# fracture mechanics

## Automatic failed element removal

Hi every one,

I think that there is a method for automatic failed element removal  using UMAT subroutine, I mean that at every iteriation failed elements with the help of a failure criterion to be indicated and to its material behaviour to set to zero and this means that a path for crack propagation will form .... Anyway, if any body is intrested we can clarify this subroutine step by step for all of the visitors in this website, I mean that an open source subroutine to be expanded here.

Thank you,

## Crack Propagation in Contact Fatigue

are there any codes available for the crack propagation under fatigue loading? taking into consideration the contact between the crack faces.

## EM 388F Lecture Notes 9: Nonlinear Fracture Mechanics II

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## EM 388F Lecture Notes 8: Nonlinear Fracture Mechanics I

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## Gradient based cohesive zone models

Hello,

Strain gradient based (non-local) plasticity and damage models have been studied quite extensively in the literature.

I was wondering if anyone has experience in the development of cohesive zone models that obtain the tractions in front of crack tip not only as a function of the diplacement jump, but also as a function of the gradient of displacement jump.

If yes, can you please point me to the reference?

## EM 388F Lecture Notes: Mixed Mode and Interfacial Fracture

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## EM 388F Homework Problems 29-30

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## EM 388F Homework Problems 24-28

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## EM388F Term Paper: Finite Element MEthod in Fracture Mechanics

Early applications of the finite element method to crack problem was
developed by Swedlow and et al. Even though they could get reasonable
accuracy about 5 to 10%, later study showed that solutions in the
vicinity of the crack tip cannot be guranteed to be accurate regardless
of the mesh density around tip. In order to overcome this problem,
people developed special crack tip elements.

In this term paper, I'm going to present 1) Finite Element Method in
Fracture Mechanics and 2) NewFinite Element technique so called Extended Element Method.

## EM 388F Term Paper: Application of Fracture Mechanics on Cortical Bone Studies

One of the most common problems in older people is the fragility of the bones. Human bones are prone to fracture, and fracture of certain bones in the body such as the cortical bone may be fatal. Understanding of the fracture mechanism of bones is essential for the medical profession, and plays a major role in the study of osteoporosis as well.