While NASGRO is a widely used software tool for fracture simulation it is limited to the simple geometrics included in its library. The interface to NASGRO available in BEASY enables you to build upon the NASGRO capabilities to predict crack growth in more realistic and complex structures whilst continuing to use the NASGRO crack growth laws and materials data.
BEASY’s Fracture & Fatigue Crack Growth (FCG) software enables engineers to quickly develop high fidelity fracture mechanics models based on the actual structural component geometry and loading, therefore providing more accurate critically important data on stress intensity factors, crack growth and crack shape evolution.
- Easily move from NASGRO reference book solutions to more realistic geometry and loading
- Uses a mixed mode stress intensity factor solution (KI, KII, KIII) to simulate accurate, nonplanar, crack shape evolution (not restricted to Mode 1 solutions)
- Predict SIFs and fatigue crack growth under complex multiaxial loading
- Support for multiple cracks and coplanar crack coalescence
- Simulate crack growth in residual stress fields
Predicting the Impact of Hydrogen on Cracks
With the recent interest in the use of Hydrogen as an alternative fuel and the issues regarding its distribution, in this issue we are reviewing the results of a research project in which BEASY engineers investigated the impact of hydrogen on the integrity of gas transmission pipelines.
Software was developed to predict how adding hydrogen to the natural gas distribution network would affect the probability of failure. Hydrogen has been demonstrated to change the behaviour of crack like defects which may affect the safety of pipeline or make it more expensive to operate.
A stochastic approach was developed to assess the failure probability of the gas pipeline due to the existence of crack-lie defects including the operational aspects of the pipeline such as inspection and repair procedures. With various parameters such as crack sizes, material properties, internal pressure modelled as uncertainties, a reliability analysis based on failure assessment diagram was performed through direct Monte Carlo simulation.
The failure probabilities of each defect and the whole pipeline system were obtained from the simulation and different inspection and repair criteria were investigated to determine an optimal maintenance strategy.