金属－橡胶硫化粘接过程中分子取向行为的间接证据

对金属－橡胶热硫化粘接复合体的剥离行为进行了研究，同一粘接试样的双向１８０°剥离试验显示出了巨大的差异。本文分析了弹性材料在硫化过程中的分子行为，并提出了相应的新假设，认为这是由于金属－橡胶在硫化粘接过程中分子取向交联行为所致。这种双向１８０°剥离破坏现象可被看作是金属－橡胶硫化粘接过程中分子取向行为的间接证据。     

固定电子分立元器件用胶粘剂E—4X的研制

介绍了一种不同于灌封材料，具有触变性，粘接性能优良，使用方便的固定电子分立元器件用胶粘剂Ｅ－４Ｘ。与国外同类产品Ｅｐ－４３３ｘ胶粘剂对比，其综合性能优于Ｅｐ－４３３胶粘剂。     

化学镀SiCp／Ni－P复合镀层与基体结合强度及其影响因素

论述了ＳｉＣｐ／Ｎｉ－Ｐ复合镀层与钢基体的结合强度及其影响因素。复合镀层中离界面５μｍ厚度以内区域的组成及应力状态对镀层／基体的界面结合有决定性作用，在该区域以外ＳｉＣ粒径变化不影响镀层的结合强度。适当的热处理可提高界面结合力。     

Analysis of adhesive bonded composite lap joints with transverse stitching

The effect of transverse stitching on the stresses in the adhesive is investigated using an adhesive sandwich model with nonlinear adhesive properties and a transverse stitching model for adhesive bonded composite single-lap and double-lap joints. Numerical results indicate that, among all stitching parameters, thread pretension and stitch density have significant effect on the peel stresses in the adhesive; increase in the thread pretension and the stitch density leads to a decrease in peel stress in the adhesive, while an increase in other parameters generally results in a negligible reduction in peel stress. The effect of stitching was found to be negligible on the shear stresses in the adhesive. Thus it is concluded that stitching is effective for the joints where peel stresses are critical and ineffective for those where shear stresses are critical.     

Residual Stress Evolution in Repair Welds

Abstract: The aim of this paper is to study the influence of the repair procedure on the evolution of residual stress distribution in butt welds. C-Mn steel coupon plates of 11 mm thickness were prepared, subjected to stress relief heat treatment and welded with two beads, using the gas metal arc welding process. After the deposition of two weld beads, two successive repair welds were made on the middle length of the second bead. Longitudinal and transverse residual stresses were measured in the vicinity of the weld, after deposition of the two weld beads and after each repair weld. Residual stress evaluation was conducted using an X-ray diffraction method. The repair welds caused a decrease in magnitude of the initial longitudinal residual welding stresses, and an increase of the transverse residual stress magnitude, in tension at points within the repair length, and in compression at points outside the repair length.     

管具螺纹的数控加工及修理技术应用

从现场实用的角度对比分析了手动、数控2种修螺纹方法,提出了在管具修理工作中研究推广数控技术车修管螺纹的必要性,介绍了试验研究过程中的技术问题。     

反应结合氧化铝陶瓷制备新工艺

本文评述了反应结合氧化铝陶瓷的制备工艺原理，配料组成，研磨与原料细度，成形压力和升温速率等对陶瓷性能的影响。介绍了几种反应结合氧化铝陶瓷制造实例。     

天然气长输管道泄漏的抢修与维护

分析了天然气长输过程中，由于各种原因，导致天然气长输管道出现泄漏，找出泄漏抢修的方法，指出应积极做好预防与维护工作。     

电子词典生产中的SMT工艺

本文讨论了在电子词典生产中的ＳＭＴ工艺，着重阐述了ＳＭＴ工艺流程，列举了一些不良焊接及其产生不良焊接的原因以供参考。