Cyclic compressive loading tests were carried out on bovine femoral bones at body temperature (37 °C), with varying mean stresses (-55 to -80 MPa) and loading frequencies (0.5-5 Hz). At various times, the cyclic loading was interrupted to carry out high-energy X-ray scattering measurements of the internal strains developing in the hydroxyapatite (HAP) platelets and the collagen fibrils. The res...

The tensile creep and creep-recovery behavior of a unidirectional Sic-fiher/Si,N,-matrix composite was investigated at 1200°C in air. A primary objective of the study was to determine how various sustained and cyclic creep loading histories would influence the creep rate, accumulated creep strain, and the amount of strain recovered upon specimen unloading. The key results obtained from the inve...

The mechanical loading frequency affects the functional properties of shape memory alloys (SMA). Thus, it is necessary to study effect in order use successfully these materials real structures. Based on pseudoelastic cyclic behavior, experimental methodology that allows testing NiTi wires stress controlled mode proposed. Cyclic tensile tests are carried out using universal machine STM-100 at ro...

Microstructural features and their evolution during cyclic deformation directly impact the low cycle fatigue (LCF) life of additively manufactured Laser Powder Bed Fusion (LPBF) Ti–6Al–4V. Tensile strain controlled LCF tests were performed at room (RT) elevated temperature (ET, @ 400 °C) to study softening behaviour failure mechanism LPBF The α′ grains free dislocation density studied using Ele...

Components made of nickel-based alloys are typically used for high-temperature applications because their high corrosion resistance and very good creep fatigue strength, even at temperatures around 1000 °C. Corrosive damage can significantly reduce the mechanical properties expected remaining service life components. In present study, a new method was introduced to continuously determine change...

The high-cycle accumulation (HCA) model by Niemunis et al. allows the prediction of mechanical response sand under millions load cycles . It has originally been developed with focus on drained high-cyclic loading assuming a constant strain amplitude, which can be periodically updated. In order to apply it for partially or fully undrained conditions, an adaptive definition amplitude is proposed ...

A three-dimensional framework for low-cycle fatigue analysis of polycrystalline aggregates is proposed in this work. First, a cohesive law coupling plasticity and damage developed modelling cycle-by-cycle degradation material interfaces up to complete de-cohesion failure. The may model both quasi-static under increasing monotonic load cyclic loading, through coupled plasticity-damage whose acti...