scholarly journals Experimental characterization of the impact-damage tolerance of a cross-ply graphite-fiber/epoxy laminate

2008 ◽  
Vol 29 (5) ◽  
pp. 534-543 ◽  
Author(s):  
Xiang-Fa Wu ◽  
Goutam Ghoshal ◽  
Mikhail Kartashov ◽  
Zuleyha Aslan ◽  
Joseph A. Turner ◽  
...  
Keyword(s):  
Damage Tolerance ◽  
Impact Damage ◽  
Graphite Fiber ◽  
Experimental Characterization ◽  
The Impact

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.

First-principles and experimental characterization of the electronic properties of CaGaSiN3 and CaAlSiN3: the impact of chemical disorder

2017 ◽  
Vol 19 (13) ◽  
pp. 9292-9299 ◽  
Author(s):  
Robin Niklaus ◽  
Ján Minár ◽  
Jonas Häusler ◽  
Wolfgang Schnick
Keyword(s):  
Electronic Properties ◽  
First Principles ◽  
Theoretical Basis ◽  
Experimental Characterization ◽  
Host Materials ◽  
Chemical Disorder ◽  
The Impact

Understanding the impact of chemical disorder on the electronic properties of LED phosphor host materials on a theoretical basis.

Impact Damage Tolerance and Fatigue Durability of GLARE Laminates

2008 ◽  
Vol 130 (4) ◽  
Author(s):  
Hyoungseock Seo ◽  
H. T. Hahn ◽  
Jenn-Ming Yang
Keyword(s):  
Residual Strength ◽  
Impact Test ◽  
Damage Tolerance ◽  
Impact Damage ◽  
Fatigue Behavior ◽  
Energy Levels ◽  
Damage Initiation ◽  
Fatigue Durability ◽  
Weight Impact ◽  
The Impact

The fatigue behavior and residual strength of postimpacted GLARE 4-3/2, GLARE 5-2/1, and monolithic aluminum 2024-T3 alloy were investigated experimentally. Drop-weight impact was applied at a variety of energy levels to inflict a barely visible impact damage, a clearly visible impact damage, and a penetration damage. After the impact test, constant-amplitude tension-tension fatigue was done to delineate the modes of damage initiation and growth and the effect of damage on fatigue life and residual strength. The results showed that GLARE laminates exhibit superior postimpact fatigue durability when compared with the monolithic 2024-T3 aluminum alloy.

scholarly journals Experimental Characterization of Drag Coefficient of an UAV Recovery Parachute

2021 ◽  
Vol 31 (2) ◽  
pp. 67-74
Keyword(s):  
Drag Coefficient ◽  
Unmanned Aerial Vehicles ◽  
Drag Force ◽  
Aerodynamic Drag ◽  
Experimental Characterization ◽  
Aerial Vehicles ◽  
Flat Type ◽  
Suspension Line ◽  
The Impact

Parachute recovery systems are proved to be an efficient method to recovery and rescue unmanned aerial vehicles (UAV) as it follows most requirements of reliability and airworthiness in flights. Parachutes are key components of the recovery systems and the drag coefficient of parachutes plays a crucial role in evaluating parachute’s performance. The purpose of the research is to determine and compare the impact of some factors on aerodynamic drag force during the inflation of a parachute. The canopy’s shape (flat circular type and extended skirt 10% flat type), of the length of suspension lines (be in proportion to nominal diameter from 0.6 to 1.5) are considered. Measurement of the drag force of the parachute models is carried out in an open return wind tunnel. Experimental results show that flat circular canopy has a higher drag coefficient than extended skirt 10% flat model in the range of low speed from 3 to 6 m/s. However, when wind speed is greater than 6 m/s, the drag coefficients of both two parachute types are nearly 0.85. In terms of the suspension line, the longer length would significantly raise the coefficient of drag force.

scholarly journals Experimental Characterization of the Jet Wiping Process

2018 ◽  
Vol 180 ◽  
pp. 02064
Author(s):  
Miguel Alfonso Mendez ◽  
Adriana Enache ◽  
Anne Gosset ◽  
Jean-Marie Buchlin
Keyword(s):  
Gas Flow ◽  
Detection Algorithm ◽  
Gas Flows ◽  
Experimental Characterization ◽  
Data Set ◽  
Time Resolved ◽  
Numerical Studies ◽  
Image Velocimetry ◽  
The Impact

