The rheological behavior of a low epoxy resin system-SR8100/SD8734 for RTM in aviation industry was studied with viscosity experiments. The dual-Arrhenius rheological model and the improved engineering viscosity model...The rheological behavior of a low epoxy resin system-SR8100/SD8734 for RTM in aviation industry was studied with viscosity experiments. The dual-Arrhenius rheological model and the improved engineering viscosity model were introduced and compared with the experimental data. The results indicated that the viscosity in the earlier stage calculated by dual-Arrhenius model matched the experimental data. As rising to 400 m.Pas, the viscosity calculated by the improved engineering model was closer to the experimental data. The processing windows of the resin system for RTM were determined by combining the two models, which could predict the theological behavior of the resin system in a more credible way. 30-45 ℃ was the optimum processing temperature.展开更多
Deep petroleum resources are in a high-temperature environment.However,the traditional deep rock coring method has no temperature preserved measures and ignores the effect of temperature on rock porosity and permeabil...Deep petroleum resources are in a high-temperature environment.However,the traditional deep rock coring method has no temperature preserved measures and ignores the effect of temperature on rock porosity and permeability,which will lead to the distortion of the petroleum resources reserves assessment.Therefore,the hollow glass microspheres/epoxy resin(HGM/EP)composites were innovatively proposed as temperature preserved materials for in-situ temperature-preserved coring(ITP-Coring),and the physical,mechanical,and temperature preserved properties were evaluated.The results indicated that:As the HGM content increased,the density and mechanical properties of the composites gradually decreased,while the water absorption was deficient without hydrostatic pressure.For composites with 50 vol%HGM,when the hydrostatic pressure reached 60 MPa,the water absorption was above 30.19%,and the physical and mechanical properties of composites were weakened.When the hydrostatic pressure was lower than 40 MPa,the mechanical properties and thermal conductivity of composites were almost unchanged.Therefore,the composites with 50 vol%HGM can be used for ITPCoring operations in deep environments with the highest hydrostatic pressure of 40 MPa.Finally,to further understand the temperature preserved performance of composites in practical applications,the temperature preserved properties were measured.An unsteady-state heat transfer model was established based on the test results,then the theoretical change of the core temperature during the coring process was obtained.The above tests results can provide a research basis for deep rock in-situ temperature preserved corer and support accurate assessment of deep petroleum reserves.展开更多
针对真空辅助树脂传递模塑(vacuum assisted resin transfer molding,VARTM)工艺成型玻纤/环氧树脂复合材料存在气泡、聚胶等问题,采用PAM-RTM软件对该复合材料的VARTM成型工艺进行模拟仿真。通过改变流道的设计方案,控制树脂黏度,观测...针对真空辅助树脂传递模塑(vacuum assisted resin transfer molding,VARTM)工艺成型玻纤/环氧树脂复合材料存在气泡、聚胶等问题,采用PAM-RTM软件对该复合材料的VARTM成型工艺进行模拟仿真。通过改变流道的设计方案,控制树脂黏度,观测充模过程中树脂的压力分布及充模时间,优化实验工艺,进而对模拟结果进行实验验证。结果表明:最佳注射方案是平行于Y轴一侧线性注入,另一侧线性排出。多线性注射虽然可以提高效率但是同时会出现交汇、聚胶等现象。充模时间随树脂黏度的增加而增加,随着充模过程的进行,黏度过高的树脂会发生部分固化,影响纤维的浸润。因此,树脂黏度控制在0.5 Pa·s左右较为合适。根据模拟优化结果,采用VARTM工艺分别制备2种典型的玻纤/环氧树脂复合材料。发现最佳注射方案,制备的复合材料表面光滑,无明显气泡、聚胶等缺陷,注射方案较好。展开更多
