scholarly journals Residual compression property and response of honeycomb sandwich structures subjected to single and repeated quasi-static indentation

2021 ◽  
Vol 60 (1) ◽  
pp. 404-417
Author(s):  
Hangyu Ye ◽  
Xiangjun Dai ◽  
Tianyu Yuan ◽  
Jilei Zhou ◽  
Jipeng Zhang ◽  
...  
Keyword(s):  
Sandwich Structures ◽  
Three Dimensional ◽  
Correlation Method ◽  
Image Correlation ◽  
Low Velocity Impact ◽  
Low Velocity ◽  
Governing Parameter ◽  
Honeycomb Sandwich ◽  
Static Indentation ◽  
Residual Compression

Abstract This paper investigated the response and residual compression properties of honeycomb sandwich structures subjected to single quasi-static indentation (QSI) and repeated QSI (RQSI). The damage depth after repeated low-velocity impact (LVI) was considered as the governing parameter during the QSI experiments. Three-dimensional digital image correlation method was applied to determine deformation of the front panels after LVI and QSI to describe damage to honeycomb structures. For specimens with the same depth, it is found that the residual strength of QSI was less than that of LVI and close to that of RQSI. Results indicated that it is more reasonable to describe the damage by volume than by depth.

Strength Response and Failure Analysis of Ceramic Alumina Tiles

2009 ◽  
Vol 417-418 ◽  
pp. 673-676 ◽  
Author(s):  
Dan Mihai Constantinescu ◽  
Marin Sandu ◽  
Eniko Volceanov ◽  
Matei Constantin Miron ◽  
Dragos Alexandru Apostol
Keyword(s):  
Correlation Method ◽  
Calibration Procedure ◽  
High Energy ◽  
Impact Testing ◽  
Image Correlation ◽  
Measuring System ◽  
Low Velocity Impact ◽  
Strain History ◽  
Ceramic Tiles ◽  
Low Velocity

Static loading and impact tests of ceramic alumina tiles have shown a very interesting behaviour of tough, brittle, and high energy absorbing materials. Strain gauges techniques and data acquisition were used in previous research for static and low velocity impact testing. A static-dynamic equivalence was done through a calibration procedure of the measuring system. The research is continued in this paper by using the digital image correlation method with the complete displacement and strain history acquired till the failure of the ceramic tiles of different compositions, proving the capacity of such materials to be used for particular purpose applications.

Compression after impact behavior of titanium honeycomb sandwich structures

2017 ◽  
Vol 20 (5) ◽  
pp. 639-657 ◽  
Author(s):  
Wei Zhao ◽  
Zonghong Xie ◽  
Xiang Li ◽  
Xishan Yue ◽  
Junfeng Sun
Keyword(s):  
Failure Modes ◽  
Sandwich Structures ◽  
Impact Damage ◽  
Sandwich Panels ◽  
Low Velocity Impact ◽  
Impact Behavior ◽  
Failure Strength ◽  
Compressive Failure ◽  
Low Velocity ◽  
Honeycomb Sandwich

Titanium honeycomb sandwich structures are gradually used in several newly developed aircrafts in China. During the manufacturing process and aircraft service life, low-velocity impacts from foreign objects (typically stones, tools and hails, etc.), would quite likely happen and could not be completely avoided. In order to evaluate the influence of low-velocity impact damage on titanium honeycomb sandwich structures, unidirectional in-plane compression tests on both intact and impact damaged sandwich panels were conducted to obtain their failure modes and compressive failure strength. Test results showed that the low-velocity impact damage could cause the change in failure modes and a 9% to 15% decrease in the compressive failure strength. Different impact energy levels showed a limited influence on the compressive failure strength. Numerical analysis was conducted to study the compression after impact behavior of titanium sandwich panels. Parametric finite element models that contained all the geometric and the structural details of honeycomb core cells, as well as the indentation and the crushed core region, were developed in the analysis. The numerical results successfully exhibited the failure process of the intact and impact damaged titanium sandwich panels subjected to unidirectional in-plane compression, similar to what observed in the tests. The predicted compressive failure strength also agreed very well with the test data.

