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Numerical and experimental study of the consolidation of continuous carbon fiber thermoplastics made by robotic 3D printing 机器人三维打印技术制造的连续碳纤维热塑性塑料固结的数值和实验研究
IF 2.6 3区 材料科学 Q2 ENGINEERING, MANUFACTURING Pub Date : 2024-11-25 DOI: 10.1007/s12289-024-01865-5
Seyed Miri, Jash Rana, Kazem Fayazbakhsh, Chady Ghnatios

The 3D printing of continuous carbon fiber reinforced thermoplastics can widen their applications and allow the construction, on the fly, of complex composite parts. In this work, we model the consolidation of tapes through deformation and resin flow during robotic 3D printing of continuous carbon fiber low-melt poly aryl ether ketone (CF-LM PAEK) thermoplastics. Unidirectional tensile specimens per ASTM D3039-17 with a modified thickness (three tapes and two layers) are fabricated. The modeling effort of the squeeze flow involved in the process uses the anisotropic fluid model known as the Ericksen flow model. The proper generalized decomposition is used to simulate the tows deformation and the fluid flow while using an in-plane-out-of-plane decomposition. The modeling is validated with cross-section microscopy of the 3D printed specimen. Cross-ply and staggered tape deposition are explored as well.

连续碳纤维增强热塑性塑料的三维打印技术可拓宽其应用领域,并可快速制造复杂的复合材料部件。在这项工作中,我们模拟了在机器人三维打印连续碳纤维低熔聚芳基醚酮(CF-LM PAEK)热塑性塑料的过程中,通过变形和树脂流动对带子进行固结的情况。根据 ASTM D3039-17,制作了具有改良厚度(三带两层)的单向拉伸试样。工艺中涉及的挤压流建模工作使用了各向异性流体模型,即埃里克森流动模型。使用适当的广义分解来模拟丝束变形和流体流动,同时使用平面内-平面外分解。该模型通过 3D 打印试样的横截面显微镜进行了验证。此外,还对交叉层和交错带沉积进行了探讨。
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引用次数: 0
The evolution of thermal cycle, microstructures and mechanical properties of 6061 – T6 aluminum alloy thick plate Bobbin tool friction stir welded 6061 - T6 铝合金厚板波形工具搅拌摩擦焊的热循环、微观结构和机械性能的演变
IF 2.6 3区 材料科学 Q2 ENGINEERING, MANUFACTURING Pub Date : 2024-11-07 DOI: 10.1007/s12289-024-01863-7
Jiacheng Feng, Wenbiao Gong, Wei Liu, Yupeng Li, Rui Zhu

The relationship between thermal cycle, microstructures and properties of the joint in bobbin tool friction stir welding (BT-FSW) of aluminum alloys thick plates has not been reported in the literature, and the variations of microstructures and properties along the thickness direction needs to be explored. The objective of this paper is to interpret the evolution of thermal cycle, microstructures and mechanical properties of 16 mm thick 6061-T6 aluminum alloy BT-FSW joint in the thickness direction. With a traverse speed of 200 mm/min and 300 r/min of rotation speed, the thermal cycle temperature of the joint central layer is about 6 ℃ lower than that of the Shoulder Affected Zone (SAZ), and the Retreating Side (RS) are about 20 ℃ higher than the Advancing Side (AS). In order to illustrate the differences in the thickness direction of the joint, the joint was divided equally into three slices along the thickness direction. It is found that the equiaxed grains sizes of the Stir Zone (SZ) are 19.6 µm, 15.2 µm and 21.3 µm respectively in each region of the SZ1, SZ2 and SZ3 in the thickness direction, and the recrystallization extent of the SZ1 and SZ3 is higher than that of the SZ2. Transition from the SZ to the Heat-Affected Zone (HAZ), where the precipitates changes from the cluster-GP zone and β phase to the β” and β’ phases. The Vickers hardness curves for the cross-section of the joint are W-shaped, and the minimum Vickers hardness is found in the transition zone of the Thermal-Mechanically Affected Zone (TMAZ) and HAZ, which is 60 HV, and the SAZ has roughly 10 HV greater hardness than that of the central layer of the SZ. Along the thickness direction, the average tensile strength of the slices #1, #2 and #3 of the joints are 188 MPa, and 160 MPa, and 180 MPa respectively. The fracture of the three slices is ductile fractures.

