饱和粘土中球孔扩张问题弹塑性解析

为了研究静力触探试验及沉桩扩孔等工程问题,基于修正剑桥模型,推导了不排水条件下球孔扩张问题的半解析解。将扩张球孔周围土体分为临界状态区、塑性区以及弹性区三个区域。弹性区内,利用弹性理论得到应力和孔隙水压力的解答;临界状态区及塑性区内,利用相关联的流动法则、拉格朗日分析法建立了关于应力的一阶非线性常微分方程组,以弹塑性界面处的应力分量作为初值,求解微分方程组可得到应力和孔隙水压力的解答。研究结果表明：各向同性超固结比对扩孔压力、土体应力、超孔隙水压力以及塑性区范围均具有显著影响,且扩孔过程中土体剪切模量并非常量,其随扩孔半径、各向同性超固结比的变化而变化;同时通过与已有解答进行比较,对本文方法的可靠性进行了验证。     

摩托车箱体压铸件失效分析及预防

为了提高压铸件的质量，优化模具结构，解决JY110摩托发动机箱体压铸件的气孔和缩松缺陷．对这些缺陷作了详细分析。在压铸模具设计上，提出了防止措施，主要是对内浇口的设置和型芯提出了修改方案。结果表明正确地设置内浇口对减少箱体的缺陷有很大的作用。     

Processing,deformation, and failure in superplastic aluminum alloys: Applications of orientation-imaging microscopy

The importance of grain size refinement in enabling superplasticity is reviewed, and the current understanding of grain boundary characteristics is summarized. The application of orientation-imaging microscopy (OIM) methods to the processing response and the deformation and failure modes in superplastic aluminum alloys are illustrated through microtexture analysis and determination of grain boundary characteristics in selected commercial materials. Continuous and discontinuous recrystallization reactions exhibit distinct microtextures and grain boundary characteristics. The application of OIM and microtexture analysis to the evaluation of both deformation and failure mechanisms during superplastic forming is illustrated. This paper was presented at the International Symposium on Superplasticity and Superplastic Forming, sponsored by the Manufacturing Critical Sector at the ASM International AeroMat 2004 Conference and Exposition, June 8–9, 2004, in Seattle, WA. The symposium was organized by Daniel G. Sanders, The Boeing Company.     

磁力研磨在模具型腔精加工的应用

提出一种新的模具型腔精加工方法———磁力研磨法 ,并对该方法在模具型腔精加工中的应用给予了充分的论证 ,同时对影响磁力研磨的一些因素进行了讨论 ,提出了该技术在模具精加工中的应用前景     

发动机球铁风扇支架缩孔和缩陷的成因及防止

分析了风扇支架球铁铸件缩孔和缩陷产生的原因,应用均衡凝固理论,通过改进冒口的安放位置及冒口尺寸,有效地解决了缩孔和缩陷问题。     

基于事例与精铸特征的涡轮叶片模具型腔体设计

模具型腔体设计是涡轮叶片精铸模设计的前提,它直接影响精铸模的设计效率,是一项典型的强经验、弱理论的工作.为叶片递增模型建立特征库、事例库,将专家经验知识化、规则实例化,实现基于事例推理与基于特征推理技术相结合进行叶片模型转换,同时考虑收缩放型,生成型腔体模型,使得模具型腔体设计更加合理,从而提高精铸模的经济性和时效性.     

Effects of gold plating on the resistance to high temperature discoloration of the cavity for ceramic packages

The effects of thickness and types of gold plating on the resistance to high temperature discoloration of gold plating on cavity surface of ceramic package were investigated. It was found that the thicker gold plating, the less discoloration degree for ceramic packages. Non-cyanide gold plating performed better resistance to high-temperature aging than cyanide gold plating. The relationship between the gold plating thickness and the amount of diffused Ni to the gold plating of ceramic packages with Au/Ni and Au/Ni-Co platings after heating at 420℃for 15 min was also studied. When the gold plating thickness reach 2.0 μm and 1.6 μm for Au/Ni and Au/Ni-Co plating systems, respectively, no discoloration was observed on the gold plating surface of cavity, and the corresponding diffused Ni amounts (mass fraction) are 1.0% and 0.4%, while the diffused Co to the gold plating is 0.04%.     

口腔修复用铸造钴铬合金等离子焊接工艺研究

试验研究了钻铬合金口腔修复材料微束等离子弧焊的可行性。焊接过程电弧稳定，焊接接头熔合良好，未见裂纹、未焊透、夹渣、气孔等缺陷。力学性能与显微组织分析表明：焊缝与母材均为铸态的树枝状晶粒，几乎无焊接热影响区，接头成分均匀，焊缝与母材强度基本一致。微束等离子弧焊在口腔材料修复领域具有很好的应用前景。     

模具型腔的几种精整加工方法的对比分析

通过对模具型腔工作面的几种精整加工方法的对比分析，研究和探讨如何提高模具型腔工作面质量的方法，并提出精整加工的发展方向。     

在线布流调节影响铸嘴型腔熔体流场和温度场的研究

建立了在线布流调节时铸嘴型腔熔体非定常流动和传热数学模型，应用数值方法仿真分析了入口速度斜坡变化时铸嘴型腔流场、温度场、压力场的动态演化过程。结果表明，对型腔进行在线布流调节来改善铸嘴型腔流场、温度场是可行的。