Oxide-Oxide Ceramic Matrix Composite simulation of continuum damage and fatigue failure response

项目描述该计划将表面上分为两个部分：1。研究并选择ox/ox CMC的非线性分析方法基于CEMTEC和OMC下为SiC/SiC CMC开发的方法重点关注2D双向织物增强复合材料，但意识到交叉铺层ATL复合材料正在开发中。应包括织物属性分布;应定义测试的本构属性输入，可能作为较大R-R程序的一部分。调查/调整Mori-Tanaka材料均质化介观尺度模型，用于三相系统（纤维，基质，孔隙度），以解释Ox/Ox CMC损伤力学，例如处理微观和宏观孔隙度（通过元素引入明确建模宏观孔隙度）。开发将中尺度输入引入大尺度工程模型的方法，通过子体积均匀化方法进行特征评估。预计不需要高保真的宏观尺度模型。探索UoB CZM公式应用于ox/ox CMC的静态（单调）加载-全厚度压缩增强，非局部CZM，动态插入内聚段，探索CDM涂抹裂纹模型和“定向”涂抹裂纹模型。2.根据ox/ox CMC特性制定适当的疲劳建模方法审查/评价ONERA发表的疲劳建模工作。与包括定向CDM和下选在内的弥散裂纹连续损伤模型进行比较。与以前的UoB疲劳建模方法进行比较、对比和下选：o显式疲劳CZM、非局部疲劳CZM公式、带4-IP单元的疲劳CZM、双包络法、完全反向疲劳加载（通常代表真实的部件气动表面载荷）、用于分层扩展的CZM、包含复杂振动载荷的广谱疲劳。疲劳方法应建立在第一次练习中开发的框架上。CMC将由N610 1500旦尼尔8HS织物或4500旦尼尔5 HS织物制造，具有铝硅酸盐基质和相似的组成体积分数。如果需要，可以选择多种材料来源。第1年选择并开发最适合单调载荷的非线性分析方法第2年审查疲劳建模的CDM和CZM选项，确定每个选项的必要性，并开发选择的选项第3年将静态和疲劳方法作为工作流程/工具结合起来，以帮助设计师进行结构完整性评估第4年用户手册，工具，GUI，论文

Project DescriptionThe programme will be ostensibly split into two parts:1. Investigate and downselect a method for non-linear analysis of ox/ox CMCsBuild on methods developed for SiC/SiC CMCs under CEMTEC and OMCs Focus on 2D bi-directional fabric reinforced composites, but with awareness that cross-ply ATL composites are in development. Fabric property distribution should be included; constitutive property inputs should be defined for testing, possibly as part of larger R-R programme.Investigate/adapt the Mori-Tanaka material homogenisation meso-scale model, for three phase system (fibre, matrix, porosity), to account for Ox/Ox CMC damage mechanics, such as handling micro and macro porosity (by element introduction to model macroporosity explicitly). Develop method for introduction of meso-scale input into macroscale engineering model for feature assessment via a sub-volume homogenisation approach. High fidelity macro-scale models are not expected to be needed.Explore UoB CZM formulations for application to ox/ox CMCs for static (monotonic) loading - through-thickness compression enhancement, non-local CZM, On-the-fly Insertion of Cohesive Segments,Explore CDM smeared crack models and 'directed' smeared crack models.2. Develop appropriate fatigue modelling approach based on ox/ox CMC characteristicsReview/appraise published fatigue modelling work by ONERA. Compare to smeared crack Continuum Damage Models including directed CDM and downselect.Compare, contrast and downselect from previous UoB approaches to fatigue modelling:o Explicit fatigue CZM, non-local fatigue CZM formulation, fatigue CZM with 4-IP elements, double envelope method, fully-reversed fatigue loading (often representative of real component aero surface loading), CZM for delamination growth, broad spectrum fatigue encompassing complex vibrational loadingThe fatigue approach should be built upon the framework developed in the first activityObjectivesTwo material revisions will be explored; CMCs will be manufactured from N610 1500 denier 8HS fabric or 4500 denier 5HS fabric, with an aluminosilicate matrix and similar constitutive volume fractions. Multiple materials sources may be possible if required.Year 1Downselection and development of most appropriate non-linear analysis method(s) for monotonic loadingYear 2Review CDM and CZM options for fatigue modelling, determine necessity for each, and develop downselected option(s)Year 3Bring together static and fatigue methods as workflow/tool to aid designer in structural integrity assessmentYear 4User manual, tool, GUI, thesis