Khalid Farrag
Papers # 2014 Chicago
The paper presents a testing program for the evaluation of the long-term performance of composite structural liners for use in the rehabilitation of transmission and distribution liquid and gas pipelines. The paper first reviews previous research efforts, identifies the approach, and presents a testing program to characterize the composite’s materials properties, its long-term performance, and failure mechanism.
The long-term testing procedure of the composite liners implements the load-timetemperature superposition principals in cyclic loading tests. Two procedures, namely; the rate process and the dynamic response (i.e., frequency response in the linear viscoelastic region) are used to predict the performance from static and cyclic loading tests, respectively. The procedures establish the relationship between the strength of the material at certain temperatures and times and the results of the temperaturedependency response are used to provide the predictions of the long-term of the composite liner materials.
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