Additively manufactured mechanical meta-materials: design and applications to aeroengine structures

Purpose Mechanical meta-materials have aroused great interest during the past few decades. Unique or even unprecedented mechanical behaviors and functionalities have been created through the rational design of the micro-structure of mechanical meta-materials. Moreover, the development of additive manufacturing (AM) techniques further promotes their applications in various fields like aerospace, automobile, tissue engineering, etc. In recent years, mechanical meta-materials have also been applied to the design of aeroengine structures due to their superior performance and lightweight features. This paper aims to give a comprehensive review of the design of mechanical meta-materials and show their recent applications to aeroengine structures. Design/methodology/approach This paper presents a state-of-the-art review on the design of mechanical meta-materials and their applications to the rotating and stationary components in aeroengine structures. Findings Mechanical meta-materials are categorized into two kinds, including homogeneously architected meta-materials that have one unique unit cell periodically arranged to fill the space and heterogeneously architected meta-materials that may integrate different unit cell designs or introduce gradient changes to the whole structure. A promising design strategy, i.e. “the right micro-structure deployed to the right position,” is proposed for heterogeneous meta-materials, and it is concluded that the design methods for mechanical meta-materials are moving from simple cell design to the direction of customized and optimized design enabled by artificial intelligence. Besides, the integration of metal AM and mechanical meta-materials paved a novel path for the design of lightweight high-performance engine structures. Originality/value The present paper systematically reviews the design of mechanical meta-materials, and for the first time summarizes the application of mechanical meta-materials to aeroengine structures.