目的设计合理的抛光工艺方案,获得平整的阵列光纤组件端面。方法采用单因素实验法研究抛光工艺参数对阵列光纤表面粗糙度与光纤凸起量的影响,利用光学表面轮廓仪与扫描电镜进行分析与观察。结果在抛光液磨粒质量分数为2%,抛光液流量为15...目的设计合理的抛光工艺方案,获得平整的阵列光纤组件端面。方法采用单因素实验法研究抛光工艺参数对阵列光纤表面粗糙度与光纤凸起量的影响,利用光学表面轮廓仪与扫描电镜进行分析与观察。结果在抛光液磨粒质量分数为2%,抛光液流量为15 m L/min,抛光压力为50 k Pa,抛光盘转速为30 r/min的条件下,可以获得平整的阵列光纤组件端面。结论应用化学机械抛光技术加工阵列光纤组件,并设计合理工艺方案,可获得平整的阵列光纤组件端面,其表面粗糙度可低至42.6 nm,光纤凸起值可低至0.14μm。展开更多
Wrinkling is a common failure in the sheet metal forming of titanium owing to the relatively poor ability to shrink. It is important to predict wrinkling accurately in the sheet metal forming without costly trials. Th...Wrinkling is a common failure in the sheet metal forming of titanium owing to the relatively poor ability to shrink. It is important to predict wrinkling accurately in the sheet metal forming without costly trials. The ABAQUS/Explicit code was utilized to predict the wrinkling behavior in the sheet metal forming of Ti-15-3 alloy sheets. In terms of the comparison of wrinkling behavior between the simulation and experiment of the Fukui＇s conical cup tests at room temperature, the sensitivities of wrinkling simulation to various input parameters were evaluated comprehensively and quantitatively. Prediction of wrinkling and influence of rubber hardness on the winkling behavior in the rubber forming of convex flange were investigated quantitatively and validated by the rubber forming experiments. The excellent agreements between the simulations and the experiments conIirmed the accuracy of the prediction.展开更多
The influence of pile-up on the nanoindentation measurements in Cu 2wt.%Be samples with precipitates was carefully studied.The precipitates were formed by aging treatments for 1 h at different temperatures between 540...The influence of pile-up on the nanoindentation measurements in Cu 2wt.%Be samples with precipitates was carefully studied.The precipitates were formed by aging treatments for 1 h at different temperatures between 540 and 680 K.The load depth curves were analyzed using the classical Oliver and Pharr method,and the obtained elastic modulus and hardness were compared with values estimated by other techniques.An important level of pile-up was found in samples with precipitates and differences in the load depth curves were observed between the unaged and aged samples.A correction of the contact depth considering the pile-up proposed by Loubet was used for hardness estimation.For the determination of the elastic modulus,an approach based on the relation between the ratio of unloading work to indentation total work,with the ratio H/Er(H is the hardness;Er is the reduced modulus),was employed.A specific relation between both parameters was developed.展开更多
文摘目的设计合理的抛光工艺方案,获得平整的阵列光纤组件端面。方法采用单因素实验法研究抛光工艺参数对阵列光纤表面粗糙度与光纤凸起量的影响,利用光学表面轮廓仪与扫描电镜进行分析与观察。结果在抛光液磨粒质量分数为2%,抛光液流量为15 m L/min,抛光压力为50 k Pa,抛光盘转速为30 r/min的条件下,可以获得平整的阵列光纤组件端面。结论应用化学机械抛光技术加工阵列光纤组件,并设计合理工艺方案,可获得平整的阵列光纤组件端面,其表面粗糙度可低至42.6 nm,光纤凸起值可低至0.14μm。
文摘Wrinkling is a common failure in the sheet metal forming of titanium owing to the relatively poor ability to shrink. It is important to predict wrinkling accurately in the sheet metal forming without costly trials. The ABAQUS/Explicit code was utilized to predict the wrinkling behavior in the sheet metal forming of Ti-15-3 alloy sheets. In terms of the comparison of wrinkling behavior between the simulation and experiment of the Fukui＇s conical cup tests at room temperature, the sensitivities of wrinkling simulation to various input parameters were evaluated comprehensively and quantitatively. Prediction of wrinkling and influence of rubber hardness on the winkling behavior in the rubber forming of convex flange were investigated quantitatively and validated by the rubber forming experiments. The excellent agreements between the simulations and the experiments conIirmed the accuracy of the prediction.
基金supported by Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET)Comisión de Investigaciones Científicas de la Provincia de Buenos Aires (CICPBA)SECAT (UNCPBA) Argentina
文摘The influence of pile-up on the nanoindentation measurements in Cu 2wt.%Be samples with precipitates was carefully studied.The precipitates were formed by aging treatments for 1 h at different temperatures between 540 and 680 K.The load depth curves were analyzed using the classical Oliver and Pharr method,and the obtained elastic modulus and hardness were compared with values estimated by other techniques.An important level of pile-up was found in samples with precipitates and differences in the load depth curves were observed between the unaged and aged samples.A correction of the contact depth considering the pile-up proposed by Loubet was used for hardness estimation.For the determination of the elastic modulus,an approach based on the relation between the ratio of unloading work to indentation total work,with the ratio H/Er(H is the hardness;Er is the reduced modulus),was employed.A specific relation between both parameters was developed.
