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perfect plastic model
相关语句
  相似匹配句对
     Perfect
     完美
短句来源
     Perfect
     完美人生(英文)
短句来源
     The constitution relationship of matrix is perfect elastic-plastic.
     假设断裂纤维附近的基体剪切屈服,基体的本构关系为理想弹塑性。
短句来源
     give you a perfect face PLASTIC OPERATION
     整形,给你一个完美面孔
短句来源
     PLASTIC FINISHING
     塑料涂装
短句来源
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Recently, cylindrical charges have been widely used as a kind of special charge structures in engineering and military blasting and attention has been paid to its further theoretical studies. This paper studies the parameters of the explosion cavity :n soil and its generated shock waves by using the finite difference method and the elastic-perfect-plas-tic model proposed by P.Chetuvik et al; An artificial viscosity is used to smooth discontinuities in calculation. Comparing the results of calculation...

Recently, cylindrical charges have been widely used as a kind of special charge structures in engineering and military blasting and attention has been paid to its further theoretical studies. This paper studies the parameters of the explosion cavity :n soil and its generated shock waves by using the finite difference method and the elastic-perfect-plas-tic model proposed by P.Chetuvik et al; An artificial viscosity is used to smooth discontinuities in calculation. Comparing the results of calculation with those obtained by the X ray photographic experiment, good agreement is obtained.A. Hypothesis and preliminary conditions:1. Cylindrical charge explosion in soil is considered as a transient detonation.2. The powdered RDX explosive is used with a diameter of 5.6 103 m. length/diameter 21 .8. and charge density 1. 0× 103kg/m4. The ordinary black and yellow top-surface clay arc used as the media, its cohesive coefficient is 2. 45×104Pa, angle of internal friction 23°28'. density 1.8×103kg/m3 and water content 15-16%.3. The media densities are regarded as functions of the Lagrangian coordinates, independent upon the time.B. Explosion model and constitutional relations:1. Effects of detonation products under high temperature and pressure in the media are described with the elastic-perfect-plastic model as in Fig.l.When the medium is under high pressure, the loading stress is far beyond its elastic limit in to a plastic state. So a reasonable function is selected to describe the plastic flow. In addition, the elastic precursor is considered simultaneousely.2. Constitutional relationsThe Mohr-coulomb friction failure relation:|τ|=C-σtgφwhere τ= maximum shear stress,σ= normal stress at tangential plane. φ=angle of internal friction. C=cohesion. is used to describe the yielding properties of the soil. Therefore, the yielding relation isf=|τ|-C+σtgφC. Results and conclusions:1.The particle velocity decreases exponentially with the increase of distance.2.The shock wave form passing fixed-point and the spatial distributions of the shock wave at various times all reflect the propagation characteristics of the shock wave. Besides, the decay behavior of the peak pressure is in accord with that of the experiment.3.The final dimension of the explosion cavity depends on the soil strength. When the cavity pressure is less than the soil strength, the expansion of the cavity stops immediately.4. The shock wave parameters and explosion cavity generated by the cylindrical charge explosion can be calculated rather correctly for some soils using the elastic-perfect-plastic model, but some factors, for example, free surface, charge shape, and the distribution of the charge weight and so on, are not considerd. There are some differences among the results of calculation and those obtained by the experiments.

本文用拉格朗日坐标有限差分法对条形装药土中爆炸的冲击波和空腔参数进行了一维轴对称数值模拟。计算中取爆破介质为弹-理想塑性体。计算得到的冲击波,爆炸空腔的参数与X光摄影数据的比较,结果表明计算与实测结果基本一致。

A nonlinear elasto-perfect plastic model of interface element is presented. The proposed model can simulate behavior of soil and structure interaction. The stress-strain relationship and nonlinear elasto-perfect plastic matrix of interface element are established based on elastoplasticity theory. The computational procedure for implementing this-type of nonlinear and inelastic interface element in the finite element methods is developed and numerical scheme is presented. Then the method...

A nonlinear elasto-perfect plastic model of interface element is presented. The proposed model can simulate behavior of soil and structure interaction. The stress-strain relationship and nonlinear elasto-perfect plastic matrix of interface element are established based on elastoplasticity theory. The computational procedure for implementing this-type of nonlinear and inelastic interface element in the finite element methods is developed and numerical scheme is presented. Then the method is applied to numerical analyses of foundation pit excavation. Through numerical computations for an example of the foundation pit excavation and bracing, the distributions of earth pressures behind and in the front of pile wall along the depth and their variations during the excavation of foundation pit are examined. It is indicated that the proposed model can rationally simulate the stress-strain relationship of interface element and will be practically applicable.

将非线性弹性理论与弹塑性理论相结合,对于土与结构间接触面提出了一种非线性弹性-理想塑性模型,用于模拟土与结构相互作用体系的变形与破坏机理。推导建立了这种接触面单元的应力-应变关系和弹塑性系数矩阵,并且讨论了这种模型在基坑开挖与支护分析应用中所面临的数值计算问题。最后针对某一基坑工程实例,应用这种接触面模型进行了数值计算与分析,结果表明,该模型能够较合理地模拟接触面上的变形机理与受力状态。

 
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