煤样破坏应变局部化与表面电位分布规律研究

Study on strain localization and surface potential distribution law of coal samples fracturing

为研究煤样表面电位分布与破坏局部化之间的关系,进行了煤样受载应变场及表面电位分布规律的测试,研究分析了表面电位场与煤样应变局部化和煤样破坏的对应关系。结果表明,煤样变形破坏过程中表现出明显的应变局部化特征,应变局部化集中区域是煤样损伤和破坏剧烈区域,应变局部化带往往是煤样出现破坏的位置。煤样变形破坏的表面电位场具有与应变场相似的分布特征,在损伤局部化区域表面电位场也具有集中化特征,煤样表面电位高、低电位点的连线反映了煤样的断裂面位置。

In order to study the relationship between surface potential distribution and destruction localization of the coal sample,the distribution law of strain field and surface potential of coal samples were tested under load.The relationship between surface potential field and strain localization fracture of coal samples was studied and analyzed.Results show that the coal samples show obvious strain localization characteristics in deformation and failure process,the strain localization concentrated area is the severe damage and fracture part of coal samples,and the strain localization zones is usually the fracture location of coal samples.The distribution character of surface potential field of coal samples during deformation and fracture is similar to the strain field,the potential field will be centralized in the damage localization area,the connection between the points of high potential and low potential reflects the rupture section of coal samples.