增材制造八角桁架点阵结构材料的力学行为
PDF下载 (215)李鉴石,王永刚,史同亚,方嘉铖.增材制造八角桁架点阵结构材料的力学行为[J].宁波大学学报(理工版),2022,35(1):82-89.DOI:
LI Jianshi,WANG Yonggang,SHI Tongya,FANG Jiacheng.Mechanical behavior of the additively manufactured metallic octet-truss lattice materials[J].Journal of Ningbo University(Natural Science & Engineering Edition),2022,35(1):82-89.DOI:
| Title: | Mechanical behavior of the additively manufactured metallic octet-truss lattice materials |
| 作者: | 李鉴石, 王永刚, 史同亚, 方嘉铖 |
| Author(s): | LI Jianshi, WANG Yonggang, SHI Tongya, FANG Jiacheng |
| 关键词: | 点阵结构; 金属增材制造技术; 变形模式; 数值模拟; 能量吸收 |
| Keywords: | lattice structure; additive manufacturing technology; deformation mode; numerical simulation; energy absorption |
| 分类号: | O347.4 |
| 文献标识码: | A |
| 摘要: | 基于激光选区熔化增材制造技术(SLM), 以GP1不锈钢为母材, 制备4种相对密度的八角桁架点阵结构试样, 开展了准静态单轴压缩和直接撞击式霍普金森压杆实验, 并结合显式有限元计算模拟, 研究了相对密度和加载速率对八角桁架点阵结构试样在力学响应、变形模式和吸能特性的影响. 结果显示: (1)相对密度是影响八角桁架点阵结构材料力学响应的关键参数, 屈服载荷随着相对密度基本呈线性增长, 并且表现出明显的应变率强化效应; (2)在准静态压缩下, 随着相对密度增大, 八角桁架点阵结构的变形模式由弯扭屈曲模式逐渐向稳定屈服模式转变; 而在冲击压缩下, 八角桁架点阵结构的变形模式随着冲击速度由对称稳定变形模式向非对称逐渐压垮模式转变; (3)八角桁架点阵结构总吸能随着相对密度线性增大, 而比吸能随着相对密度呈现双线性变化, 在相对密度30%处出现拐折, 当相对密度高于30%后, 比吸能增大缓慢; (4)与准静态加载相比, 冲击加载下八角桁架点阵结构的总吸能和比吸能都显著提升. |
| Abstract: | Based on selective laser melting (SLM) additive manufacturing technology, octet-truss lattice material with different relative densities were prepared with GP1 stainless steel as the base material. Quasi-static uniaxial compression experiments and direct impact Hopkinson barex periments as well as finite element simulations were carried out to study the influence of relative density and loading rate on the mechanical response, deformation mode and energy absorption foroctet-truss lattice material. Results show that relative density is a key parameter that affects the mechanical response of the octet-truss lattice structure. The critical yield loads increase linearly with the relative density, and it exhibits an obvious strain rate strengthening effect. Under quasi-static compression loading condition, with the increase of relative density, the deformation mode of the octet-truss lattice material changes from an unstable twist mode to a stable buckling mode. But under the impact compression loading condition, with the increase of the impact velocity, the deformation mode of the octet-truss lattice material changes from a symmetrical stable buckling mode to asymmetrical gradually collapsed mode. The total energy absorption of the octet-truss lattice material is a monotonically increasing function of the relative density, but lattice material of relative densities around 0.3 features high specific energy absorption capability. Compared with the results under quasi-static compression loading, the total energy absorption and specific energy absorption of the octet-truss lattice materials are significantly improved under impact compression loading. |
| 参考文献 /References: | [1] 易长炎, 柏龙, 陈晓红, 等. 金属三维点阵结构拓扑构型研究及应用现状综述[J]. 功能材料, 2017, 48(10):10055-10065. [2] 张钱城, 卢天健, 闻婷. 轻质高强点阵金属材料的制备及其力学性能强化的研究进展[J]. 力学进展, 2010, 40(2):157-169. [3] 钱海峰, 张振华, 牟金磊, 等. 金字塔点阵夹芯板单元结构准静态压缩性能研究[J]. 中国舰船研究, 2013, 8(5):46-51. [4] 张蒙. 金字塔金属点阵夹芯结构的制备及力学性能研究[D]. 哈尔滨: 哈尔滨工业大学, 2014. [5] Feng L J, Xiong J, Yang L H, et al. Shear and bending performance of new type enhanced lattice truss structures [J]. International Journal of Mechanical Sciences, 2017, 134:589-598. [6] Maconachie T, Leary M, Lozanovski B, et al. SLM lattice structures: Properties, performance, applications and challenges[J]. Materials & Design, 2019, 183:108137. [7] Gümrük R, Mines R A W, Karadeniz S. Static mechanical behaviours of stainless steel micro-lattice structures under different loading conditions[J]. Materials Science and Engineering A, 2013, 586:392-406. [8] 郑权, 冀宾, 李昊, 等. 基于增材制造的多层金字塔点阵夹芯板抗压缩性能[J]. 航空材料学报, 2018, 38(3):77-82. [9] Bai L, Gong C, Chen X H, et al. Mechanical properties and energy absorption capabilities of functionally graded lattice structures: Experiments and simulations[J]. International Journal of Mechanical Sciences, 2020, 182:105735. [10] Deshpande V S, Fleck N A, Ashby M F. Effective properties of the octet-truss lattice material[J]. Journal of the Mechanics and Physics of Solids, 2001, 49(8):1747-1769. [11] Dong L, Deshpande V, Wadley H. Mechanical response of Ti-6Al-4V octet-truss lattice structures[J]. Interna- tional Journal of Solids and Structures, 2015, 60/61:107- 124. [12] Gangireddy S, Komarasamy M, Faierson E J, et al. High strain rate mechanical behavior of Ti-6Al-4V octet lattice structures additively manufactured by selective laser melting (SLM)[J]. Materials Science and Engineering A, 2019, 745:231-239. [13] Tancogne-Dejean T, Spierings A B, Mohr D. Additively- manufactured metallic micro-lattice materials for high specific energy absorption under static and dynamic loading[J]. Acta Materialia, 2016, 116:14-28. [14] 陈浩, 郭鑫, 宋力. 直接撞击式大变形霍普金森压杆实验技术[J]. 宁波大学学报(理工版), 2018, 31(4):70-73. [15] 陈子博, 谢普初, 刘东升, 等. 基于广义波阻抗梯度飞片的准等熵压缩技术[J]. 爆炸与冲击, 2019, 39(4):52-60. [16] 史同亚, 刘东升, 陈伟, 等. 激光选区熔化增材制造GP1不锈钢动态拉伸力学响应与层裂破坏[J]. 爆炸与冲击, 2019, 39(7):52-63. |
| 备注/Memo: | 收稿日期: 2021－05－13. 宁波大学学报（理工版）网址: http://journallg.nbu.edu.cn/ 基金项目: 国家自然科学基金（11972202）. 第一作者: 李鉴石（1995－）, 男, 四川遂宁人, 在读硕士研究生, 主要研究方向: 冲击动力学. E-mail: 1037306819@qq.com *通信作者: 王永刚（1976－）, 男, 江苏涟水人, 博士/教授, 主要研究方向: 冲击动力学. E-mail: wangyonggang@nbu.edu.cn 宁波大学学报（理工版）网址：http://journallg.nbu.edu.cn/ |
