Azimuthally Scanned Angled-Beam Pulse-Echo Ultrasound for Characterization of Impact Damage in Composites

2020 ◽  
Vol 3 (3) ◽  
Author(s):  
John T. Welter ◽  
Daniel M. Sparkman ◽  
John C. Aldrin ◽  
David Zainey ◽  
Tyler Lesthaeghe ◽  
...  
Keyword(s):  
Polymer Matrix Composites ◽  
Impact Damage ◽  
Slow Crack Growth ◽  
Normal Incidence ◽  
Matrix Composites ◽  
Transverse Cracks ◽  
X Ray Computed ◽  
Ultrasound Inspection ◽  
Pulse Echo

Abstract Characterization of barely visible impact damage (BVID) in polymer matrix composites (PMCs) is necessary to use slow crack growth damage tolerance models and evaluate remaining life of PMC components. Azimuthally scanned angled-beam pulse-echo ultrasound is investigated as a complimentary technique to normal incidence ultrasound inspection of BVID in PMCs to characterize delamination fields. It is found that there is a correlation between signals present in the azimuthally scanned angled-beam pulse-echo ultrasound C-scans and transverse cracks seen in X-ray computed tomography inspection. These transverse cracks are not readily identifiable as transverse cracks in normal incidence C-scan inspection.

scholarly journals Viscoelastic Characterization of Short Fibres Reinforced Thermoplastic in Tension and Shearing

2010 ◽  
Vol 24-25 ◽  
pp. 419-423 ◽  
Author(s):  
A. Andriyana ◽  
Luisa Silva ◽  
Noelle Billon
Keyword(s):  
Mechanical Response ◽  
Polymer Matrix Composites ◽  
Mechanical Analysis ◽  
Integrated Modelling ◽  
Matrix Composites ◽  
Moulding Process ◽  
Permanent Strain ◽  
Mould Filling ◽  
Injection Moulding Process

The present work can be regarded as a first step toward an integrated modelling of mould filling during injection moulding process of polymer matrix composites and the resulting material behaviour under service loading conditions. More precisely, the emphasis of the present research is laid on the development of a mechanical model which takes into account the processing-induced microstructure and is capable to predict the mechanical response of the material. In the Part I, a set of experiments which captures the mechanical behaviour of an injection moulded short fibre reinforced under different strain histories is described. Three mechanical testing are conducted: Dynamic Mechanical Analysis (DMA), uniaxial tension and simple shear. Tests show that the material exhibits complex responses mainly due to non-linearity, anisotropy, time/rate-dependence, hysteresis and permanent strain. Moreover, the relaxed state of the material is characterized by the existence of a so-called anisotropic equilibrium hysteresis independently of the prescribed strain rate.

X-ray computed microtomography of internal damage in fiber reinforced polymer matrix composites

2005 ◽  
Vol 65 (14) ◽  
pp. 2071-2078 ◽  
Author(s):  
Paul J. Schilling ◽  
BhanuPrakash R. Karedla ◽  
Arun K. Tatiparthi ◽  
Melody A. Verges ◽  
Paul D. Herrington
Keyword(s):  
Polymer Matrix ◽  
Polymer Matrix Composites ◽  
Fiber Reinforced Polymer ◽  
Matrix Composites ◽  
Fiber Reinforced ◽  
Internal Damage ◽  
X Ray ◽  
Reinforced Polymer ◽  
Computed Microtomography ◽  
X Ray Computed
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