Investigations on the Influence of High Pressures on the Curing Behaviour and Material Properties of Composite Structures for the Development of a Material Model
Investigations on the Influence of High Pressures on the Curing Behaviour and Material Properties of Composite Structures for the Development of a Material Model
复制标题
研究高压对复合结构固化行为和材料性能的影响，以开发材料模型
DOI：
10.1007/978-3-662-60809-8_26
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发表时间：
2020
期刊：
影响因子：
--
通讯作者：
Axel S.
中科院分区：
文献类型：
--
作者：
Gushurst;Nadine;Frerich;Herrmann;Axel S.
以往的研究表明，高压会影响环氧树脂的固化行为和力学性能。目前开发的复合材料零件制造过程的仿真方法没有考虑压力依赖性，因为过程压力通常较低。在最近的发展中，环氧树脂在高压下固化，例如在高压树脂传递模塑（HP-RTM）过程中。在本研究中，提出了一种模型方法，该方法通过增加现有的自由体积理论模拟方法来考虑压力的影响。可以证明，基于分数自由体积的材料特性描述是可能的，因此理论上可以通过自由体积将压力依赖性引入过程模拟。为了验证其实际意义，进行了实验研究，确定了压力对环氧树脂介电性能、转化率和玻璃化转变温度的影响。工艺压力的增加导致最终固化度、玻璃化转变温度和离子粘度的增加。高压对机械性能的影响，如弹性模量或断裂应力，无法通过拉伸试验证明。
Former investigations have shown, that high pressure influences the cure behaviour and mechanical properties of epoxy resins. Simulation approaches for manufacturing processes of composite parts developed so far do not consider pressure dependency, since process pressure is generally low. In recent developments, curing of epoxy resin under high pressure occurs, for example during the high-pressure resin transfer moulding (HP-RTM) process. In this study, a model approach is presented, which considers the effect of pressure by augmenting an existing simulation approach using free-volume theory. It could be demonstrated, that a description of the material properties based on the fractional free volume is possible and thus the pressure dependency could be brought into the process simulation via free volume, in theory. In order to verify the practical relevance, experimental investigations were conducted to confirm an effect of pressure on dielectric properties, conversion and glass transition temperature of epoxy resins. An increase of process pressure leads to a higher final degree of cure, glass transition temperature and ion viscosity. The influence of high pressure on mechanical properties, such as elastic modulus or fracture stress could not be proven conducting tensile tests.
热固性固化过程中的应力
DOI：
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发表时间：
1998
期刊：
影响因子：
--
作者：
D. Adolf;James E. Martin;R. Chambers;S. Burchett;T. Guess
通讯作者：
T. Guess
夹层结构的细观制造过程模拟，用于分析粘弹性相关的残余应力
DOI：
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发表时间：
2012
期刊：
影响因子：
--
作者：
C. Brauner;T. B. Block;A. Herrmann
通讯作者：
A. Herrmann
基于自由体积的热固性固化行为建模方法
DOI：
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发表时间：
1990
期刊：
影响因子：
--
作者：
W. Sanford;R. Mccullough
通讯作者：
R. Mccullough