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波动问题是实际工程中常见的问题,特别是对于坝体、岩体等大体量结构,波动的影响尤为显著。而在强动力作用下,材料的应力-应变特性往往会进入非线性阶段,进而使得波场的行为变得非常复杂。本文针对大体积工程结构中常见的伪脆性材料,展开非线性波动分析和研究。首先针对伪脆性材料的3个典型的非线性特性,即软化、残余变形以及滞回耗能,采用损伤滞回模型进行描述。然后基于精细有限元模型和显式积分方法,对伪脆性材料的一维非线性波场进行了数值模拟。最后基于数值模拟结果讨论了伪脆性材料非线性波场的能量耗散、色散效应以及变形集中。本文结果为强动力作用下大体积伪脆性材料结构的分析和模拟垫定了基础。
Fluctuation is a common problem in practical engineering, especially for the dam body, rock mass and other structures, the impact of volatility is particularly significant. However, under the action of strong force, the stress-strain characteristics of the material tend to enter the nonlinear phase, which makes the wavefield behave very complicated. In this paper, aiming at the pseudo-brittle materials commonly found in large-volume engineering structures, nonlinear fluctuation analysis and research are carried out. First of all, for the three typical non-linear characteristics of pseudo-brittle materials, namely, softening, residual deformation and hysteretic energy consumption, the damage hysteresis model is used to describe. Then based on the fine finite element model and the explicit integral method, the one-dimensional nonlinear wave field of the pseudo-brittle material is numerically simulated. Finally, based on the numerical simulation results, the energy dissipation, dispersion effect and deformation concentration in the nonlinear wave field of pseudo-brittle material are discussed. The results of this paper provide the basis for the analysis and simulation of large-volume pseudo-brittle materials under strong dynamic loads.