PRESS RELEASE

Strand7 Non-linear analysis used to solve bracket deformation problem

WBM Gippsland has been using Strand7 to investigate structural deformations that were occurring in their clients’ paper roll lifting mechanism.

The bucket mechanism is used to lift 3 tonne rolls of paper onto a conveyor system for further handling and processing.

The client identified that permanent deformation of some of the main structural members had occurred over repeated operation of the lift. Some local pull-out of holding down bolts had also occurred.

WBM was contracted to investigate the potential cause of this deformation and devise remedial changes.

Strand7 was used to create a global model with sufficient detail to investigate some of the local stresses close to the bucket hinge and ram points.

The paper bucket is hinged about 2 support points and lifted via 2 hydraulic rams.

The model was essentially divided into two zones. The first zone was the area away from the zone of influence. This incorporated the conveyor system behind the main lift bucket. This was modelled using Strand7 beam elements.

The second area, the zone of interest, was modelled in detail with shell elements and the 3 tonne paper roll represented as lumped mass.

A nonlinear static analysis was run. The load increments were chosen such that the bucket was lifted through its full operation cycle by applying appropriate strains to the lifting rams.

The Strand7 model was used by WBM to identify the most appropriate remedial measures to ensure ongoing structural integrity.

The Strand7 consulting service many be accessed in South Africa through Allyson Lawless and Associates. Allyson Lawless has been involved in structural and civil engineering software development, customization and supply for 25 years. Recently joined by Gary Styger, a mechanical technologist, the company is in a position to supply the software, offer training (on site or in structured classes), ongoing software support and engineering consultancy services. Full product details and a fully functional demonstration version are available from the Johannesburg office or from the website www.strand7.com.

For more information contact Allyson or Gary on 011-476 4100.