共查询到19条相似文献,搜索用时 78 毫秒
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结构胶胶接接头耐久性的研究进展 总被引:1,自引:0,他引:1
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。 相似文献
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胶接接头耐久性的综合研究 总被引:2,自引:0,他引:2
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。 相似文献
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为了考察外加载荷和介质共同作用对环氧胶接接头老化寿命的影响,在常温条件下将环氧胶接接头浸泡在不同介质中,然后固定在拉力机上分别施加500N、1000N、2000N的外加载荷,研究了环氧胶接接头在不同大小载荷和不同介质作用下的老化寿命变化规律.结果表明,所施外加载荷越大其寿命越短;在相同载荷作用下,铝合金环氧接头在介质中的失效时间顺序为:5%氯化钠溶液<水,而对于钛合金环氧接头在介质中的失效时间顺序为:10%HCl<10%H2SO4<10%NaOH(wt). 相似文献
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对金属胶接接头劈裂试样承载后的应力分布情况进行了实测分析,结果表明胶层沿胶接面试样长度方向上受到分布较宽的拉伸力的作用,印证了作者所提出的胶接接头受劈裂载荷作用力学模型是符合实际的。 相似文献
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胶接接头无损检测研究进展 总被引:2,自引:0,他引:2
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。 相似文献
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This paper presents an experimental investigation into various aspects of epoxy-bonded polymethylmethacrylate (PMMA) and PMMA-to-aluminium joints. The effects of adhesive thickness, overlap area, surface roughness, and environmental exposure on the joint strength were studied. Results indicated that the joint strength was not directly proportional to the overlap area, while sanding had a positive effect on the joint strength. A negative effect was observed when adhesive thickness was increased. The fatigue behaviour of adhesively-bonded joints under dynamic loading was found to be independent of frequency, for the range of values tested; however, it was dependent on the test temperature with greater reduction in fatigue life observed in PMMA-to-aluminium joints at higher temperature. Empirical equations from which the fatigue life of joints can be predicted were obtained by regression analysis. Intermittent fatigue testing of the joints was also performed. The epoxy adhesive tested proved to be a satisfactory choice for outdoor exposure. The rate of degradation of the adhesive was slow with the adherend itself degrading at a faster rate than the adhesive or the bondline. 相似文献
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This paper presents an experimental investigation into various aspects of epoxy-bonded polymethylmethacrylate (PMMA) and PMMA-to-aluminium joints. The effects of adhesive thickness, overlap area, surface roughness, and environmental exposure on the joint strength were studied. Results indicated that the joint strength was not directly proportional to the overlap area, while sanding had a positive effect on the joint strength. A negative effect was observed when adhesive thickness was increased. The fatigue behaviour of adhesively-bonded joints under dynamic loading was found to be independent of frequency, for the range of values tested; however, it was dependent on the test temperature with greater reduction in fatigue life observed in PMMA-to-aluminium joints at higher temperature. Empirical equations from which the fatigue life of joints can be predicted were obtained by regression analysis. Intermittent fatigue testing of the joints was also performed. The epoxy adhesive tested proved to be a satisfactory choice for outdoor exposure. The rate of degradation of the adhesive was slow with the adherend itself degrading at a faster rate than the adhesive or the bondline. 相似文献
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B. M. Parker 《The Journal of Adhesion》1988,26(2):131-154
The durabilities of three pretreatments developed for the structural adhesive bonding of titanium alloys are being investigated. These are alkaline hydrogen peroxide etch (AHP), sodium hydroxide anodise (SHA) and catalytic alkaline hydrogen peroxide etch (CAHP). Natural weathering in several climates and accelerated laboratory aging are being carried out. The AHP etch has proved very durable. To date SHA and CAHP treatments are as good. Comparison of quality control and durability data suggests that wedge test crack growth data may not be suitable for these pretreatments. The use of the accelerated weathering data for predicting natural weathering is discussed. 相似文献
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B. M. Parker 《The Journal of Adhesion》2013,89(2-3):131-154
The durabilities of three pretreatments developed for the structural adhesive bonding of titanium alloys are being investigated. These are alkaline hydrogen peroxide etch (AHP), sodium hydroxide anodise (SHA) and catalytic alkaline hydrogen peroxide etch (CAHP). Natural weathering in several climates and accelerated laboratory aging are being carried out. The AHP etch has proved very durable. To date SHA and CAHP treatments are as good. Comparison of quality control and durability data suggests that wedge test crack growth data may not be suitable for these pretreatments. The use of the accelerated weathering data for predicting natural weathering is discussed. 相似文献
16.
