ... tal measurements of post-build deformation, within a 12% percent error as ... Powder Bed Fusion | Additive Manufacturing Research Group ... www.lboro.ac.uk/research/amrg/about/.../powderbedfusion/ The Powder Bed Fusion process includes the following commonly used printing techniques: Direct metal laser sintering (DMLS), Electron beam melting (EBM), ... 6. Experimental validation of finite element modeling for laser powder ... en.ustc.findplus.cn/?h=articles&db=edselc&an=edselc.2...0... Translate this page Title: Experimental validation of finite element modeling for laser powder bed fusion deformation. Authors: Dunbar, A.J.1. Denlinger, E.R.2. Gouge, M.F.2 [PDF]Optical, Layerwise Monitoring of Powder Bed Fusion - (SFF) Symposium https://sffsymposium.engr.utexas.edu/sites/default/files/2015/2015-24-Foster.pdf by BK Foster - Cited by 9 - Related articles In powder bed fusion additive manufacturing, pre-placed layers of powder are successively fused to form ... surface finish, and thermal deformation. Here ... Searches related to powder bed fusion deformation metal additive manufacturing: a review of mechanical properties alsi10mg hot isostatic pressing
