固体推进剂HTPB双轴力学性能实验测量与模拟,Propellants, Explosives, Pyrotechnics

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固体推进剂HTPB双轴力学性能实验测量与模拟
Propellants, Explosives, Pyrotechnics ( IF 1.7 ) Pub Date : 2023-10-24 , DOI: 10.1002/prep.202300157
Li Jin ₁ , Wei‐Xin Yan ₁ , Qin‐Zhi Fang ₁ , Yang Li ₁ , Qin‐Wei Hu ₁

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端羟基聚丁二烯（HTPB）固体推进剂因其优异的机械性能而广泛应用于运载火箭和导弹。HTPB材料在制造、储存和运输过程中承受着复杂的载荷。因此，HTPB的力学性能对结构的安全性和使用寿命具有重要影响。本工作的目的是通过合适的双向拉伸试样和高体积分数三维颗粒填充模型，研究不同加载比例和加载速度对端羟基聚丁二烯（HTPB）固体推进剂双向拉伸的影响。材料。研究设计并采用了合适的双轴拉伸试件，通过在每个加载方向上作用载荷，可以获得其中心部分的应力，并通过数字图像相关（DIC）获得其中心部分的应变方法。通过实验可以得到各方向的应力应变关系。实验结果表明，加载速度显着影响HTPB推进剂在室温和不同加载比例下的双向拉伸行为。有限元模拟结果验证了双轴实验的准确性。根据实验结果，对双轴实验中颗粒脱粘进行了分析，提出了等效泊松比参数来评价脱粘程度。高体积分数三维颗粒填充模型为实验结果提供了良好的模拟，等效泊松比参数可以方便、准确地判断颗粒的脱粘情况，对HTPB固体推进剂的结构完整性评估具有重要意义。

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Experimental measurement and simulation of the biaxial mechanical properties of solid propellant HTPB

Hydroxyl-terminated polybutadiene (HTPB) solid propellant was widely used in carrier rocket and guided missiles, owing to its excellent mechanical properties. The material of HTPB subjected to complex load such as in the process of manufacturing, storage and transportation. Therefore, the mechanical properties of HTPB had important implications for the safety of structure and service life. The purpose of this work is to study the effects of different loading ratios and loading speeds on the biaxial tension of hydroxyl-terminated polybutadiene (HTPB) solid propellant with a proper kind of biaxial tensile specimen and a high volume fraction three dimensional particle filling model of the material. The proper kind of biaxial tensile specimen with which the stresses in its central part could be obtained with the loads acted on each loading direction was designed and used in the study, and the strains in its central parts were obtained with digital image correlation (DIC) method. The stress-strain relationship at each direction could be obtained by experiments. Experimental results indicated that the loading speed remarkably influenced the biaxial tensile behaviors of HTPB propellant at room temperature and at different loading ratios. The finite element simulation results demonstrated the accuracy of the biaxial experiment. Based on the experimental results, the particle debonding in biaxial experiments were analyzed and an equivalent Poisson's ratio parameter was proposed to evaluate the degree of debonding. The highly volume fraction three dimensional particle filling model provides a good simulation with experimental results and the equivalent Poisson's ratio parameter can conveniently and accurately determine the debonding of particles which is meaningful to the structure integrity assessment of HTPB solid propellant.

更新日期：2023-10-24

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