Effects of non-uniform strains on tensile fracture of fiber-reinforced ceramic–matrix composites have not been satisfactorily explained by existing mechanics-based models. In this paper, we use an exact model of fiber fragmentation under global load sharing conditions to predict fracture in three model problems in which non-uniform strains occur: (i) an end-constrained plate subject to a linear...

Disordered soft materials, such as fibrous networks in biological contexts, exhibit a nonlinear elastic response. We study such nonlinear behavior with a minimal model for networks on lattice geometries with simple Hookian elements with disordered spring constant. By developing a mean-field approach to calculate the differential elastic bulk modulus for the macroscopic network response of such ...

Hypothesis / aims of study Acute changes in detrusor tension may be important in both overactive bladder syndrome (OAB) and detrusor underactivity (DU). Total detrusor tension can be analyzed according to its component parts: the active tension (Ta) generated by detrusor smooth muscle (DSM) contraction and the preload (Tp). Tp can be further sub-divided into passive tension (Tpas) derived from ...

The charge-density-wave transition in TiSe (2), which results in a commensurate (2x2x2) superlattice at temperatures below approximately 200 K, presumably involves softening of a zone-boundary phonon mode. For the first time, this phonon-softening behavior has been examined over a wide temperature range by synchrotron x-ray thermal diffuse scattering.

When different strain hardening, strain-rate sensitive and temperature softening materials are used for scaled model prototype, the traditional similarity laws of solid mechanics will be broken. Although research works in last twenty years have developed correction methods initial conditions to compensate distortion, their basic factors practically impeded inherent non-direct (depending on unkn...

This paper employs PVA, PE, steel fibers, as well the hybrids of two three fibers to reinforce alkali-activated slag (AAS) material, aiming prepare strain-hardening and clinker-free composites. The flexural strength, compressive uniaxial tensile performance composites bond behavior between matrix were tested clarify reinforcement effects different on matrix. Strain-hardening AAS materials are o...

We report on a cellular pattern which spontaneously forms at the surface of a thin layer of a cohesive granular material submitted to in-plane stretching. We present a simple model in which the mechanism responsible of the instability is the "strain softening" exhibited by humid granular materials above a typical strain. Our analysis indicates that such a type of instability should be observed ...

Large-deformation finite element (LDFE) analysis with the coupled Eulerian–Lagrangian (CEL) technique for large-deformation soil functions without twisting or distorting mesh. However, model does not consider strain-softening and strain-rate dependence of clay-based soils. The undrained shear strength clay is sensitive to strain rate. In addition, effect reduction accompanied by large-scale def...

Poly-Carbonate (PC) and Poly-Methyl-Methacrylate (PMMA) are lightweight and mechanically tough transparent glassy polymers. Their mechanical behavior at low to moderate strain rates has been well characterized; however, that at high strain rates needs additional work. We propose two modifications to existing pressure-dependent viscoplastic constitutive equations that enable one to simulate bett...

A triaxial constitutive model is developed for elastoplastic behavior of geomaterials, which accounts for tensile damage. The constitutive setting is formulated in the framework of continuum thermodynamics using internal variables. The interaction of elastic damage and plastic flow is examined with the help of very simple constitutive assumptions: (i) a Drucker-Prager yield function is used to ...