权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

Study on shear properties of FRP laminates through the thickness direction under static and imapact loadings

静态和冲击载荷下 FRP 层合板厚度方向剪切性能的研究

基本信息

批准号：
07650118
负责人：
BEN Goichi
金额：
$ 1.6万
依托单位：
Nihon University, College of Industrial Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1996
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07650118/
关键词：
CFRP laminate Transverse Sear Modulus Transverse Failure Strain Transverse Isotropy Ultrasonic C-scan Electro Optical extensometer 3-D F..E.M Cross Elasticity 複合材料 CFRP 横せん断強度横せん断剛性ショートビームテスト

项目摘要

For the wider use of CFRP in the field of light weight structures, the static and impact transverse (through the thickness direction in CFRP laminates) shear properties of CFRP should be made clear. While transverse shear strengths have been reported by use of a short beam test, the transverse shear moduli and failure strains, however, have not reported because the measurement of these values is difficult in experiment.This research presents the first experiment for obtaining the static and impact transverse shear moduli and failure strains. In order to obtain these values, the difference of vertical displacement of two points on the neutral axis of short beam specimen is measured and is divided by the distance of these two points. For measuring this difference, an Electro optical extensometer is newly devised.When the fiber orientation angles of unidirectional laminates is changed from 0ﾟ to 90ﾟ, the variations of transverse shear moduli and failure strains are measured and the transversely isotropy is first confirmed by our experiment. These experimental moduli are compared with the analytical ones based on the classical lamination theory and the experimental values accord with analytical ones. Furthermore, the experimental results of the failure strain according to the fiber orientation angle are obtained first and their failure modes are examined by use of an ultrasonic C-scan. It is finally showed that these failure modes qualitatively agree with ones obtained by a three dimensional FEM.

为了CFRP在轻量化结构领域的更广泛应用，应明确CFRP的静力和冲击横向（通过CFRP层压板的厚度方向）剪切性能。虽然横向剪切强度已被报道使用短梁试验，横向剪切模量和破坏应变，然而，没有报道，因为这些值的测量在实验中是困难的。本文首次进行了静力和冲击横向剪切模量和破坏应变的试验研究。为了得到这些值，测量了短梁试件中性轴上两点的垂直位移差，并将其除以两点之间的距离。为了测量这一差异，我们设计了一种新的光电延伸计。当纤维取向角从0￣￣￣￣￣￣￣￣￣￣￣￣￣￣￣￣￣￣￣时，测量了横向剪切模量和破坏应变的变化规律，并首次证实了横向各向同性。将实验模量与基于经典层压理论的解析模量进行了比较，实验值与解析模量基本一致。在此基础上，首先得到了随纤维取向角变化的破坏应变的实验结果，并利用超声c扫描对其破坏模式进行了分析。结果表明，这些破坏模式与三维有限元分析结果在质量上是一致的。