冲击载荷下硼酸改性端羟基聚硅氧烷-二氧化硅复合材料的响应特性

doi:10.3969/j.issn.1000-1093.2018.01.015

兵工学报 ›› 2018, Vol. 39 ›› Issue (1): 137-145.doi: 10.3969/j.issn.1000-1093.2018.01.015

冲击载荷下硼酸改性端羟基聚硅氧烷-二氧化硅复合材料的响应特性

周鼎¹，苗应刚¹，王严培¹，李峰²，李玉龙¹

(1.西北工业大学先进材料与结构研究所, 陕西西安 710072; 2.西安理工大学材料科学与工程学院, 陕西西安 710048)

收稿日期:2017-01-09 修回日期:2017-01-09 上线日期:2018-03-13
通讯作者: 李玉龙(1961—)，长江学者特聘教授，博士生导师 E-mail:liyulong@nwpu.edu.cn
作者简介:周鼎(1990—)，男，博士研究生。 E-mail: dzhou@mail.nwpu.edu.cn
基金资助:
国家自然科学基金重大科研仪器设备研制专项项目(11527803)

Mechanical Responses of PBDMS-silica under Impact Loading

ZHOU Ding¹, MIAO Ying-gang¹, WANG Yan-pei¹, LI Feng², LI Yu-long¹

(1.Institute of Advanced Materials and Structures, Northwestern Polytechnical University, Xi'an 710072，Shaanxi, China; 2.School of Material Science and Engineering, Xi'an University of Technology, Xi'an 710048, Shaanxi, China)

Received:2017-01-09 Revised:2017-01-09 Online:2018-03-13

摘要/Abstract

摘要： 为研究硼酸改性端羟基聚硅氧烷-二氧化硅轻质冲击硬化聚合物复合材料抗冲击特性及其机理，进行了单轴压缩、冲击试验；结合高速摄影和数字图像相关技术以及有限元仿真，研究材料的变形过程。结果表明：该材料在准静态载荷下呈黏性流动态，而在动态载荷下呈现固体状态，其流动应力提高了10⁴倍以上；当受到冲击载荷时，材料表现出一定的抗冲击性能，且抗冲击性能随着冲击速度和颗粒含量的提高而增强，材料在冲击过程中处于压力-剪力耦合应力状态，剪力所起作用随着冲击速度提高而逐渐增强；高速摄影结果显示，材料在冲击过程中发生阻塞转变，其中动态压缩导致材料局部硬化并表现出抗冲击特性，剪应力决定了材料抗冲击性能的应变率敏感性。因此，提高材料动态剪切响应是改善材料抗冲击性能的最优途径。

关键词: 冲击硬化聚合物, 抗冲击性能, 动态力学响应, 应变率敏感性, 阻塞转变

Abstract: The impact testing, quasi-static and dynamic compressions and finite element simulation were performed to investigate the impact-resistant properties and rate-dependence mechanism of an impact-hardening polymer composite (PBDMS-silica). PBDMS-silica shows liquid-to-solid transition under impact loading, and such impact-resistant behavior is volume fraction-dependent and rate-dependent. This is confirmed by over 10⁴ times increase in compressive and shear strength in the range from quasi-static to dynamic loading. Finite element method (FEM) shows a compression-shear-coupled stress state in PBDMS-silica during impact loading, and the shear stress plays an increasingly important role in impact resistance. Jamming transition is captured during the deformation of the impact-hardening polymer by high-speed imaging with digital image correlation (DIC) technique. Combined with the mechanical responses, the conclusions are made that jamming transition induced by dynamic compression is the source of impact-resistant behavior, and the dynamic shear during impact determines how such behavior is rate-dependent. This provides a solution for the improvement of impact resistance by strengthening the dynamic shear response of the material. Key

Key words: impact-hardeningpolymercomposite, impact-resistantproperty, dynamicmechanicalresponse, strain-ratesensitivity, jammingtransition

中图分类号:

O347.3

周鼎，苗应刚，王严培，李峰，李玉龙. 冲击载荷下硼酸改性端羟基聚硅氧烷-二氧化硅复合材料的响应特性[J]. 兵工学报, 2018, 39(1): 137-145.

ZHOU Ding, MIAO Ying-gang, WANG Yan-pei, LI Feng, LI Yu-long. Mechanical Responses of PBDMS-silica under Impact Loading[J]. Acta Armamentarii, 2018, 39(1): 137-145.

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冲击载荷下硼酸改性端羟基聚硅氧烷-二氧化硅复合材料的响应特性

Mechanical Responses of PBDMS-silica under Impact Loading

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