Optical test results of carbon composite mirrors from MISSE 7A

2013 ◽  
Author(s):  
R. C. Romeo ◽  
R. N. Martin
Keyword(s):  
Carbon Composite ◽  
Test Results ◽  
Optical Test

INFLUENCE OF THE PYROLYTIC COMPACTION PROCESS ON THE PHYSICAL AND MECHANICAL PROPERTIES OF HIGH-DENSITY CARBON-CARBON COMPOSITE MATERIALS BASED ON PITCH MATRICES

2021 ◽  
pp. 3-9
Author(s):  
V. V. Kulakov ◽  
M. I. Pankov ◽  
V. A. Sivurova ◽  
M. S. Luchkin ◽  
A. K. Golubkov ◽  
...  
Keyword(s):  
Carbon Fibers ◽  
Initial Density ◽  
Physical And Mechanical Properties ◽  
Pyrolytic Carbon ◽  
Carbon Composite ◽  
Test Results ◽  
High Modulus ◽  
Compaction Process ◽  
Carbon Composite Materials ◽  
Density Values

The efficiency of the pyrolytic carbon compaction process by decomposing methane in samples of a carbon-carbon composite randomly reinforced with discrete high-modulus (graphitized) carbon fibers with different densities is investigated. The analysis of the test results of samples for determining the compressive strength, determining the densities of samples after compaction with pyrocarbon and after compaction by impregnation and carbonization under pressure is carried out. Scanning electron microscopy (SEM) was used to study the structure of material samples with different initial density values.

scholarly journals FCI PFM optical test results

2021 ◽  
Author(s):  
Julien Ouaknine ◽  
Catherine Gaudin-Delrieu ◽  
Arnaud Liotard ◽  
Alessandro Boni ◽  
Donny Aminou ◽  
...  
Keyword(s):  
Test Results ◽  
Optical Test

Ultrasonic Detection of Fiber Orientation in Composite Laminates for Use of Vehicular Structures

2005 ◽  
Vol 297-300 ◽  
pp. 2109-2114
Author(s):  
Je Woong Park ◽  
Kwang Hee Im ◽  
David K. Hsu ◽  
Seung Woo Na ◽  
Young Nam Kim ◽  
...  
Keyword(s):  
Fiber Orientation ◽  
Composite Laminates ◽  
Azimuthal Angle ◽  
Normal Incidence ◽  
Test Results ◽  
Ultrasonic Signals ◽  
Fiber Placement ◽  
Reinforced Plastics ◽  
Vector Decomposition ◽  
Optical Test

The layup of a CFRP (carbon-fiber reinforced plastics) composite laminates affects the properties of the laminate, including stiffness, strength and thermal behavior. It is very important to detect ply error before the laminate is cured for both manual procedure and fiber placement procedure. An ultrasonic technique would be very beneficial, which could be used to test the part after and before curing laminates and requires less time than the optical test. Also cross-polarized scan is very sensitive to the layup errors and ply misorientations. Scanners were set out for different measurement modalities for acquiring ultrasonic signals as a function of in-plane azimuthal angle. Firstly, a manual scanner was built for making transmission measurements using a pair of normal-incidence shear wave transducers to find the effect of fiber misorientations of composite laminates. Also a method for nondestructively determining the ply layup in a composite laminate is presented. The method employs a normal-incidence longitudinal ultrasound to perform C-scan of ply interfaces of the laminate. And a ply-by-ply vector decomposition model has been utilized for evaluating layup errors in composite laminates fabricated from unidirectional plies. Test results between after and before curing laminates with model data were compared for a fiber orientation of the laminates.

Optical test results of fast pnCCDs

2008 ◽  
Author(s):  
Sebastian Ihle ◽  
Robert Hartmann ◽  
Marc Downing ◽  
Lothar Struder ◽  
Sebastian Deiries ◽  
...  
Keyword(s):  
Test Results ◽  
Optical Test

Ultrasonic evaluation of ultra-high molecular weight polyethylene used in medical prostheses

1998 ◽  
Vol 212 (1) ◽  
pp. 65-69 ◽  
Author(s):  
C S Ong ◽  
N Saffari
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Ultrasonic Attenuation ◽  
Failure Mechanisms ◽  
Evaluation Process ◽  
Test Results ◽  
Ultrasonic Evaluation ◽  
Optical Test ◽  
Non Destructive ◽  
Ultra High Molecular Weight

An ultrasonic non-destructive evaluation process is established to observe cracks and delaminations that occur below the surface of retrieved ultra-high molecular weight polyethylene joints. The result from the ultrasonic evaluation is compared with destructive (optical) test results of the actual cracks. Feasibility of characterizing different grades of bulk polyethylene is also established by means of ultrasonic attenuation measurements in the materials. This ultrasonic data can be used to give a better understanding of the failure mechanisms in the UHMWPE material.

Using Conventional Articulation Tests With Highly Unintelligible Children

1992 ◽  
Vol 23 (1) ◽  
pp. 52-60 ◽  
Author(s):  
Pamela G. Garn-Nunn ◽  
Vicki Martin
Keyword(s):  
Test Results ◽  
Phonological Processes ◽  
Rule Based ◽  
Severity Level ◽  
Error Sensitivity ◽  
Conventional Tests ◽  
Severity Levels ◽  
Conventional Test ◽  
Impaired Children

This study explored whether or not standard administration and scoring of conventional articulation tests accurately identified children as phonologically disordered and whether or not information from these tests established severity level and programming needs. Results of standard scoring procedures from the Assessment of Phonological Processes-Revised, the Goldman-Fristoe Test of Articulation, the Photo Articulation Test, and the Weiss Comprehensive Articulation Test were compared for 20 phonologically impaired children. All tests identified the children as phonologically delayed/disordered, but the conventional tests failed to clearly and consistently differentiate varying severity levels. Conventional test results also showed limitations in error sensitivity, ease of computation for scoring procedures, and implications for remediation programming. The use of some type of rule-based analysis for phonologically impaired children is highly recommended.

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