Stress relaxation data for the filled polymer which is independent of strain can be calculated by multiplying the relaxation modulus (at a certain strain) by (1 plus strain in the polymer matrix). Stress-strain curves at constant strain rate and for different concentrations of the filler can be...
Two different cyclic tests were performed under tensile stress, with a zero load ratio, R = 0. First, specimens were subjected to a sinusoidal load cycle at 1 Hz, which provided stress-life curves with the use of a failure criterion based on 12% yield strain. Second, specimens were ...
Figure 7. Stress−strain curves in CU test. (a) Deviatoric stress-strain behaviour; (b) Normalized deviator stress-strain behaviour. In addition, Figure 8 illustrates the effective stress paths obtained from the consolidated–undrained triaxial test. From the soil samples plotted on the p’-q...
Figure 7. Stress−strain curves in CU test. (a) Deviatoric stress-strain behaviour; (b) Normalized deviator stress-strain behaviour. In addition, Figure 8 illustrates the effective stress paths obtained from the consolidated–undrained triaxial test. From the soil samples plotted on the p’-q...
Figure 12 shows the engineering stress–strain curves derived using the typical method. There was a difference in expressing the test data depending on the curve characteristics of the constitutive model. Since the objective function of the typical method sets only RMSE minimization, it is evident ...
However, after implementing the static approach, it was not possible to proceed with the fatigue stress analysis due to the lack of literature data on the behavior of such plastic materials, with common cycle–stress curves being quite different from one investigation to another. Figure 7. Force...
Commonly applied semi-empirical fatigue models consist of fatigue damage parameters, which are scalar functions of spatial stress/strain components and reference fatigue curves. The fatigue damage parameter is used to reduce the spatial stress or strain state to a scalar quantity of the dimensions of...
Figure 11 shows the engineering compressive stress–strain curves for different lattice structures under considerable strain. When the load is applied, the initial curve is nonlinear and concave downwards, similar to the result in the literature [37], probably because slight deformation of the samples...
During cyclic tests, the stress–relative strain hysteresis curves changed shape as the number of cycles increased. They become narrower and gain a steeper slope. This reflects the evolution of the elastic properties of the paste as the number of cycles increases. On the other hand, the hysteres...
Figure 9. Compression curves in the elastic zone for each mesh size. The increase in definition in the stress spectrum increased with decreasing mesh size. A cross-section in the main axis of the cylinder, exactly at the center of the cylinder, as shown in Figure 10, showed the sections...