摘要
利用双立柱微机控制电子万能试验机并结合应变分析测量系统对密度为0.54g/cm3和0.62g/cm3的2种硬质聚氨酯泡沫(RPUF)进行准静态劈裂以及利用分离式霍普金森压杆对密度为0.62g/cm3的RPUF进行动态劈裂,试验研究主要考虑应变率、密度和长径比3个影响因素。结果表明,在RPUF的准静态劈裂试验中,其抗拉强度、弹性模量均随应变率的增大而提高,而随长径比的增大却呈现降低的趋势;此外,RPUF的抗拉强度与密度也有着密切关系,即材料密度越大,抗拉强度越高,而对于较高密度的材料,当应变率达到一定值后,其抗拉强度的变化不再明显;在动态劈裂试验中,RPUF的DIF值随应变率的增大而明显升高且呈非线性增长的趋势,而抗拉强度、弹性模量均随长径比的增大而降低。
The quasi-static split tests of rigid polyurethane foams(RPUF)with densities of 0.54 and 0.62 g/cm3 were carried out on a universal test machine equipped with a strain analysis measuring system.Meanwhile,the dynamic split tests of RPUF with a density of 0.62 g/cm3 were performed by the method of split-Hopkinson pressure bar.The influence factors of strain rate,density and aspect ratio are mainly considered in the experimental study.The results indicated that the tensile strength and elastic modulus of RPUF increased with an increase of strain rate in the quasi-static splitting tests,but decreased with an increase of aspect ratio.Moreover,the tensile strength was relative with the density.The greater the material density,the higher was the tensile strength.For the RPUF with a higher density,the variation of tensile strength was no longer significant material when the strain rate reached a certain value.In dynamic splitting tests,the DIF value of RPUF was improved remarkably with an increase of strain rate,and it also tended to increase nonlinearly.However,the tensile strength and elastic modulus decreased with an increase of aspect ratio.
作者
江伟
卢玉斌
姜锡权
段俊舟
JIANG Wei;LU Yubin;JIANG Xiquan;DUAN Junzhou(Key Laboratory of Testing Technology for Manufacturing Process of Ministry of Education,Southwest University of Science and Technology,Mianyang 621010,China;Army Artillery Corps Air Defense Academy,Laboratory of Dynamics of Advanced Materials,Hefei 230031,China)
出处
《中国塑料》
CAS
CSCD
北大核心
2018年第7期90-99,共10页
China Plastics
基金
NSAF联合基金(U1430110)
西南科技大学平台基金(14tdzk01)
关键词
劈裂拉伸
霍普金森压杆
应变率
长径比
split tension
Hopkinson pressure bar
strain rate
aspect ratio
