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| 1 | An identification method for enclosed voids restriction in manufacturability design for additive manufacturing structures显示文摘生产的添加剂(AM ) 技术例如选择激光 sintering (SLS )( 频分多路复用) 并且熔化免职建模,为复杂部分的直接生产成为了强大的工具。在生产技术的这突破做新几何特征和可能的多重材料的制造。经过关于经常集中于怎么获得结构或部分的需要的功能的性能的图案和设计方法的研究,象生产 AM 的限制一样的特定的生产能力被忽视。然而,在 AM 过程的固有的限制应该在设计过程被考虑。在这篇论文,围住的虚空,生产 AM 的限制的一种类型,被调查。在数学,因为稳固的结构是 simplyconnected,围住表示的虚空限制。我们建议对为避免的简单地连接的限制的相等的描述在结构围住虚空,命名同样虚拟的温度方法(VTM ) 。在这个方法,假定在结构的虚空与高热电导率充满虚拟加热材料,稳固的区域与低热电导率充满另一虚拟材料。一旦围住的虚空在结构存在,结构的最大的温度价值将很高。在这个方法之上基于, simplyconnected 限制等价于最大的温度限制。并且这个方法能容易被用来在拓扑学优化提出简单地连接的限制。这个描述方法的有效性被几个例子说明。在拓扑学之上基于优化, 3D 伸臂横梁的一个例子被用来说明在 manufacturability 和功能之间的交易。而且,三优化结构被频分多路复用技术制作进一步显示为 AM 在设计阶段考虑简单地连接的限制的必要性。 | Shutian LIU Quhao LI Wenjiong CHEN Liyong TONG Gengdong CHENG | 2015 | Frontiers of Mechanical Engineering2015，10，2： | 18 |
| 2 | A Realization Method for Transforming a Topology Optimization Design into Additive Manufacturing Structures显示文摘 | Shutian Liu Quhao Li Junhuan Liu Wenjiong Chen Yongcun Zhang | 2018 | Engineering2018，4，2： | 16 |
| 3 | Concurrent topology optimization design of stiffener layout and cross-section for thin-walled structures显示文摘Stiffened plates or shells are widely used in engineering structures as primary or secondary load-bearing components.How to design the layout and sizes of the stiffeners is of great significance for structural lightweight.In this work,a new topology optimization method for simultaneously optimizing the layout and cross-section topology of the stiffeners is developed to solve this issue.The stilfeners and base plates are modeled by the beam and shell elements,respectively,significantly reducing the computational cost.The Giavotto beam theory,instead of the widely employed Euler or Timoshenko beam theory,is applied to model the stiffeners for considering the warping deformation in evaluating the section stiffness of the beam.A multi-scale topology optimization model is established by simultaneously optimizing the layout of the beam and the topology of the cross-section.The design space is significantly expanded by optimizing these two types of design variables.Several numerical examples are applied to illustrate the validity and effectiveness of the proposed method.The results show that the proposed two-scale optimization approach can generate better designs than the single-scale method. | Quhao Li Yongxin Qu Yunfeng Luo Shutian Liu | 2021 | Acta Mechanica Sinica2021，37，3： | 2 |
| 4 | Transcription of inte- gron-harboured gene cassette impacts integration efficiency in class 1 integron显示文摘 | Wei Quhao Jiang Xiaofei Li Min | 2011 | Mol Microbiol2011，80，5： | 1 |
| 5 | Multiscale design and biomechanical evaluation of porous spinal fusion cage to realize specified mechanical properties显示文摘Backgrou nd Dense titanium(Ti)fusion cages have been commonly used in transforaminal lumbar interbody fusion.However,the stiffness mismatch between cages and adjacent bone endplates increases the risk of stress shielding and cage subsidence.Methods The current study presents a multiscale optimization approach for porous Ti fusion cage development,including microscale topology optimization based on homogenization theory that obtains a unit cell with prescribed mechanical properties,and macroscale topology optimization that determines the layout of framework structure over the porous cage while maintaining the desired stiffness.The biomechanical performance of the designed porous cage is assessed using numerical simulations of fusion surgery.Selective laser melting is employed to assists with fabricating the designed porous structure and porous cage.Results The simulations demonstrate that the designed porous cage increases the strain energy density of bone grafts and decreases the peak stress on bone endplates.The mechanical and morphological discrepancies between the as-designed and fabricated porous structures are also described.Conclusion From the perspective of biomechanics,it is demonstrated that the designed porous cage contributes to reducing the risk of stress shielding and cage subsidence.The optimization of processing parameters and post-treatments are required to fabricate the designed porous cage.The present multiscale optimization approach can be extended to the development of cages with other shapes or materials and further types of orthopedic implants. | Hongwei Wang Yi Wan Quhao Li Xinyu Liu Mingzhi Yu Xiao Zhang Yan Xia Qidong Sun Zhanqiang Liu | 2022 | Bio-Design and Manufacturing2022，5，2： | 1 |
