Micromechanics-based elastic fields of closed-cell porous media
Micromechanics-based elastic fields of closed-cell porous media
复制标题
基于微力学的闭孔多孔介质弹性场
DOI：
--
复制
发表时间：
2018
期刊：
影响因子：
--
通讯作者：
Qingsheng Yang
中科院分区：
文献类型：
--
作者：
Lianhua Ma;Qingsheng Yang
流体填充的闭孔多孔介质可以表现出独特的特征，这些特征受到腔体内初始流体压力的影响。基于等效远场法，推导了饱和多孔介质局部弹性场的细观力学解。在本细观力学模型中，引入了三种不同的结构来表征闭孔多孔介质的不同状态。假设充液腔为剪切模量为零的可压缩弹性固体，封闭孔隙中的压力由流体域中引入的本征应变表示。在球形流体孔隙假设下，利用外点Eshelby张量导出了多孔介质固体基质中的局部应力场和应变场，该张量依赖于固体基质的泊松比和球形流体区域外所研究的材料点的位置。通过一个经典算例验证了弹性解析解的可靠性和准确性。此外，对于有限体积分数的流体包裹体，得到了多孔介质在初始流体压力和外载荷作用下的局部弹性场。结果表明，该细观力学模型为描述含闭孔流体孔隙材料的局部弹性场提供了一种有效的方法。
Fluid-filled closed-cell porous media could exhibit distinctive features which are influenced by initial fluid pressures inside the cavities. Based on the equivalent far-field method, micromechanics-based solutions for the local elastic fields of porous media saturated with pressurized fluid are formulated in this paper. In the present micromechanics model, three configurations are introduced to characterize the different state the closed-cell porous media. The fluid-filled cavity is assumed to be a compressible elastic solid with a zero shear modulus, and the pressures in closed pores are represented by eigenstrains introduced in fluid domains. With the assumption of spheroidal fluid-filled pores, the local stress and strain fields in solid matrix of porous media are derived by using the Exterior-Point Eshelby tensors, which are dependent of the Poisson's ratio of solid matrix and the locations of the investigated material points outside the spheroidal fluid domain. The reliability and accuracy of the analytical elastic solutions are verified by a classical example. Moreover, for finite volume fraction of the fluid inclusions, the local elastic fields of the porous media subjected to the initial fluid pressure and external load are obtained. The results show that the present micromechanics model provides an effective approach to characterize the local elastic fields of the materials with closed-cell fluid-filled pores.
登录
查看更多内容
影响因子：
2.4
作者：
Qingsheng Yang;W. Becker
通讯作者：
Qingsheng Yang;W. Becker
影响因子：
3.9
作者：
Ma, Lian-Hua;Yang, Qing-Sheng;Yan, Xiao-Hui;Qin, Qing-Hua
通讯作者：
Qin, Qing-Hua
影响因子：
9.8
作者：
Weixu Zhang;Weixu Zhang;Zhimin Xu;Tiejun Wang;Xiangshan Chen
通讯作者：
Weixu Zhang;Weixu Zhang;Zhimin Xu;Tiejun Wang;Xiangshan Chen
DOI：
10.3997/2214-4609.201410817
发表时间：
1991-05
期刊：
--
影响因子：
--
作者：
L. Thomsen
通讯作者：
L. Thomsen
影响因子：
9.4
作者：
M. Ozgur;R. Mullen;G. Welsch
通讯作者：
M. Ozgur;R. Mullen;G. Welsch