Although carbon fiber epoxy composite materials have excellent properties for structures, the joint in composite materials often reduces the efficiency of the composite structure because the joint is often the weakest area in the composite structure.
In this paper, the effects of the adhesive thickness and the adherend surface roughness on the static and fatigue strengths of adhesively-bonded tubular polygonal lap joints have been investigated by experimental methods. The dependencies of the static and fatigue strengths on the stacking sequences of the composite adherends were observed.
From the experimental investigations, it was found that the fatigue strength of the circular adhesively-bounded joints was quite dependent on the surface roughness of the adherends and that polygonal adhesively-bonded joints had better fatigue strength characteristics than circular adhesively-bonded joints. 相似文献
In this paper, the effects of the adhesive thickness and the adherend surface roughness on the static and fatigue strengths of adhesively-bonded tubular polygonal lap joints have been investigated by experimental methods. The dependencies of the static and fatigue strengths on the stacking sequences of the composite adherends were observed.
From the experimental investigations, it was found that the fatigue strength of the circular adhesively-bounded joints was quite dependent on the surface roughness of the adherends and that polygonal adhesively-bonded joints had better fatigue strength characteristics than circular adhesively-bonded joints. 相似文献
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Although carbon fiber epoxy composite materials have excellent properties for structures, the joint in composite materials often reduces the efficiency of the composite structure because the joint is often the weakest area in the composite structure. In this paper, the effects of the adhesive thickness and the adherend surface roughness on the static and fatigue strengths of adhesively-bonded tubular polygonal lap joints have been investigated by experimental methods. The dependencies of the static and fatigue strengths on the stacking sequences of the composite adherends were observed. From the experimental investigations, it was found that the fatigue strength of the circular adhesively-bounded joints was quite dependent on the surface roughness of the adherends and that polygonal adhesively-bonded joints had better fatigue strength characteristics than circular adhesively-bonded joints. 相似文献
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In this study, the shear strength behavior of adhesively bonded joints, made of aluminum composite foams subjected to high-temperature processes, has been investigated. Aluminum composite foam and solid aluminum blocks were used to form single lap joints and as the binder, a methacrylate-based structural adhesive has been selected. Foam-foam and solid-foam joints were formed and cured at room temperature for 24 hours. After curing process, aging at 200 oC was performed on the samples for 15, 30, 45, 60 minutes. The aged samples were subjected to lap shear testing for adhesively bonded metals and the influences of aging duration on joint strength and failure type were investigated.
As a result, lower strengths were obtained in all samples that aged under high temperature compared to non-aged samples. After the application of short-term (15-30 min) aging processes on samples, it is observed that they have joint strength values about 50% of the joint strength of non-aged samples. However, strength values of short-term aged joints (15, 30 min) remain higher than the strength values of the foam materials used in the tests. These results show that methacrylate-based adhesives subjected to short-term thermal loads up to 200 °C can be used in constructions. 相似文献
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In recent papers it has been reported that epoxide-based adhesives form so-called interphases in adhesive joints. The properties of these interphases play an important role concerning the performance and durability of structural adhesive joints under detrimental service conditions. In this paper, the formulation of a basic epoxy adhesive and a methodology for gaining insight into the local mechanical properties of polymer interphases in structural adhesive joints made with ambient temperature curing epoxy adhesive are presented. The localized strain analysis in the cross-section of shear-loaded adhesive joints is accomplished by combining a high precision micro tensile tester with a digital microscope and by developing a method for preparing, marking, and digitally tracking the local deformations in a micro shear specimen. 相似文献