胶接接头无损检测研究进展

介绍了胶接接头无损检测技术近年来的发展情况，对超声波、声、应力波等无损检测技术的发展作了概要的阐述，同时对胶接接头的强度检测进行了分析，认为检测中所选用的强度相关参数，应充分体现胶接接头对应力的响应，这样才可能实现胶接强度的定量检测。     

复合材料框架胶接接头超声检测研究

针对碳纤维复合材料框架胶接接头的胶接质量问题,提出了使用0.5～10 MHz的宽带窄脉冲探头单侧进行脉冲回波法快速检测。采取试验与理论相结合的方法,采集11种常用接头结构超声波,对其传播特性和检测信号特性进行分析。研究结果表明:试验提出的方法实现了对复合材料框架胶接接头的胶接质量检测,对实际工程检测具有较强的指导意义。     

胶接接头耐久性的综合研究

以AG—80/DDS、环氧—聚砜和环氧—丁腈结构胶为胶粘剂,45~#钢和LY_(12)—CZ铝合金为被粘材料,综合研究了胶接接头的耐久性。研究结果表明,除胶粘剂外,内外应力、温度、介质和被粘物的表面状态均是影响接头耐久性的重要因素。激光双折射法测定胶接接头内应力是较可行的新方法。     

胶接接头力学研究回顾

回顾了胶接接头力学性能方面的研究进展 ,并讨论了进一步研究的方向。     

钛合金胶接接头耐水性的研究

本文介绍了几种表面处理方法对钛合金胶接性能的影响，并讨论了钛合金胶接接头的耐水性能。     

结构胶胶接接头耐久性的研究进展

结构胶是胶黏剂中具有高强度、耐高温、高耐久特性的一类胶黏剂的总称,主要用于部件中承受载荷的胶接连接。胶接接头的耐久性能是结构胶应用中的一个重要指标。主要从影响胶接接头耐久性的内在因素和外在因素以及实验室研究方法对结构胶胶接接头耐久性的研究进展进行综述。     

金属胶接接头的内应力及其消除

对引起金属胶接接头内应力的因素进行了分析，指出胶粘剂的受拘束收缩及受热时胶层内的塑性压缩应变发生是导致接头中出现拉伸内应力的主要原因。文中提出了消除或减轻金属胶接接头拉伸内应力的有效工艺措施。     

膨胀机缸体胶接接头设计及工艺

用合理的接头设计,适宜的胶接工艺及性能优良的胶粘剂,对制氧设备的膨胀机缸体裂缝进行了胶接尝试。经过半年多的运行考核,证明满足了设备运转要求。     

Splicing of reinforcement bars with epoxy joints

The splicing of reinforcement bars in tension using epoxy-sleeve joints is described. The optimum length of the splicing sleeve required and the optimum bonding layer of epoxy resin in the joint were determined in direct tension tests. The performance of the epoxy-sleeve joint made to these optimum dimensions is then compared to that of a lap splice made according to the provisions of CP 110 in a beam flexure test. A sleeve length of 12 bar diameters and an optimum average thickness of 2 mm of the bonding layer of epoxy are shown to develop the full strength of the splices bar. Tensile reinforcement bars spliced using epoxy-sleeve joints are shown to perform satisfactorily as flexural reinforcement in beams and compare favourably with the standard CP 110 lap splice. Epoxy-sleeve joints are shown to produce stiffer beams and reduced crack width at the joints.     

化工行业压力管道的破坏和无损检测

介绍了化工行业压力管道的5种破坏形式及其无损检测.     

Durability of structural adhesive joints

Single lap joint specimens bonded with two commercial epoxy-based film adhesives, FM-73 and FM-300K, were exposed to combinations of different types of ‘load’, ie mechanical load, temperature and moisture/water. The applied mechanical load was high—90% of the nominal strength of the specimen (as determined in tensile experiments). The initial strength of the joint and the residual strength at various time intervals were then determined. The specimens were not influenced by a single type of ‘load’ or even by a combination of two types of ‘load’. However, combining all three ‘loads’ caused spontaneous failure of the specimen. When applying a constant load of up to 60% of the nominal strength, no spontaneous failures were observed within 30 days (even after exposure to hot-wet environment).     

