玄武岩纤维增强地质聚合物混凝土的动态本构模型

以矿渣与粉煤灰为原材料制备玄武岩纤维增强地质聚合物混凝土(BFRGC),采用φ100mm分离式霍普金森压杆(SHPB)装置对BFRGC进行了冲击压缩试验,并对SHPB试验过程中的波形整形技术展开了研究,以此来提高材料SHPB试验的精度。通过SHPB试验,获得了BFRGC在10s-1―102s-1应变率范围内的应力-应变曲线,分析了BFRGC的强度和变形性能,并建立了BFRGC的率型非线性粘弹性本构模型。通过试验对模型进行验证,模型曲线与试验曲线吻合良好,该文建立的率型本构模型可以较为准确地描述BFRGC的动态力学行为。

DYNAMIC CONSTITUTIVE MODEL OF BASALT FIBER REINFORCED GEOPOLYMERIC CONCRETE

Slag and fly ash were used as raw materials to produce basalt fiber reinforced geopolymeric concrete (BFRGC).Impact compressive tests on BFRGC of various fiber volume fractions were carried out using a 100mm-diameter split Hopkinson pressure bar (SHPB).For the valid SHPB tests on BFRGC specimens,the improved pulse shaping techniques were introduced.Stress versus strain curves of BFRGC at 10s?1―102s?1 were obtained through SHPB tests.The strength and deformation of BFRGC were analyzed,and a nonlinear viscoelastic constitutive model was established.A comparison between model results and experimental data indicates that the dynamic constitutive model can describe BFRGC’s dynamic behaviors.