This paper presents an experimental characterization of the jet wiping process, used in continuous coating applications to control the thickness of a liquid coat using an impinging gas jet. Time Resolved Particle Image Velocimetry (TR-PIV) is used to characterize the impinging gas flow, while an automatic interface detection algorithm is developed to track the liquid interface at the impact. The study of the flow interaction is combined with time resolved 3D thickness measurements of the liquid film remaining after the wiping, via Time Resolved Light Absorption (TR-LAbs). The simultaneous frequency analysis of liquid and gas flows allows to correlate their respective instability, provide an experimental data set for the validation of numerical studies and allows for formulating a working hypothesis on the origin of the coat non-uniformity encountered in many jet wiping processes.

scholarly journals CFD and Experimental Characterization of a Bioreactor: Analysis via Power Curve, Flow Patterns and k L a

Processes ◽  
2020 ◽  
Vol 8 (7) ◽  
pp. 878
Author(s):  
Luis A. Ramírez ◽  
Edwar L. Pérez ◽  
Cesar García Díaz ◽  
Dumar Andrés Camacho Luengas ◽  
Nicolas Ratkovich ◽  
...  
Keyword(s):  
Lower Energy ◽  
Scaling Up ◽  
Airflow Rate ◽  
Biological Processes ◽  
Experimental Characterization ◽  
Cfd Simulations ◽  
Transfer Rates ◽  
Curve Flow ◽  
The Impact

Mixing operations in biological processes is of utmost importance due to its effect on scaling-up and heat and mass transfer. This paper presents the characterization of a bench-top bioreactor with different impeller configurations, agitation and oxygen transfer rates, using CFD simulations and experimental procedures. Here, it is demonstrated that factors such as the type of impeller and the flow regime can drastically vary the operation as in the preparation of cultures. It was observed that the bioreactor equipped with a Rushton generates a k L a of 0.0056 s−1 for an agitation velocity and airflow rate of 250 RPM and 5 L/min, respectively. It is suitable result for the dissolved oxygen (DO) but requires a considerable amount of power consumption. It is here where the importance of the agitator’s diameter can be observed, since, in the case of the two propeller types studied, lower energy consumption can be achieved with a smaller diameter, as well as a much smaller shear cup 2.376 against 0.723 s−1 by decreasing by 4 cm the standard diameter of an agitated tank (10 cm). Finally, the k L a values obtained for the different configurations are compared with the maximum shear rate values of different cell cultures to highlight the impact of this study and its applicability to different industries that use agitation processes for cell growth.

Thermoplastic/thermoset multilayer composites: A way to improve the impact damage tolerance of thermosetting resin matrix composites

2017 ◽  
Vol 171 ◽  
pp. 298-305 ◽  
Author(s):  
Camille Sonnenfeld ◽  
Hakima Mendil-Jakani ◽  
Romain Agogué ◽  
Philippe Nunez ◽  
Pierre Beauchêne
Keyword(s):  
Damage Tolerance ◽  
Impact Damage ◽  
Resin Matrix ◽  
Matrix Composites ◽  
Thermosetting Resin ◽  
Multilayer Composites ◽  
The Impact

Damage tolerance of composite T-sections made of cost-effective carbon fibre preforms

2015 ◽  
Vol 6 (1) ◽  
pp. 90-106 ◽  
Author(s):  
Martin Kadlec ◽  
Robin Hron ◽  
Timo Grieser
Keyword(s):  
Carbon Fibre ◽  
Failure Modes ◽  
Damage Tolerance ◽  
Impact Damage ◽  
Structural Response ◽  
Cost Effective ◽  
Content Type ◽  
The Cost ◽  
Impact Energies ◽  
The Impact

Purpose – T-sections of carbon fibre-reinforced composites are prone to delamination because they lack reinforcement through their thicknesses. The purpose of this paper is to present the structural response of cost-effective laminated T-sections when subjected to various types of loads and impacts. Design/methodology/approach – The core of the automated manufactured beams is analysed. Pull-off, flange tension, and flange bending were tested for specimens extracted from an I-beam. The failure processes for all of the specimens were investigated in detail, leading to the statistical evaluation of the failure modes. Findings – A correlation is apparent between the impact damage energy and certain fracture patterns. These results can be used to assess damage tolerance when designing stiffeners, beams, and various complex structures. The increase in strength by 25 per cent was measured for the advanced stitching located in the web section for the flange tension test. Originality/value – The resistance displayed by the T-sections toward impact damage was studied experimentally, as the literature describing this topic is limited. The prevalence of one fracture mode for higher impact energies shows a possible advantage of the cost-effective preforms for the damage tolerant philosophy.

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