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arXiv 2105.10000physics.app-phcond-mat.mtrl-sci
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3D打印五金刚石(Pentadiamond)的力学性能

Mechanical Properties of 3D-Printed Pentadiamond

Levi C. Felix, Rushikesh S. Ambekar, Cristiano F. Woellner, Brijesh Kushwaha, Varinder Pal, Douglas S. Galvao, Chandra S. Tiwary

AI总结:

本研究结合模拟与实验探究3D打印五金刚石的力学性能,发现其应力-应变行为具三阶段特征、变形以弯曲为主,能量吸收性能优异,在能量吸收领域有应用潜力。

摘要:

本研究将全原子分子动力学、有限元模拟与力学测试相结合,探究了五金刚石(pentadiamond)的原子模型与3D打印模型的力学行为。五金刚石是近期提出的新型碳同素异形体,由五边形环构成的共价网络组成。研究结果表明,其应力-应变行为几乎与尺度无关。3D打印结构的应力-应变曲线呈现三个特征区域:低应变下的第一区域呈现接近零的非线性行为,随后是明确的线性行为;第二阶段为准塑性阶段;第三阶段为致密化阶段,随后发生结构破坏(断裂)。杨氏模量值随孔隙数量增加而降低。其变形机制以弯曲为主,不同于其他3D打印结构中观察到的逐层变形机制。这类结构展现出优异的能量吸收能力,部分结构的性能甚至优于kevlar(凯夫拉)。值得注意的是,在Ashby图中,3D打印五金刚石几乎位于理想拉伸主导与弯曲主导线之上,使其成为极具潜力的能量吸收应用材料。

英文摘要:

In this work, We combined fully atomistic molecular dynamics and finite elements simulations with mechanical testings to investigate the mechanical behavior of atomic and 3D-printed models of pentadiamond. Pentadiamond is a recently proposed new carbon allotrope, which is composed of a covalent network of pentagonal rings. Our results showed that the stress-strain behavior is almost scale-independent. The stress-strain curves of the 3D-printed structures exhibit three characteristic regions. For low-strain values, this first region presents a non-linear behavior close to zero, followed by a well-defined linear behavior. The second regime is a quasi-plastic one and the third one is densification followed by structural failures (fracture). The Young's modulus values decrease with the number of pores. The deformation mechanism is bending-dominated and different from the layer-by-layer deformation mechanism observed for other 3D-printed structures. They exhibit good energy absorption capabilities, with some structures even outperforming kevlar. Interestingly, considering the Ashby chart, 3D-printed pentadiamond lies almost on the ideal stretch and bending-dominated lines, making them promising materials for energy absorption applications.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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