The complete stress strain relation using the new model in numerical unloading test was obtained.
In this paper, fiber Bragg grating (FBG) sensors were used for monitoring the crack of two CFRP concrete composite arches in MTS loading and unloading test.
Since schistose plane orientation is one of the key factors to control the formation of macro-cracks and hence failures of unloading test specimens, these engineering geological characters should be taken into consideration in engineering design.
The gas bearing coal-sandstone combined samples were subjected to unloading tests, including unloading confining pressure (UCP) under constant axial tests and UCP-reloading axial stress (UCP-RAS) tests.
Based on energy-transfer analysis of triaxial unloading tests under four different controlling conditions, the rock burst energy release rate (RBERR -an eneRBERR -an combining thenergyl energy release rate (LERR) and the lindexenergy storage rate (LESR), was proposed.
Cyclic tensile loading-unloading test is also carried out to study the deformation behavior.
The initial stiffness of beams is observed by cyclic loading-unloading test during the corrosion procedure.
Three heating and loading conditions have been used by researchers in this area: preloaded and tested hot, unloaded and tested hot, and unloaded and tested at room temperature.
In order to reveal the influence of the intermediate principal stress (σ2) on slabbing failure, true triaxial unloading compressive test was carried out based on the stress path of the underground engineering excavation, i.e., unloading the minimum principal stress (σ3), keeping σ2, increasing the maximum principal stress (σ1).
A full suite of temperature-dependent plastic and damage parameters in the model are determined through cyclic loading-unloading tests.
Tensile and loading-unloading tests were performed with applying initial load to high-carbon steel wire (diameters of 0.06 0.296 mm) through capstan-type grippers for non-metal fiber.
