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爆炸复合的研究现状和发展趋势 总被引:10,自引:1,他引:9
综述了爆炸复合的科技问题,着重介绍了爆炸复合的冶金效应和连接界面。还介绍了爆炸复合的基本的物理原理、应用研究以及工业应用。最后指出了爆炸复合理论及爆炸复合技术发展的最新动向。 相似文献
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高聚物夹层材料对层压减振复合钢板拉伸剪切强度的影响 总被引:1,自引:0,他引:1
研究了高聚物夹层材料对层压减振复合钢板的拉伸剪切强度的影响。结果指出,高聚物夹层材料较厚时,层压减振复合钢板的拉伸剪切变形规律与高聚物夹层材料的一致;高聚物夹层厚度较小时,复合钢板的拉伸剪切强度较高。与酚醛树脂氯丁橡胶相比,聚氨酯作夹层的层压减振复合钢板具有较高的拉伸剪切强度。 相似文献
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用爆炸法消除CF钢焊接残余应力可行性研究 总被引:1,自引:0,他引:1
对38mm厚CF烟焊接接头进行爆炸消除残余应力可行性试验,为使用调质钢建造的大型焊接结构消除焊接残余应力提供可行的工程方法。CF钢焊后存在很高的拉伸残余应力,爆炸处理可有效地消除残余应力;经爆炸处理后,CF钢除硬度有一定的提高外,其余常规力学性能不变。 相似文献
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Investigation of explosive welding parameters and their effects on microhardness and shear strength 总被引:2,自引:0,他引:2
The aim of this study was to investigate the strength of explosive welded metals with the same chemical compositions. Different welding interfaces (straight, wavy and continuous solidified-melted) were used with changing explosive welding parameters [stand-off distance (s), explosive loading (R) and anvils]. Joined metals were investigated under heat-treated and untreated conditions. Results on the microstructure, microhardness, tensile shear strength and bending tests are reported. According to the experimental results, the effect of the anvil on the explosive welding process was only the joining or not-joining performance. It was shown that the bonding interface changed from a straight to a wavy structure when the explosive loading and stand-off distance were increased. For wavy interfaces, when the explosive loading was increased the wavy length and amplitude increased. Results of tensile shear and bending tests showed that heat-treated specimens have more strength than untreated samples. According to tensile shear test results, straight and wavy interfaces had similar strength. In addition, in bending tests of untreated specimens it was shown that the bending zone had some cracks. 相似文献
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Fatigue strength of self‐piercing riveted joints in lap‐shear specimens of aluminium and steel sheets
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C.‐S. Chung H.‐K. Kim 《Fatigue & Fracture of Engineering Materials & Structures》2016,39(9):1105-1114
The self‐piercing riveting (SPR) process is gaining popularity because of its many advantages. This study investigated the fatigue strength of SPR joints in tensile‐shear specimens with dissimilar Al‐5052 and steel sheets. A structural analysis of the specimen was conducted. For this specimen, the upper steel sheet withstood applied load in a monotonic test and played a major role in the low‐cycle region. In the high‐cycle region, however, the harder surface of the upper steel sheet reduced the fatigue strength by enhancing fretting crack initiation on the opposite softer aluminium surface. Therefore, the fatigue endurance of the specimen was reduced. The fatigue endurance of a SPR joint with the combination of steel and aluminium sheets was found to be governed by the strength of the lower sheet, which is more vulnerable to the applied loading. Thus, it is desirable to use a stronger metal sheet as the lower sheet with regard to the fatigue performance. Scanning acoustic microscopy was effectively used to reveal and prove the formation and growth of subsurface cracks in SPR joints. The structural stress can predict the fatigue lifetimes of the SPR joint specimens within a factor of three. 相似文献
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新型“大气泡能”概念武器在水下爆炸能产生大气泡,对船体总纵强度造成很大影响,有可能使舰体发生纵向折断或倾覆。为研究这种作用,建立了舰船静置爆炸气泡时总纵弯曲强度的理论计算方法。采用静置爆炸气泡的假设,将气泡产生的浮力损失和压力差转化为等效载荷,计算气泡作用后船体的总纵弯矩和剪力并进行强度校核。以某舰艇为例进行计算,结果表明,爆炸气泡作用下船体的剪力和弯矩比静浮状态增大很多,船体发生纵向折断破坏的危险性也随之增大。 相似文献
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This paper focuses on the simulation of welding residual stresses and the action of explosion shock waves on welding residual
stresses. Firstly, the distributions of welding temperature field and residual stress on a butt joint were numerically simulated
with the sequentially coupled method. Secondly, the effect of explosion shock waves, produced by plastic strip-like explosive,
on welding residual stress distribution was predicted with coupled Lagrange-ALE algorithm. It was implicated that explosion
treatment could effectively reduce welding residual stresses. The simulation work lays a foundation for the further research
on the rule of explosion treatment’s effect on welding residual stresses and the factors that may influence it. 相似文献
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R. Pollak A. Palazotto T. Nicholas 《Mechanics of materials : an international journal》2006,38(12):1170-1181
A critical evaluation of the statistics of the fatigue strength distribution as determined by the staircase (or up-and-down) method is presented. The effects of test parameters (namely, step size and sample size) were analyzed using numerical simulation to determine the accuracy of fatigue strength standard deviation calculations using traditional staircase statistics, resulting in a quantification of standard deviation bias as a function of step size and sample size. A non-linear correction was formulated to mitigate this standard deviation bias inherent in small-sample tests. In addition, the simulation was used to investigate the effectiveness of a bootstrapping algorithm on standard deviation estimates. The bootstrapping algorithm was found to significantly reduce the potential of large standard deviation errors in small-sample tests. Together, the use of the non-linear correction factor and the bootstrapping algorithm may allow an improved method to estimate the statistics of a material’s fatigue strength distribution using a small-sample staircase test strategy. 相似文献
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To assess the bonding quality between the different layers of composite rings fabricated by filament winding it is necessary to choose a useful shear test. A method for measuring the shear strength of thin curved samples is proposed herein. Stress distribution within the probe is calculated and evaluated by finite element method. 相似文献
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High density Mo-Cu composite and Cr18-Ni8 stainless steel were brazed with Ag-Cu filler metal in vacuum of 10−5 Pa. The microstructure characteristics of Mo-Cu/Cr18-Ni8 brazed joint were investigated by field-emission scanning electron microscope (FESEM) with energy dispersive spectrometer (EDS) and shear strength was measured by shearing test. The results indicated that a Mo-Cu/Cr18-Ni8 joint with shear strength of 125 MPa was obtained at 940 °C for 20 min. There were Ag-Cu eutectic and Cu-rich phase without brittle intermetallic compounds formed in the joint. The shear fracture exhibited plastic feature with shear dimple and fracture located at the interface between braze seam and Cr18-Ni8 stainless steel. 相似文献