Development of Anisotropy in Deformed Rocks

建议研究多矿岩石的韧性变形及其伴生的优选取向和各向异性。有限元方法将用于模拟亚微观内部尺度下晶体聚集体的变形，并将结果与解析上下限解进行比较。在此基础上，提出了塑性各向异性和非均质多矿岩石变形的本构方程。FEM方法也将用于模拟大型非均匀系统，如地幔对流，具有比初步试点研究更现实的几何和材料限制。在经典的各向同性对流研究中，每个元素将包含500个颗粒的集合，并根据应变相容性和应力平衡原则进行变形，而不是使用单一的黏度数字来描述材料的行为。这些基于多晶塑性概念的各向异性对流模型将有助于地球动力学和地震学理解弹性波各向异性的发展和解释。* * * *

Wenk 9417580 The proposal is to investigate ductile deformation of polymineralic rocks and accompanying development of preferred orientation and anisotropy. Finite element methods will be used to model deformation of crystal aggregates at the submicroscopic intragrain scale and compare results with analytical upper and lower bounds solutions. Based on results constitutive equations for deformation of plastically anisotropy and heterogeneous polymineralic rocks can be proposed. FEM methods will also be used to model large heterogeneous systems such as convection of the Earth's mantle, with more realistic geometry and material constraints than in a preliminary pilot study. Instead of using a single number for viscosity to describe the material behavior as is done in classical isotropic convection studies, each element will contain an assembly of 500 grains and deform according to principles of strain compatibility and stress equilibrium. These models of anisotropy convection based on polycrystal plasticity concepts will be useful for geodynamics and seismology to understand development and interpretation of anisotropy of elastic waves. ****