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# stress intensity factor

## Stress intensity factor

Wed, 2016-09-28 00:40 - Surendran MHi I have long been looking for a clear way of defining stress intensity factors. Apart from the usual bookinsh definitions such as "strength of singularity" "state of stress". Of course I could convince myself by relating SIF with Strain Energy Release Rate (G) as 'G' has a more convincing physical meaning explained through the creating of new surfaces. This kind of gives the feeling that 'K' is a derived quantity in the field of fracture mechanics.

So is there a better way of explaining SIF without having to go through 'G'.

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## ABAQUS - Stress Intensity Factor for Single Radial Crack in Thick Walled Cylinder

Wed, 2016-08-03 04:25 - IanLauHi,

I am trying to analyze the stress intensity factor (SIF) using contour integral of a 2D thick walled cylinder under plane stress with different wall ratios under internal pressure loading only and a single radial crack of varying length in Abaqus.

The wall ratio (inner & outer radius) I am interested in modelling is of ratio 6 (i.e. for inner radius of 1, outer radius is 6).

I have modelled ratios from 1-6 with crack length varying from 0.1-0.9 of the wall thickness. (i.e. for ratio 3, the wall thickness is 2, hence the crack varies from 0.1-0.9 x 2).

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## How to calculate Stress intensity factor through FE programming?

Wed, 2016-01-27 08:25 - mmalekanDear all,

I need to calculate SIF through a FEM program by writing some line of codes. The problem is that I wasn't able to find a reference contains straightforward formulation and procedure for this. Can anybody help me please with this issue?

Cordially,

Mohammad

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## Applicable limit of the stress intensity factor for steep yield strength distribution

Mon, 2013-10-21 11:44 - W. Brocks- Read more about Applicable limit of the stress intensity factor for steep yield strength distribution
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## Discussion of fracture paper #6 - Stress intensity factor for steep yield distribution

Sun, 2013-10-20 18:00 - ESIST. Yasuoka, Y. Mizutani, A. Todoroki: Applicable limit of the stress intensity factor for steep yield strength distribution, Engineering Fracture Mechanics, 2013, Vol. 110, pp. 1-11.

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## What is the crack-tip stress intensity factor of an embedded crack under mode II shear?

Wed, 2013-08-21 03:51 - Rui Tao QuHi,

From textbook of fracture mechanics, we know that for an embedded crack subjected to mode I stress state, KI=(2/π)σ√πa, while 2a is the crack size.

But for a embedded crack subjected to a pure shear stress τ, what is the stress intensity factor at the crack-tip?

Thank you

Ruitao

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## prediction of crack path which is subjected to stress gradient and biaxial load.

Wed, 2013-04-24 07:13 - Myung Rae ChoDear all.

I'm currently doing some research concerning crack path prediction in brittle thin film.

But I'm struggled to find efficient way to do it.

In reality my case: stress is higly confined within semi infinite narrow rectangular strip patten and out of this rectangular, stress is very low or near 0 compared to stress within the pattern. Crack starts from left side end and propagates within pattern toward right end side of pattern. Crack show wavy propagation behavior with regular period and amplitude.

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## SIF for 3D crack in ANSYS

Mon, 2010-07-19 04:18 - himanshu_pathakDear all

I am searching for procedure to calculate stress intensity factor of bonded repair of cracked plate, so any one has any idea how to calculate stress intensity factor in 3D crack model By ANSYS, please guide me. I need your help.

Looking for your help.

Please share your valuable documents at:-

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## relationship between CTOA and SIF

Sat, 2010-03-27 13:46 - banafsh84- Read more about relationship between CTOA and SIF
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## Stress intensity factors for a slanted crack under compression

Sun, 2009-05-03 17:51 - Julien JonvauxHello everyone,

Here is the problem I have: I'm modeling the geometry of a simple straight edge crack in a 2D elastic medium using Abaqus. I assume plain stress conditions. The crack makes an angle with the horizontal, is small enough to be considered as embedded in an infinite domain (ratio crack length/size of domain < 1/10) and I apply a vertical compressive load on top of my domain. I fixed one point in displacement at the bottom of it and the whole bottom edge is constrained not to move vertically.

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## Why does the overshoot occur in Dynamic Stress Intensity Factor

Thu, 2008-01-24 05:21 - Sandip HaldarI 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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## Spacing effect on dislocation injection from sharp features in strained silicon structures

Fri, 2006-12-08 14:39 - Juil Yoon In practice, the SiN stripes or pads are periodically patterned on silicon, so the spacing effect on dislocation injection from sharp features deserves attention. As in Figure 1, the SiN stripes with residue stress, of width *L* and thickness *h*, are periodically patterned with spacing *S*. In the numerical calculation, we take shear modulus and Poisson’s ratio of Si3N4 to be 54.3 GPa and 0.27, and those of silicon 68.1GPa and 0.22, the same as in Ref.[1].

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## A method to analyze dislocation injection from sharp features in strained silicon structures

Tue, 2006-11-14 22:08 - Zhen ZhangStresses inevitably arise in a microelectronic device due to mismatch in coefficients of thermal expansion, mismatch in lattice constants, and growth of materials. Moreover, in the technology of strained silicon devices, stresses have been deliberately introduced to increase carrier mobility. A device usually contains sharp features like edges and corners, which may intensify stresses, inject dislocations into silicon, and fail the device.

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