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高墩大跨度变截面连续刚构预应力桥施工监测 被引量:6
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作者 樊云龙 李亮 王立中 《路基工程》 北大核心 2008年第3期138-139,共2页
以吉首连续刚构桥工程为例,介绍了预应力高墩大跨连续刚构桥施工监控的内容、主梁应力和形变监控的测试方法以及数据处理方法,使理论计算与施工紧密结合,确保了最后桥梁的实际状态达到设计期望的状态。
关键词 连续刚构 施工监控 应力和形变 实际状态
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应力对双极型晶体管参数性能的影响
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作者 郦扬成 《半导体技术》 CAS CSCD 北大核心 2009年第8期751-754,共4页
半导体器件和集成电路中存在着两大类应力,提出了应力及其引起的二次缺陷产生的原因、以及如何减小产生的应力和减少二次缺陷的措施,分析了应力和二次缺陷对双极型晶体管的参数性能的不同影响,以及如何区分产生的这些影响是由何种应力... 半导体器件和集成电路中存在着两大类应力,提出了应力及其引起的二次缺陷产生的原因、以及如何减小产生的应力和减少二次缺陷的措施,分析了应力和二次缺陷对双极型晶体管的参数性能的不同影响,以及如何区分产生的这些影响是由何种应力或二次缺陷引起的办法。指出硅片在高温氧化扩散后的科学的慢降温和低温出炉是减小应力和减少二次缺陷的最主要措施,对提高器件参数性能的水平和一致性、提高合格率等起着很重要的作用。 展开更多
关键词 应力和形变 二次缺陷 慢速降温
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带制动盘车轮的加工工艺改进和夹具设计
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作者 孙文新 孙允冬 《机车车辆工艺》 2023年第1期39-41,共3页
针对立式车床加工带制动盘车轮踏面加工工艺存在的问题,进行工艺分析优化,应用有限元分析夹具的应力和形变,制订夹具设计方案。
关键词 带制动盘车轮 踏面加工 有限元分析 应力和形变
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Stress and deformation due to embankment widening with different treatment techniques 被引量:3
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作者 汪浩 黄晓明 《Journal of Central South University》 SCIE EI CAS 2011年第4期1304-1310,共7页
A two-dimensional(2-D) finite element(FE) model was developed to analyze the deformation and stress of embankment on soft ground due to widening with different treatment techniques.It is found that the embankment wide... A two-dimensional(2-D) finite element(FE) model was developed to analyze the deformation and stress of embankment on soft ground due to widening with different treatment techniques.It is found that the embankment widening induces transverse gradient change due to differential settlements and horizontal outward movements at the shoulder of the existing embankment.Embankment widening also increases the shear stress along the slope of the existing embankment,especially at the foot of slope.The failure potential due to embankment widening may increase with the increase of widening width when the widening width is smaller than 8.5 m,but may decrease with the increase of widening width as the widening width is greater than 8.5 m.The effectiveness of four ground and embankment treatment techniques,including geosynthetic reinforcement,light-weight embankment,deep mixed columns,and separating wall were compared.The results indicate that these treatments reduce the differential settlements and improve the stability.The light-weight embankment has the most effectiveness among four treatments.By using the fly-ash backfill material in widening,the transverse gradient change decreases from 0.5%-1.3% to 0.26%-0.8% and the maximum horizontal displacement decreases from 2.76 cm to 1.44 cm. 展开更多
关键词 finite element model ground treatment road widening geosynthetic reinforcement light-weight embankment deepmixed columns separating wall
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Influence of Tacking Sequence on Residual Stress and Distortion of Single Sided Fillet Submerged Arc Welded Joint 被引量:2
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作者 Arpan Kumar Mondal Pankaj Biswas Swarup Bag 《Journal of Marine Science and Application》 CSCD 2015年第3期250-260,共11页
Submerged arc welding (SAW) is advantageous for joining high thickness materials in large structure due to high material deposition rate. The non-uniform heating and cooling generates the thermal stresses and subseq... Submerged arc welding (SAW) is advantageous for joining high thickness materials in large structure due to high material deposition rate. The non-uniform heating and cooling generates the thermal stresses and subsequently the residual stresses and distortion. The longitudinal and transverse residual stresses and angular distortion are generally measured in large panel structure of submerged arc welded fillet joints. Hence, the objective of this present work is to quantify the amount of residual stress and distortion in and around the weld joint due to positioning of stiffeners tack. The tacking sequence influences the level of residual stress and proper controlling of tacking sequences is required to minimize the stress. In present study, an elasto-plastic material behavior is considered to develop the thermo mechanical model which predicts the residual stress and angular distortion with varying tacking sequences. The simulated result reveals that the tacking sequence heavily influences the residual stress and deformation pattern of the single sided fillet joint. The finite element based numerical model is calibrated by comparing the experimental data from published literature. Henceforth, the angular distortions are measured from an in-house developed experimental set-up. A fair agreement between the predicted and experimental results indicates the robustness of the developed numerical model. However, the most significant conclusion from present study states that tack weld position should be placed opposite to the fillet weld side to minimize the residual stress. 展开更多
关键词 residual stress DISTORTION submerged arc welding (SAW) material deposition finite element method
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Analysis of the dialectical relation between top coal caving and coal-gas outbtu rst 被引量:3
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作者 MENG Xian-zheng XIAYongjun +1 位作者 TANG Bing ZHANG Yong-jiang 《Journal of Coal Science & Engineering(China)》 2009年第2期181-187,共7页
According to the different engineering mechanical states of top coal caving andnormal stoping of gaseous loose thick coal seams,the dialectical relation between thiscaving method and dynamic disasters was analyzed by ... According to the different engineering mechanical states of top coal caving andnormal stoping of gaseous loose thick coal seams,the dialectical relation between thiscaving method and dynamic disasters was analyzed by simulating the change of stressstates in the process of top coal initial caving with different mining and caving ratios basedon the ANSYS10.0.The variation of elastic energy and methane expansion energy duringfirst top coal caving was analyzed by first weighting and periodic weighting and combiningwith coal stress and deformation distribution of top coal normal stoping as well as positiveand negative examples in top coal caving of outburst coal seam.The research shows thatthe outburst risk increases along with the increase of the caving ratio in the initial miningstage.In the period of normal stoping,when the mining and caving ratio is smaller than1:3 and hard and massive overlying strata do not exist (periodic weighting is not obvious),it is beneficial to control ground stress leading type outburst.Thus,it is unreasonable toprohibit top coal caving in dangerous and outburst prone areas. 展开更多
关键词 coal and gas outburst top coal initial caving mining and caving ratio ground stress
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