射频无电极放电氮气等离子体光源研究

本文报道了一种利用射频无电极放电激励的氮气等离子体新型光源，测出了辐射光谱、光功率、工作气压等光源相关参数，优化实验条件得出的电光转换效率达22．05％。最后运用此光源成功的对一种印刷预涂感光版（pre-sensitive plate，PS版）进行了曝光，通过曝光前后PS版感光层颜色的光密度变化评价了感光效果。     

基于酸解型聚甲基丙烯酸酯的化学增幅成像材料及应用

甲基丙烯酸分别与乙烯基乙基醚和二氢吡喃反应得到羧基被保护的酯化物。这些甲基丙烯酸酯单体进行均聚并分别与甲基丙烯酸甲酯、甲基丙烯酸-2-羟乙酯进行二元共聚。这些聚合物的保护基具有在室温下的高酸解活性,可以和产酸剂（三嗪化合物）、酚醛树脂一起组成化学增幅型感光成像材料,可用作i-线光致抗蚀剂和高感度PS版感光剂,其感度在100mj／cm。以下。此感光体系中加入红外染料即可用作热敏CTP版材成像材料。都获得了很好的成像表现。     

射频脉冲N2等离子体蓝紫光源的发光性能研究及其应用

继续沿用传统PS版的计算机直接制版技术(CTP)对于我国的印刷包装行业具有特殊重要的意义.本文利用占空比可调的脉冲射频低温等离子体电源激励氮气等离子体,通过测量辐射光功率密度,从不同占空比、射频功率、气压等方面研究了等离子体光源的发光特性,在入射功率61 W,占空比54.5%,气压550 Pa条件下获得了256 μW/cm2的蓝紫光输出,可以满足PS版感光的要求.最后给出了利用本光源使PS版感光的结果.     

基于酸解型聚甲基丙烯酸酯的化学增幅成像材料及应用

甲基丙烯酸分别与乙烯基乙基醚和二氢吡喃反应得到羧基被保护的酯化物。这些甲基丙烯酸酯单体进行均聚并分别与甲基丙烯酸甲酯、甲基丙烯酸-2-羟乙酯进行二元共聚。这些聚合物的保护基具有在室温下的高酸解活性。可以和产酸剂（三嗪化合物）、酚醛树脂一起组成化学增幅型感光成像材料,可用作i-线光致抗蚀剂和高感度PS版感光剂,其感度在100mj／cm^2以下。此感光体系中加入红外染料即可用作热敏CTP版材成像材料。都获得了很好的成像表现。     

高感度阳图PS版感光剂与涂层的耐醇性

本文绘制了不同酯化母体,不同酯化率重氮萘醌系PAC在异丙醇中的溶解度曲线。通过观察溶解度曲线,选择合成酯化率略高于拐点处酯化率的感光树脂应用到配方研究中。在配方试验中以连苯三酚缩丙酮树脂（简称PA树脂）与2,1-重氮萘醌-5-磺酰氯（简称215）酯化的感光树脂和线性酚醛树脂与2,1-重氮萘醌-4-磺酰氯（简称214）酯化的感光树脂作为阳图PS版感光涂层的感光剂,以线性酚醛树脂作为成膜树脂,通过调节B／P值,可优选出感度高,耐醇、抗碱性能好的阳图PS版感光组成物。     

新型硫代吖啶酮的合成及在PS版光敏涂层中感光性能的研究

合成了十种硫代吖啶酮，通过IR，UV，MS等分析方法，测定了产物的结构，并研究了10种不同结构硫代吖啶酮在光聚合型PS版光敏涂层中的感光特性，结果表明，含N－丁基硫代吖啶酮的涂层的感度最高。     

有机硅聚氨酯丙烯酸酯预聚物的合成、表征及感光性

以异佛尔酮二异氰酸酯（IPDI）、烷羟基硅油、丙烯酸β－羟乙酯（HEA）为原料，合成了一种有机硅聚氨酯丙烯酸酯预聚物（ISAE）。探讨了原料结构、反应温度、合成方法等因素对反应的影响，确定最佳反应条件为：反应温度低于80℃，合成方法为过量IPDI先与烷羟基硅油反应，然后再与HEA反应。表征了ISAE的结构，ISAE是含硅聚氨酯丙烯酸酯和不含硅聚氨酯丙烯酸酯的混合物。研究了ISAE感光体系的感度，发现ISAE感光体系具有很高感光性，感度值为12．3mJ/cm^2，其紫外响应峰为333nm。     

新型直接照相制版材料

近几年来,以PS版为代表的照相制版技术在国外得到了广泛的应用,但PS版等版材感光度低,作为直接制版材料,须配备高感度的中间版。因此,一种新型的具有高感度的直接照相制版材料(无须中间版复制)也即利用银盐扩散转移反转原理(Silver     

研究诊断PS版

<正>PS版是预涂感光印版,也有称预涂感光平板,是预涂感光层的可随时晒版的平印版,英文全称"Presen Sitized P l a t e",取其词头人们习惯称PS版。PS版最早出现在二十世纪30年代,由德国卡勒公司开始研制,第一块PS版在1946年正式投入市场。一、PS版结构及制版机理     

