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Body centered cubic (BCC) structure has excellent mechanical properties, but the stress concentration phenomenon at the nodes limits its further development in mechanical properties. At present, the method of adding spherical nodes or variable cross-section pillars is commonly used to alleviate stress concentration at nodes and achieve strengthening design of lattice structures, but there is a lack of research on the influence of the volume ratio of nodes to pillars on the strengthening effect. A new type of variable cross-section pillar based on trigonometric function reduction is designed, and a variable cross-section body centered cubic lattice (VC-BCC) lattice is designed. Dynamic node design is achieved by directly connecting the pillars to explore the optimal node to pillar volume ratio. Theoretical formula estimation of the volume of VC-BCC lattice is carried out, and based on the Timoshenko beam model, the equivalent elastic modulus of VC-BCC lattice is theoretically analyzed. A simplified model is established using the method of equivalent cross-section. Finite element simulation analysis was conducted on VC-BCC lattice with different proportions of node pillars, and lattice specimens were manufactured using selective laser melting technology for quasi-static compression testing. The experimental results show that there is little difference between theoretical calculations and simulation analysis. The maximum stress of the VC-BCC lattice structure is significantly reduced, and the equivalent yield strength is significantly improved. In all analyses, the VC-BCC lattice structure with a variable cross-sectional parameter of 0.6 exhibited excellent performance and had the best overall mechanical properties.
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体心立方(Body Centered Cubic, BCC)点阵结构具有优异的力学性能,然而节点处的应力集中现象限制了其力学性能的进一步发展。目前多采用添加球形节点或变截面支柱的方法来缓解节点应力集中,实现点阵结构的强化设计,但缺乏节点与支柱体积比对强化效果影响的研究。基于三角函数削减的新型变截面支柱,设计变截面体心立方(Variable Cross-section BCC, VC-BCC)点阵结构,并通过支柱的直接相连实现动态节点设计,以探究最佳的节点与支柱体积比。对VC-BCC结构体积进行理论公式估算,同时基于铁木辛柯梁模型,对VC-BCC结构的等效弹性模量进行理论分析,以等截面等效的方法建立简化模型。对不同节点支柱占比的VC-BCC结构进行了有限元仿真分析,通过选区激光熔融技术制造点阵试件进行准静态压缩试验。结果表明,理论计算与仿真分析相差较小,VC-BCC结构最大应力显著降低,且等效屈服强度提升明显。在所有分析中变截面参数为0.6的VC-BCC结构均表现优异,整体力学性能最佳。
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李昊,男,2000年生,湖北鄂州人,在读硕士研究生;主要研究方向为增材制造;E-mail:lihao20002022@163.com。
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李昊,男,2000年生,湖北鄂州人,在读硕士研究生;主要研究方向为增材制造;E-mail:lihao20002022@163.com。
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变截面支柱简化截面, figureFileSmall=L85NaudceGUomk1NmD/IRA==, figureFileBig=5UVPKD96OYWhI+KgSVJrNw==, tableContent=null), ArticleFig(id=1240594179089289838, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1240594158684001181, language=EN, label=Fig.4, caption=
Analysis of lattice structure pillars, figureFileSmall=Cb3yfR0A62OB5U1u0cFstQ==, figureFileBig=79nRgFKp+LCPrAWAIQ7Vbw==, tableContent=null), ArticleFig(id=1240594179202536051, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1240594158684001181, language=CN, label=图4, caption=
点阵结构支柱分析, figureFileSmall=Cb3yfR0A62OB5U1u0cFstQ==, figureFileBig=79nRgFKp+LCPrAWAIQ7Vbw==, tableContent=null), ArticleFig(id=1240594179286422133, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1240594158684001181, language=EN, label=Fig.5, caption=
