PSI - Issue 28

Anurag Singh et al. / Procedia Structural Integrity 28 (2020) 2218–2227 Anurag Singh/ Structural Integrity Procedia 00 (2019) 000–000

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3.1.5. Maximum displacement The maximum displacement experienced increases up to the strain rate of 0.05/s and then show a decrease in the maximum strain rate. The maximum displacement almost remains constant with not much variation. The maximum displacement of the PGLA fibres decreases with the increase of strain rate, as the water molecules start to cleavage the chains of PGLA fibres, PGLA fibres are not able to reach higher values of maximum displacement. 3.1.6. Force at break After subjecting to the degradation stages, PGLA fibres show an increase in the force at break up to 15 days of degradation; on increasing the degradation days, the value of force at break reduces. Strain rate has a relatively low effect on the force at the break. However, at the last degradation stage, the force at break remains constant irrespective of the strain rate. This increase in the force at break is due to fibres gets swelled when subjected to degradation. Multifilament structure of PGLA induces lubrication within the structure, and this causes the filament inside the cylindrical casing more force to reach the failure.

Figure 6: Load vs engineering strain graph of PGLA fibres at different strain rates