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不锈钢弯曲应力中性层偏移模型构建与实验研究 被引量:1
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作者 赵月伟 帅美荣 +5 位作者 楚志兵 拓雷锋 赵晓东 高虹 邬莉华 翟丽丽 《塑性工程学报》 CAS CSCD 北大核心 2023年第8期210-217,共8页
为实现不锈钢产品的精密成形,基于双线性硬化本构模型和弹塑性变形理论,采用分层理论,应用经典力学建立了316L不锈钢板料的“V”型弯曲应力中性层偏移模型。结合有限元模拟分析及三点弯曲实验研究结果,分析了关键工艺参数(弯曲半径和板... 为实现不锈钢产品的精密成形,基于双线性硬化本构模型和弹塑性变形理论,采用分层理论,应用经典力学建立了316L不锈钢板料的“V”型弯曲应力中性层偏移模型。结合有限元模拟分析及三点弯曲实验研究结果,分析了关键工艺参数(弯曲半径和板厚)对应力中性层偏移的耦合影响规律,并通过建立二元二次响应面方程对构建模型中的修正系数进行了优化,优化后模型的计算精度显著提升,与实验值和模拟值之间的最大偏差不大于4.76%,为模具优化设计和板料精确选型提供了理论基础。 展开更多
关键词 “V”型弯曲 应力中性偏移模型 响应面优化 实验研究
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塑料注射成形过程仿真软件的开发和应用 被引量:10
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作者 李德群 周华民 《中国机械工程》 EI CAS CSCD 北大核心 2002年第22期1894-1896,共3页
智能型 3维注射成形过程仿真系统 HSCAE3D解决了用 3维实体 /表面模型取代中性层模型的关键性技术难题 ,通过数值计算与人工智能技术的结合 ,使仿真软件由传统的被动式计算工具提升为主动式优化系统。实验和实践证明 ,HSCAE3D为注塑制... 智能型 3维注射成形过程仿真系统 HSCAE3D解决了用 3维实体 /表面模型取代中性层模型的关键性技术难题 ,通过数值计算与人工智能技术的结合 ,使仿真软件由传统的被动式计算工具提升为主动式优化系统。实验和实践证明 ,HSCAE3D为注塑制品与模具的虚拟制造奠定了坚实的理论和技术基础 ,构成了注塑制品成形质量全面控制的核心技术 。 展开更多
关键词 注射成形 中性层模型 实体/表面模型 塑料 仿真软件
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Nonlinear analysis of pile load-settlement behavior in layered soil
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作者 吕述晖 王奎华 +1 位作者 张鹏 C.J.LEO 《Journal of Central South University》 SCIE EI CAS CSCD 2015年第9期3615-3623,共9页
A simplified approach is presented to analyze the single pile settlement in multilayered soil. First, a fictitious soil-pile model is employed to consider the effect of layered soil beneath pile toe on pile settlement... A simplified approach is presented to analyze the single pile settlement in multilayered soil. First, a fictitious soil-pile model is employed to consider the effect of layered soil beneath pile toe on pile settlement behavior. Two approximation methods are proposed to simplify the nonlinear load transfer function and simulate the nonlinear compression of fictitious soil-pile, respectively. On this basis, an efficient program is developed. The procedures for determining the main parameters of mathematical model are discussed. Comparisons with two well-documented field experimental pile loading tests are conducted to verify the rationality of the present method. Further studies are also made to evaluate the practicability of the proposed approach when a soft substratum exists, and the results suggest that the proposed method can provide a constructive means for assessing the settlement of a single pile for use in engineering design. 展开更多
关键词 PILE load-settlement behavior fictitious soil-pile layered soil soft substratum SEDIMENT
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Experimental Survey on Dry Asphalt Rubber Concrete for Sub-ballast Layers
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作者 Gaetano Di Mino Ciro Maurizio Di Liberto 《Journal of Civil Engineering and Architecture》 2012年第12期1615-1626,共12页
This paper presents the results of an experimental survey on the potential application of DARC (dry asphalt rubber concrete) in rail superstructure, within sub-ballast layers by measuring its damping and mechanical ... This paper presents the results of an experimental survey on the potential application of DARC (dry asphalt rubber concrete) in rail superstructure, within sub-ballast layers by measuring its damping and mechanical properties. Based on the environmental friendly point of view the DARC has the significant advantage as the backfill material of sub-ballast layer because the rubber comes from the waste tires of truck and its usage can results a significant recycling of non-biodegradable wastes. After a preliminary mix-design of several DARCs, with different rubber content that confirmed by using the Marshall test, the stiffness modulus and damping ratio both of a standard bituminous mixture and of dry asphalt rubber concrete with a rubber content equal to 1.5% were determined using the four points bending device. The experimental results were compared and a numerical analysis by means of a 2D lumped mass model was developed in order to evaluate the different performance within the rail superstructure in terms both of the deflection and of the pressure on sub-grade. Both the results on the mechanical and dissipative properties of the DARC and the mechanical behavior of the correlate rail superstructure encourage the authors to continue the research on the application of such material for sub-ballast layers. 展开更多
关键词 DAMPING stiffness modulus dry asphalt rubber concrete sub-ballast layers.
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The Effect of IMF-Bz and F10.7 Solar Flux on Neutral Molecule Density of Ionospheric E-Region
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作者 Ramazan Atici Serhat Korlaelci 《Journal of Physical Science and Application》 2017年第3期66-70,共5页
In this study, the relationship between the neutral components (N2 and 02) in the E-region of the ionosphere (at 110 km altitude) for the Singapore (01.23 N; 103.55 E) station in the equatorial region and the FI... In this study, the relationship between the neutral components (N2 and 02) in the E-region of the ionosphere (at 110 km altitude) for the Singapore (01.23 N; 103.55 E) station in the equatorial region and the FI0.7 solar flux and z-component of Interplanetary Magnetic Field (IMF-Bz) was investigated. This relationship was determined by means of statistical multiple regression model. As a result, it was observed that the changes in F10.7 solar flux and IMF-Bz were inversely proportional to the changes in N2 and 02. 92% and 83% of changes in N2 and O2 were found to be explained by F10.7 solar flux and IMF-Bz, respectively. When the F10.7 solar flux is changed by 1 s.f.u., it causes a decrease of 2.61×10TM m-3 in N2 and 2.96×1014 m-3 in O2. Change of I nT in IMF-Bz causes a decrease of 9.95× 1015 m-3 in N2 and 1.69× 1015 m-3 in O2. 展开更多
关键词 Dynamo region F10.7 solar flux IMF-Bz ionospheric-E-region neutral density.
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