搜索结果: 1-15 共查到“知识库 计算固体力学”相关记录39条 . 查询时间(0.569 秒)
Stabilized low-order finite elements for frictional contact with the extended finite element method
Extended finite element Frictional contact Lagrange multipliers Penalty method Stabilized methods
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2015/7/1
Contact problem suffers from a numerical instability similar to that encountered in incompressible elasticity, in which the normal contact pressure exhibits spurious oscillation. This oscillation does...
A contact algorithm for frictional crack propagation with the extended finite element method
contact algorithm frictional crack extended finite element method
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2015/7/1
We present an incremental quasi-static contact algorithm for path-dependent frictional crack propagation in the framework of the extended finite element (FE) method. The discrete formulation allows fo...
Assumed enhanced strain and the extended finite element methods: A unification of concepts
Assumed enhanced strain Embedded strong discontinuity Extended finite element method Frictional crack
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2015/7/1
We present strong and weak forms of boundary-value problems for a solid with a cohesive–frictional crack. Two commonly used techniques for enhancing the finite element (FE) interpolation are considere...
Mechanical models of fracture reactivation and slip on bedding surfaces during folding of the asymmetric anticline at Sheep Mountain,Wyoming
Fold Fracture reactivation Bed parallel slip FEM modeling Frictional contact Sheep Mountain,Wyoming
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2015/7/1
We use finite element methods to investigate the reactivation of fractures (opening and shearing) and the development of bedding-surface slip during the deformation of the asymmetric anticline at Shee...
Quantifying sensitivity of local site response models to statistical variations in soil properties
Local site response Sensitivity analysis Statistical variation Stochastic analysis
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2015/7/1
We perform a combined stochastic-deterministic analysis of local site response using two computer codes, an equivalent linear analysis program SHAKE and a fully nonlinear finite element code SPECTRA. ...
Conditions for instabilities in collapsible solids including volume implosion and compaction banding
Compaction band Deformation band Material instability Volume implosion
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2015/7/1
We review conditions for material instabilities in porous solids induced by a bifurcation of solution into non-unique strain rate fields. Bifurcation modes considered include jumps in the strain rate ...
Finite element simulation of strain localization with large deformation: capturing strong discontinuity using a Petrov–Galerkin multiscale formulation
Finite element simulation strain localization with large deformation strong discontinuity Petrov–Galerkin multiscale formulation
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2015/7/1
The finite element model for strain localization analysis developed in a previous work is generalized to the finite deformation regime. Strain enhancements via jumps in the displacement field are capt...
Implicit J2-bounding surface plasticity using Prager’s translation rule
computational plasticity implicit integration bounding surface plasticity multiaxial behaviour
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2015/7/1
A bounding surface J2-plasticity model that uses Prager’s translation rule is presented. The model preserves Masing’s rules and is developed from the same ideas as classical innitesimal J2-plasticity...
一种带梯度惩罚项的离散力学最优控制方法
离散力学最优控制 梯度惩罚项 优化
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2015/9/2
离散力学最优控制方法(discrete mechanics and optimal control, DMOC) 是最新提出的一种有效的优化控制模型. 由于原始方法在求解优化问题时容易产生控制力的震荡,不利于控制力的稳定输出. 该文首先对产生这种数值现象的原因进行了简单的分析,并提出了可行的解决路径——加入惩罚梯度项. 最后采用数值算例对该方法进行验证,数值算例表明:改进的方法可以在保证力量最小化...
当建立多个模型对工程结构进行数值仿真时,为了得到更可靠的预测结果,需要综合考虑模型选择不确定性和模型形式不确定性对预测结果的影响. 联合贝叶斯方法与实验数据计算不同模型的可信度,采用调节因子方法传播模型选择不确定性得到系统响应置信区间,并叠加模型形式不确定性的影响获得综合模型计算结果的置信区间,再通过插值得到关心量在预测点的置信区间. 最后通过某飞行器气动力系数的预测推断检验了该方法的可行性.
基于Cooper理论和谐波叠加法计算随车移动点的脉动风速,分析不同风向角下脉动风速的功率谱密度特性。在横风下高速列车非定常气动载荷计算方法的基础上,建立了侧风下高速列车非定常气动载荷的计算方法,并用此方法分析了侧向随机风作用下非定常气动载荷的统计特性,给出了各气动载荷的峰值因子。研究表明,当风向角接近90°时, 无量纲功率谱会往高频移动,风向角对脉动风速的影响较小;在各个风向角下,气动载荷的标准差...
以最大升阻比为优化目标,在锥型流场中优化设计出乘波布局,并考虑高超声速飞行器的防热需求,对乘波布局进行钝化设计,利用数值模拟和风洞实验两种手段,研究钝化前缘乘波布局的气动特性.结果表明:在一定钝化半径内,随着钝化半径的增加,乘波构型的升力特性变化仅为2%,但阻力特性增加近3倍,升阻比降低了将近50%.尽管如此,为了钝化乘波布局,仍维持了较高的升阻比,升阻比为3左右.同时,以二维顶压式进气道为基础,...
基于双剪统一强度理论的复式钢管混凝土轴压承载力计算
复式钢管混凝土 双剪统一强度理论 轴压承载力 套箍约束
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2013/10/11
考虑内、外钢管对混凝土的双重约束作用, 分析复式钢管混凝土的轴压应力状态, 采用双剪统一强度理论分析混凝土和钢管各自的极限轴压强度, 得出复式钢管混凝土轴压承载力公式; 通过推导钢管在极限状态的强度折减系数及钢管与混凝土之间的紧箍力值, 计算出的轴压承载力与试验数据进行对比, 吻合较好, 验证了双剪统一强度理论在复式钢管混凝土轴压承载力计算中的适用性; 并给出了内圆钢管的径厚比和直径与轴压承载力提...
根据混凝土材料的细观组成和力学特性,研究了骨料几何形状和空间分布规律,建立全级配混凝土三维凸多面体随机细观模型,引入了混凝土细观组份材料的本构模型,分别模拟了单轴、双轴和三轴状态下混凝土的静态力学性能,并建立混凝土梁的三维宏细观分析模型,研究了三点弯曲梁的变形及裂缝扩展情况。结果表明,本文建立的细观力学模型的计算结果与实验数据吻合较好,可以较好地模拟各种复杂应力条件下混凝土的静态力学性能和损伤破坏...