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Research and analysis of rock breaking mechanical model of single-roller PDC compound bit 单辊 PDC 复合钻头破岩力学模型研究与分析
IF 2 4区 工程技术 Q3 ENGINEERING, MECHANICAL Pub Date : 2024-09-19 DOI: 10.1177/09544062241272439
Chunyan Kong, Mingkun Yang, Yangyang Jin, Yang Li, Zhang Junfu
In order to improve wear resistance and rock breaking efficiency of single-roller bit, a new type of bit, single-roller PDC compound bit is designed. The mechanical model of interaction between PDC teeth and rock of single-roller PDC compound bit is established, and the theoretical calculation formula of resultant force and torque generated by interaction between PDC teeth and rock on cone and bit is obtained. The rock-breaking experiment on the single-roller PDC compound bit are carried out. The results show that with the increase of front inclination angle, the axial force and radial force of PDC teeth decrease greatly at first and then tend to be stable, while the tangential force of PDC teeth decreases at first and then increases slightly; the axial force, radial force and tangential force all increase with the increase of the cutting depth; the maximum values of the three forces all appear at the position of the combined effect of the maximum cutting depth and the minimum front inclination angle. The maximum value of moment [Formula: see text] and [Formula: see text] both appear at the minimum value of h C and δ, while the maximum value of moment [Formula: see text] appears at the minimum value of δ. In order to reduce the acting moment generated by PDC cutter on the roller, the PDC cutter at different position heights can be designed with different front inclination angles. The rock breaking experiment results show that compared with the common single-roller bit, the single-roller PDC compound bit has higher rock breaking efficiency and better development prospect. When drilling in hard limestone, the single-roller PDC compound bit is more energy-efficient under higher WOB.
为了提高单滚轮钻头的耐磨性和破岩效率,设计了一种新型钻头--单滚轮 PDC 复合钻头。建立了单滚柱 PDC 复合钻头 PDC 齿与岩石相互作用的力学模型,得到了 PDC 齿与岩石相互作用在锥体和钻头上产生的结果力和扭矩的理论计算公式。对单辊 PDC 复合钻头进行了破岩实验。结果表明,随着前倾角的增大,PDC 齿的轴向力和径向力先大幅减小后趋于稳定,而 PDC 齿的切向力则先减小后略有增大;轴向力、径向力和切向力均随着切削深度的增大而增大;三力的最大值均出现在最大切削深度和最小前倾角共同作用的位置。为了减小 PDC 刀盘对滚筒产生的作用力矩,可以在不同位置高度的 PDC 刀盘上设计不同的前倾角。破岩实验结果表明,与普通单滚轮钻头相比,单滚轮 PDC 复合钻头具有更高的破岩效率和更好的发展前景。在坚硬的石灰岩中钻进时,单滚轮 PDC 复合钻头在更高的 WOB 下更节能。
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引用次数: 0
Hybrid force-position coordinated control of a parallel mechanism with the number of redundant actuators equal to its DOF 冗余致动器数量等于其 DOF 的并联机构的混合力-位置协调控制
IF 2 4区 工程技术 Q3 ENGINEERING, MECHANICAL Pub Date : 2024-09-17 DOI: 10.1177/09544062241274704
Ming Han, Wangwang Lian, Jianming Liu, Dong Yang, Tiejun Li
To address the demands for precision and load-bearing capacity in the installation of building panels, a hybrid force-position driven robot with redundant actuation has been developed. The mechanical performance of this robot is primarily governed by its central parallel mechanism, which is equipped with redundant actuators matching the degrees of freedom. Non-redundant and redundant actuators are respectively responsible for position and force control. The inclusion of redundant force-driven joints has increased the internal coupling within the mechanism. To enhance the coordination between position and force control, a hybrid synchronized control method based on cross-coupling has been proposed. Initially, kinematic and dynamic models of the parallel structure were established. Under predefined trajectories, the theoretical inputs for each actuator were calculated using inverse kinematics and dynamics. Subsequently, employing the principle of cross-coupling, the torque output from the position actuators was used as feedback. This feedback was processed by a synchronized coordination controller to adjust the output force of the redundant force-driven joints. By adjusting the output force of the redundant actuators, the torque burden on the position actuators was effectively reduced, thereby enhancing the precision of position control. Additionally, under the same load conditions, smaller power actuators could be utilized for position control, reducing the overall weight of the robot and improving its load-to-weight ratio. To validate the effectiveness of the proposed control strategy, a robotic simulation environment was established. The simulation results demonstrated significant reductions in the average torque required by the position actuators across three different trajectories, with reductions of 91.43%, 54.56%, and 80.6% respectively. Finally, the load-bearing capacity and the load-to-weight ratio of the prototype were assessed. Experimental results confirmed that the prototype achieved a load-to-weight ratio of 15.83%, validating the effectiveness of the hybrid synchronized control method based on cross-coupling.