铝合金厚板滚刀搅拌摩擦焊(BT-FSW)中接头的热循环、微观结构和性能之间的关系尚未见文献报道,微观结构和性能沿厚度方向的变化也有待探索。本文旨在解释厚度为 16 mm 的 6061-T6 铝合金 BT-FSW 接头在厚度方向上的热循环、微观结构和机械性能的演变。在横移速度为 200 mm/min、旋转速度为 300 r/min 的条件下,接头中心层的热循环温度比肩部影响区(SAZ)低约 6 ℃,后退侧(RS)比前进侧(AS)高约 20 ℃。为了说明关节厚度方向上的差异,将关节沿厚度方向平均分成三片。结果发现,在厚度方向上,SZ1、SZ2 和 SZ3 每个区域的搅拌区(SZ)等轴晶粒大小分别为 19.6 微米、15.2 微米和 21.3 微米,且 SZ1 和 SZ3 的再结晶程度高于 SZ2。从 SZ 过渡到热影响区 (HAZ),析出物从团簇-GP 区和β相转变为β "和β'相。接头横截面的维氏硬度曲线呈 "W "形,最低维氏硬度出现在热机械影响区(TMAZ)和 HAZ 的过渡区,为 60 HV,SAZ 的硬度比 SZ 中心层的硬度高出约 10 HV。沿厚度方向,接头 1 号、2 号和 3 号切片的平均抗拉强度分别为 188 兆帕、160 兆帕和 180 兆帕。这三个切片的断裂均为韧性断裂。
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引用次数: 0
Generalisation of the hydrodynamics model method for hot and cold strip rolling application 流体力学模型法在冷热轧板带轧制中的推广应用
IF 2.6 3区 材料科学 Q2 ENGINEERING, MANUFACTURING Pub Date : 2024-10-21 DOI: 10.1007/s12289-024-01860-w
Derrez Mimoune, Mohamed Zaaf, Tudor Balan, Abdennacer Lemmoui

The present work constitutes a generalization of the hydrodynamic model used to predict the pressures and the rolling speeds during the hot rolling of aluminum and copper strips. The hydrodynamic model with a linear behavior (Newton viscous) of the materials shows good predictions in the literature but its applicability is questionable in non-linear cases, when the materials exhibit viscoplastic or plastic behavior. This work extends the model to accommodate non-linear cases commonly encountered in rolling models (viscoplastic and plastic behaviors). The obtained results are in good agreement with experimental data from the literature. The validated model can, therefore, be considered an enhanced hydrodynamic model for predicting pressures and velocities during both hot and cold rolling of thin strips.

本研究对用于预测铝带和铜带热轧过程中的压力和轧制速度的流体力学模型进行了概括。在文献中,材料线性行为(牛顿粘性)的流体力学模型显示出良好的预测效果,但在材料表现出粘塑性或塑性行为的非线性情况下,该模型的适用性就值得怀疑了。本研究对模型进行了扩展,以适应轧制模型中常见的非线性情况(粘塑和塑性行为)。获得的结果与文献中的实验数据十分吻合。因此,经过验证的模型可被视为一种增强的流体力学模型,用于预测薄带材热轧和冷轧过程中的压力和速度。
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引用次数: 0
Optimisation of interlayer temperature in wire-arc additive manufacturing process using NURBS-based metamodel 使用基于 NURBS 的元模型优化线弧增材制造工艺中的层间温度
IF 2.6 3区 材料科学 Q2 ENGINEERING, MANUFACTURING Pub Date : 2024-10-16 DOI: 10.1007/s12289-024-01857-5
Mathilde Zani, Enrico Panettieri, Marco Montemurro

