高分子材料の応力・ひずみ挙動における時間-温度換算特性
高分子材料の応力・ひずみ挙動における時間-温度換算特性
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高分子材料应力/应变行为的时温转换特性
DOI：
10.1299/kikaia.64.2087
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发表时间：
1998
期刊：
影响因子：
--
通讯作者：
Y. Tsuda
中科院分区：
文献类型：
--
作者：
T. Hiroe;H. Matsuo;K. Fujiwara;Y. Tsuda
在高密度聚乙烯柱样的基础上，对聚丙烯柱样和聚碳酸酯柱样进行了单调压缩加载和松弛试验，应变速率为1.1×10-1 ~ 1.1×10-5S-1，温度为10℃、25℃和40℃。利用基于超应力的本构模型成功地模拟了三种工程塑料的应力-应变响应。对这种应力-应变行为的研究表明，应变率和温度对速率相关变形的影响使用统一的参数表示，并且一个温度下的粘塑性行为可以仅通过时间尺度的变化与另一个温度下的粘塑性行为相关联。结果表明，在试验条件范围内，时间-温度等效的概念适用于这些固体聚合物，利用等效时间重构的粘塑性本构模型能够较好地推导出时变温度条件下的变形行为。
Monotonic compressive loading and relaxation tests are conducted at the strain rates of 1.1×10-1∼1.1×10-5S-1 and the temperature of 10, 25 and 40°C for the column specimens of polypropylene and polycarbonate following the previous study for high-density polyethylene. The observed stress-strain responses for the three engineering plastics are simulated successfully using the constitutive model based on overstress. The examination of such stress-strain behavior reveals that the effects of the strain-rates and the temperatures on the rate-dependent deformations are expressed using a unified parameter and that the viscoplastic behavior at one temperature can be related to that at another temperature by a change in the time scale only. This results indicate that the concept of timetemperature equivalence is applicable to these solid polymers within the range of test conditions, and the reconstructed viscoplastic constitutive model with use of the equivalent time has produced the deformation behavior under time-varying temperature conditions demonstratively.