fracture mechanics

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hii all..

i am working on fracture mechanics. i had modeled a 4 pt bend specimen having single notch crack(in ABAQUS). i am trying to find the range of K-dominant region at the crack tip.i had modelled radial mesh at the crack tip and using 20 noded reduced integration elements. To analyze the K-dominat region, primarily i had compared the theoritical stress plots and computational stress plots. stress plots means Sxx Syy Sxy values plotted againt the angle(angle measured from uncracked segment) at particular radius.

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1. Introduction

2. Elements of linear elasticity

3. Stress intensity factors

4. Energy release rate

5. Fracture toughness

6. Applications of LEFM - Practical Issues 

7. Mixed mode and interface fracture

I wanted to get some insight in the transient stress intensity factor (SIF).

In the time history, we notice there is an overshoot (~27%)  from the

steady state SIF for a fixed (not propagating crack). I found the

overshoot occurs at the time when the reflected wave from the opposite

crack-tip comes back to the first crack tip. I wanted to know why this

overshoot occurs, what is the physical explanation?

Sandip Haldar 

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Add Problem 5: use the method of superposition to obtain the stress field around a hole in an infinite sheet under uniaxial remote stress.

Due date extended to Monday, January 28, 2008. 

Homework Problem 1: Self introduction in iMechanica (due January 21, 2008)

Homework Problems 2-5 (due January 28, 2008) 

Homework Problems 5-8 (due February 7, 2008) 

Homework Problems 9-18 (due March 3, 2008) 

Homework Problems 19-23 (due March 24, 2008) 

Homewrok Problems 24-28 (due April 9, 2008) 

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