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Biomechanical finite element analysis of typical tibiotalar arthrodesis

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Medicine in Novel Technology and Devices 2021年第3期11卷 226-235页

作者： Fangbo Bing Chi Wei Pan Liu Zhenzi Li Yu Deng zuoqi zhang Shaobo Zhu School of Civil Engineering Wuhan UniversityWuhanHubei430072PR China Zhongnan Hospital of Wuhan University WuhanHubei430071PR China

Tibiotalar arthrodesis(TTA)is a common surgical method for post-traumatic arthrosis and primary osteoarthrosis of *** screw fixation exhibits such advantages of higher fusion rate and fewer complications that it has become the mainstream surgical procedure in ***,there are still disputes over the choice of screw type,number and nailing *** this study,a 3D model of tibiotalar joint was established based on CT *** representative types of screws were modeled according to their real *** was done in Hypermesh 2017,and the finite element simulations of different surgical schemes and postoperative ankle joint movements were performed via Abaqus *** stress distribution in tibiotalar joints and screws,interarticular displacement,and screw deformation were extracted for comparative *** results show that:(1)the three-screw fixation scheme with smaller displacements and higher contact pressure is superior to the two-screw one;(2)the relative displacements of the tibia and talus of full-thread screw under all loads were reduced by approximately 50%compared with those of lag screw,showing better stability;(3)the 60scheme is more favorable for joint fusion and more stable under vertical load,while the 75has the best bending resistance;(4)the stress and strain distributions in screws indicate that the screw break is most likely to happen near its contact region with the bone inlet,the maximum stress reaches 212.2 *** study is of great significance for the selection and optimization of the surgical plan.

关键词： Surgical design and optimization Screw type and number Stability Stress and strain analyses Finite element method

On the hierarchy number of load-bearing biological materials:the larger,the better?

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On the hierarchy number of load-bearing biological materials...

Direct influence of surface shear stress on the bending stiffness of cantilever beam

第十一届全国生物力学学术会议暨第十三届全国生物流变学学术会议

作者： zuoqi zhang Department of Engineering Mechanics Wuhan University

Objective:Structural hierarchy is a universal strategy for load-bearing biological materials to achieve superior mechanical properties from relatively weak constituent materials(brittle biominerals and soft proteins).Previous studies of load-bearing biological materials based on a self-similar hierarchical model showed that the larger the hierarchy number,the better the overall mechanical properties Contrarily,experimental observations re-

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Direct influence of surface shear stress on the bending stif...

Load-Transfer Capacity and Failure behaviors of crosslinked interfaces in collagen-mimic carbon nanotube bundles

中国力学大会——2013

作者： Liu Bin Shi Mingxing zhang zuoqi Department of Aeronautics & Astronautics Engineering Tsinghua University

We perform both theoretical analyses and finite element simulations to demonstrate for the first time that without changing the material tangent stiffness,residual stress within the beam can directly influence the bending stiffness of the *** direct influence arises from two origins:geometry nonlinearity and the Poisson’s ratio *** a cantilever beam with adsorbed macromolecules on its surfaces,we find that longer

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Load-Transfer Capacity and Failure behaviors of crosslinked ...

颗粒局域共振增强仿生复合材料中应力波的衰减行为

中国力学大会-2017暨庆祝中国力学学会成立60周年大会

作者： Min Lin Xiaoyu Sun Wen Xie zuoqi zhang School of Civil Engineering Wuhan University Unité Matériaux et Transformations UMR 8207 CNRS/Université Lille1 Suzhou Institute of Wuhan University

