Constitutive Modelling of the Glass Transition and Related Phenomena: Relaxation of Shear Stress Under Pressure

Constitutive Modelling of the Glass Transition and Related Phenomena: Relaxation of Shear Stress Under Pressure
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玻璃化转变及相关现象的本构模型:压力下剪切应力的松弛

DOI:
10.1007/978-981-10-0959-4_6
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发表时间:
2016
期刊:
影响因子:
--
通讯作者:
Mittermeier
Mittermeier
中科院分区:
--
文献类型:
--
作者:
Johlitz;Mittermeier

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相似文献

在工业制造过程中,以及在聚合物零件的许多应用中,玻璃化转变起着重要作用。这是由于高机械加工速度,高温或大冷却速率。聚合物的力学、热力学和热性能在玻璃化转变以下和以上是不同的,这是一种热粘弹性现象。它取决于聚合物的固有时间尺度与热机械加载过程的固有时间尺度的比值。如果两个尺度相当,则材料处于玻璃化过渡区。否则它就处于平衡态或玻璃态。在工业中,有越来越多的需求来模拟制造过程,以便在制造之前估计聚合物部件的最终行为。为此,需要有限热粘弹性的本构模型,它既能代表聚合物的体积力学行为,也能代表聚合物的等时力学行为,并结合热力学性能和热力学性能。在最近的一篇论文中,作者提出了混合自由能的概念。这种方法将应用于当前的文章中,在剪切变形下的压力相关松弛行为是感兴趣的。
In industrial fabrication processes as well as in many applications of polymer parts, the glass transition plays a significant role. This is due to high mechanical processing speeds, high temperatures or large cooling rates. The mechanical, the thermomechanical and the caloric properties of polymers differ below and above the glass transition which is a thermoviscoelastic phenomenon. It depends on the ratio between the intrinsic time scale of the polymer and that of the thermomechanical loading process. If both scales are comparable, the material is in the glass transition region. Otherwise it is in the equilibrium or in the glassy region. In the industry, there are increasing demands to simulate fabrication processes in order to estimate the resulting behaviour of the polymer parts before they are manufactured. To this end, constitutive models of finite thermoviscoelasticity are needed which can represent the volumetric as well as the isochoric mechanical behaviour of the polymer in combination with the caloric and the thermomechanical properties. In a recent paper of the authors, the concept of a hybrid free energy has been developed. This approach will be applied in the current essay where the pressure-dependent relaxation behaviour under shear deformations is of interest.
基于取决于压力、等容变形和温度的混合自由能密度的热机械材料建模
DOI: 10.1016/j.ijsolstr.2013.10.036
发表时间: 2014
影响因子: 3.6
作者:
Dippel
通讯作者: Dippel
DOI: --
发表时间: 2012
期刊:
影响因子: --
作者:
T. Naumann;M. Stommel
通讯作者: M. Stommel
聚合物中历史相关现象的描述:模量、热膨胀系数和热容的玻璃化转变
DOI: --
发表时间: 2011
期刊:
影响因子: --
作者:
J. Peters;O. Estorff;A. Lion
通讯作者: A. Lion