Summary
An important aspect of the design of transmission line insulators is the mechanic answer to different loadings including highly dynamic cases like load transfer or ice drop. In the latter cases an assessment using force balances as per IEC 61109 is only limited in predicting the failure behaviour. The main reason is that this design method is not able to take into account the detailed damage state and accumulation of a given Glass Fibre Reinforced Plastic (GFRP) rod and especially the sharp stress increase at crack tips. Within this contribution typical examples of damage accumulation as well as mechanical fatigue are presented. Based on this description the basics of fracture mechanics are shortly explained. From its foundations in 1919 this method has been established as the preferred design methodology to assess brittle materials. In addition the method can be extended to enable a material's based lifetime assessment for dynamic (vibration) and static fatigue (corrosion) for both monolithic ceramics and fibre reinforced brittle materials.
Additional informations
| Publication type | ISH Collection |
|---|---|
| Reference | ISH2015_104 |
| Publication year | 2015 |
| Publisher | ISH |
| File size | 524 KB |
| Price for non member | Free |
| Price for member | Free |
Authors
Li Shengtao, Garnacho Fernando
