Gau Jenn-Terng, Zhang Kechuang, Zhu Jiaqi
Department of Mechanical Engineering, Northern Illinois University, DeKalb, IL 60115, USA.
Micromachines (Basel). 2024 Aug 29;15(9):1096. doi: 10.3390/mi15091096.
In order to understand the formability of as-received tempered commercial pure titanium grade 2 foils (CP Ti Gr2) with a thickness of 38 µm, a series of micro limited dome height (µ-LDH) tests were conducted in quasi-static speed (0.01 mm/s) at room temperature without the use of a lubricant. A technique developed at NIU was also used to create micro-circular grids (50 μm) on the as-received material. The forming limit curve (FLC) of the CP Ti Gr2 foils was obtained through the proposed µ-LDH test. For having mechanical properties of the CP Ti Gr2 foils for LS-Dyna FEA (Finite Element Analysis) simulations, a series of tensile tests in three directions were also conducted at room temperature with the same speed. The obtained FLC has been validated using a micro deep drawing case study in which both FEA simulations and experiments were conducted and compared. It has been proven in this study that the FLC obtained using the proposed µ-LDH test can be used for an extremely thin sheet-metal-forming process by the automotive, aerospace, medical, energy, and electronic industries, etc., right away for product design, forming process development, tool and die designs, and simulations, etc.
为了解厚度为38 µm的商用回火纯钛2级箔材（CP Ti Gr2）的可成形性，在室温下以准静态速度（0.01 mm/s）进行了一系列微限制圆顶高度（µ-LDH）测试，且未使用润滑剂。还采用了美国北伊利诺伊大学开发的一项技术在原始材料上制作微圆形网格（50 µm）。通过所提出的µ-LDH测试获得了CP Ti Gr2箔材的成形极限曲线（FLC）。为获取用于LS-Dyna有限元分析（FEA）模拟的CP Ti Gr2箔材的力学性能，还在室温下以相同速度在三个方向上进行了一系列拉伸试验。通过一个微深冲案例研究对所获得的FLC进行了验证，在该案例研究中进行了有限元分析模拟和实验并进行了比较。本研究已证明，使用所提出的µ-LDH测试获得的FLC可立即用于汽车、航空航天、医疗、能源和电子等行业的极薄板材成形工艺，用于产品设计、成形工艺开发、模具设计和模拟等。