采用树脂传递模塑工艺制备了国产T700级碳纤维织物ZT7H3194U增强环氧树脂5284RTM复合材料层板。通过超声C扫描和显微分析法评价了层板的内部质量,研究了ZT7H3194U/5284RTM复合材料的吸湿特性,利用动态热力学分析评价了湿热老化对复合材...采用树脂传递模塑工艺制备了国产T700级碳纤维织物ZT7H3194U增强环氧树脂5284RTM复合材料层板。通过超声C扫描和显微分析法评价了层板的内部质量,研究了ZT7H3194U/5284RTM复合材料的吸湿特性,利用动态热力学分析评价了湿热老化对复合材料耐热性能的影响,研究了ZT7H3194U/5284RTM复合材料在室温干态及吸湿平衡后在高温条件下的力学性能。结果表明,所制备的复合材料层板内部质量良好。纤维体积分数为58%的ZT7H3194U/5284RTM复合材料的平衡吸湿率约为0.41%。随着湿热老化时间的延长,复合材料的玻璃化转变温度(Tg)及储能模量拐点温度(Tg m o d)均逐渐下降,并随着吸湿平衡而趋于平稳,达到平衡吸湿后,复合材料的Tg和Tg m o d仅分别下降了约7%和8%。吸湿平衡后的ZT7H3194U/5284RTM复合材料在高温条件下的力学性能保持率较高。综合湿热老化前后其耐热性能和力学性能的变化情况来看,ZT7H3194U/5284RTM复合材料具有良好的耐湿热性能。展开更多
基金Funded by the Freedom Explore Program of Central South University(No.721500254)the Hunan Provincial Innovation Foundation for Postgraduate(No.CX2012B052)
文摘The rheological behavior of a low epoxy resin system-SR8100/SD8734 for RTM in aviation industry was studied with viscosity experiments. The dual-Arrhenius rheological model and the improved engineering viscosity model were introduced and compared with the experimental data. The results indicated that the viscosity in the earlier stage calculated by dual-Arrhenius model matched the experimental data. As rising to 400 m.Pas, the viscosity calculated by the improved engineering model was closer to the experimental data. The processing windows of the resin system for RTM were determined by combining the two models, which could predict the theological behavior of the resin system in a more credible way. 30-45 ℃ was the optimum processing temperature.
基金National Natural Science Foundation of China(grant number 51827901)funded by the Program for Guangdong Introducing Innovative and Enterpreneurial Teams(No.2019ZT08G315)Shenzhen Basic Research Program(General Program)(No.JCYJ20190808153416970)
文摘Deep petroleum resources are in a high-temperature environment.However,the traditional deep rock coring method has no temperature preserved measures and ignores the effect of temperature on rock porosity and permeability,which will lead to the distortion of the petroleum resources reserves assessment.Therefore,the hollow glass microspheres/epoxy resin(HGM/EP)composites were innovatively proposed as temperature preserved materials for in-situ temperature-preserved coring(ITP-Coring),and the physical,mechanical,and temperature preserved properties were evaluated.The results indicated that:As the HGM content increased,the density and mechanical properties of the composites gradually decreased,while the water absorption was deficient without hydrostatic pressure.For composites with 50 vol%HGM,when the hydrostatic pressure reached 60 MPa,the water absorption was above 30.19%,and the physical and mechanical properties of composites were weakened.When the hydrostatic pressure was lower than 40 MPa,the mechanical properties and thermal conductivity of composites were almost unchanged.Therefore,the composites with 50 vol%HGM can be used for ITPCoring operations in deep environments with the highest hydrostatic pressure of 40 MPa.Finally,to further understand the temperature preserved performance of composites in practical applications,the temperature preserved properties were measured.An unsteady-state heat transfer model was established based on the test results,then the theoretical change of the core temperature during the coring process was obtained.The above tests results can provide a research basis for deep rock in-situ temperature preserved corer and support accurate assessment of deep petroleum reserves.
文摘采用树脂传递模塑工艺制备了国产T700级碳纤维织物ZT7H3194U增强环氧树脂5284RTM复合材料层板。通过超声C扫描和显微分析法评价了层板的内部质量,研究了ZT7H3194U/5284RTM复合材料的吸湿特性,利用动态热力学分析评价了湿热老化对复合材料耐热性能的影响,研究了ZT7H3194U/5284RTM复合材料在室温干态及吸湿平衡后在高温条件下的力学性能。结果表明,所制备的复合材料层板内部质量良好。纤维体积分数为58%的ZT7H3194U/5284RTM复合材料的平衡吸湿率约为0.41%。随着湿热老化时间的延长,复合材料的玻璃化转变温度(Tg)及储能模量拐点温度(Tg m o d)均逐渐下降,并随着吸湿平衡而趋于平稳,达到平衡吸湿后,复合材料的Tg和Tg m o d仅分别下降了约7%和8%。吸湿平衡后的ZT7H3194U/5284RTM复合材料在高温条件下的力学性能保持率较高。综合湿热老化前后其耐热性能和力学性能的变化情况来看,ZT7H3194U/5284RTM复合材料具有良好的耐湿热性能。
