Influence Of Microscopic Structure Research Articles

The microscopic failure mechanism and energy evolution law of foamed concrete under uniaxial compression

This paper uses the macroscopic stress–strain curve of foamed concrete under uniaxial compression as a baseline reference, combining the micro-failure mechanisms of the internal structure and the laws of energy evolution to explain the macroscopic mechanical behavior. This study proposes the mechanisms behind pore fracture and recombination, as well as the mechanical interactions within thin-walled structures. The fractured structure swiftly fills and restores the framework, while the reticulated thin-walled structure adjusts transmission pathways for forces, inducing dormant elastic strain energy and thereby prolonging the interval of residual strain. Coupled with macroscopic laws dictating energy evolution, this paper elaborates on the influence of microscopic structures on stress–strain characteristics. The capacity of foam concrete to proficiently absorb and dissipate external energy, thereby extending the duration of the strain process, and its potential as a buffering material are substantiated.

Toward the thermodynamic modeling of reacting ionic mixtures

Based on the Muller–Liu entropy principle and the axioms of constitutive theory, a continuum model for reacting ionic mixtures is presented. The influence of microscopic structure on the mixture dynamics is taken into account through the thermodynamics of polar materials. Moreover, mechanical balance laws for classical mixtures under influence of electromagnetic fields and quasi-electrostatic Maxwell’s equations are briefly shown. With an appropriate constitutive model for a diluted and isotropic mixture of non-volatile solutes and by considering the same temperature field for all constituents, constraints on constitutive quantities are imposed, and the conditions for the thermodynamic equilibrium are established from the entropy principle. Furthermore, the nonlinear nature of chemical reactions as well as the reciprocal nature of some irreversible processes is highlighted. Unlike the classical approach for electrolyte solutions, the current constitutive model incorporates thermoelectric and electro-kinetic phenomena into the phenomenological equations, providing a more comprehensive approach of electrolyte solutions dynamics.

Study on Microscopic Structure and Mineral Composition of Shallow Rock Using SEM

Microscopic structure and mineral composition of shallow rock in different geological group were detect using scanning electron microscopy technology, and the influence of microscopic structure and mineral composition on macro-mechanical properties was analyzed. The results showed that: from the surface to the coal seam: sandy mudstone particle surface banded, non-directional distribution into flake orientation distribution point - point contact - surface contact into contact between particles, resulting in the rock mass more easily broken, the breaking the block becomes small; the sandy mudstone particle volume decreases, the smaller the gap between the particles, and by filling into velvet spherical aggregates filling, resulting in increased contact area in the rock mass fracture; sandy shale montmorillonite content increases, the rock mass in the water particle volume expansion, extrusion intergranular pore, reduce pore channel, the rock mass macroscopic pass water to reduce.

Influence of microscopic structure on the abrasivity of rock as determined by the pin-on-disc test : Verhoef, P N W van den Bold H J, Vermer, T W M Proc 6th International Congress International Association of Engineering Geology, Amsterdam, 6–10 August 1990V1, P495–503. Publ rotterdam: A A Balkema, 1990

Influence of microscopic structure on the abrasivity of rock as determined by the pin-on-disc test : Verhoef, P N W van den Bold H J, Vermer, T W M Proc 6th International Congress International Association of Engineering Geology, Amsterdam, 6–10 August 1990V1, P495–503. Publ rotterdam: A A Balkema, 1990

Effect of Microscopic Structure on the Corrosion Cracking of 13Cr Stainless Steels by the Aqueous Solutions containing Hydrogen-Sulfide

An investigation was made about the influence of microscopic structure on the sulfide cracking resistance of some modified 13 chromium stainless steels.Martensite and sorbite structure with grain boundary, chromium carbide were cracked in short time, while sorbite without grain boundary carbide, ferrite, ferrite+sorbite and martensit with 10% ferrite were not cracked.As for strength level, those of quenched-and-temperd to have proof stress ≤70kg/mm2 showed no cracking. But, martensite structure with 10% ferrite, never cracked although its proof stress is 90kg/mm2.