The permeability of the sample firstly increased with the increase in the applied elastic stress and then decreased after the
yield point. The trend might be interpreted as follows.
Yield points, represented by georeferenced bags, presented a low spatial dependency, because semi-variance did not increase significantly together with the distance among the pairs of points analyzed (Figure 2), resulting in 69% randomness among points (Table 3).
Drilling fluid properties including density,
yield point, and viscosity are important factors which greatly affect the magnitude of surge and swab pressures generated during trip--in and trip--out operation respectively.
PETG socket specimens had tensile strengths occurring at the
yield point. In contrast, Thermolyn Rigid and Orfitrans Stiff had tensile strengths occurring at the break point.
Neat PEEK shows a typical polymer
yield point as compared to its composites, followed by a softening range, and a roughly straight sub domain up to 0.4 value of strain.
Through appropriate dimensioning of the sleeve, stresses up to the permissible upper
yield point of the pipe to be repaired can be absorbed.
The post yield deformation capacities for unwrapped columns were very low and the failure occurred just after the
yield point, indicating the lack of sustained resistance after the concrete core failed.
(i) AE commences shortly before the upper
yield point and