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
查看参考文献38篇
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文摘
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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10~4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。 |
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其他语种文摘
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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 10~4 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. |
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来源
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兵工学报
,2018,39(1):137-145 【核心库】
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DOI
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10.3969/j.issn.1000-1093.2018.01.015
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关键词
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冲击硬化聚合物
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抗冲击性能
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动态力学响应
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应变率敏感性
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阻塞转变
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地址
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1.
西北工业大学先进材料与结构研究所, 陕西, 西安, 710072
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西安理工大学材料科学与工程学院, 陕西, 西安, 710048
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1000-1093 |
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学科
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力学 |
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基金
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国家自然科学基金重大科研仪器设备研制专项项目
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文献收藏号
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CSCD:6187196
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