Experimental investigation of yield and hysteresis behaviour of an epoxy resin under cyclic compression in the large deformation regime

• DOI: 10.3144/expresspolymlett.2024.11
• Publication Date: 2023-12-06T13:21:12Z
• Authors: Jingwei Yu; Christian Breite; Frederik Van Loock; Thomas Pardoen; Yentl Swolfs
• Keywords: Hysteresis

High-performance polymers are extensively used in various applications undergoing long-term cyclic loadings.The deformation behaviour of an amorphous thermoset epoxy resin compressive loading is investigated for a range applied levels.The measurements indicate significant hysteresis upon repeated and unloading cycles with progressive accumulation plastic strain.Cyclic damage leads to reduction the stress needed reach peak strain per cycle, while stiffening corresponding increase elastic modulus increasing number observed, attributed chain orientation effects.The dissipated energy asymptotically decreases zero under strain-controlled cycling conditions.Interestingly, when monotonically loaded after cycling, exhibits yield strength.This 're-yield' level closely related selected value (unloading) increases cycles.