Bi-Material Negative Thermal Expansion Inverted Trapezoid Lattice based on A Composite Rod

Materials

Weipeng Luo¹  Cun Zhao¹  Meng Zhang¹  Guoxi Li¹  Shuai Xue¹ 

[1] College of Intelligent Science, National University of Defense Technology, Changsha 410073, Hunan, China;

关键词: negative thermal expansion;    bi-material;    composite lattice;    thermal;    inverted trapezoid lattice;   

DOI  :  10.3390/ma12203379

来源: DOAJ

【 摘 要 】

Negative thermal expansion (NTE) lattices are widely used in aerospace engineering where the structures experience large temperature variation. However, the available range of NTE of the current lattices is quite narrow, which severely limits their engineering application. In this paper, we report an inverted trapezoid lattice (ITL) with large NTE. The NTE of the ITL is 2.6 times that of a typical triangular lattice with the same height and hypotenuse angle. Theoretically, with a pin-jointed assumption, the ITL can improve the NTE by order of magnitude if the length ratio of the composite rod is changed. In the presented ITL, a composite rod is utilized as the base of the ITL. The composite rod has large inner NTE. The inverted trapezoid structure converts the inner NTE to the vertical direction contraction and obtains an extra NTE. Finite element simulations and experimental verification by interferometric measurement were conducted to verify the large thermal expansion of the ITL.

【 授权许可】

Unknown