Computational Framework for Multiscale Mechanics of Connective Tissues

结缔组织多尺度力学计算框架

• 批准号: 8727295
• 负责人: JEFFREY A. WEISS
• 金额: $ 26.1万
• 依托单位: UNIVERSITY OF UTAH
• 依托单位国家: 美国
• 财政年份: 2012
• 资助国家: 美国
• 起止时间: 2012-09-30 至 2016-08-31
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/8727295
• 关键词: Affect; Algorithmic Software; Algorithms; Behavior; Biocompatible Materials; Biological; Biology; Biomechanics; Caliber; Cartilage; Cells; Cellular Mechanotransduction; Characteristics; Collagen; Collagen Fiber; Collagen Fibril; Collagen Type I; Companions; Complex; Computational Science; Computer Simulation; Computer software; Connective Tissue; Custom; Data; Data Set; Disease; Elements; Exhibits; Extracellular Matrix; Failure; Fiber; Fibroblasts; Gel; Geometry; Guidelines; Injury; Joint Capsule; Joints; Laboratories; Length; Ligaments; Measurement; Mechanics; Medicine; Methodology; Methods; Modeling; Motivation; Nanostructures; Osteocytes; Property; Research; Research Personnel; Scheme; Stress; Structure; Technology; Tendon structure; Tissues; Validation; Variant; Writing; base; bone; computer framework; computerized tools; fibrillogenesis; improved; infancy; innovation; insight; millimeter; model development; multi-scale modeling; nanometer; nanoscale; neglect; open source; physical model; simulation; software development; theories

DESCRIPTION (provided by applicant): Most connective tissues are composed primarily of collagen and exhibit hierarchical organization from the nanometer to the millimeter scale. Although the structure and mechanics of collagenous connective tissues have been studied for decades, a clear understanding of the relationships between hierarchical organization and material behavior is severely lacking. This can be attributed in large part to an inability to integrate and couple mechanics between the nanoscale, microscale and mesoscale. In theory, this integration can be accomplished using computational homogenization. The overall aim of this research is to enable multiscale mechanical modeling of hierarchical connective tissues, by developing a software framework and systematically investigating the influence of physical characteristics and assumptions on the predictions from the algorithms. As part of the research, we will develop finite element (FE) based algorithmic and software framework for analysis of nonlinear, multiscale models in biomechanics, based on the open-source FEBio software. To validate these approaches to multiscale modeling, we will construct idealized, multiscale physical surrogates with well-defined nano- and microstructure and perform simultaneous material characterization at the macro- and microscale. This information will be used to develop and validate parametric, multiscale FE models of the physical surrogates. The proposed research will create a significant impact by providing verified, publicly available computational tools, model development and validation methodologies for multiscale mechanics of hierarchical tissues. We anticipate that the results of this research and the software framework will be utilized across a broad range of applications in biology, medicine and beyond. Many heritable diseases directly affect collagen structure and fibrillogenesis, causing relatively well-characterized alterations in structure/organization of type I collagen at multiple levels. The proposed research is fundamentally necessary to enable multiscale mechanical modeling of connective tissues from the nanoscale to the mesoscale.

描述(申请人提供)：大多数结缔组织主要由胶原蛋白组成，并表现出从纳米到毫米尺度的分级组织。尽管胶原结缔组织的结构和机制已经被研究了几十年，但对层级组织和材料行为之间的关系仍然缺乏明确的理解。这在很大程度上可以归因于无法整合和耦合纳米尺度、微尺度和中尺度之间的力学。从理论上讲，这种积分可以使用计算均匀化来完成。这项研究的总体目标是通过开发一个软件框架并系统地研究物理特性和假设对算法预测的影响来实现分层结缔组织的多尺度力学建模。作为研究的一部分，我们将基于开源的FEBio软件，开发基于有限元(FE)的算法和软件框架，用于分析生物力学中的非线性、多尺度模型。为了验证这些多尺度建模方法，我们将构建具有定义良好的纳米和微观结构的理想化的多尺度物理代理，并在宏观和微观尺度上同时执行材料表征。这些信息将用于开发和验证物理替代物的参数、多尺度有限元模型。拟议的研究将通过为层级组织的多尺度力学提供经过验证的、公开可用的计算工具、模型开发和验证方法来产生重大影响。我们预计，这项研究的结果和软件框架将在生物学、医学和其他领域的广泛应用中得到应用。许多遗传性疾病直接影响胶原结构和纤维形成，导致I型胶原在多个水平上的结构/组织发生相对特征的变化。这项拟议的研究对于实现从纳米尺度到中尺度的结缔组织的多尺度力学建模是基本必要的。