Is there any good textbook for introductory engineering fracture mechanics for undergraduate students?

Of the books that were already available by early 1990s, those by the following authors, I suppose, would be accessible to undergraduates. (In no particular order):

(i) T. L. Anderson
(ii) D. Broek
(iii) K. Hellan

I have no particular idea about the more recent books. But you may want to check out a recent recommendation by Gururajan at iMechanica for a book by K. Ramesh.

Hope this helps.

R.J. Sandford,"Principles of Fracture Mechanics", Prentice Hall,2002