For wire arc additive manufacturing (WAAM) process the interlayer temperature highly influences the quality of manufactured parts. This paper proposes an optimisation of deposition parameters for a better control of interlayer temperature while reducing the printing time employing a Finite Element (FE) model and a metamodel based on Non Uniform Rational Basis Splines (NURBS) entities for a thin-walled part in aluminium alloy. Firstly, the thermal FE model is created to extract the interlayer temperature as a function of different deposition parameters that will be optimised. These parameters are the wire feed speed and the cooling time between deposition of two consecutive layers. Then, a NURBS-based metamodel is generated to approximate the (unknown) transfer function between input variables and output responses of the problem at hand. One of the advantages of this metamodeling strategy is the possibility of obtaining the gradient of the output responses without the requirement of further computational resources, as the resulting metamodel is available in analytical form with the requisite continuity and differentiability. The NURBS-based metamodel is generated as a solution of a three-step optimisation strategy aiming at determining all the parameters defining the shape of the NURBS entity. Finally, the NURBS-based metamodel is included in the optimisation process related to the considered application. The optimisation problem is defined as a weighted sum of different criteria, i.e., total printing time and the average interlayer temperature difference for each layer. The solution obtained is subsequently validated a posteriori using the high-fidelity FE model, demonstrating an excellent agreement between the prediction of the NURBS-based metamodel and those of the FE model.

对于线弧增材制造(WAAM)工艺,层间温度对制造零件的质量影响很大。本文针对铝合金薄壁零件,采用有限元(FE)模型和基于非均匀有理基样条(NURBS)实体的元模型,提出了优化沉积参数的方法,以更好地控制层间温度,同时缩短打印时间。首先,创建热 FE 模型,以提取层间温度,作为不同沉积参数的函数,并进行优化。这些参数包括送丝速度和连续两层沉积之间的冷却时间。然后,生成一个基于 NURBS 的元模型,以近似处理问题的输入变量和输出响应之间的(未知)传递函数。这种元模型策略的优点之一是可以获得输出响应的梯度,而不需要更多的计算资源,因为生成的元模型是分析形式的,具有必要的连续性和可微分性。基于 NURBS 的元模型是作为三步优化策略的解决方案生成的,旨在确定定义 NURBS 实体形状的所有参数。最后,基于 NURBS 的元模型被纳入与所考虑的应用相关的优化过程中。优化问题被定义为不同标准的加权和,即总印刷时间和每层的平均层间温差。随后使用高保真 FE 模型对获得的解决方案进行后验,结果表明基于 NURBS 的元模型与 FE 模型的预测结果非常吻合。
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引用次数: 0
UNIMAT: An enhanced forming simulation model of prepreg woven fabrics, with application to process optimization for wrinkle mitigation UNIMAT:预浸料编织物的增强成型仿真模型,应用于减少褶皱的工艺优化
IF 2.6 3区 材料科学 Q2 ENGINEERING, MANUFACTURING Pub Date : 2024-10-16 DOI: 10.1007/s12289-024-01856-6
Reza Sourki, Reza Vaziri, Abbas S. Milani

Processing simulation of prepreg fabrics requires considering multiple interactive deformation mechanisms to reliably predict the response of a formed part. However, these mechanisms, especially the evolving fabric properties and their interactions, are often overlooked. In this study, through integration of a series of user-defined subroutines, a unified (enhanced) numerical model (called UNIMAT) is developed to simulate the forming of a plain-weave fiberglass/polypropylene prepreg. The model specifically involves simultaneous incorporation of the fabric nonlinear in-plane and out-of-plane behaviours (including local bending/reverse bending effect with hysteresis), the ply viscous behavior at room temperature, and inter-ply anisotropic friction as a function of the ply orientation, pressure, and slippage. UNIMAT is first validated with a benchmark hemisphere forming test, and is then used for process optimization to minimize wrinkle formation over a complex shape tool under a vacuum bagging process. The model accurately predicted the forming outcomes including the part topology, punch force, shear angles, and wrinkles’ overall severity. The optimization search, through a Convolutional Matrix Adaptation Evolution Strategy (CMA-ES) algorithm, demonstrated that the wrinkles state can be diminished by up to 30% if local constraints on the fabric boundaries are optimally applied using pressure risers (modifiers), prior to the start of the vacuum.

