We present creep experiments on fiber composite materials. Recorded strain rates and acoustic emission (AE) rates exhibit both a power law relaxation in the primary creep regime and a power-law acceleration before global failure. In particular, we observe time-to-failure power laws in the tertiary regime for acoustic emissions over four decades in time. We also discover correlations between som...

Decellularized allografts offer potential as heart valve substitutes and scaffolds for cell seeding. The effects of decellularization on the quasi-static and time-dependent mechanical behavior of the pulmonary valve leaflet under biaxial loading conditions have not previously been reported in the literature. In the current study, the stress-strain, relaxation and creep behaviors of the ovine pu...

The creep and stress relaxation behaviors of coal are common in mining. unified constitutive model is suitable to describe predict both the evolution characteristics rocks. generalized Kelvin core element for traditional improved component models reflect nonlinear relaxation. In this paper, an damage model, which could relation evolution, was established based on a comparison models, responding...

In the Present study, attempt will be made to propose a new method for prediction of long-term essential creep of concrete utilizing some short-term creep tests under high temperature. To do so, regarding the similarities between essential creep of concrete and creep in viscoelastic materials, the time–temperature equivalence relation in viscoelastic materials is evaluated for concrete. This re...

Micrometer-sized Hall probes are used to measure the low-temperature magnetic properties of HgBa2Ca2Cu3O81d single crystals with and without columnar defects. Introduction of columnar defects by heavy-ion irradiation suppresses the quasiexponential temperature dependence of the critical current, but only when the density of flux lines is less than the density of defects. The current-dependent c...

This paper investigates the influence of stress level and hygrothermal conditions on creep/recovery behaviour three high-grade composites made GreenPoxy flax hemp fibres. The results show that levels instantaneous, time-delayed residual strains increase with applied load severity environment. materials are higher in creep phase than recovery phase. A stiffening effect is also observed during po...

adhesion level for the proper running of rail wheelset on track is crucial problem in detecting slippage to avoid accidents. the slippage of rail wheels has been observed applying forward and lateral motions to slip velocity and torsion motion. the longitudinal and lateral forces behavior is watched with respect to traction force to note correlation based on angle of attack. the deriving torque...

The viscoplastic behavior of a carbon-fiber/polymer matrix composite was investigated through two different modeling efforts. The first model is phenomenological in nature and utilizes the tensile and stress relaxation experiments to predict the creep strain. The phenomenological model was constructed based on the overstress viscoplastic model. In the second model, the composite viscoplastic be...

The polymer liquid crystal PLC is the PET/0.6PHB copolymer; PET5poly~ethylene terephthalate!, PHB5r-hydroxybenzoic acid ~LC!: 0.65the mole fraction of PHB. This is a multiphase system with PHB-rich islands in a PET-rich matrix. Tensile creep compliance was measured isothermally from 20 °C to 160 °C in 10 °C intervals. Master curves were determined using the time–temperature superposition for 20...