# Elementary Engineering Fracture Mechanics by David Broek

I think this book is a good complement to the course Fracture Mechanics ES 247. There are several reasons:

1. This book is written from an engineering point of view, which is different from our class. In the first chapter Introduction, the book gives some engineering cases of fracture and fatigue. In chapter 3, the stress field is given for the different cracks with engineering importance. This book has two parts. one is Principle, and the other is Application, with a lot of engineering practical problems. Although I haven't read the second part, I think it will well complement our course.

2. This book has a fantastic chapter, chapter 2 Mechanisms of fracture and crack growth. Fracture mechanics is a thoery to quantitatively analyze the fracture based on the continuum mechanics, but we still don't quite understand the physics of fracture. This chapter introduces the mechanism of the cleavage and ductile fracture based on the material science and shows a lot of micrographic pictures of fracture and fatigue.

3. Chapter 3 is about the elastic crack-tip stress field. Complex variable method is used to solve the stress field. Some results for the cracks with engineering importance are listed as a table, which is convenient to look up.

However, there are also some possible weakness of this book:

1. Like a lot of other books, it doesn't make it very clear what is stress intensity factor. Several years ago, I learned fracture mechanics by myself and read some books, which included the Chinese version of this book. Most books just tell you this is the stress field of this crack with a parameter called stress intensity factor. I never fully understood this important concept, stress intensity factor, without the derivation of the eigenvalue problem. Fortunately, in the class, the derivation of this part is so clear and I finally understand stress intensity factor.

2. The energy principle is the main idea of fracture mechanics. However, this part is organized as chapter 5 in this book, but with chapter 3 talking about detailed stress field and chapter 4 plastic zone. I wonder whether putting energy principle earlier may make the book  easier to understand.