| 6 | Fast dynamic performance optimization of complicated beam-type structures based on two new reduced physical models显示文摘 | Wensheng Wang Gengdong Cheng Quhao Li | 2013 | Engineering Optimization2013，，7： | 1 |
| 7 | Fast dynamic performance optimization of complicated beam-type structures based on two new reduced physical models显示文摘 | Wensheng Wang Gengdong Cheng Quhao Li | 2013 | Engineering Optimization2013，，7： | 1 |
| 8 | Topology Optimization Method for Microscale Structures Described with Integral Nonlocal Theory显示文摘The integration of additive manufacturing and topology optimization makes it possible to fabricate complex configurations,especially for microscale structures,which can guarantee the realization of high-performance structural designs.However,topology results often contain microstructures(several multicellular scales)similar to the characteristic length of local macrostructures,leading to errors in structural performance analysis based on classical theories.Therefore,it is necessary to consider the size effect in topology optimization.In this paper,we establish a novel topology optimization model utilizing the integral nonlocal theory to account for the size effect.The approach consists of an integral constitutive model that incorporates a kernel function,enabling the description of stress at a specific point in relation to strain in a distant field.Topology optimization structures based on nonlocal theory are presented for some benchmark examples,and the results are compared with those based on classical medium theory.The material layout exhibits significant differences between the two approaches,highlighting the necessity of topology optimization based on nonlocal theory and the effectiveness of the proposed method. | Jiayu Li Quhao Li Shutian Liu | 2024 | Acta Mechanica Solida Sinica2024，37，1： | 0 |
| 9 | Introduction to the Special Issue on Novel Methods of Topology Optimization and Engineering Applications显示文摘Topology optimization,aiming to allocate the available material to maximize system performance while satisfying multiple constraints,has experienced tremendous progress.This special issue focuses on the new progress of topology optimization methods and their applications,especially theoretical development,numerical implementation and potential applications. | Kai Long Xiaodong Huang Zunyi Duan Xuan Wang Quhao Li | 2022 | Computer Modeling in Engineering & Sciences2022，，4： | 0 |
| 10 | Oblique Cutting Based Mechanical Model for Insertion Torque of Dental Implant显示文摘The insertion torque of a dental implant is an important indicator for the primary stability of dental implants.Thus,the preoperative prediction for the insertion torque is crucial to improve the success rate of implantation surgery.In this present research,an alternative method for prediction of implant torque was proposed.First,the mechanical model for the insertion torque was established based on an oblique cutting process.In the proposed mechanical model,three factors,including bone quality,implant geometry and surgical methods were considered in terms of bone-quality coefficients,chip load and insertion speeds,respectively.Then,the defined bone-quality coefficients for cancellous bone with the computed tomography(CT)value of 235–245,345–355 and 415–425 Hu were obtained by a series of insertion experiments of IS and ITI implants.Finally,the insertion experiments of DIO implants were carried out to verify the accuracy of developed model.The predicted insertion torques calculated by the mechanical model were compared with those acquired by insertion experiments,with good agreement,the relative error being less than 15%.This method allows the insertion torque for different implant types to be quickly established and enhances prediction accuracy by considering the effects of implants’geometries and surgical methods. | Luli Li Song Zhang Quhao Li Cuirong Bian Airong Zhang | 2022 | Chinese Journal of Mechanical Engineering2022，35，3： | 0 |
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