为了满足建筑板材安装对精度和承重能力的要求,我们开发了一种带有冗余执行器的力-位置混合驱动机器人。该机器人的机械性能主要由其中央并联机构控制,该机构配备了与自由度相匹配的冗余致动器。非冗余和冗余致动器分别负责位置和力控制。冗余力驱动关节的加入增加了机构内部的耦合。为了加强位置控制和力控制之间的协调,提出了一种基于交叉耦合的混合同步控制方法。首先,建立了平行结构的运动学和动力学模型。在预定轨迹下,利用逆运动学和动力学计算每个致动器的理论输入。随后,利用交叉耦合原理,将位置执行器输出的扭矩作为反馈。同步协调控制器对该反馈进行处理,以调整冗余力驱动关节的输出力。通过调整冗余执行器的输出力,有效减轻了位置执行器的扭矩负担,从而提高了位置控制的精度。此外,在相同负载条件下,位置控制可以使用较小功率的致动器,从而减轻机器人的整体重量,提高负载重量比。为了验证所提控制策略的有效性,我们建立了一个机器人仿真环境。仿真结果表明,位置执行器在三个不同轨迹上所需的平均扭矩大幅降低,分别降低了 91.43%、54.56% 和 80.6%。最后,对原型的承载能力和负载重量比进行了评估。实验结果证实,原型机的负载重量比达到了 15.83%,验证了基于交叉耦合的混合同步控制方法的有效性。
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引用次数: 0
Oil and gas pipeline robot localization techniques: A review 油气管道机器人定位技术:综述
IF 2 4区 工程技术 Q3 ENGINEERING, MECHANICAL Pub Date : 2024-09-17 DOI: 10.1177/09544062241272431
Yujia Li, Xiao Huang
Globally, pipelines are the primary means for transporting resources. To ensure the safety and reliability of pipeline transportation, it is essential to regularly use pipeline robots for inspections. Localization techniques for these robots are critical as they determine the real-time position and status of the robot inside the pipeline, playing an extremely important role in pipeline operations. Understanding the latest research trends in pipeline robot localization techniques can help advance the overall development of the pipeline field and reduce the potential for research duplication. This paper reviews the global developments in pipeline robot localization techniques over the past decade, categorizing them into three major methods: in-pipe localization, out-of-pipe localization and multi-source information fusion localization. It analyzes the fundamentals, strengths and weaknesses of eight major localization techniques for pipeline robots, identifies the current limitations and solutions in these technologies, discusses the field test analysis and practical design factors, and anticipates the open research challenges and future prospects of this field.
