有史以来第一个仿生3D打印水泥浆元素显示出使基础设施对机械负载更有弹性的前景，like those that occur during natural disasters.Image: Purdue University Concrete 3D Printing Team/Mohamadreza Moini
Purdue University researchers have 3D-printed cement paste,用于建造各种基础设施的混凝土和砂浆的关键成分，that gets tougher under pressure like the shells of arthropods such as lobsters and beetles.
The technique could eventually contribute to more resilient structures during natural disasters.
"大自然必须处理弱点才能生存，因此，我们利用水泥基材料的“内在”弱点来提高其韧性，"Jan Olek说，a professor in Purdue's Lyles School of 金宝博娱乐城Civil Engineering.
Control how damage spreads between printed layers of a material
The idea would be to use designs inspired by arthropod shells to control how damage spreads between the printed layers of a material,就像试图打破一堆生意大利面，而不是一个单一的面条。
"节肢动物的外骨骼有裂纹扩展和增韧机制，我们可以在3D打印水泥浆中复制。"says Pablo Zavattieri,Purdue professor of 金宝博娱乐城civil engineering.
3D-printed cement-based materials – such as cement paste,mortar and concrete – would give engineers more control over design and performance,but technicalities have stood in the way of scaling them up.
Purdue engineers first to use 3D printing to create bioinspired structures using cement paste
"3D打印已经不再需要为每种类型的设计创建模具，so that we can achieve these unique properties of cement-based materials that were not possible before,"says Jeffrey Youngblood,Purdue professor of materials engineering.
该小组还利用微型CT扫描来更好地了解硬化的3D打印水泥基材料的性能，并利用其薄弱的特性。such as pore regions found at the ‘interfaces' between the printed layers,which promote cracking.This finding was recently presented at the first RILEM International Conference on Concrete and Digital Fabrication.
"3D printing cement-based materials provides control over their structure,which can lead to the creation of more damage and flaw-tolerant structural elements like beams or columns,"says Mohamadreza ‘Reza' Moini,a Purdue PhD candidate of 金宝博娱乐城civil engineering.
团队最初的灵感来自螳螂虾，which conquers its prey with a ‘dactyl club' appendage that grows tougher on impact through twisting cracks that dissipate energy and prevent the club from falling apart.
Some of the bioinspired cement paste elements designed and fabricated by the team using 3D printing techniques include the ‘honeycomb',“合规”和“Bouligand”设计，called ‘architectures'.
Each of these architectures allowed for new behaviours in a 3D-printed element once hardened.布洛根建筑，例如，takes advantage of weak interfaces to make a material more crack-resistant,而顺从的体系结构使得水泥基元素像弹簧一样，even though they are made of brittle material.
The team plans to explore other ways that cement-based elements could be designed for building more resilient structures.
Watch a YouTube video://www.bjgzb.com/2018/10/16/new-3d-printed-cement-paste-gets-stronger-cracks-just-like-structures-nature///www.bjgzb.com/wp-content/uploads/2018/10/a-aaad.jpg//www.bjgzb.com/wp-content/uploads/2018/10/a-aaad-300x300.jpg技术3D打印，水泥，concrete