Seven types of variable cross-section single cells, figureFileSmall=RHJg4cJVxfUBbBZalVXEuA==, figureFileBig=Bok9cQXa0KS1PVFxt3KOKA==, tableContent=null), ArticleFig(id=1240594179424834168, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1240594158684001181, language=CN, label=图5, caption=
7种变截面单胞, figureFileSmall=RHJg4cJVxfUBbBZalVXEuA==, figureFileBig=Bok9cQXa0KS1PVFxt3KOKA==, tableContent=null), ArticleFig(id=1240594179567440509, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1240594158684001181, language=EN, label=Fig.6, caption=
Boundary condition, figureFileSmall=3UDN+RrzIMoRdlULgNYaQg==, figureFileBig=NtTajf3zvmG/+AT9TtWROA==, tableContent=null), ArticleFig(id=1240594179676492417, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1240594158684001181, language=CN, label=图6, caption=
边界条件, figureFileSmall=3UDN+RrzIMoRdlULgNYaQg==, figureFileBig=NtTajf3zvmG/+AT9TtWROA==, tableContent=null), ArticleFig(id=1240594179777155716, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1240594158684001181, language=EN, label=Fig. 7, caption=
Test equipment, figureFileSmall=lbdtdYCQpPCa578WUXiIyA==, figureFileBig=/PdIkDeuCLIIxArbJYObBw==, tableContent=null), ArticleFig(id=1240594179865236101, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1240594158684001181, language=CN, label=图7, caption=
试验设备, figureFileSmall=lbdtdYCQpPCa578WUXiIyA==, figureFileBig=/PdIkDeuCLIIxArbJYObBw==, tableContent=null), ArticleFig(id=1240594179957510792, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1240594158684001181, language=EN, label=Fig.8, caption=
Relative error between volume theory prediction and model measurement under different variable cross-sectional parameters, figureFileSmall=WgzXAv0vklhRdUErubQqVA==, figureFileBig=ovYqjHAd7c49sd+YcWt08w==, tableContent=null), ArticleFig(id=1240594180070757003, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1240594158684001181, language=CN, label=图8, caption=
不同截面参数下体积理论预测与模型测量的相对误差, figureFileSmall=WgzXAv0vklhRdUErubQqVA==, figureFileBig=ovYqjHAd7c49sd+YcWt08w==, tableContent=null), ArticleFig(id=1240594180158837391, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1240594158684001181, language=EN, label=Fig.9, caption=
von Mises stress at 20% relative density, figureFileSmall=4BAp6fFeWIvNXnSVJEROLw==, figureFileBig=3qWkZxbqjLDLt5EQC4Ldrg==, tableContent=null), ArticleFig(id=1240594180242723475, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1240594158684001181, language=CN, label=图9, caption=
20%相对密度下的von Mises应力, figureFileSmall=4BAp6fFeWIvNXnSVJEROLw==, figureFileBig=3qWkZxbqjLDLt5EQC4Ldrg==, tableContent=null), ArticleFig(id=1240594181744284309, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1240594158684001181, language=EN, label=Fig.10, caption=
Maximum von Mises stress of all lattice points, figureFileSmall=yDQdxsI6Lk6koOH+qa6mdA==, figureFileBig=VUlP+qMhQmN1KfZG4PLLiQ==, tableContent=null), ArticleFig(id=1240594181907862169, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1240594158684001181, language=CN, label=图10, caption=
所有点阵的最大von Mises应力, figureFileSmall=yDQdxsI6Lk6koOH+qa6mdA==, figureFileBig=VUlP+qMhQmN1KfZG4PLLiQ==, tableContent=null), ArticleFig(id=1240594182033691291, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1240594158684001181, language=EN, label=Fig.11, caption=
FEA equivalent elastic modulus of all lattice points, figureFileSmall=8xBzb0LKYTXAsATkedED0Q==, figureFileBig=ckaqQtT7RYgD5ybfiADxYA==, tableContent=null), ArticleFig(id=1240594182243406494, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1240594158684001181, language=CN, label=图11, caption=