在全球范围内,管道是运输资源的主要手段。为确保管道运输的安全性和可靠性,必须定期使用管道机器人进行检查。这些机器人的定位技术至关重要,因为它们能确定机器人在管道内的实时位置和状态,在管道运行中发挥着极其重要的作用。了解管道机器人定位技术的最新研究趋势有助于推动管道领域的整体发展,减少重复研究的可能性。本文回顾了近十年来全球管道机器人定位技术的发展,将其分为三种主要方法:管道内定位、管道外定位和多源信息融合定位。本文分析了八种主要管道机器人定位技术的基本原理、优缺点,指出了当前这些技术的局限性和解决方案,讨论了现场测试分析和实际设计因素,并预测了该领域的研究挑战和未来前景。
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引用次数: 0
Human-robot collaborative assembly task planning for mobile cobots based on deep reinforcement learning 基于深度强化学习的移动协作机器人的人机协作装配任务规划
IF 2 4区 工程技术 Q3 ENGINEERING, MECHANICAL Pub Date : 2024-09-17 DOI: 10.1177/09544062241271626
Wenbin Hou, Zhihua Xiong, Ming Yue, Hao Chen
Human-Robot Collaborative Assembly (HRCA) offers a novel solution to improve manual-based assembly manufacturing processes. However, the existing HRCA task planning approaches are limited in several aspects, such as inability to be applied effectively to mobile cobots with diverse workspaces and varying skill sets, as well as struggle in meeting the requirements of complex task structures and high-dimensional state spaces. In this paper, an interactive HRCA task planning framework based on finite Markov Decision Process (MDP) is presented, formalizing the Reinforcement Learning (RL) problem. To leverage the mobile and operational advantages of mobile cobots, a Multi-Attribute Hierarchical Task Network (MA-HTN) that enables efficient task decomposition and attribute representation is introduced. Additionally, considering state changes during assembly processes and utilizing Deep Reinforcement Learning (DRL) for handling high-dimensional decision problems, a universal DRL solving environment executed within unit time is constructed. This solving environment is based on a four-channel state diagram capable of reflecting high-dimensional state information that can be directly converted into digital tensor input for neural networks. Furthermore, to address frequent episode restarts in Deep Q-Network (DQN) algorithm and optimize task completion duration, a revival mechanism along with its enhanced algorithm are proposed. Finally, through an automobile fender bracket assembly scenario and an additional case study, the effectiveness of proposed method under varying numbers of tasks and work units is validated.
人机协作装配(Human-Robot Collaborative Assembly,HRCA)为改进基于人工的装配制造流程提供了一种新颖的解决方案。然而,现有的人机协作装配任务规划方法在多个方面存在局限性,例如无法有效应用于具有不同工作空间和不同技能组合的移动协作机器人,以及难以满足复杂任务结构和高维状态空间的要求。本文提出了一个基于有限马尔可夫决策过程(MDP)的交互式 HRCA 任务规划框架,将强化学习(RL)问题形式化。为了充分利用移动协作机器人的移动和操作优势,本文引入了多属性分层任务网络(MA-HTN),该网络可实现高效的任务分解和属性表示。此外,考虑到装配过程中的状态变化,并利用深度强化学习(DRL)处理高维决策问题,构建了在单位时间内执行的通用 DRL 求解环境。该求解环境基于四通道状态图,能够反映高维状态信息,并可直接转换为神经网络的数字张量输入。此外,为了解决深度 Q 网络(DQN)算法中频繁的情节重启问题并优化任务完成时间,提出了复兴机制及其增强算法。最后,通过汽车挡泥板支架装配场景和附加案例研究,验证了所提方法在不同任务数量和工作单元下的有效性。
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引用次数: 0
Investigations of the effect of circular perforations and V-cut on SLTT in DPHE: An experimental analysis using IoT approach 圆孔和 V 形切割对 DPHE 中 SLTT 影响的研究:采用物联网方法进行的实验分析
IF 2 4区 工程技术 Q3 ENGINEERING, MECHANICAL Pub Date : 2024-09-17 DOI: 10.1177/09544062241271743
Manoj Kumar Diwaker, Arvind Kumar
The objective of this research is to explore the characteristics of the mean Nusselt number, friction factor, and enhancement efficiency in a double pipe heat exchanger. The emphasis lies in using short twisted tapes featuring round holes and a V-shaped cut. To conduct the experiment, an IoT-based DPHE setup was employed. In the experiment, various twisted tape configurations were examined to investigate their impact on heat transfer and pressure loss. These configurations included a full-length twisted tape and three short-length tapes with different perforation diameters. The full-length tape, with a twist ratio of x/ b = 4, spanned throughout length of the tube. In contrast, the plain short-length tape and modified short-length tapes, with the same twist ratio, were inserted in the section’s entrance. The shorter inserts, with a length ratio (LR = ls/lf) of 0.50, were compared to the full-length tape. The experimental findings demonstrated that the short-length tapes with LR = 0.50 consistently exhibited lower thermohydraulic performance compared to full-length inserts. Specifically, within the Re range of 4000–24,000, Nusselt numbers and friction factors for the short inserts were approximately 11%, 9.1%, and 6.1% lower, and 20.6%, 16.1%, and 11.2% lower, respectively, compared to the full-length inserts.
