Finite Element analysis (FEA) is well established in many design processes. In product development FEA helps to identify highly stressed regions of structures, to predict deformations, to show the flow of forces, to identify resonance or to predict if components come into contact with one another under given loading conditions.

HERA has been using the Abaqus (www.simulia.com) general-purpose FE software on a variety of simulation challenges for many years.

Traditionally, stress contour plots from finite element models are often used to identify the points of interest in fatigue, and fatigue calculations are manually performed. However, from recent research, it has been shown that there may be little correlation between finite element stress contour plots and the locations of crack initiation sites, which might have significant implications on design.

To remedy this situation, computer-based fatigue analysis software based on the results from finite element analyses have been developed, which permit fatigue crack locations to be identified even when a combination of loads is considered.

In the interests of assisting its members, HERA has commenced using computer-based fatigue analysis software in the form of fe-safe™ durability (from www.safetechnology.com) together with Verity® in fe-safe™ weld fatigue and durability to the predict fatigue life of different components and details. Moreover, if measurements are available, fe-safe™ can also perform intelligent signal processing, prior to evaluating the fatigue life of the structure under consideration.

For further information on FE-based fatigue analysis, or FEA in general, the HERA brochure that concisely explains and illustrates the technology may be downloaded for free from www.hera.org.nz

Alternatively, should you wish to speak to us directly, please contact Nandor Mago on fea@hera.org.nz or 09 262 4752 (DDI).