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拼焊板焊缝方向对其单向拉伸性能的影响研究 总被引:2,自引:0,他引:2
为提高拼焊板成形性,用单拉实验来研究拼焊板焊缝方向对其拉伸性能的影响.采用解析、实验和有限元法研究了拼焊板焊缝方向对其综合延伸率、失效模式的影响.结果表明,当焊缝角度较小时,失效表现为焊缝开裂;随着焊缝角度增大,平均延伸率非线性减小,且变化速率逐渐减小.当焊缝角度超过一定值后,失效变为薄侧母材开裂,并随着焊缝角度增大拼焊板综合延伸率逐渐增大,且增大的速率逐渐减小.在失效模式转换时,焊缝角度相应存在一个临界点,这一临界角度大小主要依赖于焊缝和薄侧母材性能.适当的焊缝角度有利于拼焊板成形性能的提高和失效模式的控制. 相似文献
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焊缝对拼焊板成形性能的影响 总被引:5,自引:0,他引:5
邱晓刚 《理化检验(物理分册)》2005,41(4):166-170
采用激光焊接技术对冷轧薄钢板进行拼焊,通过对拼焊板进行拉伸试验和模拟成形性能试验,研究分析了焊缝对拉伸性能参数和成形性能参数的影响,比较了拼焊板与母材性能的差异,分析了强度比和厚度比对塑性变形的影响及应变分布。 相似文献
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Tensile Fracture Location Characterizations of Friction Stir Welded Joints of Different Aluminum Alloys 总被引:3,自引:0,他引:3
The tensile fracture location characterizations of the friction stir welded joints of the AA1050-H24 and AA6061-T6 Al alloys were evaluated in this study. The experimental results show that the fracture locations of the joints are different for the different Al alloys, and they are affected by the FSW parameters. When the joints are free of welding defects, the AA1050-H24 joints are fractured in the HAZ and TMAZ on the AS and the fracture parts undergo a large amount of plastic deformation, while the AA6061-T6 joints are fractured in the HAZ on the RS and the fracture surfaces are inclined a certain degree to the bottom surfaces of the joints. When some welding defects exist in the joints, the AA1050-H24 joints are fractured on the RS or AS, the AA6061-T6 joints are fractured on the RS, and all the fracture locations are near to the weld center. The fracture locations of the joints are dependent on the internal structures of the joints and can be explained by the microhardness profiles and defect morpho 相似文献
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The thermal effect of microcantilever-DNA biosensors is investigated by the energy method. Based on a liquid crystal theory for DNA solutions and a two-variable method for laminated cantilevers, an analytical model for nanomechanical cantilever motion under the combination of bio-interactions and thermal loadings is provided and then it is extended to T-shaped cantilevers. Then, the effects of chemo-physical properties of DNA biofilm (i.e., grafting density, nucleotide number, and ionic strength) and temperature change on deflections are discussed. In order to reduce noise signals, the controlling temperature and size optimization of cantilevers with different substrate materials and ionic strengths are also studied. Results show that SU-8 polymer cantilevers can preserve the sensitivity of molecule adsorption and thermal stability, which agrees well with the related experiments; the layer-to-layer thickness ratio of SU-8 polymer cantilevers should be as small as possible, while for silicon nitride cantilevers, there exists an optimal value. These results help to understand the sensitivity and reproducibility of biosensors. 相似文献
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This paper reports the effect of friction stir welding(FSW)process parameters on tensile strength of cast LM6 aluminium alloy.Joints were made by using dierent combinations of tool rotation speed,welding speed and axial force each at four levels.The quality of weld zone was investigated using macrostructure and microstructure analysis.Tensile strength of the joints were evaluated and correlated with the weld zone hardness and microstructure.The joint fabricated using a rotational speed of 900 r/min,a weldin... 相似文献
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An Analytical Circuit Model of Switched Reluctance Motors 总被引:1,自引:0,他引:1
《IEEE transactions on magnetics》2009,45(12):5368-5375
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Correas A. Chao Crespo A. Casares Ghasemnejad H. Roshan G. 《Applied Composite Materials》2021,28(4):1237-1254
Applied Composite Materials - This paper aims to develop an analytical method to predict the low-velocity impact response of simply supported stringer stiffened panels. Since the combination of... 相似文献