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實(shí)際上電磁焊接兩管之間發(fā)生碰撞不是絕對(duì)的平面與平面碰撞。如果考慮更加細(xì)微的情況，或者考慮角度問(wèn)題，則理論分析較為困難。因此在本文中，我們把磁脈沖焊接內(nèi)管受力問(wèn)題轉(zhuǎn)化為圓環(huán)受到外界均勻作用力問(wèn)題。 在本文研究?jī)?nèi)容中，內(nèi)管材料20#Fe不允許有大的塑性變形，因此需要有足夠強(qiáng)的厚度以保證足夠的剛度防止焊接失效，20#Fe的塑性變形行為不在我們的研究范圍內(nèi)。我們將外管3A21的動(dòng)態(tài)力學(xué)性能刪除了。同時(shí)，添加了20#鋼在動(dòng)態(tài)載荷下的屈服強(qiáng)度的得出過(guò)程。 根據(jù)文獻(xiàn)可知，在超高沖擊載荷下，材料的動(dòng)態(tài)屈服強(qiáng)度和準(zhǔn)靜態(tài)下的屈服強(qiáng)度之比可能在1~100之間，鋼在受到幾百米速度沖擊時(shí)動(dòng)態(tài)屈服強(qiáng)度相比準(zhǔn)靜態(tài)屈服強(qiáng)度可以增加4倍左右�；诖�，我們首先通過(guò)試驗(yàn)來(lái)獲得某一條件下的臨界厚度，之后將臨界厚度和沖擊壓力帶入到公式中先計(jì)算出鋼在這一條件下的動(dòng)態(tài)屈服強(qiáng)度，約為1GPa左右（為準(zhǔn)靜態(tài)條件下的3倍），再將該屈服強(qiáng)度作為計(jì)算其他臨界厚度時(shí)20#鋼在其他沖擊條件下的依據(jù)，最終得出不同放電電壓（不同沖擊速度）下的臨界厚度。 |
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武漢一心一譯 
捐助貴賓 (著名寫(xiě)手)
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- 專業(yè): 高分子合成化學(xué)
【答案】應(yīng)助回帖
商家已經(jīng)主動(dòng)聲明此回帖可能含有宣傳內(nèi)容|
實(shí)際上 電磁焊接 兩管之間 發(fā)生碰撞 不是絕對(duì) 的平面與平面碰撞。如果 考慮更加細(xì)微 的情況，或者 考慮 角度問(wèn)題，則 理論分析 較為困難。因此 在本文中，我們 把磁脈沖焊接 內(nèi)管 受力問(wèn)題 轉(zhuǎn)化為 圓環(huán) 受到 外界均勻作用力 問(wèn)題。 在本文研究?jī)?nèi)容中，內(nèi)管材料 20#Fe 不允許 有大的 塑性變形，因此 需要有 足夠強(qiáng)的厚度 以保證 足夠的 剛度 防止焊接失效，20#Fe 的塑性變形行為 不在我們的 研究范圍內(nèi)。我們 將外管 3A21的 動(dòng)態(tài)力學(xué)性能 刪除了。同時(shí)，添加了 20# 鋼 在 動(dòng)態(tài)載荷下 的屈服強(qiáng)度 的得出過(guò)程。 In a practical case, the inter tube collision during electromagnetic welding process is not an absolutely plane to plane collision. In fact, if taking more subtle conditions or angle issues into consideration, pure theoretical analysis can hardly explain such collision. As a result, in this paper the inner tube stress problem during magnetic pulse welding was converted into the uniform force acting on an annulus. In the research content of this paper, no large plastic deformations were allowed to emerge in inner tube material (20#Fe), therefore we need to secure enough thickness of tube to provide sufficient rigidity in case of wielding failure, 20#Fe plastic deformations were not within our research scope. we deleted the dynamic mechanical property of external tube 3A21, while added the calculation process of yield strength of 20# steel under the condition of dynamic load. |
2樓2015-07-01 10:15:33
青草離離
木蟲(chóng) (著名寫(xiě)手)
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【答案】應(yīng)助回帖
★ ★ ★ ★ ★
zoe122208: 金幣+5, ★★★很有幫助 2015-07-01 21:08:49
zoe122208: 金幣+5, ★★★很有幫助 2015-07-01 21:08:49
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In fact collision between electromagnetic welding pipe is not absolute plane and plane collision.If you consider a more subtle, or consider Angle problem, theory analysis more difficult.So in this article, we put the magnetic pulse welding tube stress problem into a circle by uniform external forces.In this paper the research content, the inner tube material # 20 Fe is not allowed to have a large plastic deformation, so you need to have a