An Integrated Computational-Experimental Approach to Three-dimensional Fracture in Polymer-Ceramic Composites

聚合物陶瓷复合材料三维断裂的综合计算实验方法

基本信息

批准号：
1826221
负责人：
Jing Du
金额：
$ 54.54万
依托单位：
Pennsylvania State Univ University Park
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2018
资助国家：
美国
起止时间：
2018-10-01 至 2024-09-30
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1826221&HistoricalAwards=false
关键词：
Integrated Computational Experimental Approach Three

项目摘要

Composite materials are used in spacecrafts, aircrafts, automobiles, and naval vessels for their unique property to provide high strength- and stiffness-to-weight ratios. They are also used in bioengineering and electronic devices; and concrete is a composite that is one of the most widely used materials today. Understanding their behavior is important to advance the design of these materials, as measures taken to further strengthen or stiffen them can sometimes yield counterintuitive or even counterproductive results. This award supports fundamental research on understanding the material properties of composites by examining the three-dimensional mechanics and failure evolution on the microstructural level. An integrated combination of experiments and simulations will be used to study their behavior, with a focus on polymer-ceramic composites. This project will answer fundamental questions about the competing mechanisms on the microscale that lead to the counterintuitive relations between microstructure and resulting composite properties. The new knowledge and tools will lead to advances in the design of composites, and significantly impact the broad range of applications in which these materials are used, thereby impacting national health, prosperity, and welfare; and securing the national defense. The outreach and educational activities in this project will broaden the participation of undergraduate and graduate students, particularly women and from other underrepresented groups, in STEM subjects through research in the PIs' labs. The outreach activities with visiting students from Africa also intends to inspire interest of African-American students in STEM subjects.A new computational approach called the continua-discontinua particle method (CDPM) is proposed which combines the strengths of traditional continuum-based methods in fundamental mechanics and mathematically grounded principles, with the strengths of discrete methods in simulating arbitrary complex three-dimensional fracture. The method allows the transition under failure from a meshfree particle discretization based on continuum mechanics, to that of a discrete fracture network similar to discrete particle methods. An approach using micro X-ray computed tomography (micro-CT) and an in-situ mechanical tester is proposed, which yields 3D full-field mechanical measurements. Other material characterization methods, such as tensile testing, nanoindentation, and scanning electron microscopy will also be employed to compliment the in-situ experiments. The experiments and simulations will be closely integrated to both formulate and validate the numerical models for prediction of composite stiffness, strength, and toughness of polymer-ceramic composites with varying filler morphology, as well as illuminate the underlying causes of the structure-property relationships in these materials.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

复合材料因其独特的性能而被用于航天器、飞机、汽车和海军舰艇，以提供高强度和刚度重量比。它们还用于生物工程和电子设备；混凝土是一种复合材料，是当今使用最广泛的材料之一。了解它们的行为对于推进这些材料的设计非常重要，因为进一步强化或硬化它们的措施有时会产生违反直觉甚至适得其反的结果。该奖项支持通过检查微观结构层面的三维力学和失效演化来了解复合材料材料特性的基础研究。将采用实验和模拟的综合组合来研究它们的行为，重点是聚合物陶瓷复合材料。该项目将回答有关微观尺度上竞争机制的基本问题，这些机制导致微观结构与所得复合材料性能之间的反直觉关系。新知识和工具将推动复合材料设计的进步，并对这些材料的广泛应用产生重大影响，从而影响国民健康、繁荣和福利；并确保国防。该项目的外展和教育活动将通过 PI 实验室的研究，扩大本科生和研究生，特别是女性和其他代表性不足群体对 STEM 科目的参与。与来自非洲的访问学生进行的推广活动也旨在激发非裔美国学生对 STEM 学科的兴趣。提出了一种称为连续体-不连续体粒子法（CDPM）的新计算方法，该方法在基本原理上结合了传统基于连续体的方法的优点。力学和数学基础原理，具有离散方法在模拟任意复杂三维断裂方面的优势。该方法允许在失效情况下从基于连续介质力学的无网格颗粒离散过渡到类似于离散颗粒方法的离散断裂网络。提出了一种使用微型 X 射线计算机断层扫描 (micro-CT) 和原位机械测试仪的方法，可产生 3D 全场机械测量。其他材料表征方法，如拉伸测试、纳米压痕和扫描电子显微镜也将用于补充原位实验。实验和模拟将紧密结合起来，制定和验证数值模型，用于预测具有不同填料形态的聚合物陶瓷复合材料的复合材料刚度、强度和韧性，并阐明结构与性能关系的根本原因。该奖项反映了 NSF 的法定使命，并通过使用基金会的智力价值和更广泛的影响审查标准进行评估，被认为值得支持。