基于声发射监测技术的非水反应高聚物受压损伤模型研究

Compression Damage Model of Nonwater Reaction Polymer Based on Acoustic Emission Monitoring Technology

为探究非水反应高聚物在上覆荷载作用下的抗压性能,对非水反应高聚物进行单轴抗压强度试验,探讨不同密度高聚物的破坏特征和强度,获得材料在压缩过程中的应力-应变曲线,通过声发射进一步了解高聚物破坏时的内部特征,得到表征高聚物损伤演化过程的声发射累计振铃次数曲线和损伤定位图。结果表明:1)非水反应高聚物压缩过程的声发射响应分为上升期、平静期和剧烈波动期3个阶段;2)高聚物密度越大,3个阶段的特征越明显,累计振铃次数越小;3)声发射监测破坏位置与数量和试件实际受压破坏吻合较好,因此,声发射技术可以较为精准地监测非水反应高聚物的受压破坏。最后,基于Weibull分布提出非水反应高聚物损伤模型,通过与试验结果对比表明,建立的损伤模型可以较好地反映非水反应高聚物抗压损伤演化过程。

To explore the compressive performance of nonwater reaction polymers under overlying load,uniaxial compressive strength test is conducted.The destruction characteristics and strength of polymer with different densities are discussed,and stress-strain curves of the material during compression are obtained.Acoustic emission is used to further investigate the failure of polymers′internal characteristics,with curves of cumulative acoustic emission events characterizing the evolution of polymers′damage and the damage location map.The results show the following:(1)The acoustic emission response of nonwater reaction polymer during compression can be divided into three stages,i.e.,rise,stable,and severe fluctuation periods.(2)The greater the density,the more evident are the three stages and the shorter are the cumulative ringing times.(3)The acoustic emission monitoring damage position and quantity agree well with the actual compression damage of the specimen,indicating that the acoustic emission technology can more accurately monitor the nonwater reaction polymer destruction under pressure.Finally,the damage model proposed based on Weibull random distribution can better reflect the damage evolution of the nonwater reaction polymer during compression.