USE OF A MATHEMATICAL MODEL TO DESCRIBE ISOTHERMAL STRESS-STRAIN CURVES IN GLASSY THERMOPLASTICS
USE OF A MATHEMATICAL MODEL TO DESCRIBE ISOTHERMAL STRESS-STRAIN CURVES IN GLASSY THERMOPLASTICS
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DOI：
10.1098/rspa.1968.0029
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发表时间：
1968-01-01
影响因子：
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通讯作者：
THACKRAY, G
中科院分区：
文献类型：
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作者：
HAWARD, RN;THACKRAY, G
提出了一个新的模型来描述高聚物在玻璃化过渡点以下可以观察到的大可采扩展。该模型由Hookean弹簧串联、Eyring阻尼器和橡胶弹性弹簧并联组成。硝酸纤维素、醋酸纤维素片材和pvcare的常规应力-应变曲线与模型预测结果进行了比较。用这种方法可以说明塑料的应力-应变曲线的许多特征。根据该模型讨论了不同聚合物的应力-应变曲线之间的差异，并指出在试验条件下，聚合物出现缩颈的趋势与极限网络应变（极限伸长）有关。
A new model is proposed to describe the large recoverable extensions which can be observed with high polymers below their glass transition points. The model consists of a Hookean spring in series with an Eyring dashpot and rubber elasticity spring in parallel. Conventional stress-strain curves for cellulose nitrate and cellulose acetate sheet andPVCare compared with those predicted by the model. In this way many of the characteristic features of the stress-strain curves of plastics can be illustrated. Differences between the stress-strain curves of a number of polymers are discussed in terms of the model, and the tendency of a polymer to show necking is related to the ultimate network strain (limiting elongation) under the conditions of the test.