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1.
本文以较为准确的轧机振动状态下的轧制压力模型为基础,对宽带钢冷轧机干摩擦阻尼减振进行了数值模拟的研究。研究结果与实际观测值相等。 相似文献
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We present results of the application of a three-dimensional rigorous-vector coupled-wave theory to the design of polarizing holographic optical elements. Two different cases have been selected giving rise to two types of element, one of which is completely original. Experimental realizations were performed. The recording material was dichromated gelatin because of its outstanding performance related to diffraction efficiency. A fair agreement between the theoretical previsions and the experimental results was achieved. 相似文献
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Barelli S Canellini G Thadikkaran L Crettaz D Quadroni M Rossier JS Tissot JD Lion N 《Proteomics. Clinical applications》2008,2(2):142-157
Protein oxidation mechanisms result in a wide array of modifications, from backbone cleavage or protein crosslinking to more subtle modifications such as side chain oxidations. Protein oxidation occurs as part of normal regulatory processes, as a defence mechanism against oxidative stress, or as a deleterious processes when antioxidant defences are overcome. Because blood is continually exposed to reactive oxygen and nitrogen species, blood proteomics should inherently adopt redox proteomic strategies. In this review, we recall the biochemical basis of protein oxidation, review the proteomic methodologies applied to analyse redox modifications, and highlight some physiological and in vitro responses to oxidative stress of various blood components. 相似文献
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Three-dimensional chemo-thermomechanically coupled simulation of curing adhesives including viscoplasticity and chemical shrinkage 总被引:1,自引:1,他引:0
Christoph Liebl Michael Johlitz Bülent Yagimli Alexander Lion 《Computational Mechanics》2012,49(5):603-615
Based on the one-dimensional material model developed by Liebl et al. (Arch Appl Mech, 2011) a three-dimensional viscoelastic-viscoplastic material model for small deformations of curing adhesives on the basis of
continuum mechanics is proposed in this contribution. The model describes the most relevant phenomena which occur during curing
processes in the automotive industry and includes the effects of temperature and degree of cure on the mechanical properties
of the material. Thermal expansion as well as chemical shrinkage are also contained. The yield stress for the viscoplastic
part of the model goes back to the work of Schlimmer and Mahnken (Int J Numer Meth Eng 63:1461–1477, 2005), but is formulated in reference to the degree of cure and the temperature. Therefore this model considers chemo-thermomechanical
coupling and extends the plasticity approach of Schlimmer and Mahnken, which is devised for cured adhesives, to the whole
curing range, from the uncured to the fully cured adhesive. A peculiar focus is hereby laid on epoxy resins used in the automotive
industry as structural adhesives. 相似文献
7.
局部浪形对冷轧钢卷起筋的影响 总被引:3,自引:1,他引:2
针对带材卷取过程中在钢卷表面形成的容易使开卷后带材产生附加浪形、造成产品降级的起筋问题,在大量的现场试验与理论研究的基础上,结合小局部浪形与大局部浪形的相关特点,提出一套大小局部浪形的理论判断标准,并对大局部浪形引起起筋过程中轴向力的由来、起筋区域临界失稳应力与轴向力的计算等问题进行系统的分析。然后,分小局部浪形与大局部浪形两种情况,分别建立相应的起筋量计算数学模型,定量模拟出了不同情况下起筋量的大小,并将模型计算结果与现场实测值进行了跟踪对比,统计表明模型平均偏差保持在10%的范围内,单次最大偏差小于(等于)15%,达到相当高的精度,满足了工程上对起筋量预报的精度要求,并为厂方起筋缺陷的治理提供了有力的理论依据,创造了良好的经济效益。 相似文献
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高速冷带轧机垂直自激振动稳定性分析的数值计算方法 总被引:5,自引:0,他引:5
本文在充分考虑轧机垂直振动过程中辊缝非线性的基础上,利用轧制理论方程和机械振动理论中的能量判据,给出了更精确的分析高速冷轧机垂直自激振动稳定性的数值计算方法。 相似文献
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In this paper,such a new lateral displacement function is proposed that the lateral flow velocity is con-tinuous at the entry and the exit of deformation zone.A new kind of finite strip method—the third powerB-spline finite strip method—is put forward to simulate strip rolling process.Front and back tension stressesare formulated.The computed results of the transverse distributions of the front and back tension stresses areclose to the experimental results.The paper lays a foundation for further analysing the three-dimensionalstresses and deformations of strip rolling. 相似文献
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针对攀枝花钒钛磁铁矿的特殊性,探讨了攀钢冶炼过程中TiO2的流向和分布情况,论述了钛系列精细化工产品深度开发的重要性,对攀枝花钛化工的发展方向提出了具体建议.认为,研制高纯TiO2微粉和超微粉、钛酸酯偶联剂、TiCl2催化剂、钛系列彩色颜料、无机钛酸盐等多品种,作为大宗化工产品钛白颜料及钛冶金产品的补充,对进一步提高攀枝花钒钛磁铁矿的综合利用,具有十分重要意义. 相似文献