石墨混凝土应变与电导率关系的理论分析

从导电机理、比拟法及损伤三方面探讨了石墨混凝土棱柱体试件轴心受压全过程试验·分析了实测的混凝土试件变形模量应变关系上升及下降的走势与电导率应变关系走势相一致的原因·在有损伤的情况下,由于力场与电场均符合拉普拉斯方程,试件力场与电场的边界条件也一致,所以在石墨混凝土试件受荷全过程中电场力场可以相互比拟,即试验验证了比拟法的正确性·电导率这个材料的本征量与变形模量一样,可以很好地反映材料的损伤状况及破坏过程·

Theoretical Analysis of Relation Between Strain and Electrical Conductivity of Graphite Concrete

Discusses the conduction mechanism of prism-shaped graphite concrete in view of the whole process of an axial loading test, as well as the method of analogy and damage to the concrete. Analyzes the reasons why the up-and-down trend as shown on the deformation modulus-strain relation curve conforms to that as shown on the conductivity-strain curve. In case a specimen is damaged, its electric field and force field both comply with Laplace equation, and their boundary conditions are also in accord with each other. It means that it is possible to draw an analogy between the two fields in the whole loading test process of the graphite concrete samples, i.e., the correctness of such an analogy is verified by the test. Like the deformation modulus, the electrical conductivity is such an eigenvalue of a material that will characterize well the damage and rupture process.