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首页> 外文会议>Seminar on New Trends in Research of Energetic Materials;NTREM '10 >Viscoplastic behavior of solid propellants
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Viscoplastic behavior of solid propellants

机译：固体推进剂的粘塑性行为

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In the paper an initial attempt to the experimental analysis of viscous effects, characteris-tic for homogeneous solid rocket fuels is proposed. For this reason uniaxial tensile ex-periments, carried out on dumbbell homogeneous solid propellants have been chosen. Laboratory tests have been carried out on INSTRON tensile testing machine. Research schedule involved destructive tensile tests with various strain rates. Three different values of strain rates have been taken into considerations. Experimentally obtained hardening curves are presented in suitable diagrams.Basing on obtained results, authors confirm the viscoplastic behavior of previously men-tioned materials. Essential impact of the applied strain rate on the position of experimen-tal hardening curves is observed. Acquired results are the base for the further stage of in-vestigations of homogeneous solid propellants - modeling of their physical properties.Additionally, in the paper some numerical modelling, using the viscoplastic Chaboche's model identified basing on the experimental data is presented. The material parameters of the constitutive law are determined numerically using the evolutionary algorithm proce-dure. The efficiency of the model and the identification approach are discussed.
机译：在本文中，提出了对粘性效应进行实验分析的初步尝试，该特性是均质固体火箭燃料的特征。由于这个原因，已经选择了对哑铃均质固体推进剂进行的单轴拉伸试验。实验室测试已在INSTRON拉伸试验机上进行。研究计划涉及具有各种应变率的破坏性拉伸试验。已经考虑了三种不同的应变率值。实验获得的硬化曲线在合适的图中显示。 根据获得的结果，作者确认了之前提到的材料的粘塑性行为。观察到施加的应变速率对实验硬化曲线位置的本质影响。获得的结果是对均质固体推进剂进行进一步研究的基础-对其物理性质进行建模。 另外，在本文中，提出了一些数值模型，使用基于实验数据确定的粘塑性Chaboche模型。本构定律的物质参数是使用进化算法过程以数值方式确定的。讨论了模型的有效性和识别方法。

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