scholarly journals Post-Impact Investigation of CFRP Laminated Plate

2014 ◽  
Vol 71 (2) ◽  
Author(s):  
H.A Israr ◽  
N. Hongkarnjanakul ◽  
S. Rivallant ◽  
C. Bouvet
Keyword(s):  
Impact Analysis ◽  
Image Correlation ◽  
Low Velocity Impact ◽  
Low Velocity ◽  
Cfrp Laminates ◽  
Static Indentation ◽  
Indentation Tests ◽  
Post Impact ◽  
Carbon Fibre Reinforced Plastic ◽  
Delamination Area

This paper deals with low-velocity impact and quasi-static indentation tests on carbon fibre reinforced plastic (CFRP) laminates that classically used in aeronautical applications. The aim is to carry out post-impact analysis using Vic 3-D digital image correlation to investigate the behaviour of permanent indentation which is an important condition for the damage tolerance justification in composite. Result shows the indentation depth decreased with the time due to relaxation of the specimen until at certain position. The microscopic observations were carried out to understand the phenomenon.  Besides that, the post-mortem analyses on the impacted plate were also carried out through microscopic observation to determine the delamination area at each interface which is normally difficult to extract from the C-Scan result. The observations were made at three different sections cut (0°, 90° and 45°). The results of delamination area obtained from both microscopic and C-scan analysis is compared and there are rather satisfying to each other.

Discrete modelling of low-velocity impact on Nomex® honeycomb sandwich structures with CFRP skins

2019 ◽  
Vol 207 ◽  
pp. 108-118 ◽  
Author(s):  
Clément Audibert ◽  
Anne-Sophie Andréani ◽  
Éric Lainé ◽  
Jean-Claude Grandidier
Keyword(s):  
Sandwich Structures ◽  
Low Velocity Impact ◽  
Low Velocity ◽  
Velocity Impact ◽  
Discrete Modelling ◽  
Honeycomb Sandwich

Low-velocity impact behaviour of titanium honeycomb sandwich structures

2017 ◽  
Vol 20 (8) ◽  
pp. 1009-1027 ◽  
Author(s):  
Zonghong Xie ◽  
Wei Zhao ◽  
Xinnian Wang ◽  
Jiutao Hang ◽  
Xishan Yue ◽  
...  
Keyword(s):  
Contact Force ◽  
Sandwich Structures ◽  
Impact Damage ◽  
Low Velocity Impact ◽  
Low Velocity ◽  
Velocity Impact ◽  
Honeycomb Sandwich ◽  
The Impact ◽  
Maximum Contact ◽  
Positive Effect

Titanium honeycomb sandwich structures are gradually used in newly developed aircrafts in China. In this study, low-velocity impact tests on the titanium honeycomb sandwich structures were carried out to obtain the impact dynamic response and investigate the typical impact damage modes and parameters including the depths and diameters of the facesheet indentation and the core crushing region. The test results showed that the maximum contact force, the diameter and depth of the indentation had strong positive correlations to the impact energy. Numerical analysis was also conducted to study the low-velocity impact behaviour of the titanium honeycomb sandwich structures by using parametric finite element models that contained all the geometric and the structural details of the titanium honeycomb cores. The numerical results successfully captured the typical low-velocity impact damage modes of the titanium sandwich structures, similar to those observed in the tests. The predicted impact dynamic response also agreed very well with the test data. By using the validated finite element models, a parameter sensitivity study on the effects of the structural parameters on the low-velocity impact damage behaviour of the titanium sandwich structures was conducted. The parametric analysis results showed that the impactor diameter, the facesheet thickness and the core cell wall thickness had positive effect on the maximum contact force, and negative effect on the indentation depth, while the height of the honeycomb core had positive effect on the contact force, but little influence on the indentation depth.

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