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所在平台: Udemy |
课程主页: https://www.udemy.com/course/abaqus-learning-fracture-fatigue-theory-abaqus-implementation/
课程评论：没有评论
Coursera 课程总结：ABAQUS CAE：断裂与疲劳理论与实现 **课程概述：** 疲劳是机械结构失效最常见的原因。传统的实验方法耗时、成本高且受限于尺寸。本课程旨在通过精确的数值模型，实现对疲劳裂纹扩展的准确预测，特别强调使用ABAQUS软件结合扩展有限元方法（XFEM）和Paris定律进行高级模拟。课程将深入探讨直接循环载荷和低周疲劳方法，为分析循环载荷下材料的退化提供全面框架。 **学习目标：** 1. 掌握断裂力学和疲劳裂纹扩展的基础知识。 2. 理解有限元方法（FEM）和扩展有限元方法（XFEM）的原理，及其在裂纹扩展模拟中的应用，包括XFEM的丰富函数、水平集方法，以及如何在不重网格的情况下进行裂纹建模。 3. 了解疲劳裂纹传播的各个阶段，包括裂纹尺寸与循环数的关系、应力比效应，以及Paris定律、Walker定律和NASGRO等裂纹扩展定律。还将学习寿命预测、失效判据和安全裕度评估方法。 4. 学习在ABAQUS中进行模型创建，包括零件创建、材料定义（含牵引-分离损伤模型）、直接循环和低周疲劳步的实现（重点关注傅里叶表示和收敛准则），以及定义预裂纹和实现Paris定律的特殊交互属性。 5. 掌握结果解释与后处理，包括可视化裂纹扩展模式，以及生成和分析裂纹长度-循环数图和疲劳裂纹扩展速率（da/dN vs. ΔK）等关键输出。 6. 通过三个不同的案例研究，巩固所学知识。 **课程特色：** * 理论背景清晰，并结合ABAQUS的实践建模练习。 * 包含实际案例研究，涵盖复杂几何形状。 * 指导如何使用线弹性断裂力学（LEFM）原理设置脆性材料的模拟。 **适合人群：** 该课程适合希望深入理解有限元分析，并扩展在ABAQUS中进行断裂与疲劳分析知识的工程师、研究人员以及本科生或研究生。特别建议对裂纹扩展建模以及XFEM和直接循环分析等高级方法在实际工程中应用感兴趣的人士参与。 **课程结束时，学员将能够：** 在不同载荷条件下模拟、分析和解释疲劳裂纹扩展，从而在结构分析与设计领域获得竞争优势。
Fatigue represents the most common cause of mechanical structure failures. To investigate this phenomenon, studies have conducted experiments, conducting actual fatigue experiments demands extensive time, substantial financial resources, and is constrained by size limitations. The solution lies in the development and validation of precise numerical models. This is the primary driver behind our course, as it enables accurate and reliable predictions of crack growth. This course delves into the advanced simulation of fatigue crack growth using the eXtended Finite Element Method (XFEM) combined with the Paris Law formulation, fully implemented in ABAQUS software. The course emphasizes the direct cyclic and low cycle fatigue approaches, providing a comprehensive framework for analyzing the degradation of materials under cyclic loading.You Will Learn:1. Fundamentals of fracture mechanics and Fatigue Crack Growth:2. Finite Element Method (FEM) and eXtended Finite Element Method (XFEM) - Core principles of FEM and how they apply to crack propagation simulations. - Coverage of XFEM, including enrichment functions, and level-set methods. - How to model cracks without remeshing the mesh during propagation and how XFEM handles discontinuities.3. Fatigue Crack Propagation Regimes: - Understanding the relationship between crack size and cycles, including factors like stress ratio effects. - Detailed exploration of crack growth laws, including Paris Law, Walker Law, and NASGRO formulations. - Methods for life prediction, failure criteria, and assessing the factor of safety in fatigue analysis.4. Model Creation in ABAQUS: - Step-by-step guidance on part creation and material definition, including damage models for traction separation. - Implementation of direct cyclic and low cycle fatigue steps, focusing on Fourier representations, and convergence criteria. - Special interaction properties like pre-crack definitions and Paris Law implementation for fatigue analysis.5. Results Interpretation and Post-Processing: - Visualizing crack propagation patterns across different cycles. - Generating and analyzing key outputs such as crack length vs. cycle graphs and fatigue crack growth rates (da/dN vs. ΔK).6. Three different case studies.Course Features:- Detailed theoretical background paired with practical modeling exercises in ABAQUS.- Real-world case studies and examples, including complex geometries.- Guidance on setting up simulations for brittle materials using LEFM principles.Who Should Enroll:This course is designed for engineers, researchers, and under graduate or graduate students who wanted to get a very good understanding of finite element analysis and wish to expand their knowledge in the field of fracture and fatigue analysis using ABAQUS. It is particularly beneficial for those interested in crack growth modeling and the application of advanced methods like XFEM and direct cyclic analysis in practical engineering scenarios.By the end of the course, participants will be able to simulate, analyze, and interpret fatigue crack growth in various loading conditions, providing them with a competitive edge in the field of structural analysis and design.