所有点阵的FEA等效弹性模量, figureFileSmall=8xBzb0LKYTXAsATkedED0Q==, figureFileBig=ckaqQtT7RYgD5ybfiADxYA==, tableContent=null), ArticleFig(id=1240594182335681185, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1240594158684001181, language=EN, label=Fig.12, caption=
Theoretical prediction relative error of equivalent elastic modulus, figureFileSmall=gMZqVGQws8cTmDNjXPGVBw==, figureFileBig=+uZudNytdJf7AyHjY+WPBg==, tableContent=null), ArticleFig(id=1240594182436344483, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1240594158684001181, language=CN, label=图12, caption=
等效弹性模量的理论预测相对误差, figureFileSmall=gMZqVGQws8cTmDNjXPGVBw==, figureFileBig=+uZudNytdJf7AyHjY+WPBg==, tableContent=null), ArticleFig(id=1240594182507647655, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1240594158684001181, language=EN, label=Fig.13, caption=
VC-BCC lattice specimens under different parameter Q, figureFileSmall=P84GYJdiMvHxftJtcMAkxg==, figureFileBig=Drooe0w1WntAM2iXdQj11w==, tableContent=null), ArticleFig(id=1240594182595728042, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1240594158684001181, language=CN, label=图13, caption=
不同参数Q下的VC-BCC点阵试件, figureFileSmall=P84GYJdiMvHxftJtcMAkxg==, figureFileBig=Drooe0w1WntAM2iXdQj11w==, tableContent=null), ArticleFig(id=1240594182675419820, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1240594158684001181, language=EN, label=Fig.14, caption=
Stress-strain curves of compression test, figureFileSmall=RhTgj+0M9Uf/0SK/IBzU1w==, figureFileBig=BJbt3uDseBA7yslOOgEAeg==, tableContent=null), ArticleFig(id=1240594182759305902, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1240594158684001181, language=CN, label=图14, caption=
压缩试验的应力-应变曲线, figureFileSmall=RhTgj+0M9Uf/0SK/IBzU1w==, figureFileBig=BJbt3uDseBA7yslOOgEAeg==, tableContent=null), ArticleFig(id=1240594182843191985, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1240594158684001181, language=EN, label=Tab.1, caption=
Load setting
, figureFileSmall=null, figureFileBig=null, tableContent=
相对密度 Relative density ρ/% | 载荷 Load F/N | 最大von Mises应力 Maximum von Mises stress σe/MPa |
|---|
| 15 | 75 | 231.88 |
| 20 | 85 | 214.48 |
| 25 | 125 | 225.29 |
| 30 | 200 | 224.73 |
| 35 | 290 | 230.06 |
), ArticleFig(id=1240594182918689460, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1240594158684001181, language=CN, label=表1, caption=
载荷设置
, figureFileSmall=null, figureFileBig=null, tableContent=
相对密度 Relative density ρ/% | 载荷 Load F/N | 最大von Mises应力 Maximum von Mises stress σe/MPa |
|---|
| 15 | 75 | 231.88 |
| 20 | 85 | 214.48 |
| 25 | 125 | 225.29 |
| 30 | 200 | 224.73 |
| 35 | 290 | 230.06 |
), ArticleFig(id=1240594182989992630, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1240594158684001181, language=EN, label=Tab.2, caption=
Result of compression test
, figureFileSmall=null, figureFileBig=null, tableContent=
| 参数Parameter | BCC | Q |
|---|
| 0.2 | 0.3 | 0.4 | 0.5 | 0.6 | 0.7 |
|---|
弹性模量Elastic modulus E/GPa | 2.4 | 3.9 | 4.1 | 4.5 | 3.9 | 3.8 | 3.3 |
屈服强度Yield strength σs /MPa | 7 | 12 | 15 | 11 | 10 | 10 | 8 |
), ArticleFig(id=1240594183073878713, tenantId=1146029695717560320, journalId=1227999626482147330, articleId=1240594158684001181, language=CN, label=表2, caption=
压缩试验结果
, figureFileSmall=null, figureFileBig=null, tableContent=
| 参数Parameter | BCC | Q |
|---|
| 0.2 | 0.3 | 0.4 | 0.5 | 0.6 | 0.7 |
|---|
弹性模量Elastic modulus E/GPa | 2.4 | 3.9 | 4.1 | 4.5 | 3.9 | 3.8 | 3.3 |
屈服强度Yield strength σs /MPa | 7 | 12 | 15 | 11 | 10 | 10 | 8 |
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