本研究的目的是探索双管热交换器中平均努塞尔特数、摩擦因数和增强效率的特征。重点在于使用具有圆孔和 V 形切口的短扭曲带。实验采用了基于物联网的 DPHE 设置。在实验中,对各种扭曲带配置进行了检查,以研究它们对传热和压力损失的影响。这些配置包括一个全长扭曲带和三个具有不同穿孔直径的短长带。全长胶带的扭曲比为 x/ b = 4,横跨整个管道长度。相比之下,具有相同扭曲比的普通短胶带和改良短胶带则插入管段的入口处。长度比(LR = ls/lf)为 0.50 的较短插入物与全长胶带进行了比较。实验结果表明,与全长插入带相比,长度比为 LR = 0.50 的短带始终表现出较低的热液压性能。具体来说,在 4000-24000 Re 范围内,与全长插入带相比,短插入带的努塞尔特数和摩擦因数分别降低了约 11%、9.1% 和 6.1%,以及 20.6%、16.1% 和 11.2%。
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引用次数: 0
Parameter effects on performance of piezoelectric wind energy harvesters based on the interaction between vortex-induced vibration and galloping 基于涡流诱导振动和奔腾之间相互作用的压电风能收集器性能参数效应
IF 2 4区 工程技术 Q3 ENGINEERING, MECHANICAL Pub Date : 2024-09-17 DOI: 10.1177/09544062241272433
Xiaokang Yang, Bo Niu, Kui He, Yahui Liu, Ruijie Xie, Bingke Xu
Our previous research experimentally validated that the interaction between vortex-induced vibration and galloping is an effective method for enhancing the performance of piezoelectric wind energy harvesters under low wind speed conditions. We proposed a distributed-parameter electromechanical coupling model as well. This study aims to investigate the effects of various parameters and optimize the performance of VIV-galloping interactive piezoelectric wind energy harvesters. Initially, we assessed the applicability of the model under different circuit and aerodynamic force conditions and discussed boundary and convergence conditions by replicating previous results. Further, simulations were performed to analyze the effects of the structural parameters of the bluff body and piezoelectric beam. The width or depth of the bluff body significantly influenced the low critical wind speed, interactive occurrence, and electrical output. To achieve a balance between material cost and electrical benefit, we recommend positioning the electrode length from the fixed end with a coverage ratio of at least 60%. Additionally, the output power is highly sensitive to the piezoelectric beam length, but reducing it results in a higher natural frequency and critical wind speed. We fabricated and tested four prototypes, which have demonstrated significantly higher power densities compared with previously reported values at the same wind speed.