耐水性丝网印刷感光高分子性能研究

研究了具有耐水性和高感光度的水性感光性高分子材料，该材料用于制作线路板和集成电路用的丝网印刷胶，并可用水显影，其工艺简单、无污染。用重氮树脂为光敏剂、聚乙烯醇和聚醋酸乙烯酯为成膜剂制作了感光性树脂，研究了聚醋酸乙烯酯对提高感光性树脂的耐水性的作用以及其对体系感觉的影响。通过试验得出加入聚醋酸乙烯酯其配比合适时，可得到耐水性的高感的感光性树脂，其感度值为20mJ/cm^2，水泡48h后对感光膜无影响。得到了综合性能良好的感光高分子。     

SiCP/Al功能梯度装甲板抗侵彻性能的试验与数值模拟

采用粉末冶金方法制备碳化硅陶瓷颗粒(SiC_P)增强金属铝基复合材料板(MMCs), 并采用热压扩散法制备功能梯度装甲板(FGM)。利用高速冲击空气炮系统, 对纯铝靶板和两种不同铺层结构的功能梯度装甲靶板进行侵彻试验, 并利用LS-DYNA软件对侵彻试验过程进行数值模拟分析, 同时考察等厚、 等面密度下SiC颗粒分布对抗侵彻性能的影响。研究结果表明, 功能梯度板的抗侵彻性能比纯铝板好, 而两种不同铺层结构功能梯度板的抗侵彻性能相差不大。数值计算结果与现有试验结果取得了较好的一致, 说明了数值模拟的有效性。从数值计算结果可以看出, 层状功能梯度板比等厚、 等面密度均质复合材料靶板的抗侵彻能力好, 并可近似地认为等厚、 等面密度下多层功能梯度板的抗侵彻性能对颗粒分布不敏感。     

Finite element evaluation of residual stresses in thick plates

This paper makes use of the Finite Elements Method (FEM) to study and analyze residual stresses in the cold bending and welding of thick plates. The welding model consists of two steps: first, performing of the thermal transient analysis model; and second, the carrying out of the mechanical transient analysis based on the temperature pattern at each node on each particular time. Used in these models is the inelastic temperature-dependent material. The output of the model includes residual stresses and permanent distortion; these were then compared with verified experimental results. The validated model and the results exhibit satisfactory agreement up to a 15-percent difference. As for the cold bending of thick plates, it is modeled using another finite element model and the residual stresses and permanent curvature of the thick plates are computed numerically. Again, the FEM model was validated against some official experimental results and satisfactory agreement between them was observed. Finally, the effects of these two different sources of residual stresses were combined, the combined effects established, and the results then discussed.     

Levy-type solution for buckling analysis of orthotropic plates based on two variable refined plate theory

This paper presents closed-form solution for buckling analysis of orthotropic plates using two variable refined plate theory. The theory accounts for a quadratic variation of the transverse shear strains across the thickness, and satisfies the zero traction boundary conditions on the top and bottom surfaces of the plate without using shear correction factors. Governing equations are derived from the principle of minimum total potential energy. The closed-form solutions of rectangular plates with two opposite edges simply supported and the other two edges having arbitrary boundary conditions are obtained by applying the state space approach to the Levy-type solution. Comparison studies are performed to verify the validity of the present results. The effects of boundary condition, loading condition, and variations of modulus ratio, aspect ratio, and thickness ratio on the critical buckling load of orthotropic plates are investigated and discussed in detail.     

柔印橡胶版和感光树脂版印刷性能对比实验

目的比较柔印感光树脂版和橡胶版的表面特性,分析影响版材油墨传输性能和图像再现的原因。方法通过表面能、硬度和粗糙度来表征印版的表面特性,制作相同加网线数的2种版材;在相同的印刷条件下,通过分光光度计和显微镜分析2种版材的油墨转移和图文再现特性。结果感光树脂版表面能比橡胶版高,但橡胶版表面粗糙度比感光树脂版大。从印刷效果来看,感光树脂版的油墨转移效果更好,实地油墨密度更高,而橡胶版的网点扩大程度更小。采用UV油墨印刷时,感光树脂版的印刷反差略高,而采用水性油墨印刷时,两者的印刷反差基本相同。此外,橡胶版比感光树脂版可实现更精确的线条和文字。结论针对特定柔性版,可通过分析研究印版的表面特性,为印刷工艺合理选择版材。     

Winkler-Pasternak地基上四边固支层合板的振动

本文在文[1]的基础上,利用Bolotin方法,在考虑横向剪切变形的情况下,首次获得了Winkler-Pasternak地基上四边固支对称正交铺设层合板自由振动问题的渐近解析解.对于不同层数、不同长厚比的层合板以及在不同地基反力系数的情况下,文中进行了具体的数值计算,给出了相应的数值结果.作为本文一个简化算例,计算了弹性地基上正交各向异性厚板自由振动的固有频率,与其他文献所给结果非常一致.      

