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产生这种特殊的波峰及过渡区是由于焊接过程中铝合金与钢之间的高速撞击使得两种金属发生剪切作用形成的，对于此剪切问题可以采用斯托克斯第一问题进行描述该物理过程，即空间内水平放置在液体上的静止的平板突然开始运动时，将带动平板下方的粘性流体一起运动。由于特殊波峰的高度与过渡区宽度一致，因此只要计算出粘性流体被带动的高度，即可计算出过渡区的宽度。 在磁脉冲焊接工艺中，同样的碰撞速度和搭接角度条件下，碰撞点的移动速度为定值，内、外管的碰撞速度约为10^2数量级，接头波波长为10^-2数量级，可见式中t与碰撞点移动速度成反比，过渡区的宽度与η和v有关。尽管本文将内、外管金属按流体进行分析，但是铝和铁的粘性系数还是远大于常见液体的粘性系数。研究表明，铝和铁在100GPa冲击压力下的剪切粘性系数分别为1000Pa•s和1200Pa•s。为确定参数η，取不同工艺参数条件下试样的过渡区宽度和速度进行计算，工艺参数如表所示，将各参数带入式中，可得不同试验条件下的η |
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真强必胜: 金币+1, 谢谢 2014-01-13 21:35:07
真强必胜: 金币+1, 谢谢 2014-01-13 21:35:07
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This special crest and the transition zone is due to the high-speed crash during welding between aluminium alloys and steel which made shearing formed of the two metals and the problem of this physical process can be described with Stokes' first problem. when stationary plate which is placed on the liquid level starts moving suddenly , will drive co-movement of viscous fluid at the bottom of the plate . Due to the special crest height is consistent with the width of the transition zone, the width of the transition zone can be calculated by the height of the driven viscous fluid . In the magnetic pulse welding process the moving speed of the impact point is constant with same impact speed and lap angle condition. The impact velocity of the outer tube is about 10 ^ 2 , wave length of the joint order of 10 ^ -2 , which means the collision point is inversely proportional to the moving speed and the width of the transitional zone is related to η and v .Although the inner and outer tube metals are equal to fluid for analysis here , the viscosity coefficient of the aluminum and iron is much larger than common viscosity liquids. Studies have shown that the shear viscosity coefficient of aluminum and iron in 100GPa impact pressure was 1000Pa • s and 1200Pa • s. The transition region width of the sample and speed under different process parameters is calculated to determine the parameter η . Certain η under different experimental conditions can be obtained when the process parameters shown in the table was taken into the equation 。 |
3楼2014-01-13 21:09:55
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真强必胜: 金币+1, 谢谢 2014-01-13 21:34:55
zoe122208: 金币+100, 翻译EPI+1, ★★★★★最佳答案 2014-01-14 07:15:57
真强必胜: 金币+1, 谢谢 2014-01-13 21:34:55
zoe122208: 金币+100, 翻译EPI+1, ★★★★★最佳答案 2014-01-14 07:15:57
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The reason why this kind of wave peaks and a transition area are resulted is due to the high speed impact, during the welding process, between the aluminum alloy and steel which causes shear between the two metals. For this shear problem Stokes First Theorem can be used to describe the physical process, i.e., when a stationary plate horizontally placed on the surface of a liquid starts to move, it will cause the viscous fluid below the plate to move along. As the amplitude of the special wave peaks is the same as the width of the transition area, this width can be calculated as soon as the height of fluid that is carried along is calculated. Within the technology of welding by magnetic pulse, under the same collision speed and joint angle, the speed of movement at collision point is a constant and the speed of impact between the inner and outer pipe is of an order of magnitude of 10^2 and the wavelength of the joint of 10^-2. Hence it can be seen that in the formula, t is inversely proportional to the speed of movement at the collision point and the width of transition area is related to η and v. Although the inner and outer metal pipes are treated as fluid in this paper, the viscosity coefficients of aluminum and steel are far greater than those of the most common liquids. This study shows that the shear viscosity coefficients of aluminum and steel under an impact pressure of 100GPa are 1000Pa•s and 1200Pa•s respectively. In order to determine the parameter η, calculations are done using widths of the transition area and speeds under different process conditions, with process parameter being given in the table and then η under different test conditions are obtained. 供参考，希望有帮助 |
2楼2014-01-13 20:50:28
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