高围压下软端羟基聚丁二烯聚氨酯拉伸断裂机制与力学性能

郑佳乐; 张江涛; 周鹏; 费亦桐; 张梅; 翟鹏程

doi:10.14028/j.cnki.1003-3726.2026.26.068

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高围压下软端羟基聚丁二烯聚氨酯拉伸断裂机制与力学性能

研究论文 | 更新时间：2026-05-11

- 高围压下软端羟基聚丁二烯聚氨酯拉伸断裂机制与力学性能
- Tensile Fracture Mechanism and Mechanical Property of Soft Hydroxyl-terminated Polybutadiene Polyurethane under High Confining Pressure
- 高分子通报 2026年
- 作者机构：
  
  武汉理工大学物理与力学学院新材料力学理论与应用湖北省重点实验室　武汉 430070
- 作者简介：
  
  zhjiangtao@whut.edu.cn
- 基金信息：
  
  国家自然科学基金项目(52374202;11202154);航天化学动力技术重点实验室开放基金(STACPL220201B04);武汉理工大学大学生创新创业训练计划项目(S202510497231)
- DOI：10.14028/j.cnki.1003-3726.2026.26.068
  中图分类号：
- 收稿：2026-02-10，
  
  录用：2026-03-10，
- 稿件说明：
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郑佳乐, 张江涛, 周鹏, 费亦桐, 张梅, 翟鹏程. 高围压下软端羟基聚丁二烯聚氨酯拉伸断裂机制与力学性能. 高分子通报, doi: 10.14028/j.cnki.1003-3726.2026.26.068

Zheng, J. L.; Zhang, J. T.; Zhou, P.; Fei, Y. T.; Zhang, M.; Zhai, P. C. Tensile fracture mechanism and mechanical property of soft hydroxyl-terminated polybutadiene polyurethane under high confining pressure. Polym. Bull. (in Chinese), doi: 10.14028/j.cnki.1003-3726.2026.26.068
郑佳乐, 张江涛, 周鹏, 费亦桐, 张梅, 翟鹏程. 高围压下软端羟基聚丁二烯聚氨酯拉伸断裂机制与力学性能. 高分子通报, doi: 10.14028/j.cnki.1003-3726.2026.26.068 DOI：

Zheng, J. L.; Zhang, J. T.; Zhou, P.; Fei, Y. T.; Zhang, M.; Zhai, P. C. Tensile fracture mechanism and mechanical property of soft hydroxyl-terminated polybutadiene polyurethane under high confining pressure. Polym. Bull. (in Chinese), doi: 10.14028/j.cnki.1003-3726.2026.26.068 DOI：

摘要

端羟基聚丁二烯(Hydroxyl-terminated Polybutadiene

HTPB)聚氨酯是主要的固体推进剂胶黏剂材料之一，在工作状态下会承受高的内压作用，但目前缺乏对HTPB聚氨酯在高围压作用下的微细观结构和力学性能的研究。本工作首先采用高围压拉伸力学性能实验装置，测试软HTPB聚氨酯材料在不同围压(0~6.0 MPa)和初始拉伸应变率(0.0075~0.3750/s)条件下的力学性能，结合不同微细观结构表征方法，分析围压和应变率对HTPB聚氨酯拉伸破坏行为和力学性能的耦合影响机制。结果表明所制备HTPB聚氨酯材料的拉伸力学性能参数随应变率的增加而增加，围压会降低其拉伸力学性能的应变率敏感性。施加围压会增强HTPB聚氨酯内的微相分离，抑制塑性变形的发展，从而提高其模量、屈服强度及低应变率(0.0075/s)条件下的拉伸强度和断裂延伸率。而在高应变率条件(0.0750/s和0.3750/s)下，材料内部高的应力水平使得局部应力集中区域塑性变形快速发展，导致其拉伸强度和断裂延伸率随围压的增加而降低。最后基于时–压等效原理和实验结果，得到了所制备HTPB聚氨酯材料的弹性模量和屈服应力计算模型，计算表明所建立的模型能准确计算不同围压和应变率条件下所制备HTPB聚氨酯的弹性模量和屈服应力。

Abstract

Hydroxyl-terminated polybutadiene polyurethane (HTPB-PU) is one of the binders widely used in solid propellants at present. Although it has to withstand the high internal pressure during the ignition phase

there is still a lack of research on the microstructure and mechanical properties of HTPB-PU under high confining pressure. In this work

the tensile mechanical properties of a soft HTPB-PU under different confining pressures (0–6.0 MPa) and initial tensile strain rates (0.0075–0.3750/s) were tested by using a self-made tensile experiment system equipped with high confining pressure device. Combined with different microstructure characterization methods

the coupling effects of confining pressure and strain rate on the tensile failure behavior and mechanical properties of HTPB-PU were analyzed. The results showed that the tensile mechanical parameters of HTPB-PU increased with increasing strain rate

while the confining pressure reduced the strain rate sensitivity of the tensile property of the fabricated HTPB-PU. Applying confining pressure can enhance microphase separation

and suppress the plastic deformation in HTPB-PU

thus improving its elastic modulus

yield strength

and tensile strength and elongation at low strain rate (0.0075/s). At high strain rates (0.0750/s and 0.3750/s)

the tensile strength and elongation decrease with increasing confining pressure due to the rapid development of plastic deformation in the local stress concentration region owing to the high stress level within HTPB-PU. Finally

the models of elastic modulus and yield stress of the fabricated HTPB-PU were established based on the time-pressure superposition principle and experimental data. The calculation showed that the established model could accurately predict the elastic modulus and yield stress of HTPB-PU under different confining pressures and strain rates.

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