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| 聚合物的应力松弛过程主要表现为高分子链段的运动和重排以及键角的改变。从高聚物分子链段运动理论来说，高聚物应力松弛实际上是其分子链段沿着外力的方向作运动以减小或消除应力的过程，分子链段运动快慢直接制约应力松弛速率的大小。在应力松弛试验过程中，初始加载时试样产生的形变主要包括两部分：键长键角变化的普通弹性形变和高分子链段运动变化的高弹形变。试样的初始形变主要为普通弹性形变，普通弹性形变的模量很高。在初始形变自发回弹的内应力的作用下，随着时间的延长，那些拉伸时间较长的链段，先后沿着力的方向逐渐由卷曲分子构象向伸展分子构象运动，发展成为高弹形变。由于高弹形变模量远低于普通弹性形变模量，使得试样内维持相同应变的内应力减小，发生了应力松弛。由于高弹形变逐渐取代了普通弹性形变，宏观上就观察到了应力随时间的增加而减小的现象，随着观察时间的延长，应力松弛发展到与恒定应变相平衡的应力值时，应力松弛将停止达到稳定。 |
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lpszk
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删除！ [ Last edited by qingfeng877680 on 2009-10-10 at 20:09 ] |
4楼2009-09-13 20:18:26
lpszk
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yusongpan(金币+1,VIP+0):没有翻译 9-12 09:03
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| 到这个网站去会帮助你翻译：http://essaystar.com/Register.html?f=443 |
2楼2009-09-11 09:54:00
3楼2009-09-12 09:07:53
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yusongpan(金币+1,VIP+0): 9-18 09:40
yusongpan(金币+5,VIP+0): 9-18 09:41
yusongpan(金币+1,VIP+0): 9-18 09:40
yusongpan(金币+5,VIP+0): 9-18 09:41
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部分你的修改一下，摘要毕竟很重要 The stress relaxation process of polymer is mainly for polymer chains and rearrangement of movement and key Angle of change. From the theory of sport polymers for chain, polymer stress relaxation is actually the molecular chain along the direction of force to do exercise to decrease or eliminate stress process, molecular chain directly restricts movement speed for the size of the stress relaxation rate. In the stress relaxation process of test sample loading, when the initial deformation produced mainly includes two parts: the key of ordinary long horn changes that elastic deformation and polymer chain period of high elastic deformation motion changes. The initial deformation sample for ordinary elastic deformation, ordinary elastic deformation modulus is very high. In the initial deformation of spontaneous rebound, under the action of stress with the extension of time, the long chain tension, successively gradually from the direction of the effort to extend molecular conformation curly conformation movement, high elastic deformation become. Due to the high elastic deformation modulus far below normal elastic deformation modulus, maintain the same sample of stress, strain and stress relaxation happened. Due to the high elastic deformation gradually replaced the ordinary elastic deformation, stress on the macro was observed with time and reduce the phenomenon, as observed the extension of time, the stress relaxation development should be balanced with the constant disguised stress value of the stress relaxation will stop, achieve stability. |
5楼2009-09-14 08:08:37