Influence of temperature and strain rate on the mechanical behavior of three amorphous polymers: Characterization and modeling of the compressive yield stress
Influence of temperature and strain rate on the mechanical behavior of three amorphous polymers: Characterization and modeling of the compressive yield stress
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DOI：
10.1016/j.ijsolstr.2005.06.040
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发表时间：
2006-04-01
影响因子：
3.6
通讯作者：
Adharapurapu, RR
中科院分区：
文献类型：
--
作者：
Richeton, J;Ahzi, S;Adharapurapu, RR
对三种商用非晶聚合物：聚碳酸酯（PC）、聚甲基丙烯酸甲酯（PMMA）和聚酰胺酰亚胺（PAI）进行了单轴压缩应力应变试验。实验在很宽的温度范围（-40℃至180℃）和应变速率（0.0001 s（-1）至5000 s-1）下进行。采用改良的劈裂式霍普金森压杆进行高应变率试验。温度和应变速率对三种聚合物的力学响应影响较大。特别是，屈服应力随温度的降低和应变速率的增大而增大。根据基于应变速率/温度叠加原理的新合作模型，对大范围应变速率和温度下的压缩屈服应力实验数据进行了建模。合作模型的建模结果通过将屈服行为与β力学损失峰值相关的能量联系起来，为二次转变提供了证据。从建模的角度讨论了静水压力的影响。(c) 2005 Elsevier Ltd版权所有。
Uniaxial compression stress-strain tests were carried out on three commercial amorphous polymers: polycarbonate (PC), polymethylmethacrylate (PMMA), and polyamideimide (PAI). The experiments were conducted under a wide range of temperatures (-40 degrees C to 180 degrees C) and strain rates (0.0001 s(-1) up to 5000 s-1). A modified split-Hopkinson pressure bar was used for high strain rate tests. Temperature and strain rate greatly influence the mechanical response of the three polymers. In particular, the yield stress is found to increase with decreasing temperature and with increasing strain rate. The experimental data for the compressive yield stress were modeled for a wide range of strain rates and temperatures according to a new formulation of the cooperative model based on a strain rate/temperature superposition principle. The modeling results of the cooperative model provide evidence on the secondary transition by linking the yield behavior to the energy associated to the beta mechanical loss peak. The effect of hydrostatic pressure is also addressed from a modeling perspective. (c) 2005 Elsevier Ltd. All rights reserved.