Proceedings of the Korean Reliability Society Conference (한국신뢰성학회:학술대회논문집)
- 2005.06a
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- Pages.69-73
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- 2005
Stepped Isothermal Methods Using Time-Temperature Superposition Principles for Lifetime Prediction of Polyester Geogrids
- Koo Hyun-Jin (Reliability Assessment Center, FITI Testing & Research Institute) ;
- Kim You-Kyum (Reliability Assessment Center, FITI Testing & Research Institute) ;
- Kim Dong-Whan (Reliability Assessment Center, FITI Testing & Research Institute)
- Published : 2005.06.01
Abstract
The failure of geogrids used for soil reinforcement application can be defined as an excessive creep strain which causes the collapse of slopes and embankments. Accordingly, the lifetime is evaluated as a time to reach the excessive creep strain using two accelerated creep testing methods, time-temperature superposition(TTS) and stepped isothermal methods(SIM). TTS is a well-accepted acceleration method to evaluate creep behavior of polymeric materials, while SIM was developed in the last ten years mainly to shorten testing time and minimize the uncertainty associated with inherent variability of multi-specimen tests. The SIM test is usually performed using single rib of geogrids for temperature steps of
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