3 research outputs found
Amorphous shear bands in crystalline materials as drivers of plasticity
Traditionally, the formation of amorphous shear bands (SBs) in crystalline
materials has been undesirable, because SBs can nucleate voids and act as
precursors to fracture. They also form as a final stage of accumulated damage.
Only recently SBs were found to form in undefected crystals, where they serve
as the primary driver of plasticity without nucleating voids. Here, we have
discovered trends in materials properties that determine when amorphous shear
bands will form and whether they will drive plasticity or lead to fracture. We
have identified the materials systems that exhibit SB deformation, and by
varying the composition, we were able to switch from ductile to brittle
behavior. Our findings are based on a combination of experimental
characterization and atomistic simulations, and they provide a potential
strategy for increasing toughness of nominally brittle materials
Study on Damage Accumulation and Life Prediction with Loads below Fatigue Limit Based on a Modified Nonlinear Model
Most fatigue theories neglect the loads below fatigue limit in damage accumulation, which leads to inconsistency between the predicted and the actual fatigue lives. In this study, a novel damage model is proposed to take into account the loads below fatigue limit from two aspects: the strengthening effect and the cumulative damage. The strengthening effect is introduced by an exponential function and the cumulative damage is calculated by fuzzy method with membership functions (MFs). The proposed model is verified against the experimental data under variable amplitude loading conditions. It is found the modified model with Cauchy MF significantly reduces the relative error of predicted life from 35.18% (linear model) and 16.09% (original Chaboche model) to 8.38% (proposed model). As a case study, the proposed damage model is implemented to evaluate the service life of a compressor blade under variable amplitude loading spectrum containing small loads below the fatigue limit
Study on the Elastic–Plastic Correlation of Low-Cycle Fatigue for Variable Asymmetric Loadings
The mean stress effect in fatigue life varies by material and loading conditions. Therefore, a classical low cycle fatigue (LCF) model based on mean stress correction shows limits in asymmetric loading cases in both accuracy and applicability. In this paper, the effect of strain ratio (R) on LCF life is analyzed and a strain ratio-based model is presented for asymmetric loading cases. Two correction factors are introduced to express correlations between strain ratio and fatigue strength coefficient and between strain ratio and fatigue ductility coefficient. Verifications are conducted through four materials under different strain ratios: high-pressure tubing steel (HPTS), 2124-T851 aluminum alloy, epoxy resin and AZ61A magnesium alloy. Compared with current widely used LCF models, the proposed model shows a better life prediction accuracy and higher potential in implementation in symmetric and asymmetric loading cases for different materials. It is also found that the strain ratio-based correction is able to consider the damage of ratcheting strain that the mean stress-based models cannot