Uniaxial ratchetting of polymer and polymer matrix composites: Time-dependent experimental observations

摘要: Abstract The uniaxial time-dependent ratchetting of polyester resin and glass fiber reinforced matrix composites was observed by the stress-controlled cyclic tension–compression with non-zero tensile mean stress tension–tension tests at room temperature. After had been different loading conditions including some time-related factors, such as rate peak hold, evolutions continuous short were also investigated tests, respectively. It is concluded that: both its present apparent deformation, i.e., strain accumulates progressively in direction during tests; depends on applied amplitude, stress, obvious even for high volume fraction (such 40% 50%); mainly stems from viscosity resin, while addition into improves resistance to deformation lowers time-dependence simultaneously.