我们之前的研究通过实验验证了涡流诱导振动和奔腾之间的相互作用是在低风速条件下提高压电风能收集器性能的有效方法。我们还提出了分布式参数机电耦合模型。本研究旨在研究各种参数的影响,并优化 VIV-galloping 交互式压电风能收集器的性能。首先,我们评估了模型在不同电路和空气动力条件下的适用性,并通过复制以前的结果讨论了边界和收敛条件。此外,我们还模拟分析了崖体和压电梁结构参数的影响。崖体的宽度或深度极大地影响了低临界风速、交互发生率和电输出。为了在材料成本和电气效益之间取得平衡,我们建议从固定端开始定位电极长度,覆盖率至少为 60%。此外,输出功率对压电束长度高度敏感,但减少压电束长度会提高固有频率和临界风速。我们制作并测试了四个原型,与之前报道的相同风速下的功率密度值相比,这些原型的功率密度明显更高。
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引用次数: 0
Study on tool wears in turning Al2219, unhybrid and hybrid metal matrix nano composites by CCD design of experiment 通过 CCD 实验设计研究车削 Al2219、非混合和混合金属基纳米复合材料时的刀具磨损情况
IF 2 4区 工程技术 Q3 ENGINEERING, MECHANICAL Pub Date : 2024-09-17 DOI: 10.1177/09544062241278127
NG Siddesh Kumar, R Suresh, C Durga Prasad, L Shivaramu, NH Siddalingswamy
In this article, Aluminum (Al2219) as a matrix, and particles of n-B4C and MoS2 were chosen as reinforcements. By means of the stir casting technique, the unhybrid and hybrid nano metal matrix composites were prepared. The turning experiment was done through CCD design of experiment with TiN coated carbide insert using a Computer Numerically Controlled Lathe. Also, for turned inserts tool wear measurement was done using a Mitutoyo profile projector with digital readout. By ANOVA the significant contribution for tool wear of each parameter can be identified and the confirmation test is performed in sort to validate the tool wear results. Furthermore, the formation of chips during turning nano MMCs (unhybrid and hybrid) are studied for different feed rates ( f) and cutting speeds ( v) at 0.5 mm constant depth of cut. The outcome showed that both increases in cutting speed and feed rate increase the tool wear. For Al 2219, unhybrid and hybrid nano metal matrix composites feed rate is the important factor. The value of tool wear of the Al2219 matrix is minimal and for unhybrid nano composite is maximum. The leading wear mechanism in unhybrid nano composite is abrasion. Moreover, with the addition of 2%MoS2 in the hybrid nanocomposite the tool wears is decreased. The development of Build Up Edge (BUE) was seen on the flank face of the cutting tool for hybrid nanocomposite at 0.5 mm depth of cut, (v = 114.64 m/min) and (f = 0.441 mm/rev). The obtained % error among the modeled and experimental values is <5% and it is well within the limit. The analysis of chip formation was studied for nanocomposites at lower as well as higher feed rates, cutting speeds, and constant depth of cut during turning.
本文选择铝(Al2219)作为基体,n-B4C 和 MoS2 颗粒作为增强体。通过搅拌铸造技术,制备了非混合和混合纳米金属基复合材料。车削实验采用 CCD 实验设计,使用计算机数控车床加工涂有 TiN 的硬质合金刀片。此外,车削刀片的刀具磨损测量是使用带数字读数的三丰轮廓投影仪进行的。通过方差分析,可以确定每个参数对刀具磨损的重要影响,并对刀具磨损结果进行分类确认测试。此外,还研究了在 0.5 毫米恒定切削深度下,以不同进给速率(f)和切削速度(v)车削纳米 MMC(非混合和混合)时切屑的形成。结果表明,切削速度和进给量的增加都会增加刀具磨损。对于铝 2219、非混合和混合纳米金属基复合材料来说,进给速度是重要因素。Al2219 基体的刀具磨损值最小,而非混合纳米复合材料的刀具磨损值最大。非混合纳米复合材料的主要磨损机制是磨损。此外,在混合纳米复合材料中添加 2%MoS2 后,刀具磨损降低。在切削深度为 0.5 毫米(v = 114.64 米/分钟)和转速为 0.441 毫米/转(f = 0.441 毫米/转)时,混合纳米复合材料的切削工具侧面出现了增生边缘(BUE)。模型值与实验值的误差为 5%,完全在限值范围内。在车削过程中,对纳米复合材料在较低和较高的进给率、切削速度和恒定切削深度下的切屑形成进行了分析研究。
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引用次数: 0
Application of machine learning in rotary ultrasonic-assisted orthopedic bone drilling: A biomechanical pull out in vitro study 机器学习在旋转超声波辅助骨科钻孔中的应用:体外生物力学拔出研究
