Experimental Tests of Fatigue Induced Delamination in Gfrp and Cfrp Laminates

2007 ◽  
pp. 117-118 ◽  
Author(s):  
D. Tumino ◽  
G. Catalanotti ◽  
F. Cappello ◽  
B. Zuccarello
Keyword(s):  
Experimental Tests ◽  
Cfrp Laminates

Evaluation of Low Velocity Impact Response of Carbon Fiber Reinforced Composites

2018 ◽  
Vol 779 ◽  
pp. 3-10
Author(s):  
Mihaela Raluca Condruz ◽  
Alexandru Paraschiv ◽  
Ionuț Sebastian Vintilă ◽  
Mihail Sima ◽  
Andreea Deutschlander ◽  
...  
Keyword(s):  
Polymeric Composite ◽  
Experimental Tests ◽  
Impact Testing ◽  
Impact Response ◽  
Low Velocity Impact ◽  
Specimen Thickness ◽  
Fiber Reinforced ◽  
Low Velocity ◽  
Cfrp Laminates ◽  
The Impact

The analysis of damage resulted from concentrated out-of-plane impact forces is a concern in case of fiber reinforced polymeric composite aerostructures. Thereby, it can be quantified in terms of resulting size/damage type by drop weight impact testing. The aim of the present research was to evaluate the impact response of CFRP laminates by FEA and experimental tests. For FEA, two failure criterions were used, energetic criterion and Tsai Wu criterion. In both modeling scenarios the laminate was fractured. In case of the energetic criterion it was observed a meandering crack along with internal delamination of the material plies, while in case of the Tsai Wu criterion the impactor passes through the specimen, destroying the impacted area. Experimental tests performed at 0.7 meters height and 33 J of impact energy showed that all material plies were visible damaged, but the impactor didn’t pass through all specimen thickness. Different damage modes were observed on the tested specimens, the impacted face of the specimen presented a combined damage consisting in large cracks with fiber breakage indentation/puncture and a dent while on the non-impacted side of the specimen splits, cracks and a small swelling were observed. Considering the results from FEA and experimental tests, it can be said that regarding the damage shape, the experimental results are in a good agreement with a combination of the results obtained from the two failure models of FEA.

scholarly journals Experimental tests of post-tensioned girders strengthened with prestressed CFRP composites

2014 ◽  
Vol 13 (3) ◽  
pp. 159-166
Author(s):  
Michał Staśkiewicz ◽  
Renata Kotynia ◽  
Julien Michels ◽  
Christoph Czaderski ◽  
Masoud Motavalli
Keyword(s):  
Materials Science ◽  
Load Capacity ◽  
Experimental Tests ◽  
Field Application ◽  
Flexural Strengthening ◽  
Cfrp Laminates ◽  
University Of Technology ◽  
Federal Laboratories ◽  
Real Scale ◽  
Post Tensioned

The paper presents a research carried out within the framework of the Polish-Swiss “Tulcoempa” project, carried out by Lodz University of Technology and EMPA Swiss Federal Laboratories for Materials Science and Technology. The main goal of the project was to perform the first field application of an innovative, anchorless flexural strengthening with use of prestressed CFRP laminates on an existing bridge in Poland. Laboratory tests were conducted to verify the efficiency of the strengthening of two real-scale, 18.4m long, post-tensioned bridge girders reconstructed at EMPA institute. Flexural strengthening was successful and resulted in an increase of the member’s load capacity by 24% and reduction of the midspan deflection by more than 60%.

On the Tensile Behaviour of CF and CFRP Materials under High Strain Rates

2017 ◽  
Vol 754 ◽  
pp. 111-114 ◽  
Author(s):  
A. de Luca ◽  
F. di Caprio ◽  
E. Milella ◽  
G. Lamanna ◽  
M. Ignarra ◽  
...  
Keyword(s):  
Strain Rate ◽  
Experimental Tests ◽  
Tensile Tests ◽  
Failure Criteria ◽  
Analytical Models ◽  
Tensile Behaviour ◽  
Strain Rate Effects ◽  
Cfrp Laminates ◽  
Carbon Fibre Reinforced Polymer ◽  
Dynamic Loading Conditions

The paper deals with dynamic tensile tests on Carbon Fibre Reinforced Polymer – CFRP laminates. As a result of their viscoelastic nature, plastics exhibit rate dependence in their stress-strain response. The need to develop failure criteria to determine the dynamic failure stress for composite material under dynamic loading conditions is a current challenge for the research community. The main goal of such paper is to assess the efficiency of the analytical models provided by literature to predict the strain-rate effects on composite coupons tensile strength. Moreover, experimental tests have been performed in order to evaluate the mechanical behaviour of different stacking sequences at different strain rate.

Randomized Experimental Tests of Mediation Models

2011 ◽  
Author(s):  
Charles E. Lance ◽  
Richard P. DeShon ◽  
Eugene Stone-Romero
Keyword(s):  
Experimental Tests ◽  
Mediation Models

Experimental tests on bracing type pure aluminum shear panels

2007 ◽  
Vol 2 (3) ◽  
pp. 73-84 ◽  
Author(s):  
Giuseppe Brando
Keyword(s):  
Pure Aluminum ◽  
Experimental Tests

Avalanche Stratification - Experimental Tests of the “Metastable Wedge” and “Continuous Flow” Models

2000 ◽  
Vol 627 ◽  
Author(s):  
M. E. Swanson ◽  
M. Landreman ◽  
J. Michel ◽  
J. Kakalios
Keyword(s):  
Continuous Flow ◽  
Granular Media ◽  
Experimental Tests ◽  
Coarse Sand ◽  
Angle Of Repose ◽  
Flow Models ◽  
Maximum Angle ◽  
Stratification Effect ◽  
Upward Moving ◽  
Moving Layer

ABSTRACTWhen an initially homogeneous binary mixture of granular media such as fine and coarse sand is poured near the closed edge of a “quasi-two-dimensional” Hele-Shaw cell consisting of two vertical transparent plates held a narrow distance apart, the mixture spontaneously forms alternating segregated layers. Experimental measurements of this stratification effect are reported in order to determine which model, one which suggests that segregation only occurs when the granular material contained within a metastable heap between the critical and maximum angle of repose avalanches down the free surface, or one for which the segregation results from smaller particles becoming trapped in the top surface and being removed from the moving layer during continuous flow. The result reported here indicate that the Metastable Wedge model provides a natural explanation for the initial mixed zone which precedes the formation of the layers, while the Continuous Flow model explains the observed upward moving kink of segregated material for higher granular flux rates, and that both mechansims are necessary in order to understand the observed pairing of segregated layersfor intermediate flow rates and cell separations.

Automatic Tread Gaging Machine

1979 ◽  
Vol 7 (1) ◽  
pp. 31-39
Author(s):  
G. S. Ludwig ◽  
F. C. Brenner
Keyword(s):  
Experimental Tests ◽  
Automatic Machine ◽  
Wear Rates ◽  
Handling Device ◽  
Straight Line ◽  
Component Systems ◽  
Before And After ◽  
Good Repeatability ◽  
The Difference ◽  
Straight Lines

Abstract An automatic tread gaging machine has been developed. It consists of three component systems: (1) a laser gaging head, (2) a tire handling device, and (3) a computer that controls the movement of the tire handling machine, processes the data, and computes the least-squares straight line from which a wear rate may be estimated. Experimental tests show that the machine has good repeatability. In comparisons with measurements obtained by a hand gage, the automatic machine gives smaller average groove depths. The difference before and after a period of wear for both methods of measurement are the same. Wear rates estimated from the slopes of straight lines fitted to both sets of data are not significantly different.

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