波纹夹层板线性弯曲分析的无网格伽辽金法

提出了一种求解波纹夹层板结构线性弯曲问题的无网格模型。将波纹夹层板看成两侧平板和中间波纹板核的复合结构,用正交各向异性板等效近似波纹板核。先基于一阶剪切变形理论,由无网格伽辽金法建立各板的刚度方程,再通过位移协调条件将各板刚度方程叠加,以得到整体刚度方程。采用全转换法处理位移边界。算例表明：该文所提出的无网格模型分析波...     

Effect of projectile nose shape,impact velocity and target thickness on the deformation behavior of layered plates

The present study is based on the experimental and numerical investigations of deformation behavior of layered aluminum plates of different thicknesses under the impact of flat, ogive and hemispherical nosed steel projectiles. Thin-layered plates arranged in various combinations were normally impacted at different velocities with the help of a pneumatic gun. Ballistic limit velocity and the residual velocity of the projectiles for each layered combination were obtained experimentally as well as from the finite element code, and these were compared with those of the single plates of equivalent thicknesses. For two layers, the residual velocity was comparable to that of the single plate, however, when the number of layers was increased the velocity drop was found to be higher in the case of the single plate. Ogive nosed projectile was found to be the most efficient penetrator of the layered target. Hemispherical nosed projectile required maximum energy for perforation. Deformation profiles of the target plates in the layered combinations were measured, and it was found that hemispherical nosed projectile caused highest plastic deformation of target plates. Numerical simulation of the problem was carried out using finite element code ABAQUS. Explicit solution technique of the code was used to analyze the perforation phenomenon. Results of the finite element analysis were compared with experiments and a good agreement between the two was found.     

梯度功能材料薄板瞬态热弹性弯曲有限元分析

用层合板有限元法分析了由ZrO₂和Ti-6Al-4V组成的新型梯度功能材料薄板的瞬态热弹性弯曲应力问题,并对本方法的正确性进行了检验。讨论了加热、 冷却热边界条件以及两种力学边界条件(固支和简支)对梯度功能材料薄板的瞬态热弹性弯曲应力分布的影响。发现：(1) 在加热过程中,简支板低温金属侧出现较大压应力;在冷却过程中,简支板高温陶瓷侧出现较大拉应力; 且其拉、压应力会随着板上、下表面温差的增大而增大。(2) 无论是简支板还是固支板, 在冷却过程中,沿整个厚度板内部压应力均较大。(3) 在本文的相同条件下,固支板比简支板更适合高温、大温差的使用环境。     

Finite Element and Plate Theory Modeling of Acoustic Emission Waveforms

A comparison was made between two approaches to predict acoustic emission waveforms in thin plates. A normal mode solution method for Mindlin plate theory was used to predict the response of the flexural plate mode to a point source, step-function load, applied on the plate surface. The second approach used a dynamic finite element method to model the problem using equations of motion based on exact linear elasticity. Calculations were made using properties for both isotropic (aluminum) and anisotropic (unidirectional graphite/epoxy composite) materials. For simulations of anisotropic plates, propagation along multiple directions was evaluated. In general, agreement between the two theoretical approaches was good. Discrepancies in the waveforms at longer times were caused by differences in reflections from the lateral plate boundaries. These differences resulted from the fact that the two methods used different boundary conditions. At shorter times in the signals, before reflections, the slight discrepancies in the waveforms were attributed to limitations of Mindlin plate theory, which is an approximate plate theory. The advantages of the finite element method are that it used the exact linear elasticity solutions, and that it can be used to model real source conditions and complicated, finite specimen geometries as well as thick plates. These advantages come at a cost of increased computational difficulty, requiring lengthy calculations on workstations or supercomputers. The Mindlin plate theory solutions, meanwhile, can be quickly generated on personal computers. Specimens with finite geometry can also be modeled. However, only limited simple geometries such as circular or rectangular plates can easily be accommodated with the normal mode solution technique. Likewise, very limited source configurations can be modeled and plate theory is applicable only to thin plates.     

超声波检测试块真实缺陷的精度验证

目的 研究超声波检测试块中真实缺陷的形态、精度及其偏差产生原因,为进一步提高试块精度提供技术支持。方法 采用射线检测、超声检测及解剖测量方法,对自主研发的超声检测试块中植入的真实缺陷进行了检测,分析了缺陷的几何尺寸及位置坐标参数与设计值之间的偏差及其产生原因。结果 经表面打磨后,缺陷植入痕迹已完全消除,植入的裂纹形态自然,闭合度较好,且端点清晰,无二次扩展现象。经植入焊接后,缺陷载体与试件母体形成完全冶金结合,植入缺陷与自然缺陷在超声波检测信号上无区别,且在探头到缺陷之间的声束路径上,没有显示异常的反射界面或次生缺陷信号。由射线和超声检测可知,缺陷的几何尺寸及位置坐标的偏差为±2.2 mm。由解剖测量可知,平均偏差绝对值小于0.7 mm。结论 缺陷植入前设定的熔化余量与植入过程中焊接所产生的端部熔化量之间的差异造成了植入缺陷尺寸和位置与设计值之间的偏差。