EPSRC supported EngD project: Thermo-Mechanical Modelling for Structural Ceramics

EPSRC 支持的工程项目：结构陶瓷的热机械建模

• 批准号: 2351147
• 金额: --
• 依托单位: University of Birmingham
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2020
• 资助国家: 英国
• 起止时间: 2020 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2351147
• 关键词: EPSRC; supported; EngD; project; Thermo

Fatigue fracture is one of the failure modes in engineering ceramics where crack initiates, propagates, and finally results in failure under cyclic thermal loading. The efficient prediction of fatigue crack growth helps make engineering decisions on product durability. The conventional Paris law or J-integrals are not enough to predict crack growth in complex 3D geometries such as 3D perioidic structures from additive layer manufacturing. As an alternative method, the Phase Field models have been receiving increasing attention. In this approach it is possible to model both plastic and elastic deformations with a time in microcracked ceramics. The model predictions can also be used to track weaker zones in the structure and the severity of the applied loading conditions on the product durability. There is a knowledge gap in extending the Phase Fieldd models for elasto-plastic ceramics and measuring model input parameters such as fracture toughness, separation energy, cohesive strength, fatigue parameters for such complex structures such as honeycombs. In this work, Phase Field models will be developed to understand the durability of the microcracked systems and novel experimental techniques will be developed for measuring model parameters by utilizing facilities like high temperature bending test, Dynamic Mechanical Analyser, high-temperature impulse excitation, and nanoindentation. The model predictions will be validated on model materials under thermal shock load conditions. Similarly, these models will be used to explain the revesible grain growth and hysteresis in the elastic properties of microcracked ceramics.This project will specifically address some of the product development and quality control needs of JM. The EngD student will work as an integral part of thermal processing group and quality control teams. JM is building an enhanced capability in this area, enabling the model driven manufacturing & design. The EngD researcher will play a key role within this team; developing bespoke measurement methods, fracture model for a given product formulations. The focus of the EngD will be the fundamental R&D needs of the group, but also being involved in trials and implementation of models in commercial environment and support different manufacturing sites in Europe. For any concern with Brexit, this position is fully paid and sponsored.

疲劳性断裂是工程陶瓷的故障模式之一，在该模式下，裂纹引发，繁殖并最终导致循环热负载下的故障。疲劳裂纹增长的有效预测有助于对产品耐用性做出工程决策。常规的巴黎法律或J构成不足以预测复杂的3D几何形状（例如来自加性层制造的3D周期结构）的裂纹生长。作为另一种方法，相位场模型一直在受到越来越多的关注。在这种方法中，可以在微裂片的陶瓷中使用塑性变形和弹性变形进行建模。该模型预测还可以用于跟踪产品耐用性的结构和所施加的加载条件的严重性较弱的区域。在扩展弹性塑料陶瓷的相位场模型和测量模型输入参数（例如断裂韧性，分离能，粘性强度，疲劳参数（例如蜂窝）等复杂结构（例如蜂窝）的疲劳参数）中，有一个知识差距。在这项工作中，将开发相位场模型以了解微裂纹系统的耐用性，并通过利用高温弯曲测试，动态机械分析仪，高温脉冲激发和纳米识别的设施来开发用于测量模型参数的新型实验技术。模型预测将在热冲击负荷条件下在模型材料上进行验证。同样，这些模型将用于解释微裂纹陶瓷的弹性特性中可恢复的谷物生长和滞后。此项目将专门解决JM的一些产品开发和质量控制需求。 ENGD学生将成为热处理小组和质量控制团队不可或缺的一部分。 JM正在该领域建立增强的功能，从而实现了模型驱动的制造和设计。 Engd研究人员将在该团队中发挥关键作用。开发定制测量方法，给定产品制剂的断裂模型。 ENGD的重点将是该集团的基本研发需求，但也参与了商业环境中模型的试验和实施，并支持欧洲的不同制造地点。对于英国脱欧的任何担忧，该职位是完全付款和赞助的。