加氢反应器的无损检测

运用渗透探伤、内窥镜、起声波、X射线等检测方法发现加氢反应器顶部混合气接管内壁存在大量纵向裂纹。采取的措施为把氢气和高温蒸汽混合管线与顶部的连接改为沿法线方向插入,混合气从顶部人孔上方的排气孔进入;控制升降温速率小于1℃/min;物料进罐前蒸汽和氢气先进管,物料排尽后再停蒸汽和氢气,降温碱洗,氢氧化钠质量分数小于0. 5%等。     

Long endurance fatigue performance of bonded structural joints

Resin bonded joints are being used for a variety of applications in highway bridges. Such uses involve operation under different combinations of dead and live loading plus weathering. This paper is concerned with the fatigue performance of steel-to-steel lap joints for endurances of up to 10⁸ cycles. The effects on fatigue performance of curing temperature and operating temperature have been examined and work in progress to investigate effects of weathering is described. Special attention is given to performances at long endurances and low stresses relevant to traffic loading during service.     

无损检测技术在塑料制压力管道检验中的应用

随着石油化工行业的发展,塑料制压力管道在社会中应用越来越广泛,其本身安全性评估以及风险防范技术近来受到人们的重视,无损检测技术在塑料制品中的应用还未全面展开。本文介绍了塑料制压力管道的几种失效形式;综述了塑料制压力管道包括超声波检测、声发射检测、红外热成像检测和超声导波检测这四种有潜在运用价值的无损检测技术的原理、特点和发展状况。     

刍议压力容器的无损检测技术

压力容器长期间且持续性的使用将致使其使用性能极易受到外界环境条件相关因素的影响,由此可能导致压力容器处理腐蚀、开裂甚至是损毁等质量问题。为最大限度的确保压力容器运行作业的安全性与可靠性,有必要对其进行系统化的无损检测。本文依据这一实际情况,以无损检测技术为研究对象,着眼于压力容器运行实际情况,从压力容器无损检测技术分析以及超声检测技术在压力容器无损检测中的实践应用分析这两个方面入手,围绕压力容器的无损检测技术这一中心问题展开了较为详细的分析与阐述,并据此论证了无损检测技术的应用在进一步提高压力容器运行质量、运行安全性以及运行可靠性的过程中所发挥的至关重要的作用与意义。     

Precise Nondestructive Determination of the Density of Porous Ceramics

A fast, accurate, inexpensive, and nondestructive method to determine the density of very porous ceramics has been found. This method is an extension of the water-displacement technique with three weighings and the use of glycerol instead of water. For small (1.13 g), 29% porosity B₄C pellets, the precision is 0.002 g/cm³ and the accuracy is better than 0.006 g/cm³ compared with the geometric density.     

Evaluation of interfacial properties in adhesive joints of aluminum alloys using angle-beam ultrasonic spectroscopy

This paper reports an ultrasonic angle-beam technique for the evaluation of interfacial properties of adhesive joints. The technique is based on measurement of the frequency response of obliquely incident ultrasonic signals from an adherend-adhesive interface. A theoretical model was developed for analysis of the interaction between the obliquely incident ultrasonic waves and multilayered adhesive joints. A special ultrasonic goniometer using only one ultrasonic transducer was built to measure the reflected signals. Samples with controlled interfacial properties were prepared for experimental determination of these properties. The experimental results were in good agreement with those predicted from the model. It was found that some of the minima loci in the reflected frequency spectra are independent of either the thickness or the elastic properties of the interfacial layer. This enables us to develop a simple and stable reconstruction procedure to determine the thickness and interfacial properties from experimental data.     

Strength and failure of bulky adhesive joints with adhesively-bonded columns

Strength and failure properties of bulky (i.e. with thick substrate) adhesive joints with adhesively-bonded columns (ABCs) subjected to external loads were investigated experimentally and analytically. From the experimental results, it was found that the strengths of the bulky adhesive joints with ABCs increased considerably when they were subjected to external tensile loads or lateral bending loads. And the joint strengths increased with increasing depths of the blind holes. The failure process of the joints with ABCs was simulated by the technique of element birth and death developed in the finite element method (FEM). The conclusions obtained from FEM coincide with those obtained from the experiments.