Creep damage modeling based on ultrasonic velocities in copper
Creep damage modeling based on ultrasonic velocities in copper
复制标题
基于铜中超声波速度的蠕变损伤建模
DOI：
10.1016/s0020-7683(96)00110-2
复制
发表时间：
1997
影响因子：
3.6
通讯作者：
M. Hirao
中科院分区：
文献类型：
--
作者：
T. Morishita;M. Hirao
我们测量了纯铜试样在晶间蠕变过程中的声速和孔隙率。随着蠕变的进行，超声波速度减小，各向异性增强。我们研究了一个双复合材料模型隐含的显微摄影观察和计算横观各向同性的有效刚度。在该模型中，球形空洞均匀分布在扁椭球体单元内。这些椭球体随机嵌入在各向同性铜基体中，其短轴围绕应力方向呈轴对称分布。将未扰动速度、孔隙率和椭球体纵横比纳入建模计算提供了损伤形态的基本特征：空隙体积分数（在椭球体中）和取向分布函数（ODF）的最低阶展开系数。计算的速度和测量的速度之间的比较是相当令人满意的，表明这种微力学模型的有效性。
We measured the ultrasonic velocities and the porosity for pure copper samples subjected to the intergranular creep process. The ultrasonic velocities decreased and their anisotropy developed as the creep advanced. We study a double composite model implied by photomicrographic observations and calculated the transversely isotropic effective stiffness. In this model, spherical voids are uniformly distributed within oblate ellipsoidal volume elements. These ellipsoids are randomly embedded in an isotropic copper matrix with an axisymmetrical distribution of the minor axes around the stress direction. Incorporation of the unperturbed velocities, the porosity, and the ellipsoid aspect ratio into the modeling calculation provides the basis features of the damage morphology: the void volume fraction (in the ellipsoids) and the lowest-order expansion coefficients of the orientation distribution function (ODF). Comparison between the calculated and measured velocities was quite satisfactory, showing the validity of this micromechanical modeling.
影响因子：
4.5
作者：
J. Bussière
通讯作者：
J. Bussière