搜索结果: 151-165 共查到“知识库 固体力学”相关记录2082条 . 查询时间(6.575 秒)
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...
Bifurcation of elastoplastic solids to shear band mode at finite strain
Bifurcation Elastoplastic solids Shear bond mode Finite strain
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2015/7/1
This paper formulates and implements a finite deformation theory of bifurcation of elastoplastic solids to planar bands within the framework of multiplicative plasticity. Conditions for the onset of s...
On the numerical integration of three-invariant elastoplastic constitutive models
the numerical integration three-invariant elastoplastic constitutive models
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2015/7/1
We investigate the performance of a numerical algorithm for the integration of isotropically hardening three-invariant elastoplastic constitutive models with convex yield surfaces. The algorithm is ba...
A fully nonlinear finite-element (FE) model is developed to investigate the impact of hysteretic and viscous material behavior on the downhole motion recorded by an array at a large-scale seismic test...
A 3D finite-element model is developed to study soil-structure interaction (SSI) effects at a LargeScale Seismic Test (LSST) site in Lotung, Taiwan, during the earthquake of May 20, 1986. Analyses are...
A finite element model of localized deformation in frictional materials taking a strong discontinuity approach
finite element model localized deformation frictional materials strong discontinuity approach
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2015/7/1
A finite element model of localized deformation in frictional materials taking a strong discontinuity approach is presented. A rate-independent, non-associated, strain-softening Drucker-Prager plastic...
A finite element model for strain localization analysis of strongly discontinuous fields based on standard Galerkin approximation
finite element model strongly discontinuous fields standard Galerkin approximation
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2015/7/1
This paper presents a fnite element model for strain localization analysis of elastoplastic solids subjected to discontinuous displacement felds based on standard Galerkin approximation. Strain enhanc...
竖向动载荷作用下平面框架结构水平动力响应分析
固定旋转机械 水平位移 结构固有频率 线刚度比
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2016/4/18
固定旋转机械引起的结构振动及其减、隔振控制是设备减、隔振领域一个十分重要的研究课题.以往的研究主要关注结构的竖向振动,而结构水平向振动往往被忽略.论文以设置有固定旋转设备的单层框架结构为例,分析了结构水平和竖向动位移幅值与结构固有频率、设备安装位置及设备运转频率之间的关系.研究结果表明,在特定条件下,结构水平向振动响应可能大于竖向振动响应,这一现象在设计时应引起足够的重视.
带有姿态的绳系航天器混沌运动实验研究
绳系航天器 动力学相似 物理仿真 混沌运动
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2018/12/28
利用地面物理仿真平台研究了绳系航天器的混沌动力学行为. 首先, 根据天地动力学相似原理, 通过对卫星仿真器施加喷气力和动量轮力矩来模拟空间动力学环境, 提出了两种等效方案, 给出了它们各自适用的实验工况. 数值结果表明, 在轨绳系航天器在一定的参数条件下系绳摆动为周期或概周期运动、航天器姿态发生混沌运动. 物理仿真验证了等效方案的有效性, 揭示了绳系航天器的混沌运动特征, 表明在阻尼力矩的作用下可...
考虑载荷特性的骨重建力学调控机制
力学调控机制 载荷特性 强度设计
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2015/5/13
骨组织具有适应变化力学环境的能力.通过分析骨组织适应力学环境的调控机制,吸纳工程强度设计准则思想,提出考虑载荷特性的骨重建力学调控机制,探讨载荷特性对力学激励的影响,对牙槽骨“张力区骨增生和压力区骨吸收”的现象进行分析和数值模拟.结果表明考虑载荷特性的骨重建力学调控机制是合理的,是骨重建力学调控机制理论的补充和完善.
贝壳Ⅱ:从神话到科学话尺度分级嵌套
贝壳 分级结构 裂纹分型扩展 强韧化机理
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2015/9/2
从嵌套的鬼神小说到嵌套的俄罗斯玩偶,再到嵌套分级的贝壳微结构,奇幻瑰丽的神话与奇妙真实的科学通过异想天开的想象之桥相连. 贝壳的嵌套微结构使外力打击所萌生的裂纹沿嵌套的之字形路径传播,从而大大增加了裂纹扩展路径,扩大了所消耗的能量,为脆性材料的强韧化开辟了新途径.
新型让压锚杆作用机理研究
软岩大变形 压力分散型 作用机理
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2015/5/13
软岩大变形工程存在因开挖卸荷导致较大的应力释放,在工程施工过程中将会产生较大变形的特点,如沿用传统的锚杆进行支护,岩体的大变形所产生的过大拉力将会造成锚杆的拉断破坏.针对软岩大变形工程存在的该类问题,介绍了一种新型的端部具有让压装置的新型压力分散型让压锚杆,并对该让压锚杆的作用机理和力学行为进行分析,得出锚固体的作用机理与传统压力分散型锚杆相比分为3个阶段,并通过试验的方式确定了该让压锚杆的让压力...