2010129 断裂力学(中英文)(2011) -

天津大学《断裂力学》课程教学大纲

课程编号： 学 时： 学时分配： 授课学院： 适用专业： 先修课程：

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机械工程学院 工程力学

材料力学、弹性力学、塑性力学

课程名称： 断裂力学 学 分： 2

授课： 32 上机： 实验： 实践： 实践（周）：

一、课程的性质与目的

本课程属选修课，面向固体力学专业高年级本科生及相关专业研究生，讲述断裂力学的基本概念和方法。学生应具备“材料力学”、“弹性力学”和“塑性力学”等课程的基础知识。 二、教学基本要求

通过该课程，使学生对断裂力学的发展状况和应用领域有一定的了解，掌握断裂力学的基本概念、方法和原理。使学生具备一定的工程结构和材料失效分析的能力，并掌握用断裂力学方法进行工程结构的合理选材、安全评定与抗失效设计。

三、教学内容

1、绪论: 断裂力学的起源和发展；断裂力学、材料力学、弹性和塑性力学之间的关系；断裂力学的任务、方向和国内外现状。

2、线弹性断裂力学: 基本方程和基本断裂模式、裂纹尖端场与应力强度因子、能量释放率、应力强度因子的计算方法、复合型裂纹扩展准则、界面裂纹、断裂动力学概要。

3、疲劳和腐蚀裂纹: 等幅载荷下裂纹扩展、影响疲劳裂纹扩展的因素、裂纹闭合效应、疲劳裂纹扩展门槛值及寿命预测、腐蚀介质中裂纹扩展概述、应力腐蚀裂纹扩展及腐蚀条件下结构的安全设计。

4、弹塑性断裂力学: 小范围屈服理论、Dugdale-Barenblatt条带塑性区模型、裂尖张开位移和COD准则、J积分及J积分准则、弹塑性裂纹尖端场（HRR）。 5、断裂测试: ASTM标准测试、层间断裂韧度测试、压痕法、Chevron 切口法。 6、损伤力学简介: 损伤的基本概念和模型及其与断裂力学关系。

7、其它相关内容简介：工程应用、结构安全评定方法。 四、学时分配

教学内容 绪论 线弹性断裂力学 疲劳和腐蚀裂纹 弹塑性断裂力学 断裂测试 损伤力学简介 其它相关内容简介 总计： 五、评价与考核方式

期末考试（60%）、平时作业和课程总结书面报告（各20%）

授课 2 12 4 6 4 2 2 32 上机 实验 实践 实践(周) 六、教材与主要参考资料

参考教材：陆毅中主编，《断裂力学》，西安交通大学出版社，1999年 沈成康编著，《断裂力学》，同济大学出版社，1996年 黄克智，余寿文编著，《弹塑性断裂力学》

杨卫著，《宏微观断裂力学》，国防工业出版社，1995年

TU Syllabus for Fracture Mechanics

Code:

Semester Hours: Semester Structure Offered by: for: Prerequisite:

1. Objective

This course is an elective, for junior undergraduates of Solid Mechanics and graduates of relevant disciplines, about the basic concepts and methods of Fracture Mechanics. Students should have a basic knowledge of the courses such as Mechanics of Materials, Elasticity and Plasticity. 2. Course Description

Through the course, students have a certain understanding of development and applications of Fracture Mechanics, grasping basic concepts, methods and principles of Fracture Mechanics. By the end of the course, students should have some degree of ability to analyze the failure events in engineering structures and materials with the know-how on material selection, safety evaluation and anti-failure design in engineering. 3. Topics a.

Introduction: the origins and development of Fracture Mechanics; relationship with Mechanics of Materials, Elasticity and Plasticity. The task, new directions and the cutting-edge knowledge of Fracture Mechanics. b.

Linear elastic fracture Mechanics: basic equations and fracture modes; Asymptotic crack tip fields and stress intensity factors(SIFs); Energetic consideration and energy release rate; Methods for calculation of stress intensity factors; Criteria for mix-mode fracture; Interface crack problems; Brief introduction of dynamic fracture c.

Fatigue and stress corrosion crack propagation: Fatigue and crack propagation;

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Title: Credits:

Fracture Mechanics 2

Hour Lecture：32 Computer Lab： Experiment： Practice：

Practice (Week)：

School of Mechanical Engineering Engineering Mechanics

Mechanics of materials, elasticity and plasticity

Key factors and thresholds for fatigue crack propagation; Crack closure effect; Life estimation of structures; Overview of the stress corrosion crack propagation; SCC propagation laws and safety evaluation in corrosive media. d.

Elastoplastic fracture Mechanics: Small scale yielding model; Dugdale-Barenblatt strip model; COD and COD criterion; J integral and J integral criterion; Elastoplastic crack tip fields. e.

Fracture tests: ASTM standard fracture test; Interlaminar fracture toughness test; Indentation method; Chevron notch method. f. g.

Damage mechanics: Basic concepts, models and relation to facture.

Introduction to other related content: Application of fracture mechanics in safety evaluation in engineering structures. 4. Semester Hour Structure

Topics Lecture 2 12 Computer Lab. Experiment Practice Practice (Week) Introduction Linear elastic fracture mechanics Fatigue and stress corrosion crack propagation Elastoplastic fracture mechanics Fracture tests Damage mechanics Introduction to other related content Sum: 4 6 4 2 2 32 0 5. Grading

Term test (60%); Final report and homework (40%) 6. Text-Book & Additional Readings References

Lu YZ, Fracture mechanics, Xi’an Jiaotong University press, 1999

Shen CK, Fracture Mechanics, Tongji University press, 1996

Hwang KC and Yu SW, Elastoplastic fracture, Tsinghua University Press, 1987

Yang W, Macro- and Micro-scopic fracture mechanics, National defense industry

press, 1995.

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