预浸织物的加工模拟需要考虑多种交互变形机制,以可靠地预测成型部件的响应。然而,这些机制,尤其是不断变化的织物特性及其相互作用往往被忽视。在本研究中,通过整合一系列用户定义的子程序,开发了一个统一(增强)数值模型(称为 UNIMAT),用于模拟平纹玻璃纤维/聚丙烯预浸料的成型。具体而言,该模型同时包含了织物在平面内和平面外的非线性行为(包括带有滞后的局部弯曲/反向弯曲效应)、层间在室温下的粘性行为,以及作为层间取向、压力和滑移函数的层间各向异性摩擦。UNIMAT 首先通过基准半球成型测试进行验证,然后用于工艺优化,以最大限度地减少真空袋成型工艺下复杂形状工具的皱纹形成。模型准确预测了成型结果,包括零件拓扑、冲压力、剪切角和皱纹的整体严重程度。通过卷积矩阵自适应进化策略(CMA-ES)算法进行的优化搜索表明,如果在真空开始前使用压力上升器(调节器)对织物边界施加最佳的局部约束,褶皱状态最多可减少 30%。
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引用次数: 0
Accurate real-time modeling for multiple-blow forging 多吹锻造的精确实时建模
IF 2.6 3区 材料科学 Q2 ENGINEERING, MANUFACTURING Pub Date : 2024-10-16 DOI: 10.1007/s12289-024-01861-9
David Uribe, Camille Durand, Cyrille Baudouin, Régis Bigot

Numerical simulations are crucial for predicting outcomes in forging processes but often neglect dynamic interactions within forming tools and presses. This study proposes an approach for achieving accurate real-time prediction of forging outcomes. Initially, a simulation-based surrogate model is developed to replicate key process characteristics related to the billet, enabling prediction of geometry, deformation field, and forging load after an upsetting operation. Subsequently, this model is integrated with a mass-spring-damper model representing the behavior of forging machine and tools. This integration enables the prediction of blow efficiency and energy distribution after each blow, including plastic, elastic, damping, and frictional energy of the upsetting operation. The approach is validated by comparing predictions with experimental results. The coupled model outperformed Finite Element Method (FEM) predictions, exhibiting mean absolute errors (MAE) below 0.1 mm and mean absolute percentage errors (MAPE) below 1% in geometry predictions. Deformation field predictions showed errors below 0.05 mm/mm, and load-displacement curves closely matched experimental data. Blow efficiency predictions aligned well with experimental results, demonstrating a mean absolute error below 1.1%. The observed energy distribution correlated with literature findings, underscoring the model’s fidelity. The proposed methodology presents a promising approach for accurate real-time prediction of forging outcomes.

数值模拟对于预测锻造过程的结果至关重要,但往往会忽略成形工具和压力机内部的动态相互作用。本研究提出了一种实现锻造结果精确实时预测的方法。首先,开发了一个基于仿真的代理模型,以复制与坯料相关的关键工艺特征,从而预测镦锻操作后的几何形状、变形场和锻造载荷。随后,该模型与代表锻造机器和工具行为的质量-弹簧-阻尼器模型集成。通过这种整合,可以预测每次打击后的打击效率和能量分布,包括镦锻操作的塑性能、弹性能、阻尼能和摩擦能。通过将预测结果与实验结果进行比较,对该方法进行了验证。耦合模型的性能优于有限元法(FEM)预测,几何预测的平均绝对误差(MAE)低于 0.1 毫米,平均绝对百分比误差(MAPE)低于 1%。变形场预测误差低于 0.05 毫米/毫米,载荷-位移曲线与实验数据非常吻合。吹气效率预测与实验结果非常吻合,平均绝对误差低于 1.1%。观察到的能量分布与文献研究结果相关,突出了模型的保真度。所提出的方法为准确实时预测锻造结果提供了一种可行的方法。
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引用次数: 0
Identification of coulomb and constant shear frictions in hot aluminum forming by using warm and hot upsetting sliding test 利用温热镦锻滑动试验识别铝热成形中的库仑摩擦和恒定剪切摩擦
IF 2.6 3区 材料科学 Q2 ENGINEERING, MANUFACTURING Pub Date : 2024-10-08 DOI: 10.1007/s12289-024-01858-4
Panuwat Soranansri, André Dubois, Philippe Moreau, Tatsuya Funazuka, Kuniaki Dohda, Laurent Dubar

