Composite Eshelby model and domain band geometries of ferroelectric ceramics

A method of composite Eshelby inclusion is proposed for a ferroelectric grain with domain switching embedded in a polycrystalline ferroelectric matrix. The method quantifies the twinning structure due to spontaneous polarization, as well as the conventional and non-conventional domain structures after poling induced domain reorientation of 90 degree. The predicted parameters include the volume fraction, the thickness, and the surface inclination angle of switched domain plates. The domain wall energy for non-conventional domain structures is derived in terms of the arrays of misfit dislocations. The domain geometries predicted by the present work agree with the measured domain morphology near an indentation crack tip when subjected to lateral electric field.     

强采动影响下煤层大巷二次支护方案研究

郭庄煤矿一采区胶带巷在两侧工作面回采结束后,受采动影响巷道出现变形影响后期使用,在原支护参数基础上提出两种不同二次支护方案,通过数值计算对比分析确定了最优方案,现场应用后矿压观测表明效果良好,很好地解决了强采动影响下煤层大巷二次支护这一难题。