Brittleness is an essential parameter to determine the deformation and failure behavior of rocks, it useful quantify brittleness rocks in numerus engineering practices. A novel energy-based evaluation index proposed this study, which redefines dissipated proportion ultimate elastic strain energy relative post-peak residual energy. series conventional triaxial compression (CTC) tests were perfor...

The concept of brittleness plays a crucial role in the development of tight oil and gas as it reflects a rock’s ability to fail and maintain a fracture in a hydraulic fracture experiment. Conventional methods that attempt to quantify the degree of brittleness associated with a rock mass have a few shortcomings. For example, failure criteria are not used and only the effective moduli are conside...

Abstract To quantitatively evaluate the influence of high true three-dimensional stresses on ductile–brittle behaviours rock in deep underground engineering, a series triaxial compression tests with different stress levels were carried out marble and four kinds granite. The influences states ( σ 2 , 3 ) post-peak characteristics analysed, new normalized evaluation index was proposed based energ...

Brittleness of materials—whether it occurs naturally or with aging—affects significantly performance and manifests itself in various properties. In the past, brittleness was defined qualitatively, but now a definition of brittleness for viscoelastic materials exists, enabling analysis of all types of polymer-based materials. The quantity brittleness, B, has been evaluated for neat thermoplastic...

This paper presents a novel Bayesian-based method for predicting brittleness. The involves synthesizing petrophysical data from multiple well cores to establish joint Gaussian distribution function shale facies and non-shale facies. Furthermore, Bayesian classification is applied seismic data. proposed combines with Rickman brittleness obtain new index. are utilized enhance the differentiation ...

The wear of polymer-based materials is connected to their brittleness. We have previously formulated a quantitative definition of brittleness in terms of elongation at break and storage modulus for thermoplastic polymers. We provide a formula connecting brittleness to viscoelastic recovery (healing) after sliding wear. Our model fits a selection of ten thermoplastics representing several classe...

Though many of the current symbolic problem solvers have attempted to combat "brittleness" with learning procedures, here at the Computing Research Laboratory (CRL) an alternative approach has been developed based on achieving symbolic plasticity through model generation. This paper describes the evolutionary-Model Generative Reasoning (e-MGR) architecture that implements this approach, and dis...