Fracture Simulation newsletter

BEASY Fracture Newsletter

Aircraft Airworthiness & Sustainment Conference

BEASY staff attended the 2015 AA&S Conference in Baltimore in April and met with many customers to discuss their applications and update them about projects underway at BEASY.  

We had a lot of new interest at our booth this year in the areas of fatigue crack growth in residual stress fields, fracture behaviour of composite plates as well as the modelling of corrosion related damage. There was also considerable interest in the BEASY Corrosion Manager software which is used to predict and simulate galvanic corrosion in structures such as aircraft.

Cold worked hole fracture May 15 edited

Of particular interest was the impact of residual stresses on the crack path and the rate of growth of cracks. The effect on the crack path can be clearly seen in the above figure where the lines show the predicted crack fronts as the crack grows from a hole with, and without, cold working. The red lines show the predicted crack fronts without cold working and the green dotted lines show the predicted crack fronts with cold working. The study clearly indicates the need to include residual stresses in crack growth calculations as otherwise unexpected failure modes can occur, and excessively conservative designs can result.

Please contact us for background papers on some of the topics presented at AA&S 2015, quoting the name(s) of the papers below:

Analysis of Fatigue Crack Growth for CFRP-Strengthened Steel Plates with Longitudinal Weld Attachments

Analysis of CFRP reinforced steel plates

Analysis of fatigue crack growth for welded connections under bending

Calculation of bending fatigue life of thin-rim spur gears

Analysis of fretting fatigue life of dovetail assemblies based on fracture mechanics method

Another area of considerable interest at the AA&S conference was the use of computer simulation to assess the risks associated with corrosion. During the product development process, various design configurations are often exposed to actual environmental conditions for an extended period of time to evaluate corrosion damage in the structural assembly. However, these testing methods require anywhere from several months to several years of exposure time in order to complete. Computer modelling has the potential to significantly shorten, and reduce, the cost of testing by providing a corrosion simulation option that can be used to supplement these long term experimental tests.

Galvanic Stack Up model fracture1 May 15 edited

In the model shown a computer simulation is used to predict the risk and extent of corrosion damage on a test structure.

BEASY Attends ICAF 2015

ICAF fracture May 2015

Dr Sharon Mellings will be attending the ICAF conference again this year. She will be presenting a paper on the topic of simulation of corrosion damage, stress concentrations, and fatigue crack growth, and describing technology that can be used to improve the design and maintenance of aircraft structures. 

Airframe structures regularly operate in environments that can experience high levels of corrosion damage, and this damage leads to stress concentrations within the structure and the lowering of the threshold for the development of cracks. Even if only a thin film of electrolyte is deposited on the structure, this can still lead to an electrical field that causes surface damage. This paper provides a methodology that can be used by design engineers, to identify potential problems in an airframe structure during initial development, giving scope to change designs and so reduce potential failures and in-service repair costs. This methodology identifies areas of the structure that have the greatest risk of damage - which may not be obvious without combined corrosion and fracture simulation; and so provides more informed targeting of locations where "what if" fracture mechanics should be applied.

The figure below shows the predicted geometry changes due to corrosion damage.

Corrosion damage fracture May 15

If you would like more information about corrosion and fracture simulation, please contact us

BEASY attend Aircraft Airworthiness & Sustainment (AA&S) Conference

AAS logo 2015

BEASY will be attending the Aircraft Airworthiness & Sustainability Conference where we will be presenting our corrosion and fracture mechanics simulation solutions for aerospace structures. The conference, will take place between March 30th and April 2nd in Baltimore, Maryland.

 

We welcome you to come and visit us on booth 206 to find out more about the capabilities of BEASY simulation products, or how BEASY fracture modelling can provide the solutions you need. Alternatively to make an appointment to meet Tom Curtin at the conference, or to obtain further information, please contact us

BEASY Fracture & Crack Growth V10R16

BEASY Fracture & Crack Growth 10.0r16 provides a great number of new and advanced features that enable engineers to improve fracture analysis and crack growth simulation and provide deeper design insight.

The new release incorporates improvements and enhancements to the core BEASY Fracture & Crack Growth software, allowing more crack growth simulations to be run automatically (such as analyses where only part of the crack is growing) and reducing the need for user intervention.

Aircraft Airworthiness & Sustainability Conference 2014

Airworthiness logo 2014 1 

BEASY will be exhibiting at the 2014 Aircraft Airworthiness & Sustainability Conference in Baltimore this April, presenting the latest developments in our Software and Services for Crack Growth Simulation and Corrosion Management in Aircraft Structures.

 

We welcome you to come and visit us at booth 404 to find out more about the capabilities of BEASY products, or how BEASY can help with your particular application. Alternatively to make an appointment to meet Tom Curtin at the conference, or to obtain further information, please contact us

AirworthinessMain12014BEASY Fatigue & Crack Growth

The BEASY Fatigue and Crack Growth software can be used to perform 3D crack growth simulations to support structural life extension decisions. Sophisticated analysis algorithms have been developed to investigate crack growth behavior in complex loading environments. For example load cases can include residual stresses, fretting fatigue, contact loading and thermal stresses. 

Interfaces are also available to enable BEASY to integrate with MSC PATRAN, NASTRAN, ABAQUS, and ANSYS. 

 

  

AirworthinessCorrosion12014BEASY Corrosion Manager  

BEASY Corrosion Manager Software enables engineers to quickly assess the risk to components and structures of corrosion and the effectiveness of surface protection systems.

 

BEASY Corrosion Manager simulations enable engineers to replace the "find it and fix it" approach and replace it with a more fundamental approach based on an understanding of the corrosion process and the ability to predict its behavior.

 

 

 

Fracture Simulation

Initial ABAQUS modelA focus of interest was BEASY's Fatigue and Crack Growth software used to perform 3D crack growth simulations to support structural life extension decisions and in particular its integration with Finite Element systems such as ABAQUS, ANSYS, NASTRAN and MSC PATRAN. This was demonstrated in a failure investigation where an ABAQUS stress analysis model was available and BEASY was used to perform the crack growth study to gain an understanding of the failure mode.