Weak interface has been a long-standing bottleneck critically hindering the exploitation of the ultra-high stiffness and strength of carbon nanotubes(CNTs) as reinforcement materials. Recent progress of technologies to introduce strong inter-tube crosslinks in CNT bundles/fibers makes the cross-linked interface design and optimization of highly practical interest. Inspired by the structure of collagen fibril,a covalently cross-linked interface design for ultra-strong CNT bundles has attracted a lot of attentions. In the present paper,molecular dynamics simulations were conducted to systematically study the load-transfer capacity and failure behaviors of the crosslinked interface,including the influence of crosslink type(length),density,and interface length. We found that even a small number of covalent crosslinks are able to significantly enhance the interface in stiffness and strength. Depending on the interface length and crosslink density,the shorter crosslinks usually yield higher interface stiffness while the longer crosslinks generally produce higher interface strength. There are three major failure modes found in the simulations as the crosslink density and interface length increase,namely the abrupt interface failure,the gradual interface failure and the CNT break. A forth failure mode was also unveiled upon a critical and optimal interface design,in which bond breaks propagate simultaneously and gradually in crosslinked interfaces and CNTs. The optimal design is highly desired in engineering applications since it can simultaneously provide superior stiffness,strength and toughness. The current study provides useful guidelines for the interface design of collagen-inspired CNT bundles,in which inter-tube crosslink is a crucial feature for their integrity and extraordinary mechanical properties.

关键词： staggered pattern covalent crosslink bioinspired fiber design

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复合材料学报 2024年第9期41卷 4909-4918页

作者：洪爽于瀛洋张作启武汉大学土木工程建筑学院武汉430072 杭州市富阳区发展和改革局杭州311400 建筑物检测与加固教育部工程研究中心武汉430072

快速衰减应力波的冲击防护复合材料在民防、装甲、舰船等许多工业领域有着巨大的需求。受蜻蜓翅膀的启发,本文提出了基于颗粒局域共振原理的仿生微结构防护复合材料设计。研究发现:(1)当入射波频率接近局域共振单元的固有频率时,局域共... 详细信息

快速衰减应力波的冲击防护复合材料在民防、装甲、舰船等许多工业领域有着巨大的需求。受蜻蜓翅膀的启发,本文提出了基于颗粒局域共振原理的仿生微结构防护复合材料设计。研究发现:(1)当入射波频率接近局域共振单元的固有频率时,局域共振机制被最大程度激发,大量的入射应力波能量转化为颗粒的机械能;(2)单元固有频率随重芯直径、密度、软涂层厚度增大而减小,随软涂层弹性模量增大而增大;(3)在复合材料中引入不同固有频率单元的混杂设计,可以实现对宽频域入射应力波的高效衰减。本研究对于利用局域共振原理和仿生微结构开发设计高性能冲击防护复合材料具有指导意义。

关键词：应力波仿生微结构防护材料衰减行为局域共振

Nanoindentation Study on Mechanical Properties of Nano-SiO2/Dental Resin Composites

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Journal of Materials Science and Chemical Engineering 2018年第4期6卷 57-64页

作者： Chao Zha Jianhua Hu Ainong Li Shangyu Huang Hanxing Liu Gang Chen Anqi Lei zuoqi zhang Bei Li Zhengzhi Wang International School of Materials Science and Engineering Wuhan University of Technology Wuhan China School of Materials Science and Engineering Wuhan University of Technology Wuhan China Research Center for Materials Genome Engineering Wuhan University of Technology Wuhan China Department of Engineering Mechanics School of Civil Engineering Wuhan University Wuhan China State Key Laboratory of Materials Processing and Die & Mould Technology Huazhong University of Science and Technology Wuhan China

The micro/nano-scale indentation tests were performed to explore the performance of bisphenol-α-glycidyl methacrylate (Bis-GMA)/triethylene glycol dimethacrylate (TEGDMA) dental resin composites. The effect of the filling content of nano-SiO2 particles on the mechanical properties of the dental composites was studied as well. The experimental results showed that the incorporation of the nano-SiO2 particles at low concentrations (up to 10 wt.%) can apparently increase the hardness and elastic modulus of the dental rein composites. The plasticity index indicates a best elastic recovery capability at a proper amount (4 wt.%) of the nanoparticles. Combined with the infrared spectrum, the mechanical enhancement mechanisms of the dental resin composites were analyzed.