This study aims to identify the Coulomb friction coefficient and shear friction factor in aluminum forming processes at high temperatures by using the warm and hot upsetting sliding test (WHUST). The presence of pile-up material in front of the contactor when performing the WHUST on aluminum alloys at elevated temperatures modified the contact geometry. Thus, in this study, the pile-up material was derived as a parameter in the analytical equations. It was found that the analytical equation allows to identify the Coulomb friction coefficient directly from the experimental data, while the analytical equation for the shear friction factor requires the yield stress at the contact surface in addition to the experimental data. For the experiment, the WHUST was performed on AA6082-T6 aluminum alloy against AISI H13 hot work tool steel under dry contact conditions at 400 °C. To precisely control the testing temperature, the WHUST apparatus was installed into the heating chamber of the Bruker UMT TriboLab. Finite Element Analysis (FEA) was used to determine the yield stress at the contact surface. In this study, three commercial FEA software, ABAQUS, DEFORM, and FORGE NxT, with two different sets of material data based on Hansel-Spittel material behavior law were carried out to demonstrate the variations in the computational results of the yield stress and its impact on the identification result of the shear friction factor. Finally, the Coulomb friction coefficient was 0.57, and the shear friction factor ranged between 0.76 and 0.90, depending on the yield stress obtained from the FEA software.

本研究旨在通过使用温热镦锻滑动试验(WHUST)来确定高温下铝成形过程中的库仑摩擦系数和剪切摩擦因数。在高温下对铝合金进行温热镦锻滑动测试时,接触器前方的堆积物会改变接触几何形状。因此,在这项研究中,堆积材料被作为一个参数纳入分析方程。研究发现,分析方程可以直接从实验数据中确定库仑摩擦系数,而剪切摩擦系数的分析方程除了实验数据外,还需要接触面的屈服应力。在实验中,在 400 °C 的干接触条件下,对 AA6082-T6 铝合金和 AISI H13 热作工具钢进行了 WHUST 测试。为了精确控制测试温度,将 WHUST 仪器安装在布鲁克 UMT TriboLab 的加热室内。有限元分析(FEA)用于确定接触面的屈服应力。在这项研究中,使用了 ABAQUS、DEFORM 和 FORGE NxT 这三种商用有限元分析软件,并根据 Hansel-Spittel 材料行为定律使用了两组不同的材料数据,以证明屈服应力计算结果的变化及其对剪切摩擦因数鉴定结果的影响。最后,库仑摩擦系数为 0.57,剪切摩擦因数介于 0.76 和 0.90 之间,具体取决于有限元分析软件获得的屈服应力。
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引用次数: 0
Research on the temperature rise mechanism of ultrasonic field-assisted laser cladding 超声波场辅助激光熔覆的温升机理研究
IF 2.6 3区 材料科学 Q2 ENGINEERING, MANUFACTURING Pub Date : 2024-10-08 DOI: 10.1007/s12289-024-01859-3
Li Linjie, Cui Quanwei, Zhou Jianxing, Sun Wenlei, Lu Zhicheng, Sun Haoran, Li Qiang, Guo Wanli

