These three quantities agreed fairly well with a point on a stress-strain curve obtained from a confined compression test of a cylinder of the same material. Vickers hardness is 3±0.3 times the compressive stress difference which is taken at a confining pressure of one-sixth of the hardness ...
With a newly developed Material Failure Process Analysis code (MFPA(2D)), influence of hetero geneity on fracture processes and strength characterization of brittle disorder materials such as rock or concrete is numerically studied under uniaxial compression and tension conditions. It is found th at...
The proposed model is applied to uniaxial tension and compression to illustrate nonlinear relationships between stress and longitudinal, lateral, and volumetric strains. The proposed model is compared with some of the existing theories. 展开 关键词: Theoretical or Mathematical/ brittleness compressive ...
The brittle material is modeled as an elastic material which cracks under tension. The cracked material is considered to be pulverized when it fails in compression, which is then characterized as a Mohr-Coulomb material with pressure dependent shear strength. The target resistance value found from ...
Crack initiation emerges due to a combination of elasticity, plasticity, and disorder, and it displays strong dependence on the material’s microstructural details. The characterization of the structural uncertainty in the original microstructure is typi
Under compression, failure occurs after about 0.1% shortening through either axial splitting (unconfined) or shear faulting (confined). Under both loading directions the brittle failure stress depends upon grain size (which controls crack size) in the Hall–Petch manner of metals and alloys (tension...
The origin of compression-induced failure in brittle solids has been a subject of debate. Using in situ, high-speed, strain field mapping of a representative material, polymethylmethacrylate, we reveal that shock loading leads to heterogeneity in a compressive strain field, which in turn gives ris...
The starting points of the discussion are quasi-static and dynamic mechanical properties of concrete-like strength in uniaxial compression, tension, plane stress conditions, and meridian plane, which are confronted with dynamic strength in tension and in compression. There are at least few constitutive...
Biaxial and uniaxial tension tests were performed with thin glass and zirconia disk specimens. The aims of this study is to clarify the fracture dependenceof brittle material in plane stress state and their difference between biaxial and uniaxial tension,baized on experimental and analytical approaches...
Brittle materials usually show higher ductility in compression than tension. To examine the tensile ductility of the quasicrystal pillars but avoid the complex experimental setup of the tensile test for sub-micrometer-sized samples, we employed micro-bending tests to induce an asymmetrical stress distri...