采用Minitab软件对千吨级对位芳纶生产中聚合物比浓对数黏度对纤维断裂强度的影响进行分析。首先,对聚合物比浓对数黏度和纤维断裂强度的测量系统进行验证,得出测量系统的变异影响都是在可接受的范围;然后采集生产现场数据对聚合物比浓...采用Minitab软件对千吨级对位芳纶生产中聚合物比浓对数黏度对纤维断裂强度的影响进行分析。首先,对聚合物比浓对数黏度和纤维断裂强度的测量系统进行验证,得出测量系统的变异影响都是在可接受的范围;然后采集生产现场数据对聚合物比浓对数黏度对纤维断裂强度和纺丝成纤率的影响进行分析,得出纤维断裂强度和纺丝成纤率随着聚合物比浓对数黏度的增大而增大,但当聚合物比浓对数黏度达到一定值后成纤率下降,并找出了聚合物比浓对数黏度较佳控制范围为6.3-7.0 d L/g。展开更多
本文采用国产YM065SXW电子束纤维强力机(等速伸长型CRE)与国产Y162A束纤维强力机(等速牵引型CRT)进行苎麻精干麻束纤维断裂强度测试的对比试验,并对试验结果进行统计分析。分析结果表明,在标准大气试验环境条件下,YM065SXW电子束纤维强...本文采用国产YM065SXW电子束纤维强力机(等速伸长型CRE)与国产Y162A束纤维强力机(等速牵引型CRT)进行苎麻精干麻束纤维断裂强度测试的对比试验,并对试验结果进行统计分析。分析结果表明,在标准大气试验环境条件下,YM065SXW电子束纤维强力机测试的平均强力值比Y162A束纤维强力机大0.23 c N/dtex,对比试验结果有显著性差异。展开更多
The reflected optical caustics method is applied to study dynamic fracture problems in hardened cement paste. First both the unreinforced cement paste and the glass fibres reinforced cement paste specimens were fabric...The reflected optical caustics method is applied to study dynamic fracture problems in hardened cement paste. First both the unreinforced cement paste and the glass fibres reinforced cement paste specimens were fabricated and the reflective coating on the surface of the specimen was prepared. Secondly the crack path and the shadow spot patterns during the crack propagation process for the two specimens were recorded by using a multi-spark high speed camera.Thirdly some dynamic parameters of two cement paste specimens including crack onset time the dynamic stress intensity factor and crack growth velocity were determined and analyzed comparatively.This indicates that the glass fibres can improve the fracture resistance and delay fracture time.These results will play an important role in evaluating the dynamic fracture properties of cement paste.展开更多
文摘采用Minitab软件对千吨级对位芳纶生产中聚合物比浓对数黏度对纤维断裂强度的影响进行分析。首先,对聚合物比浓对数黏度和纤维断裂强度的测量系统进行验证,得出测量系统的变异影响都是在可接受的范围;然后采集生产现场数据对聚合物比浓对数黏度对纤维断裂强度和纺丝成纤率的影响进行分析,得出纤维断裂强度和纺丝成纤率随着聚合物比浓对数黏度的增大而增大,但当聚合物比浓对数黏度达到一定值后成纤率下降,并找出了聚合物比浓对数黏度较佳控制范围为6.3-7.0 d L/g。
文摘本文采用国产YM065SXW电子束纤维强力机(等速伸长型CRE)与国产Y162A束纤维强力机(等速牵引型CRT)进行苎麻精干麻束纤维断裂强度测试的对比试验,并对试验结果进行统计分析。分析结果表明,在标准大气试验环境条件下,YM065SXW电子束纤维强力机测试的平均强力值比Y162A束纤维强力机大0.23 c N/dtex,对比试验结果有显著性差异。
基金The Ph.D.Programs Foundation of Ministry of Education of China(No.20120023120020)the National Natural Science Foundation of China(No.51404273)
文摘The reflected optical caustics method is applied to study dynamic fracture problems in hardened cement paste. First both the unreinforced cement paste and the glass fibres reinforced cement paste specimens were fabricated and the reflective coating on the surface of the specimen was prepared. Secondly the crack path and the shadow spot patterns during the crack propagation process for the two specimens were recorded by using a multi-spark high speed camera.Thirdly some dynamic parameters of two cement paste specimens including crack onset time the dynamic stress intensity factor and crack growth velocity were determined and analyzed comparatively.This indicates that the glass fibres can improve the fracture resistance and delay fracture time.These results will play an important role in evaluating the dynamic fracture properties of cement paste.
