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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.
2Â¥2015-07-01 10:15:33
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zoe122208: ½ð±Ò+5, ¡ï¡ï¡ïºÜÓаïÖú 2015-07-01 21:08:49
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.
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3Â¥2015-07-01 10:25:30
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zoe122208: ½ð±Ò+95, ·­ÒëEPI+1, ¡ï¡ï¡ï¡ï¡ï×î¼Ñ´ð°¸ 2015-07-01 21:08:42
¸ù¾ÝÎÄÏ× ¿ÉÖª£¬ÔÚ³¬¸ß ³å»÷ÔØºÉÏ£¬²ÄÁ쵀 ¶¯Ì¬Çü·þÇ¿¶È ºÍ ×¼¾²Ì¬Ï嵀 Çü·þÇ¿¶È Ö®±È ¿ÉÄÜÔÚ1~100Ö®¼ä£¬¸ÖÔÚ Êܵ½ ¼¸°ÙÃ×ËÙ¶È ³å»÷ʱ ¶¯Ì¬Çü·þÇ¿¶È Ïà±È×¼¾²Ì¬Çü·þÇ¿¶È ¿ÉÒÔ Ôö¼Ó4±¶×óÓÒ¡£»ùÓÚ´Ë£¬ÎÒÃÇ Ê×ÏÈ Í¨¹ýÊÔÑé À´»ñµÃ ijһÌõ¼þÏ嵀 ÁÙ½çºñ¶È£¬Ö®ºó ½«ÁÙ½çºñ¶È ºÍ³å»÷ѹÁ¦ ´øÈëµ½ ¹«Ê½ÖÐ ÏȼÆËã³ö ¸ÖÔÚÕâÒ»Ìõ¼þÏ嵀 ¶¯Ì¬Çü·þÇ¿¶È£¬Ô¼Îª1GPa×óÓÒ£¨Îª×¼¾²Ì¬Ìõ¼þÏ µÄ3±¶£©£¬ÔÙ½«¸Ã Çü·þÇ¿¶È ×÷Ϊ ¼ÆËã ÆäËûÁÙ½çºñ¶Èʱ 20#¸Ö ÔÚÆäËû³å»÷Ìõ¼þÏ µÄÒÀ¾Ý£¬×îÖյóö ²»Í¬·Åµçµçѹ£¨²»Í¬³å»÷ËÙ¶È£©Ï嵀 ÁÙ½çºñ¶È¡£
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 ).
4Â¥2015-07-01 10:45:31
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