通过关键词查论文: Energy Release

文章题目页数

作者: J.M. Guilemany, J. Fernández, F. Peregrin, O. Guixá
655
作者: Qing Tao Wang, Jue Ding, Meng Kan Ying, Bao Liang Zhang
摘要: Blast can cause serious loss of people live and property,and heavy damage on building structures. So, a numerical study on internal-blast-field characteristics and dynamic response of concrete by aluminized explosive was conducted. Moreover, three energy release models of aluminized explosive with combustion effects were compared and analyzed. The numerical study shows that the ignition and growth model is one three-form equation of reaction rate, which can describe unsteady detonation process of non-ideal explosives well. So, in this paper, the energy release model of aluminized explosive based on the Lee-Tarver rate equation was utilized, and an internal-blast dynamic model of concrete was established. The smoothed particle hydrodynamics (SPH) method was adopted to research the explosion field and damage effects of concrete, and provides an important way to evaluate the damage effect of internal-blast of the concrete.
420
作者: Xeniya Ryabkina, Olga Stepanova
摘要: The mathematical formulation of space-time energy release function of accelerated ions in solids is presented. High-power pulsed ion beam and continuous focused ion beam interaction with metals are considered. The power density of deposited energy and specific energy input in a target have been calculated. A beam energy fraction expended on the collisional sputtering of target atoms has been estimated.
7
作者: Xian Min Han, Shou Ding Li
摘要: Experiments of unloading confining pressure of rock were conducted to reveal deformation characteristics of rock mass under different excavation intension in thigh geostress condition. It were concluded from tests that volumetric strain of rock is inverse proportional to unloading rate. The smaller the unloading rate, the bigger the ductility of rock. Energy release are bigger under high unloading rate than that under low unloading rate. That means that tendency of rock burst turn smaller when unloading rates decrease.
2885
作者: Ji Zhang
摘要: This paper examines the free energy potentials of damaged solids for the construction of damage mechanics constitutive models. The physical meaning of free energy in solid mechanics is analyzed in contrast with that in traditional fields of thermodynamics; 1D stress-strain curves are used to show the relationships between various thermodynamic state functions in isothermal loading processes; and the role of plastic free energy in damage evolution is discussed both macroscopically and microscopically. It is concluded that plastic free energy, which is a macroscopic representation of some additional microscopic elastic energy, cannot do work during unloading but get released when damage takes place, constituting part of the driving force for damage evolution.
1741
作者: Guo Shao Su, Guo Qing Chen, Hong Fei Zhou
摘要: A novel numerical model for simulating fracturing process of the heterogeneous materials such as rock or rocklike material has been developed and implemented in the FLAC, which is the numerical code for the engineering mechanics analysis. A constitutive model that captures an essential component of brittle material failure, that is, cohesion weakening and frictional strengthening (CWFS) is improved by taking accounting the elastic modulus of element may degrade when the element failure. Furthermore, a new energy index, Local Energy Release Rate (LERR), is put forward to simulate energy release during failure process by tracking the peak and trough values of elastic strain energy intensity before and after brittle failure. The numerical model has applied to simulate the initiation, propagation and coalescence of cracks in the failure processes of brittle material. Using this numerical model, we studied the failure processes of simulated rock specimens with different heterogeneity. The results suggest that the model is a powerful approach to the study of macroscopic fracturing behaviour of heterogeneous material.
930
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