Experimental study on the temperature effect on the flexural properties of Nomex honeycomb sandwich structure

2016 ◽  
Vol 45 (1) ◽  
pp. 120004 ◽  
Author(s):  
王家伟 Wang Jiawei ◽  
陈敏孙 Chen Minsun ◽  
江厚满 Jiang Houman
Keyword(s):  
Experimental Study ◽  
Temperature Effect ◽  
Sandwich Structure ◽  
Flexural Properties ◽  
Honeycomb Sandwich ◽  
Nomex Honeycomb ◽  
Honeycomb Sandwich Structure

Experimental Study on the Mechanical Properties of Two Sandwich Structure Composite Materials

2013 ◽  
Vol 561 ◽  
pp. 466-471
Author(s):  
Chuan Sheng Wang ◽  
Qing Kun Liu
Keyword(s):  
Mechanical Properties ◽  
Experimental Study ◽  
Tensile Strength ◽  
Composite Materials ◽  
Sandwich Structure ◽  
National Standards ◽  
Honeycomb Sandwich ◽  
Pros And Cons ◽  
Nomex Honeycomb ◽  
Honeycomb Sandwich Structure

According to the relevant national standards, this paper produced Corecell ™ G foam sandwich structure and Nomex honeycomb sandwich structure composite materials specimens. These two materials were carried out tensile, compression, bending and shear experiment. Analyzing and comparing the pros and cons of the two materials in the mechanical properties of tensile strength, compressive strength, shear strength, flexural strength.

Experiment and Simulation on the Flexural Properties of Fiber-Paper Honeycomb Sandwich Structure Compound Panel

2012 ◽  
Vol 200 ◽  
pp. 80-85
Author(s):  
Xiao Jun Yang ◽  
Qing Shan Lan ◽  
Yu Ning Zhong ◽  
Li Xia Zeng
Keyword(s):  
Sandwich Structure ◽  
Optimization Design ◽  
Sandwich Panel ◽  
Flexural Properties ◽  
Engineering Software ◽  
Equivalent Models ◽  
Bending Load ◽  
Honeycomb Sandwich ◽  
Paper Honeycomb ◽  
Honeycomb Sandwich Structure

Two equivalent models based on sandwich panel theory and equivalent panel theory were discussed in this paper. By analyzing the performance of fiber - paper honeycomb sandwich structure compound panel by bending load, the computational results are in accordance with test and Engineering software ANSYS. Therefore, it shows that the finite element equivalent models are reasonable and practical for the optimization design of fiber - paper honeycomb sandwich composites.

Out-of-plane shear property analysis of Nomex honeycomb sandwich structure

2020 ◽  
pp. 073168442094328 ◽  
Author(s):  
Yue Liu ◽  
Wei Liu ◽  
Weicheng Gao
Keyword(s):  
Shear Strength ◽  
Shear Modulus ◽  
Sandwich Structure ◽  
Honeycomb Core ◽  
Plane Shear ◽  
Honeycomb Sandwich ◽  
Out Of Plane ◽  
Nomex Honeycomb ◽  
Analytical Expressions ◽  
Honeycomb Sandwich Structure

Honeycomb sandwich structure finds immense applications in aerospace manufacturing and other similar fields. The Nomex honeycomb sandwich structural material exhibits a complex structure and boundary conditions, making it difficult to obtain exact solutions for the equivalent out-of-plane shear modulus and shear strength of the Nomex honeycomb using current analytical methods. To this end, based on the energy method, the Kelsey model is simplified in this paper. Then, distribution of the shear forces in the longitudinal and transverse directions of the Nomex honeycomb core is analysed using the simplified model. Considering the effect of the wall thickness of the honeycomb core on the ultimate strength, the analytical expressions of the out-of-plane shear modulus and shear strength of the Nomex honeycomb are proposed. The shear properties and failure process of the Nomex honeycomb in two directions are then analysed experimentally. The accuracy of the analytical expressions of the equivalent shear modulus and shear strength is verified experimentally. The equivalent out-of-plane shear modulus and shear strength of the honeycomb was demonstrated to be effectively predicted by the analytical approach.

scholarly journals Defect detection of GFRP/Nomex honeycomb sandwich structure by linear frequency modulation infrared thermal imaging

2021 ◽  
Vol 25 (6 Part B) ◽  
pp. 4611-4619
Author(s):  
Qing-Ju Tang ◽  
Wei-Ming Fan ◽  
Juan Ji ◽  
Ya-Fei Song
Keyword(s):  
Principal Component Analysis ◽  
Sandwich Structure ◽  
Signal To Noise Ratio ◽  
Principal Component ◽  
Component Analysis ◽  
Signal To Noise ◽  
Honeycomb Sandwich ◽  
Water Accumulation ◽  
Nomex Honeycomb ◽  
Honeycomb Sandwich Structure

Honeycomb sandwich material is a new material widely used in many fields, but it is easy to produce defects such as delamination and ponding in the process of manufacturing and service. First, a honeycomb sandwich sample containing delamination defects and water accumulation was built. Then, a linear frequency modulated driving halogen lamp is used as the excitation source. Finally, the surface thermal image sequence of the test sample is acquired by infrared thermal imager. Image sequences are processed by inter-frame difference-multi-frame cumulative average method, principal component analysis, Fourier transform method, and logarithmic polynomial fitting method, respectively. Define and calculate the signal-to-noise ratio of the heat map processed by each algorithm. Compared with the other three algorithms, the principal component analysis method processed the image with the highest signal-to-noise ratio and high contrast. This algorithm achieves effective identification of delamination defects and water accumulation in GFRP/Nomex honeycomb sandwich structure.

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