In order to investigate the temperature rise mechanism of laser cladding assisted by ultrasonic energy field, the multi-field heat flow behavior of laser cladding with or without ultrasonic field assistance is studied.Based on the theoretical analysis of laser-powder interaction and thermal effect of ultrasonic energy field, the coupling equation of laser effective heat input and ultrasonic effective heat conversion is obtained.A numerical model of three-dimensional phase-change heat transfer in laser cladding assisted by ultrasonic energy field is established. The solid–liquid phase change and dynamic evolution of the cladding layer are treated by the apparent heat capacity method and the deformation geometry method respectively. The variations of transient heat and velocity with distance based on laser spot center with or without ultrasonic energy field are studied. The effect of ultrasonic energy field on multi-field coupling of heat flow in laser cladding layer is discussed.Then ultrasonic field-assisted laser cladding IN718 experiment is conducted. The surface temperature of the melt pool is tracked in real time. The evolution law of the microstructure of the cladding layer and the distribution of alloying elements are analyzed.The reliability of the model is verified by analyzing the experimental results.The results show that when the laser cladding time is 2 s, the peak temperature and velocity of the molten pool reach the maximum value, which are 2483 K and 0.316 m/s respectively.Under the action of ultrasonic field, when the cladding time is 1 s, 2 s, 3 s and 3.5 s, the peak temperature of the molten pool increases by 26 K, 38 K, 105 K and 121 K respectively. The velocity of the molten pool reaches the maximum when the ultrasonic field acts for 2 s, which reaches 0.319 m/s.With the continuous application of ultrasonic field, the temperature gradient(G) of the cladding layer decreases gradually, and the solidification rate(R) and cooling rate increase. The ratio of temperature gradient to solidification rate (G/R) decreased.In the test range, the temperature variation of the molten pool surface is basically consistent with the simulation results.Ultrasonic field can promote the transformation of microstructure of IN718 cladding layer from columnar dendrites to equiaxial dendrites. The average minimum grain size of the top, middle and bottom of the cladding layer is reduced by 53.70%, 21.8% and 40.82% respectively. The element distribution of the cladding layer is also more uniform.

为了研究超声波能场辅助激光熔覆的温升机理,研究了有无超声波能场辅助的激光熔覆的多场热流行为,基于激光与粉末相互作用和超声波能场热效应的理论分析,得到了激光有效热输入与超声波有效热转换的耦合方程,建立了超声波能场辅助激光熔覆的三维相变传热数值模型。分别采用表观热容法和变形几何法处理了激光熔覆层的固液相变和动态演化。研究了基于激光光斑中心的瞬态热量和速度随距离的变化,以及有无超声波能量场的影响。然后进行了超声波场辅助激光熔覆 IN718 实验。对熔池表面温度进行了实时跟踪。结果表明,当激光熔覆时间为 2 s 时,熔池的峰值温度和峰值速度达到最大值,分别为 2483 K 和 0.316 m/s。在超声场作用下,熔池熔覆时间分别为 1 s、2 s、3 s 和 3.5 s 时,熔池峰值温度分别升高了 26 K、38 K、105 K 和 121 K。随着超声波场的持续作用,熔池的温度梯度(G)逐渐减小,凝固速率(R)和冷却速率增加。在试验范围内,熔池表面的温度变化与模拟结果基本一致。超声场可以促进 IN718 包覆层的微观结构从柱状树枝状转变为等轴树枝状。覆层顶部、中部和底部的平均最小晶粒尺寸分别减小了 53.70%、21.8% 和 40.82%。包层的元素分布也更加均匀。
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引用次数: 0
Electromagnetic blank holding system for flexible segmentation in forming of complex parts: a flow rate-based design, configuration, and validation 用于复杂零件成型中柔性分割的电磁坯料夹持系统:基于流速的设计、配置和验证
IF 2.6 3区 材料科学 Q2 ENGINEERING, MANUFACTURING Pub Date : 2024-09-19 DOI: 10.1007/s12289-024-01853-9
Lei Li, Mengxiao Yang, Yue Wang, Lei Gan, Haihong Huang

