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全文通过对玻璃钢制品收缩变形的原因分析,并采取相应的措施与简单计算,提出了克服收缩变形的初步意见,从而把这种变形控制在最低限度之内,提高了玻璃钢制品的质量。 相似文献
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本文结合变形纱的变形机理,根据气流一元定常等熵流动的理论,阐述空气变形喷嘴流道内最佳结构特点,并分析研究空气变形喷嘴的主要结构参数. 相似文献
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喷嘴是空气变形工艺的心脏部件。研究变形丝变形机理,对于提高变形丝的质量,增加花色品种,降低能耗,具有重要意义。本文通过机理分析,采用实验测试结合工艺试验的方法研究喷嘴对变形丝的作用机理,所得出的结果被证明是正确的。这些结果有助于深化对变形丝成形过程的认识,并且首先使这种认识建立在科学实验的基础之上。 相似文献
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变形是什么?差不多每个人都看了《终结者Ⅱ》这部影片,人们还喜欢把这部影片叫做T2。这部由史瓦辛格主演的火爆影片使观众久久不能忘怀,人们印象最深的不是它的故事情节,而是影片里一些难忘的特效。影片中使用的动画技术包括“结构映射”技术和“变形”技术。变形是刚刚兴起的技术。这个来自希腊的词语“变形”的意思是“构形”或“改变形状”。“变形”的约定俗成的意思是从一幅图像到另一幅图像的转变。简单地说就是,源图像中的某一位置的像素位置到目标图像中另一个位置的转变。变形技术对黑白照片,彩色照片,绘画或 相似文献
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在一定的工艺条件下,运用自行研制的BXSPb型(属Hema型)喷嘴,就各主要结构参数与变形效果的影响因素进行了工艺对比试验与分析,涉及的主要参数包括喷嘴芯子截面积、后锥角、进气小孔间夹角、直孔道轴向距离、进气压力及挡体存在对成纱效果的影响,并对各参数均提供了推荐参考值。 相似文献
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分析了中小型贮罐安装过程中的罐壁板变形的原因,提出了罐壁板垂直度超标主要是环焊缝间隙差引起的新概念;为防止这种缺陷出现,从下料、滚板、运板、围板、加胀圈和焊接以及提升等方面,提出了具体的预防措施;同时提出了胀圈撑力估算公式,指出了用弧板弥补胀圈不圆的方法。 相似文献
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本文主要探讨化妆土的膨胀系数对釉面砖变形的影响,研究配方组成中石英和长石的含量与化妆土膨胀系数的之间关系。结果表明,石英和长石含量过大或过小导致坯釉膨胀系数不匹配,从而影响釉面砖外形;当石英含量30g,长石含量20g,能提高化妆土热膨胀系数,砖型的上凸程度减少,平整度得到最佳改善。 相似文献
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吕延茂 《化学工业与工程技术》2004,25(1):49-54
简述了筒节圆度对壳体制造质量的影响、产生圆度的原因、测量筒节圆度的方法和确保筒节圆度的措施。提出了薄壁筒体卧置状态自重变形量的计算公式,可以较准确地知道筒节自重对筒节圆度影响的程度。 相似文献
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《Journal of Adhesion Science and Technology》2013,27(11):959-972
Spherical glass particles having radii between approximately 0.5 and 100 *m were deposited onto a polyurethane substrate and the radii of contact, resulting from the adhesion forces between the particles and the substrate, were determined using SEM. For particles having radii less than approximately 5 μm, it was found that the contact radius varied as the particle radius to the 0.75 power. In addition, large menisci, presumably resulting from tensile interations, were observed. For particles having radii between 5 and 60 μm, the contact radius varied as the particle raidus to the 2/3 power. Stretching of the substrate was also observed for particles having radii of approximately 100 μm. This is probably a harbinger of the impending separation of the particle from the substrate, due to gravitational forces. The thermodynamic work of adhesion was calculated from the data and the results were compared with the predictions of several theories of particle adhesion. 相似文献
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Filler/matrix-debonding and micro-mechanisms of deformation in particulate filled polypropylene composites under tension 总被引:1,自引:0,他引:1
Michael Jerabek Zoltan Major János Móczó Béla Pukánszky Reinhold W. Lang 《Polymer》2010,51(9):2040-5482
Volume strain measurements of particulate filled polypropylene (PP) composites containing different glass beads and talc as filler were carried out in tension as a function of temperature and strain rate to determine the micro-mechanisms of deformation. While local cavitation mechanisms (micro-voiding, crazing, and micro-cracking) and subsequent debonding of the particles dominated as failure mechanisms at high strain rates and at room temperature, a more significant contribution of local shear yielding was observed with a reduced contribution of cavitational mechanisms at low strain rates or at 80 °C. This change in the dominating micro-mechanisms of deformation resulted in smaller volume strains during the tensile loading of the composites than for the respective neat matrix. Moreover, a novel approach is introduced for the detection of debonding using volume strain measurements, which takes into account the dilatational and deviatoric behavior of the neat matrix polymer and the composite. The results are supported by acoustic emission measurements carried out simultaneously on the same specimens. 相似文献
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采用带极堆焊的焊接方法对16MnR管板进行不锈钢堆焊,主要解决的问题是:选择正确的焊接材料和焊接工艺规范,使堆焊层焊缝组织为奥氏体加3~12%铁素体的双相组织,保证其耐腐蚀和抗裂性。另外还需制定合理的焊接措施,控制管板的焊接变形。 相似文献