scholarly journals Non destructive inspection of aerospace composites by a fiber-coupled laser ultrasonics system

2017 ◽  
Author(s):  
Jean-François Vandenrijt ◽  
Fabian Languy ◽  
Cédric Thizy ◽  
Marc P. Georges
Keyword(s):  
Laser Ultrasonics ◽  
Non Destructive

Determining elastic properties of sedimentary strata in terms of limestone samples by laser ultrasonics

2020 ◽  
pp. 125-134
Author(s):  
I. A. Shibaev ◽  
V. A. Vinnikov ◽  
G. D. Stepanov
Keyword(s):  
Physical And Mechanical Properties ◽  
Laser Ultrasonics ◽  
Compression Tests ◽  
S Waves ◽  
Static Modulus ◽  
Enhance Efficiency ◽  
Static Modulus Of Elasticity ◽  
Static Elastic Moduli ◽  
Non Destructive ◽  
Moduli Of Elasticity

Geological engineering often uses geomechanical modeling aimed to enhance efficiency of mining or performance of structures. One of the input parameters for such models are the static elastic moduli of rocks. This article presents the studies into the physical and mechanical properties of rocks-limestone of non-metamorphic diagenesis. The precision measurements of Pand S-waves are carried out to an accuracy of 0.2% by laser ultrasonics. The static moduli of elasticity and the deformation characteristics of rocks are determined in the uniaxial compression tests by the standards of GOST 21153.2-84 and GOST 28985-91, respectively. The correlation dependence is found between the static and dynamic elasticity moduli in limestone samples. The found correlation allows drawing the conclusion that the static modulus of elasticity can be estimated in non-destructive tests, which largely simplifies preliminary diagnostics of samples in case of limited number of test core.

scholarly journals Laser-excited elastic guided waves reveal the complex mechanics of nanoporous silicon

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Marc Thelen ◽  
Nicolas Bochud ◽  
Manuel Brinker ◽  
Claire Prada ◽  
Patrick Huber
Keyword(s):  
Guided Waves ◽  
Laser Ultrasonics ◽  
Bulk Silicon ◽  
Nanoporous Silicon ◽  
Stiffness Reduction ◽  
Mechanical Characterisation ◽  
Isotropic Elasticity ◽  
On Chip ◽  
Non Destructive

AbstractNanoporosity in silicon leads to completely new functionalities of this mainstream semiconductor. A difficult to assess mechanics has however significantly limited its application in fields ranging from nanofluidics and biosensorics to drug delivery, energy storage and photonics. Here, we present a study on laser-excited elastic guided waves detected contactless and non-destructively in dry and liquid-infused single-crystalline porous silicon. These experiments reveal that the self-organised formation of 100 billions of parallel nanopores per square centimetre cross section results in a nearly isotropic elasticity perpendicular to the pore axes and an 80% effective stiffness reduction, altogether leading to significant deviations from the cubic anisotropy observed in bulk silicon. Our thorough assessment of the wafer-scale mechanics of nanoporous silicon provides the base for predictive applications in robust on-chip devices and evidences that recent breakthroughs in laser ultrasonics open up entirely new frontiers for in-situ, non-destructive mechanical characterisation of dry and liquid-functionalised porous materials.

Non-destructive Detection of Small Blowholes in Aluminum by Using Laser Ultrasonics Technique

2014 ◽  
Vol 36 (5-6) ◽  
pp. 1181-1188 ◽  
Author(s):  
Kaihua Sun ◽  
Zhonghua Shen ◽  
Yifei Shi ◽  
Zhihong Xu ◽  
Ling Yuan ◽  
...  
Keyword(s):  
Laser Ultrasonics ◽  
Non Destructive

scholarly journals Imaging Material Texture of As-Deposited Selective Laser Melted Parts Using Spatially Resolved Acoustic Spectroscopy

2018 ◽  
Vol 8 (10) ◽  
pp. 1991 ◽  
Author(s):  
Rikesh Patel ◽  
Matthias Hirsch ◽  
Paul Dryburgh ◽  
Don Pieris ◽  
Samuel Achamfuo-Yeboah ◽  
...  
Keyword(s):  
Additive Manufacturing ◽  
Acoustic Waves ◽  
Surface Acoustic Waves ◽  
Laser Ultrasonics ◽  
Structural Defects ◽  
Spatially Resolved ◽  
Acoustic Spectroscopy ◽  
Material Texture ◽  
Ultrasound Inspection ◽  
Non Destructive

Additive manufacturing (AM) is a production technology where material is accumulated to create a structure, often through added shaped layers. The major advantage of additive manufacturing is in creating unique and complex parts for use in areas where conventional manufacturing reaches its limitations. However, the current class of AM systems produce parts that contain structural defects (e.g., cracks and pores) which is not compatible with certification in high value industries. The probable complexity of an AM design increases the difficulty of using many non-destructive evaluation (NDE) techniques to inspect AM parts—however, a unique opportunity exists to interrogate a part during production using a rapid surface based technique. Spatially resolved acoustic spectroscopy (SRAS) is a laser ultrasound inspection technique used to image material microstructure of metals and alloys. SRAS generates and detects `controlled’ surface acoustic waves (SAWs) using lasers, which makes it a non-contact and non-destructive technique. The technique is also sensitive to surface and subsurface voids. Work until now has been on imaging the texture information of selective laser melted (SLM) parts once prepared (i.e., polished with R a < 0 . 1 μ m)—the challenge for performing laser ultrasonics in-process is measuring waves on the rough surfaces present on as-deposited parts. This paper presents the results of a prototype SRAS system, developed using the rough surface ultrasound detector known as speckle knife edge detector (SKED)—texture images using this setup of an as-deposited Ti64 SLM sample, with a surface roughness of S a ≈ 6 μ m, were obtained.

scholarly journals Software-defined laser ultrasonics: non-destructive testing

2019 ◽  
Author(s):  
Klaus Hass ◽  
Lucas Riobo ◽  
Gerardo Gonzalez ◽  
Francisco E. Veiras ◽  
Fernando L. Perez-Quintian
Keyword(s):  
Laser Ultrasonics ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Non Destructive
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