Impact damage tolerance (IDT) evaluation and aircraft structure designing under IDT demands

1998 ◽  
Author(s):  
Georgii Ukraintsev
Keyword(s):  
Damage Tolerance ◽  
Impact Damage ◽  
Aircraft Structure

Investigation on Damage Tolerance of Thick Laminate Composite Structure

2015 ◽  
Vol 665 ◽  
pp. 149-152
Author(s):  
Hyun Bum Park
Keyword(s):  
Standardized Test ◽  
Damage Tolerance ◽  
Impact Damage ◽  
Specimen Thickness ◽  
Aircraft Structure ◽  
Functional Capability ◽  
Damage Level ◽  
Typical Specimen ◽  
Standard Design ◽  
Laminate Composite Structure

This study is to investigate the compressive strength of the carbon/epoxy thick laminate after damage. Through damage tolerance of thick laminate is not standardized test because specimens exceed typical specimen thickness described in the ASTM standard, design allowable of thick laminate shall be determined by the experiment to address design criteria of the structure and incorporate functional capability with damage level. In this study, it is performed the research on damage tolerance of thick laminate adopting aircraft structure. The damage tolerance of thick laminates such as no damage and impact damage is evaluated under compression loading.

Tolerance of Composite Pipes to Local Impact Damage

1996 ◽  
Vol 210 (3) ◽  
pp. 181-192 ◽  
Author(s):  
S R Reid ◽  
C Peng ◽  
J N Ashton
Keyword(s):  
Damage Tolerance ◽  
Impact Damage ◽  
Local Loading ◽  
Experimental Programme ◽  
Filament Wound ◽  
Nose Shape ◽  
Local Impact ◽  
Chopped Strand Mat ◽  
Composite Pipes

The results of an extensive experimental programme on local loading of composite pipes are presented. Particular attention is directed to the influence of projectile nose shape on the damage tolerance of the pipes. Both filament wound pipes and lined chopped-strand mat pipes are considered.

Data Analysis and Forecast for Aircraft Structure Impact Damage Based on GP Symbolic Fitting Method

2011 ◽  
Vol 217-218 ◽  
pp. 701-705
Author(s):  
Man Yi Hou ◽  
Hui Lin Fan ◽  
Wu Lin Zhu
Keyword(s):  
Impact Damage ◽  
Aircraft Structure ◽  
Matlab Program ◽  
Fitting Method ◽  
Sample Data ◽  
Damage Data ◽  
Impact Parameters ◽  
The Times ◽  
The Impact ◽  
Fitting Model

In order to research the aircraft impact damage, one symbolic fitting method for analyzing and forecasting the damage data is proposed based on genetic programming (GP). The method can be used to forecast the impact damage by recognizing the rule in some groups of actual data including impact parameters and damage hole size. The principle of GP symbolic fitting method is briefly introduced. The fitting model is created with some sample data respectively for training and testing from Sorenson experiential equation. The computation with Matlab program indicates the model has a good performance to fit and forecast the damage data with avoiding the noise. The application of GP symbolic fitting method can help to decrease the times of fire experiments. Since the method can recognize the complicated nonlinear relationship between the impact parameters and damage data, it is more applicable than theoretical analysis and experiential equation to forecast the aircraft impact damage.

Comparison of the impact damage resistance of non-hybrid and intra-ply hybrid carbon/E-glass/polypropylene non-crimp thermoplastic composites

2018 ◽  
Vol 38 (1) ◽  
pp. 31-45 ◽  
Author(s):  
Gaye Kaya
Keyword(s):  
Damage Tolerance ◽  
Impact Damage ◽  
Low Velocity Impact ◽  
Thermoplastic Composites ◽  
Low Velocity ◽  
Impact Properties ◽  
Compression After Impact ◽  
Post Impact ◽  
The Impact ◽  
Hybrid Carbon

This study aims to compare the low-velocity impact and post-impact properties of intra-ply hybrid carbon/E-glass/polypropylene non-crimp thermoplastic composites with non-hybrid carbon/PP and E-glass/PP non-crimp thermoplastic composites. Impact test was performed at four energy levels as 15 J, 30 J, 45 J and 60 J. Post-impact properties of hybrid thermoplastic composites were tested by compression after impact method for each energy level to understand the impact damage tolerance of intra-ply hybrid carbon/E-glass/PP non-crimp thermoplastic composites. The effect of hybridization on energy absorption of composites was not significant, while C-scan results showed that the intra-ply hybrid non-crimp thermoplastic composites had smaller impact damage areas in comparison to the non-hybrid samples. Compression and compression after impact tests results confirmed that the intra-ply hybridization increased the toughness of the composite laminates. Also, the residual compression strength/modulus increased with hybridization which indicated to damage tolerance.

scholarly journals Mechanical Properties of Flax Tape-Reinforced Thermoset Composites

Materials ◽  
2020 ◽  
Vol 13 (23) ◽  
pp. 5485
Author(s):  
Forkan Sarkar ◽  
Mahmudul Akonda ◽  
Darshil U. Shah
Keyword(s):  
Damage Tolerance ◽  
Impact Damage ◽  
Void Content ◽  
Polyester Resins ◽  
Thermoset Composites ◽  
Pull Out ◽  
Thermoset Resin ◽  
Comparable Performance ◽  
Interlaminar Shear ◽  
Flow Experiments

Three thermoset resin systems—bio-epoxy, epoxy, and polyester-with 30 v% flax fiber reinforcement have been studied to identify the optimal fiber–resin combination in a typical composite structure. Tensile, interface and interlaminar shear strength together with flexural and impact damage tolerance were compared in this study. The results revealed that mechanical and interfacial properties were not significantly affected by the different resin systems. Microscopy studies reveal that epoxy laminates predominantly fail by fibre linear breakage, polyester laminates by fiber pull-out, and bio-epoxy laminates by a combination of the two. The higher failure strains and pull-out mechanism may explain the better impact damage tolerance of polyester composites. Flow experiments were also conducted, revealing faster impregnation and lower void content with polyester resin, followed by bio-epoxy, due to their lower viscosities. Overall, bio-epoxy resin demonstrates comparable performance to epoxy and polyester resins for use in (semi-)structural bio-composites.

scholarly journals Impact damage tolerance of thermoset composites reinforced with hybrid commingled yarns

2016 ◽  
Vol 91 ◽  
pp. 522-538 ◽  
Author(s):  
Erdem Selver ◽  
Prasad Potluri ◽  
Paul Hogg ◽  
Costas Soutis
Keyword(s):  
Damage Tolerance ◽  
Impact Damage ◽  
Thermoset Composites ◽  
Commingled Yarns
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