EAPSI: Modeling Mechanical Damage Response in Protein-Bound Soils

EAPSI：模拟蛋白质结合土壤中的机械损伤响应

• 批准号: 1614201
• 负责人: Isamar Rosa
• 金额: $ 0.54万
• 依托单位: Rosa Isamar
• 依托单位国家: 美国
• 项目类别: Fellowship Award
• 财政年份: 2016
• 资助国家: 美国
• 起止时间: 2016-06-15 至 2017-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1614201&HistoricalAwards=false
• 关键词: EAPSI; Modeling; Mechanical; Damage; Response

Extraterrestrial construction presents many interesting and new challenges. Unlike Earth, on the moon, Mars and asteroids there are very limited resources, other than soil, out of which the shelters, roads and landing pads needed for exploration can be built. As a possible candidate, a new material composed primarily of soil held together by a solution of water and proteins called Protein-bound Soils was recently developed. This material has strength similar to unreinforced concrete. However, the material?s behavior after it has been damaged has yet to be explored. This information is critical to designing a durable material that can resist extreme environments. In this project, a collaboration between damage modeling experts at Hokkaido University in Japan and protein-bound soil experts at Stanford University hopes to explore for the first time the material's damage states and computationally model its response. To date, experimental tests of mechanical properties have shown significant variability among Protein-bound Soil samples. This variability drives the creation of computational micromechanical models to gain a better understanding of the underlying mechanics that provide strength. Currently the focus is on the micromechanical properties, with emphasis on modeling periodic unit cells that capture the interactions between the particles and the protein bridges that bind them. Moving forward, mesoscale modeling is needed to understand how the material responds to damage and how its performance is affected by fatigue and environmental attacks. To achieve this, the PI and Prof. Tamon Ueda of Hokkaido University, an expert in mesoscale damage in concrete, will explore how current mesoscale damage modeling can be applied to Protein-Bound Soils. This project would represent the first venture into mesoscale modeling of this new material and promises a framework to computationally model damage in similar earthen materials.This award under the East Asia and Pacific Summer Institutes program supports summer research by a U.S. graduate student and is jointly funded by NSF and the Japan Society for the Promotion of Science.

外星建筑提出了许多有趣的新挑战。与地球不同，在月球、火星和小行星上，除了土壤之外，资源非常有限，可以用来建造探索所需的避难所、道路和着陆场。作为一种可能的候选材料，最近开发了一种主要由土壤组成的新材料，该土壤由水和蛋白质溶液结合在一起，称为蛋白质结合土壤。这种材料的强度类似于未加固的混凝土。然而，材料？的行为后，它已被损坏还有待探讨。这些信息对于设计能够抵抗极端环境的耐用材料至关重要。在这个项目中，日本北海道大学的损伤建模专家和斯坦福大学的蛋白质结合土壤专家之间的合作，希望首次探索材料的损伤状态，并对其响应进行计算建模。到目前为止，机械性能的实验测试已经显示出显着的变化之间的蛋白质结合土壤样品。这种可变性推动了计算微力学模型的创建，以更好地理解提供强度的基础力学。目前的重点是微观力学性能，重点是建模周期性的单位细胞，捕捉粒子和蛋白质之间的相互作用，绑定它们的桥梁。展望未来，需要进行中尺度建模，以了解材料如何对损坏做出反应，以及疲劳和环境攻击如何影响其性能。为了实现这一目标，PI和北海道大学的Tamon上田教授，混凝土中的细观损伤专家，将探讨如何将当前的细观损伤模型应用于蛋白质结合土壤。该项目将代表对这种新材料进行中尺度建模的第一次冒险，并有望为类似土材料的破坏提供计算模型框架。东亚和太平洋夏季研究所计划下的该奖项支持美国研究生的夏季研究，由NSF和日本科学促进会共同资助。