共查询到18条相似文献,搜索用时 78 毫秒
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运用有限元法研究了偏轴、同轴和折曲型等三种单搭接胶接接头的工作应力分布规律。结果表明:与其他两种接头相比,折曲型单搭接胶接接头可有效降低搭接区端部的剥离应力和剪切应力峰值;在数值分析所用参数及条件下,Ⅰ型折曲接头的剥离应力降幅超过了75%,其他峰值应力的降幅也超过了45%~50%,并且应力分布趋于均匀;Ⅰ型折曲接头使出现应力峰值的位置从搭接区的端部转移至中部,从而显著提高了接头的承载能力,是一种优于普通同轴接头的胶接接头形式;对于受剪切载荷作用的接头而言,采用Ⅱ型折曲接头更为合理,可进一步提高接头承受剪切载荷的能力。 相似文献
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折曲胶接接头应力分布的数值分析 总被引:1,自引:1,他引:1
运用有限元法研究了偏轴、同轴和折曲型等三种单搭接胶接接头的工作应力分布规律。结果表明:与其他两种接头相比,折曲型单搭接胶接接头可有效降低搭接区端部的剥离应力和剪切应力峰值;在数值分析所用参数及条件下,I型折曲接头的剥离应力降幅超过了75%,其他峰值应力的降幅也超过了45%~50%,并且应力分布趋于均匀;I型折曲接头使出现应力峰值的位置从搭接区的端部转移至中部,从而显著提高了接头的承载能力,是一种优于普通同轴接头的胶接接头形式;对于受剪切载荷作用的接头而言,采用II型折曲接头更为合理,可进一步提高接头承受剪切载荷的能力。 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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采用LY12铝合金材料在Ansys12.0软件平台上建立环氧树脂胶粘剂双搭接胶接接头有限元模型进行分析,着重考察了在冲击载荷作用下胶层厚度的改变对胶接接头应力分布的影响。研究结果表明:在一定范围内,随着胶层厚度的增加,胶接接头中最大应力值逐渐下降,而最小应力值开始先下降,在胶层厚度为0.4 mm时最小,之后应力值又继续增大,且最大应力值总是出现在胶层界面的边缘处;在冲击速率为3.4 m/s时,胶接接头在0.4、0.6 mm的胶层中节点的轴向应力Sx、剥离应力Sy、剪切应力Sxy、第一主应力S1、等效应力Seqv随着胶层厚度的增加,波动范围变窄,应力峰值也变小,而胶层厚度为0.2 mm时应力值波动异常剧烈,峰值很大。 相似文献
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受集中载荷作用的金属胶接接头应力分布研究 总被引:3,自引:0,他引:3
分析了金属胶接接头受集中载荷作用下应力分布的一般模型,指出了其局限性和不足。借助于金属试样表层的显微硬度测定及应变片电测法间接确定了胶接接头承受不同的载荷作用时接头上的实际应力分布,结果表明胶层中存在着较宽的分布拉伸应力。作者根据实验结果提出了金属胶接接头在集中载荷作用下肢层内应力分布的修正模型。 相似文献
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胶层中间隙长度及位置对接头剪切强度的影响 总被引:1,自引:0,他引:1
研究了在单搭接接头上、胶缝中预留的不同长度间隙对接头剪切强度和剪切应力分布的影响。结果表明,随着间隙长度的增加,接头的承栽能力趋于减小,但接头的实际剪切强度却持续上升.当间隙长度再继续增加时,接头的实际强度趋于下降。研究中还发现间隙所处的位置对接头的剪切强度有较大的影响,胶层端部预留间隙使接头的承载能力和实际强度均显著下降。有限元数值分析的结果表明,间隙长度超过某特定值后,胶层中的应力集中系数会急剧上升,间隙位于端部时胶层中的应力集中程度明显高于位于中部处。 相似文献
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胶粘剂特性和厚度对劈裂载荷作用下胶接接头应力分布的影响 总被引:4,自引:0,他引:4
运用三维弹塑性有限元法对劈裂栽荷作用下的胶接接头(即劈裂接头)承载后的应力分布特征进行了分析,重点研究了胶粘剂层厚度对劈裂接头应力分布的影响。结果表明,胶粘剂的性能对应力分布有较大影响,提高胶粘剂强度和减小胶层厚度,均导致胶层应力集中加剧,各向正应力峰值呈上升趋势,各向剪切应力则正好相反;并且劈裂接头中应力分布以三向主应力为主,剪切应力的存在亦不可忽略。故在不引起过大应力集中和较大胶层缺陷条件下采用高强度的胶粘荆和较厚胶层对提高劈裂接头强度有利,实验结果与有限元分析相吻合。 相似文献
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The purpose of this paper is to present a prediction model of the curing residual stress for carbon fiber reinforced plastic (CFRP) and aluminum (Al) adhesive single-lap joints. Based on the lamination theory and formation mechanism of the curing residual stress of composite structures, we have found that high curing temperature in joints will lead to a significant increase of the residual stress. In the CFRP/Al stacks, residual tensile stresses are found in the Al and glue layer, while compressive stresses in CFRP. Meanwhile, the residual stress in glue layer is smaller than that in the Al and CFRP. More comparisons are made among the prediction, finite element analysis (FEA) and experimental tests to prove the efficiently and validity of the predicting model. 相似文献
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Lijuan Liao Takashi Kobayashi Toshiyuki Sawa Yasuhiro Goda 《International Journal of Adhesion and Adhesives》2011,31(7):612-619
The stress wave propagations and interface stress distributions in the single-lap adhesive joint under impact tensile loads are analyzed using the three-dimensional finite element method (3D-FEM) taking into account the strain rate sensitive of the adhesive using Cowper–Symonds constitutive model. It is found that the rupture of the joint initiates near the middle area of the edges of the interfaces along the width direction. In addition, the effects of Young's modulus of the adherend, the overlap length and the thickness of the adhesive layer, and the initial impact velocity of the impacted mass on the stress wave propagations and the interface stress distributions are examined. The characteristics are compared with those of the joint under static loads, which show the different properties. Furthermore, experiments are also carried out for measuring the strain responses and the joint strength. A fairly good agreement is observed between the numerical and the measured results. The strength of the single-lap adhesive joint, which is described using impact energy, is obtained between 5.439 and 5.620 J for the present joint. 相似文献
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Two-dimensional (plane-stress and plane-strain) theoretical models are presented for stress analysis of adhesively bonded single-lap composite joints subjected to either thermal or mechanical loading or a combination thereof. The joints consist of similar/dissimilar orthotropic or isotropic adherends and an isotropic adhesive interlayer. The governing differential equation of the problem is obtained using a variational method which minimizes the complementary strain energy in the bonded assembly. In this formulation, through-thickness variation of shear and peel stresses in the interlayer is considered. Both shear and normal traction-free boundary conditions are exactly satisfied. Peel and shear stresses obtained from plane-strain analytical models considering a homogeneous adhesive interlayer are in close agreement with those of the finite element predictions. A systematic parametric study is also conducted to identify an ideal set of geometric and material parameters for the optimal design of single-lap composite joints. 相似文献