Using a segmented holding system can effectively reduce cracking and wrinkling in the stamping process and improve the forming limit of stamped parts. Different segmentation schemes can be achieved flexibly using a blank holding system driven by electromagnetics. However, how to segment the blank holder to fulfill the demand for flow control of complex parts is still an obstacle to overcome. This paper proposes a flow rate-based design of distributed blank holders on demand for complex parts. A theoretical model is first established to analyze the differences in flow rate in the flange. Then, the flow rates are identified circumferentially and radially to find the locations where the changes in rates are large, and these locations are lined and deemed as the boundaries for segmenting holders. Moreover, a design implementation, including location identification and the electromagnetic system configuration for complex parts, is developed to explore the optimal segmentation schemes. To validate the effectiveness, the downscaling part of a car door with the material DP600 is selected to find the segmented scheme, and the corresponding prototypes of integral and segmented electromagnetic dies are then configured. Experimental results show that the thickening ratio is decreased by 15.4%, and the thinning ratio is increased by 22.5% compared with that of the integral blank holder, and the design achieves better quality and fewer segmented pieces compared with the conventional approach. This research assists in designing segmented blank holding systems enabled by electromagnetics and provides a universal segmentation approach to form better-quality complex parts.

使用分段式夹持系统可以有效减少冲压过程中的开裂和起皱,提高冲压件的成形极限。利用电磁驱动的坯料夹持系统可以灵活地实现不同的分段方案。然而,如何对坯料夹持器进行分段,以满足复杂零件的流量控制需求,仍然是一个需要克服的障碍。本文针对复杂零件的需求,提出了基于流速的分布式坯料夹持器设计方案。首先建立一个理论模型来分析法兰中的流速差异。然后,从圆周和径向识别流速,找出流速变化较大的位置,并将这些位置划定为分段夹头的边界。此外,还开发了一种设计实现方法,包括位置识别和复杂零件的电磁系统配置,以探索最佳分割方案。为验证其有效性,选择了汽车车门的降级零件(材料为 DP600)来寻找分段方案,然后配置了相应的整体电磁模和分段电磁模原型。实验结果表明,与整体式坯料夹持器相比,增厚率降低了 15.4%,减薄率提高了 22.5%,与传统方法相比,该设计实现了更好的质量和更少的分段件数。这项研究有助于利用电磁学设计分段坯料夹持系统,并提供了一种通用的分段方法,以形成质量更好的复杂零件。
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引用次数: 0
Evaluating residual stresses in metal additive manufacturing: a comprehensive review of detection methods, impact, and mitigation strategies 评估金属增材制造中的残余应力:检测方法、影响和缓解策略综合评述
IF 2.6 3区 材料科学 Q2 ENGINEERING, MANUFACTURING Pub Date : 2024-09-14 DOI: 10.1007/s12289-024-01855-7
Mumtaz Rizwee, Deepak Kumar

The metal additive manufacturing (MAM) process has most employed methods to build complex geometry and lightweight 3-dimensional (3-D) parts directly from a computerized solid model. Distortion of the printed part is a highly significant concern within the MAM process. This issue is because of the heating and cooling effect of printing process that could accumulate residual stress (RS) during part building up. The aim of the literature work is to present various methodologies for measuring RS in MAM components and to furnish a brief summary of recent developments in the domain. These details aid scholars in the discernment of suitable techniques, namely destructive, semi-destructive, or non-destructive, contingent on their particular applications and the accessibility of these methods. Moreover, it facilitates the explication of their formation mechanisms, effectiveness of process parameters, prediction, and control techniques. The effect of RS on the mechanical characteristics of printed parts is analyzed and presented. Additionally, common defects incorporated into RS are discussed. Moreover, this review article discusses about the future challenges and opportunities in the RS analysis of MAM parts.

金属增材制造(MAM)工艺最常用的方法是直接从计算机实体模型中制造几何形状复杂、重量轻的三维(3-D)零件。在 MAM 工艺中,打印部件的变形是一个非常重要的问题。造成这一问题的原因是打印过程中的加热和冷却效应会在零件成型过程中积累残余应力(RS)。本文献旨在介绍测量 MAM 部件 RS 的各种方法,并简要概述该领域的最新发展。这些详细信息有助于学者们根据其特定应用和这些方法的可及性选择合适的技术,即破坏性、半破坏性或非破坏性技术。此外,它还有助于阐述其形成机制、工艺参数的有效性、预测和控制技术。该书分析并介绍了 RS 对印刷部件机械特性的影响。此外,还讨论了 RS 中常见的缺陷。此外,这篇综述文章还讨论了 MAM 零件 RS 分析的未来挑战和机遇。
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International Journal of Material Forming
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