strong enough in order to assure enough stiffness to prevent welding failure, the thickness of plastic deformation behavior of 20 # Fe is beyond the scope of our research.We will pipe outside the dynamic mechanical properties of 3 a21 deleted.At the same time, add the 20 # steel yield strength under dynamic load of process are obtained. According to the literature, under the high impact load, the dynamic yield strength of material and the ratio of yield strength under quasi-static may be between 1 and 100, steel in a hit from a few hundred meters speed dynamic yield strength compared to quasi static yield strength increases about four times.Based on this, we first through the test to get under the condition of a certain critical thickness, then the critical thickness and the shock pressure into the formula to calculate the steel under the condition of the dynamic yield strength, about 1 gpa (standard under the condition of static 3 times), then the yield strength for other critical thickness calculation of 20 # steel under the condition of other impact, finally it is concluded that different discharge voltage under different impact speed) (critical thickness. |
3樓2015-07-01 10:25:30
武漢一心一譯
捐助貴賓 (著名寫(xiě)手)
- 翻譯EPI: 502
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- 蟲(chóng)號(hào): 3587652
- 注冊(cè): 2014-12-10
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- 專業(yè): 高分子合成化學(xué)
【答案】應(yīng)助回帖
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★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ...
zoe122208: 金幣+95, 翻譯EPI+1, ★★★★★最佳答案 2015-07-01 21:08:42
zoe122208: 金幣+95, 翻譯EPI+1, ★★★★★最佳答案 2015-07-01 21:08:42
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根據(jù)文獻(xiàn) 可知，在超高 沖擊載荷下，材料的 動(dòng)態(tài)屈服強(qiáng)度 和 準(zhǔn)靜態(tài)下的 屈服強(qiáng)度 之比 可能在1~100之間，鋼在 受到 幾百米速度 沖擊時(shí) 動(dòng)態(tài)屈服強(qiáng)度 相比準(zhǔn)靜態(tài)屈服強(qiáng)度 可以 增加4倍左右�；诖�，我們 首先 通過(guò)試驗(yàn) 來(lái)獲得 某一條件下的 臨界厚度，之后 將臨界厚度 和沖擊壓力 帶入到 公式中 先計(jì)算出 鋼在這一條件下的 動(dòng)態(tài)屈服強(qiáng)度，約為1GPa左右（為準(zhǔn)靜態(tài)條件下 的3倍），再將該 屈服強(qiáng)度 作為 計(jì)算 其他臨界厚度時(shí) 20#鋼 在其他沖擊條件下 的依據(jù)，最終得出 不同放電電壓（不同沖擊速度）下的 臨界厚度。 According to relevant literatures, we can learn that under ultrahigh impulse load, the ratio between material dynamic yield strength and quasi-static yield strength can be 1~100. Under the shock of several hundred meters speed, the material yield strength can increase by approximately 4 times. On this basis, firstly we made an experiment and obtained a material critical thickness under certain condition; then we put this critical thickness and the shock pressure into equation to calculate the dynamic yield strength under such condition, and the result was about 1GPa ( 3 times bigger than the that under quasi-static condition), based on which, we calculated other critical thicknesses of the 20# steel under various discharge voltages (various impact velocities ). |
4樓2015-07-01 10:45:31
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