摘要
在现有的复合材料层间剪切强度测试方法中,用于计算强度的公式仅含有试样的几何参数而未考虑模量和中性面变化,所以仅适用于各向同性或横观各向同性复合板,对于不同材料非均匀铺设的异质多层复合板,使用该方法会得到不同严重程度的错误结果。鉴于此,本文首先构建了三层异质复合板中性面位置及层间切应力计算方法,进而推导出n层复合板中性面及层间切应力计算通式,结合短梁剪切法,建立了异质多层复合板层间剪切强度测量计算方法。计算分析表明,对于异质复合板,其最大相对层间切应力会随各层模量的变化而改变,其中性面也不再位于试样几何中心。针对GFRPP/胶/GFRPP和GFRPP/胶/钢这两类三层异质复合板的试验结果表明,本文方法能较准确地测量计算出异质复合板层间剪切强度,而现有方法则会随复合板各向异性程度的增加而逐渐偏离真实值。
For the existed testing methods of composite interlaminar shear strength(ILSS),the formula used to calculate ILSS only contains the geometric parameters of the sample without considering the changes in modulus and neutral plane,so they are only applicable to isotropic or transversely isotropic composite plates.For the heterogeneous multilayer plates,these methods will bring different degrees of error results.In view of this,a new calculation method for neutral plane position and interlaminar shear stress of three-layer heterogeneous composite plates was firstly constructed in this paper,and then the general formula for calculating neutral plane and interlaminar shear stress of n-layer composite plates was derived.Combined with the short beam shear method,the measurement and calculation method of ILSS of heterogeneous multi-layer composite plates was proposed.The analysis show that the maximum relative interlaminar shear stress of the heterogeneous composite plate will change with the change of the modulus of each layer,and the neutral plane is no longer located in the geometric center of the sample.Short beam shear tests were carried out for two types of heterogeneous composite plates composed of GFRPP/glue/GFRPP and GFRPP/glue/steel respectively.The results indicate that the proposed method can accurately measure and calculate the ILSS of heterogeneous composite plates,while the results obtained by the existed methods gradually deviate from the true value with the increase of the anisotropy degree of composite plates.
作者
周俊
王阳
黄明
翟孟雷
陈文广
张娜
刘春太
ZHOU Jun;WANG Yang;HUANG Ming;ZHAI Menglei;CHEN Wenguang;ZHANG Na;LIU Chuntai(National Engineering Research Center for Advanced Polymer Processing Technology,Zhengzhou University,Zhengzhou 450002,China)
出处
《复合材料科学与工程》
CAS
北大核心
2023年第11期5-11,77,共8页
Composites Science and Engineering
基金
国家重点研发计划(2019YFA0706802)
河南省重大科技专项(221100240400)
宁波市重大专项(2019B10117)。
关键词
层间剪切强度
层间切应力
中性面
短梁剪切法
复合板
复合材料
interlaminar shear strength
interlaminar shear stress
neutral surface
short beam shear method
laminated plate
composites