【作者】 井引弟； 王波； 邓琼； 曾翔龙； 李玉龙；

【Author】 Yindi Jing;Bo Wang;Qiong Deng;Xianglong Zeng;YuLong Li;Institute of Advanced Structures and Materials, School of Aeronautics, Northwestern Polytechnic University;

【机构】 西北工业大学航空学院先进结构与材料研究所；

【摘要】 B₄C陶瓷相比金属具有低密度、高硬度、耐磨损、耐高温的优异特点。随着B₄C陶瓷在国防军工、核电技术等领域的广泛应用,对其力学性能、抗冲击特性及损伤规律的研究也愈加重要。本文使用最大载荷为100KN的CSS-44100电子万能实验机和分离式霍普金森杆对增材制造层状B₄C陶瓷分别进行静态压缩、动态压缩以及动态拉伸实验;通过合理的整形技术对动态实验的入射波进行整形,获得不同应变率下层状B₄C陶瓷的应力-应变曲线图;对层状B₄C陶瓷的应变率效应进行分析。结果表明:层状B₄C陶瓷为典型的脆性材料,应变率为2*10^-4/S时其压缩强度为1213MPa;应变率为300/s时其压缩强度为1600MPa,具有明显的应变率效应;应变率为50/s时其拉伸强度为245MPa,拉伸强度不足压缩强度的五分之一。本文的研究成果对后续B₄C层状陶瓷的设计和应用具有一定的价值。更多还原

【Abstract】 Compared with metal, B₄C ceramics has excellent characteristics of low density, high hardness,wear resistance and high temperature resistance.With the wide application of B₄C ceramics in national defense,military industry, nuclear power technology and other fields, the research on its mechanical properties, impact resistance characteristics and damage rules becomes more and more important.In this paper, a CSS-44100 electronic universal test machine with a maximum load of 100 KN were used to conduct static compression,while a separated hopkinson bar were used to conduct dynamic compression and dynamic tensiletests on layered B₄C ceramics made by additive.Through reasonable shaping technology, the incident wave of dynamic experiment was reshaped, and the stress-strain curve of B₄C ceramics with different strain rates was obtained.The strain rate effect of layered B₄C ceramics was analyzed.The results show that layered B₄C ceramics are typical brittle materials, and their compression strength is 1213 MPa when the strain rate is2*10^-4/S.When the strain rate is 300/s, its compression strength is 1600 MPa, showing obvious strain rate effect.When the strain rate is 50/s, the tensile strength is 245 MPa, which is less than one fifth of the compression strength.The research results in this paper have certain value to the design and application of B₄C layered ceramics.更多还原