Analysis Of Concrete Damage Phase Transition Synergy

Engineering strength of concrete damage has been a hot area of academic research, althoughmany researchers for concrete damage and destruction has been carried out extensive research formany years, while, not to find a satisfactory answer. As to Academician Qian classified as "noteven the basic concept is very clear question." In fact, the destruction of a variety of scales ofconcrete damage evolution, development and accumulation of the result, from the micro-scalebreaking of atomic bonds, the lattice dislocations (10-16-10^-10m) and other changes in thecomposition, to macro-scale structural elements of damage, fracture (10^-3-10⁰m) production, so theclassical sense of the concrete damage mechanics model of scale (10^-4-10-6m), the share of thedamage evolution scale the proportion is very small. Therefore, to comprehensive and objectivedescription of damage evolution of concrete, it can not be limited to a damage scale studies, butfrom the perspective of the system, by means of advanced and mature system methodology, learntogether as described below, to its a study.Synergetics founder H.Haken found in the study of laser physics, a system far fromequilibrium occur in the disorder and orderly transition, with the balance between the phasetransition has some similar properties, and this similarity in physics, chemistry, biology and otherdisciplines, have a universal significance. Therefore, you can research a particular area of systemschange approach applied to other areas of the system to study the phase transition, which is thephase transition analogy synergetic thinking. After nearly half a century of development,collaborative learning phase change analogy method has been developed, and in all fields have alarge number of applications.The large number of experiments have shown that damage evolution in the concrete, thedamage from the initial distribution of the random disorder gradually evolved into an orderlydistribution of damage to the regional focus, which is the evolution from disorder to orderdemonstrated the unique phenomenon, with obvious self-organizing feature. Therefore, concreteinjury from the essence, is the internal damage in the various subsystems on the basis ofcollaboration, the role of the outside world have a variety of self-organization of a clear responseto the phenomenological expression, its characteristics and equilibrium appearphase transitionsimilar.Based on damage evolution of concrete has a phase change characteristics of thephenomenological expression, we can balance the phase change of mean-field theory, that Landautheory of phase transitions of the basic concepts and treatment methods, analog-to-concretedamage to the phase transition process. While taking into account the critical point of phasetransition Landau theory often fails, so the phase transition in the study of concrete damageprocess must take into account fluctuations in power, that is, Generalized Ginzburg-Landautheory. This article is based on this theory, the use of phase change analogy synergetics ideas,expand on the concrete damage phase transition studied. Solution out of the concrete damageconstitutive equation and its solution with the linear and nonlinear solutions, and meet MarKovprocess correlation function, according to the obtained correlation function analysis of the phasetransition process of concrete damage. Then by means of large-scale numerical simulation RFPA, by simulati ng the damage process of concrete acoustic e mission st udy of da mage ph enomenon ofphase transiti on t o verify the correctness of the conclusi ons.