搜索结果: 1-15 共查到“知识库 塑性力学”相关记录194条 . 查询时间(7.183 秒)
基于虚功原理建立套管外挤力学模型
虚功原理 侧向载荷 塑性变形 菲涅尔积分
2016/11/1
为了准确地描述侧向载荷作用下套管发生挤毁变形，假设在发生塑性变形时套管的受力变形区形状为对称的两个弧形，基于虚功原理建立侧向载荷作用下的套管损坏力学平衡关系，引入菲涅耳积分推导出套管损坏力学模型.并结合大庆油田工程实际进行了套管挤毁实验，得出新公式的平均相对误差远远小于API公式的平均相对误差，从能量角度出发，为研究在外挤载荷下套管挤毁变形提供新的研究方法，为以后研究相关设计提供参考.
双层组合厚壁圆筒弹脆塑性极限内压统一解
三剪统一强度准则 弹脆塑性模型 脆性软化
2015/11/6
基于三剪统一强度准则和弹脆塑性软化模型,考虑材料的脆性软化和中间主应力效应,推导了双层组合厚壁圆筒弹脆塑性极限内压统一解,探讨了粘聚力、内摩擦角、半径比、强度理论参数和中间主应力系数的影响特性,克服了以往基于Tresca屈服准则、Mises屈服准则或双剪强度理论的理想弹塑性解的不足。研究结果表明：中间主应力、材料模型和脆性软化对厚壁圆筒的极限内压均有显著影响。该文所得统一解具有广泛的适用性和理论意...
Extended finite element framework for fault rupture dynamics including bulk plasticity
extended finite elements fault rupture dynamics bulk plasticity
2015/7/1
We present an explicit extended finite element framework for fault rupture dynamics accommodating bulk plasticity near the fault. The technique is more robust than the standard split-node method becau...
Discrete micromechanics of elastoplastic crystals in the finite deformation range
Crystal plasticity Finite deformation Micromechanics Stress-point integration Strong discontinuity
2015/7/1
We present a rate-independent crystal plasticity theory in the finite deformation range. The formulation revolves around theory of distribution and strong discontinuity concepts applied to the slip sy...
Micropolar hypoplasticity for persistent shear band in heterogeneous granular materials
Finite elements Heterogeneity Hypoplasticity Micropolar theory Persistent shear band
2015/7/1
Persistent shear bands in heterogeneous materials develop progressively, rather than instantaneously. For a meaningful capture of this deformation pattern, the band must develop naturally and freely u...
On the pore-scale mechanisms leading to brittle and ductile deformation behavior of crystalline rocks
crystal plasticity deformation mechanisms finite element heterogeneity microfracture
2015/7/1
Deformation mechanisms at the pore scale are responsible for producing large strains in porous rocks. They include cataclastic flow, dislocation creep, dynamic recrystallization, diffusive mass transf...
Computational Aspects of Elasto-Plastic Deformation in Polycrystalline Solids
Computational Aspects Elasto-Plastic Deformation Polycrystalline Solids
2015/7/1
The overall elasto-plastic behavior of single crystals is governed by individual slips on crystallographic planes, which occur when the resolved shear stress on a critical slip system reaches a certai...
An extended finite element framework for slow-rate frictional faulting with bulk plasticity and variable friction
extended finite element friction fault plasticity
2015/7/1
We present an extended finite element (FE) approach for the simulation of slow-rate frictional faulting in geologic media incorporating bulk plasticity and variable friction. The method allows the fau...
Cam-Clay plasticity. Part V: A mathematical framework for three-phase deformation and strain localization analyses of partially saturated porous media
Cam-Clay plasticity
2015/7/1
We present a mathematical framework for deformation and strain localization analyses of partially saturated granular media using three-phase continuum mixture theory. First, we develop conservation la...
Critical state plasticity. Part VI:Meso-scale finite element simulation of strain localization in discrete granular materials
Granular materials Strain localization
2015/7/1
Development of more accurate mathematical models of discrete granular material behavior requires a fundamental understanding of deformation and strain localization phenomena. This paper utilizes a mes...
On the numerical integration of three-invariant elastoplastic constitutive models
the numerical integration three-invariant elastoplastic constitutive models
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 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
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
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...