关键词： Indentation SiO2 Nanoparticles Dental Resin Composites Mechanical Properties

基于生物力学螺旋结构教具研制和实验课堂设计

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力学与实践 2022年第2期44卷 423-426页

作者：原亚南张作启武汉大学土木建筑工程学院武汉430072

对于复合材料微结构设计,笔者注意到在利用两相或多相普通材料来制备高性能复合材料方面,大自然给出了非常好的范例。笔者开设了复合材料力学设计课程,旨在培养学生们对这一新型仿生设计有更多理解。因此,本文提出了一种预浸料自动铺设... 详细信息

对于复合材料微结构设计,笔者注意到在利用两相或多相普通材料来制备高性能复合材料方面,大自然给出了非常好的范例。笔者开设了复合材料力学设计课程,旨在培养学生们对这一新型仿生设计有更多理解。因此,本文提出了一种预浸料自动铺设仿龙虾钳表皮螺旋微结构设计平台,使同学们在课堂上实现精确的预浸料铺设角度的控制,为仿照生物组织中螺旋微结构来优化层合板力学性能等教学思路提供了可行的实验条件。

关键词：自制教具仿生螺旋复合材料预浸料旋转平台

矿物凸起在贝壳珍珠母界面中摩擦耗能机理的研究

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固体力学学报 2021年第1期42卷 45-52页

作者：温轶原亚南张作启武汉大学土木建筑工程学院力学系武汉430072

论文建立了珍珠母矿物质板相对滑移时表面矿物凸起相互攀爬摩擦的理论模型,得到了界面等效摩擦性能可以表示为两个无量纲参数的函数:凸起高宽比α=A/l、凸起高度与板厚度比β=A/D.理论预测与有限元模拟结果对比,两者符合良好,验证了理... 详细信息

论文建立了珍珠母矿物质板相对滑移时表面矿物凸起相互攀爬摩擦的理论模型,得到了界面等效摩擦性能可以表示为两个无量纲参数的函数:凸起高宽比α=A/l、凸起高度与板厚度比β=A/D.理论预测与有限元模拟结果对比,两者符合良好,验证了理论模型的有效性.通过理论和计算分析,得到以下结论:(1)矿物质板表面凸起的存在对板间界面摩擦起到了显著的增强作用;(2)等效界面摩擦系数随α增大而增大,但与β无关;(3)α和β的提高均能提高界面等效剪切强度和摩擦耗能.该研究揭示了矿物质板表面凸起的微结构特征对界面摩擦耗能机制的影响规律,对于理解珍珠母贝壳等承力生物材料的界面增强增韧机理和指导相关仿生复合材料的设计有重要意义.

关键词：珍珠母界面凸起界面增强摩擦耗能

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海上油气田经济评价阶段的划分及内容

石化技术 2015年第4期22卷 16-17页

作者：张作起中海油研究总院北京100028

本文对海上油气田经济评价各个阶段进行了系统划分,共五个阶段,包括区块经济评价、预探目标经济评价、提交石油或天然气探明储量经济评价、油气田可行性研究报告及总体开发方案报告编制阶段的经济评价和退出矿区的经济评价。给出了各阶... 详细信息

本文对海上油气田经济评价各个阶段进行了系统划分,共五个阶段,包括区块经济评价、预探目标经济评价、提交石油或天然气探明储量经济评价、油气田可行性研究报告及总体开发方案报告编制阶段的经济评价和退出矿区的经济评价。给出了各阶段经济评价的概念,明确了各阶段经济评价工作的内容,其目的是为了突出经济评价在各阶段的重要性,建立经济评价的工作程序,减少各环节的决策失误,进一步提高海上油气田勘探开发的经济效益。

关键词：区块预探目标储量可行性研究 ODP经济评价净现值