IF 2 4区 工程技术 Q3 ENGINEERING, MECHANICAL Pub Date : 2024-09-17 DOI: 10.1177/09544062241277739
Raj Agarwal, Jaskaran Singh, Vishal Gupta
Bone drilling is a mechanical, thermal coupling process utilized in orthopedics for provision of rigid internal fixation and treatment of fractured bone. Rotary ultrasonic-assisted bone drilling (RUABD) has achieved noteworthy interest in orthopedic practice due to its ability to enhance biomechanical pullout strength. Drilling parameters used during orthopedic surgeries significantly impact the holding power, initial implant stability and pullout strength. It is difficult for surgeons to predict push-out strength at the interface of bone and screw. An intelligent approach could involve utilizing machine learning (ML) to train and test independent drilling parameters, thereby predicting pullout strength and optimizing holding strength. Therefore, the present work focused on leveraging ML models during RUABD to predict pullout strength at the bone-screw interface. The monitoring of various drilling parameters (including insertion angle, feedrate, rotational speed, and ultrasonic amplitude) was conducted. Multiple ML models were employed to forecast the pullout strength at the interface between bone and screw. The SVR-based ML model exhibited the most accurate prediction among all models, with the lowest error metrics observed. ML algorithms can be leveraged for robust prediction of biomechanical pullout strength to upsurge holding strength and avoid screw loosening.
骨钻孔是矫形外科中的一种机械热耦合工艺,用于提供刚性内固定和治疗骨折骨。旋转超声波辅助骨钻孔(RUABD)能够增强生物力学牵拉强度,因此在骨科实践中受到广泛关注。骨科手术中使用的钻孔参数对持力性、初始植入稳定性和拔出强度有很大影响。外科医生很难预测骨与螺钉界面的拔出强度。一种智能方法是利用机器学习(ML)来训练和测试独立的钻孔参数,从而预测拔出强度并优化固定强度。因此,目前的工作重点是在 RUABD 期间利用 ML 模型预测骨-螺钉界面的拔出强度。对各种钻孔参数(包括插入角、进给速度、旋转速度和超声波振幅)进行了监测。采用多种 ML 模型预测骨与螺钉界面的拔出强度。在所有模型中,基于 SVR 的 ML 模型预测最准确,误差指标最小。可以利用 ML 算法对生物力学拔出强度进行稳健预测,以提高固定强度并避免螺钉松动。
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引用次数: 0
Anisogrid lattice structure in thermoplastic composite by filament gun deposition 通过丝枪沉积在热塑性复合材料中形成茴香网格结构
IF 2 4区 工程技术 Q3 ENGINEERING, MECHANICAL Pub Date : 2024-09-17 DOI: 10.1177/09544062241279014
Fabrizio Quadrini, Daniele Santoro, Loredana Santo
A new method to manufacture thermoplastic composite parts has been used to produce anisogrid lattice structures. Filament gun deposition consists of a hot-melt gun loaded with narrow thermoplastic prepreg tapes. Anisogrid lattice structures have been prototyped with 3 different geometries and 5 different numbers of layers (from 4 to 8) by using a metallic pattern and E-glass/polypropylene prepregs. Scanning calorimetry and bending tests of multi-layer samples have been used to characterize thermoplastic prepregs. Anisogrid lattice structures have been tested under tensile loads. A finite element model has been used to predict mechanical stiffness of these structures by using material properties coming from the sample characterization. Numerical models have been developed with a batch-type parametric approach to rapidly evaluate the combined effect of geometric and material parameters. A good agreement has been found between experimental and numerical data with an average difference about 4%.
