In-plane Compressive Mechanical Behavior of SLM Titanium Alloy Honeycomb Structure

doi:10.12382/bgxb.2022.0585

Abstract

Abstract:

In order to explore the potential application of additively manufactured metal honeycomb structures in the field of protection, titanium alloy honeycomb samples were prepared by selective laser melting (SLM), and uniaxial in-plane compressive mechanical experiments were carried out. Periodic crushing and unloading phenomena appeared in the platform section, which was different from the features of the platform section of traditional plastic/brittle materials honeycomb. Using the digital camera and scanning electron microscope, the structural deformation modes and fracture failure mechanism were analyzed. Based on the parametric finite element analysis, the influence of wall thickness on the crushing and unloading of honeycomb structures was studied. The results showed that: the titanium alloy honeycomb samples prepared by SLM had high printing accuracy and small difference in mechanical properties; when the titanium alloy honeycomb structure was compressed in the plane, the fracture of the honeycomb edge connection in the structural shear zone results in the periodic crushing and unloading in the stress-strain curve of the structure; obvious dimples could be observed on the fracture surface at the failure site, showing an obvious plastic failure morphology; the wall thickness thinning can effectively increase the rotation angle of the short side of the honeycomb during failure and reduce the minimum bending radius, thus significantly improving the crushing and unloading phenomena and enhancing the bearing stability of the structure.

Key words: honeycomb, titanium alloy, selective laser melting, in-plane compression, finite element modeling

QIAO Yang, ZHAO Zhicheng, XIE Jing, CHEN Pengwan. In-plane Compressive Mechanical Behavior of SLM Titanium Alloy Honeycomb Structure[J]. Acta Armamentarii, 2023, 44(3): 629-637.

Figures/Tables 14

Fig. 1 Principle diagram of SLM technique

Table 1 Element mass fraction %

Al	V	C	Fe	O	N	H
5.5~6.75	3.5-4.5	0.08	0.3	0.2	0.05	0.015

Table 2 Honeycomb specimen size

高/mm	宽/mm	厚/mm	横截面积/mm²
50±0.06	44.7±0.04	9.5±0.08	424.65±4

Fig. 2 Honeycomb specimen

Table 3 Titanium alloy material model parameters[21]

参数	数值	参数	数值
杨氏模量E/GPa	109.778	D₁	-0.09
泊松比μ	0.31	D₂	0.27
密度ρ/(kg·m^-3)	4 428	D₃	0.48
A/MPa	862	D₄	0.014
B/MPa	331	D₅	3.87
n	0.34	T_r/K	293
$\dot{\varepsilon}_0$/s^-1	1	T_m/K	1 189
C	0.012
m	0.8

Fig. 3 SEM image of the titanium alloy honeycomb

Fig. 4 Comparison of the quasi-static in-plane compression of SLM titanium alloy honeycomb in the experiment and simulation

Fig. 5 Experimental stress-strain curves of quasi-static in-plane compression of SLM titanium alloy honeycomb

Fig. 6 Microstructural characterization of long edge elements

Fig. 7 Microstructural characterization of short edge elements

Fig. 8 Schematic diagram of the honeycomb cell’s deformation process

Fig. 9 Equivalent peak force-strain curves

Fig. 10 CLE comparison under different wall thicknesses

Fig. 11 Comparison of energy absorption efficiencies under different wall thicknesses

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