Use of Finite Element Analysis to Determine Extent of Damage

Case Study #1

F.E.A
Finite Element Analysis, Computer-Based numerical technique.
Consignment consisted of CT System, weighing about 5 m/t. was lifted by a forklift machine which fell.

Underwriter appointed Shomroni International Marine Surveyors to assess extent of damage and with whom liability lies.

Inspection Results
Inspection was done by visual means. Gantry Cover was damaged and External Holding Frame was badly bent. Personnel were reluctant to test system, following which Consignee demanded Total Loss, due to latent defects which may be discovered later, i.e. even if inspection result is negative there is a possibility that damage may become apparent following operational time, thereby causing customer dissatisfaction and service expense.

Surveyor recommended that finite element non-linear analysis should be conducted. Tests should clarify if intensity of blow is within Supplier's specifications. If affirmative, unit can be repaired.

Finite Element Analysis Description:
F.E.A
Finite Element Analysis, Computer-Based numerical technique.
Model was generated and run using Ansys 6.1 general purpose Finite Element Code. Analysis is Non-linear static due to plasticity effects of simulation.

Conclusions from Analytical Report
Loads required to bring structure to this free deformed position were 9 ton. Total mass of said structure is 3 ton; therefore, impact is 3g. Machine was planned to operate with forces of 12g. Consequently, inasmuch as machine had been professionally packed, thus reducing impact energy, results did not exceed Supplier's specifications.

Extent of Damage
Surveyor concluded that, other than external fairings of machine enclosure, primary structure of machine had not sustained any permanent deformation.


Conclusion of above case:
Underwriters submitted negligible monetary settlement, to which Consignee consented.


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