一种制造热塑性复合材料部件的新方法已被用于生产异方格网状结构。纤丝枪沉积法由装载窄热塑性预浸带的热熔枪组成。通过使用金属图案和 E 玻璃/聚丙烯预浸料,已制作出 3 种不同几何形状和 5 种不同层数(从 4 层到 8 层)的异方格网格结构原型。多层样品的扫描量热仪和弯曲试验被用来表征热塑性预浸料。在拉伸载荷下测试了茴香网格结构。有限元模型利用样品表征得出的材料特性来预测这些结构的机械刚度。采用批量式参数方法开发的数值模型可快速评估几何参数和材料参数的综合影响。实验数据和数值数据之间的一致性很好,平均差异约为 4%。
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引用次数: 0
Behavior of sandwich structures with 3D-printed auxetic and non-auxetic cores under low velocity impact: Experimental and computational analysis 带有三维打印辅助材料和非辅助材料芯材的夹层结构在低速冲击下的行为:实验和计算分析
IF 2 4区 工程技术 Q3 ENGINEERING, MECHANICAL Pub Date : 2024-09-17 DOI: 10.1177/09544062241277310
Marwa Allouch, Hana Mellouli, Hanen Mallek, Mondher Wali, Fakhreddine Dammak
In recent years, impact-resistant structures are highly sought after in various fields such automotive and aerospace applications as they proved notable performances, garnering significant success. The aim of this study is to assess the behavior of the 3D-printable honeycombs subjected to low velocity impact, for providing insights into absorbed energy for different core designs: hexagonal, auxetic, and rectangular, considering an equal number of cells across all designs. This work reports the computational and experimental studies conducted for sandwich structures under different impact loading. The experimental impact tests are carried out using a drop weight impact-testing machine. The examined specimen comprises two face-sheets and architected cell core fabricated through the Fused Filament Fabrication (FFF) process made of polylactic acid (PLA). Variations in the geometric design of the cells result in the formation of cores with auxetic and non-auxetic topologies. Uniaxial tensile tests are performed to identify the mechanical properties of the involved biopolymer. The second attempt consists on comparing three architectural core structures under impact test using experimental and computational methods. Our findings highlight the specific influence of core topology on energy absorption in 3D-printed sandwich structures. Results indicate that while all three configurations (hexagonal, re-entrant, and rectangular) demonstrate comparable energy absorption values, the specific mechanisms and efficiencies vary, with re-entrant cores exhibiting distinct behaviors under impact.
近年来,抗冲击结构在汽车和航空航天等多个领域备受追捧,因为它们具有显著的性能,获得了巨大的成功。本研究旨在评估三维可打印蜂窝在受到低速冲击时的行为,以便深入了解不同内核设计(六角形、辅助形和矩形)所吸收的能量,同时考虑到所有设计的单元数量相等。这项工作报告了在不同冲击载荷下对夹层结构进行的计算和实验研究。实验性冲击测试使用落锤式冲击试验机进行。受检试样由两张面片和通过聚乳酸(PLA)熔融长丝制造(FFF)工艺制造的拱形单元芯组成。细胞几何设计的变化导致形成具有辅助拓扑和非辅助拓扑的细胞核。通过单轴拉伸试验来确定相关生物聚合物的机械性能。第二次尝试是使用实验和计算方法,比较三种建筑芯材结构在冲击试验中的表现。我们的研究结果强调了核心拓扑结构对 3D 打印夹层结构能量吸收的具体影响。结果表明,虽然所有三种结构(六边形、重入式和矩形)都表现出可比的能量吸收值,但具体的机制和效率却各不相同,重入式夹芯在冲击下表现出截然不同的行为。
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引用次数: 0
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Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science
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