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zoe122208木蟲 (正式寫手)
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產(chǎn)生這種特殊的波峰及過渡區(qū)是由于焊接過程中鋁合金與鋼之間的高速撞擊使得兩種金屬發(fā)生剪切作用形成的，對于此剪切問題可以采用斯托克斯第一問題進行描述該物理過程，即空間內(nèi)水平放置在液體上的靜止的平板突然開始運動時，將帶動平板下方的粘性流體一起運動。由于特殊波峰的高度與過渡區(qū)寬度一致，因此只要計算出粘性流體被帶動的高度，即可計算出過渡區(qū)的寬度。 在磁脈沖焊接工藝中，同樣的碰撞速度和搭接角度條件下，碰撞點的移動速度為定值，內(nèi)、外管的碰撞速度約為10^2數(shù)量級，接頭波波長為10^-2數(shù)量級，可見式中t與碰撞點移動速度成反比，過渡區(qū)的寬度與η和v有關(guān)。盡管本文將內(nèi)、外管金屬按流體進行分析，但是鋁和鐵的粘性系數(shù)還是遠大于常見液體的粘性系數(shù)。研究表明，鋁和鐵在100GPa沖擊壓力下的剪切粘性系數(shù)分別為1000Pa•s和1200Pa•s。為確定參數(shù)η，取不同工藝參數(shù)條件下試樣的過渡區(qū)寬度和速度進行計算，工藝參數(shù)如表所示，將各參數(shù)帶入式中，可得不同試驗條件下的η |
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真強必勝: 金幣+1, 謝謝 2014-01-13 21:34:55
zoe122208: 金幣+100, 翻譯EPI+1, ★★★★★最佳答案 2014-01-14 07:15:57
真強必勝: 金幣+1, 謝謝 2014-01-13 21:34:55
zoe122208: 金幣+100, 翻譯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. 供參考，希望有幫助 |
2樓2014-01-13 20:50:28
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真強必勝: 金幣+1, 謝謝 2014-01-13 21:35:07
真強必勝: 金幣+1, 謝謝 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樓2014-01-13 21:09:55
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