An Acousto-Ultrasonic Method for Evaluating Wood Products

1988 ◽  
pp. 301-303
Author(s):  
Marcia Patton-Mallory ◽  
Kent D. Anderson
Keyword(s):  
Ultrasonic Method ◽  
Wood Products

Effect of dilution on compressibility of naproxen in acetonitrile studied by ultrasonic method

2006 ◽  
Vol 137 ◽  
pp. 219-222 ◽  
Author(s):  
W. Marczak ◽  
T. Kowalska ◽  
M. Bucek ◽  
D. Piotrowski ◽  
M. Sajewicz
Keyword(s):  
Ultrasonic Method

Non-Destructive Testing of Thermoplastic Carbon Composite Structures

2020 ◽  
Vol 2020 (1) ◽  
pp. 34-52
Author(s):  
Rafał Szymański
Keyword(s):  
Composite Structures ◽  
Ultrasonic Method ◽  
Composite Panel ◽  
Aviation Industry ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Pulse Technique ◽  
Thermoplastic Matrix ◽  
The Subject ◽  
Non Destructive

AbstractThe article is in line with the contemporary interests of companies from the aviation industry. It describes thermoplastic material and inspection techniques used in leading aviation companies. The subject matter of non-destructive testing currently used in aircraft inspections of composite structures is approximated and each of the methods used is briefly described. The characteristics of carbon preimpregnates in thermoplastic matrix are also presented, as well as types of thermoplastic materials and examples of their application in surface ship construction. The advantages, disadvantages and limitations for these materials are listed. The focus was put on the explanation of the ultrasonic method, which is the most commonly used method during the inspection of composite structures at the production and exploitation stage. Describing the ultrasonic method, the focus was put on echo pulse technique and the use of modern Phased Array heads. Incompatibilities most frequently occurring and detected in composite materials with thermosetting and thermoplastic matrix were listed and described. A thermoplastic flat composite panel made of carbon pre-impregnate in a high-temperature matrix (over 300°C), which was the subject of the study, was described. The results of non-destructive testing (ultrasonic method) of thermoplastic panel were presented and conclusions were drawn.

A Practical Ultrasonic Inspection Method for Detecting and Characterising Defects Found Within Composite Repairs

2018 ◽  
Author(s):  
J Downing ◽  
A Hook
Keyword(s):  
Wall Thickness ◽  
Steel Substrate ◽  
Ultrasonic Method ◽  
Ultrasonic Inspection ◽  
Heat Exposure ◽  
Matrix Cracking ◽  
Ultrasonic Technique ◽  
Inspection Method ◽  
Composite Repairs ◽  
Layered Matrix

Two steel substrate test panels were developed to represent common plate thicknesses found on naval vessels and scanned using the Babcock developed ultrasonic technique. One sample comprised of a series of slotted surface breaking flaws of varying widths and through thicknesses to represent fracturing/cracking. The inspection method detected simulated cracking to a depth of 2mm and 0.5mm in width. The second sample included numerous loss of wall thickness areas of varying diameters and through thicknesses, with the smallest detectable loss of wall thickness being 0.1mm at a 15mm diameter. After proving confidence in detection, there was a need to characterise flaws to provide support and ascertain a repair action. Samples were produced that were subjected to either impact or heat exposure to induce realistic representative damage. The practical ultrasonic method was successfully used to independently characterise between the samples, with induced de-laminations caused by blisters, and multi layered matrix cracking caused by varying levels of projectile impacts, due to their unique morphology.

STRESS MEASUREMENTS IN RAILWAY RAILS USING THE ULTRASONIC METHOD

2019 ◽  
Author(s):  
Shirley García ◽  
Thairon Reis ◽  
Auteliano Antunes dos Santos Junior
Keyword(s):  
Ultrasonic Method ◽  
Stress Measurements

Residential tornado safe room from commodity wood products – impact and wind pressure testing

2018 ◽  
Author(s):  
Robert H. Falk ◽  
James J. Bridwell ◽  
C. Adam Senalik ◽  
Marshall Begel
Keyword(s):  
Wood Products ◽  
Wind Pressure ◽  
Pressure Testing

Der Spielraum bei der Vermarktung von Waldleistungen ist eingeschränkt (Essay) | The scope for the commercialization of forest services is limited (essay)

2009 ◽  
Vol 160 (8) ◽  
pp. 228-231
Author(s):  
Hansruedi Walther
Keyword(s):  
Private Property ◽  
Legal Framework ◽  
Third Parties ◽  
Wood Products ◽  
Forest Owner ◽  
Free Access ◽  
School Class ◽  
Market Niche ◽  
The Right ◽  
Exclusive Right

A forest owner can only commercialize non-wood products and services within a tightly restricted market niche. On account of free access being permitted to the forest it is impossible to deny to third parties the consumption of many non-wood products and services: everybody has the right to be in the forest for recreation. As a result many non-wood services cannot be commercialized by the forest owner, or not exclusively. What would seem unthinkable elsewhere on private property seems to be taken for granted in the forest: third parties may take products from the forest and even sell them without being the forest owners. For certain nonwood services or products, such as the installation of rope parks or for burial in the forest, the organizer must conclude an agreement with the forest owner or draw up a contract for servitude or benefit. In addition, for these activities a permit from the Forestry Department is necessary. On the other hand, for an itinerant school class or for the production of forest honey neither a binding regulation with the forest owner nor a permit from the Forestry service is necessary, provided that no constructions are erected in the forest. The only exclusive right which remains to the forest owner, besides the sale of his property, is the exploitation of his trees within the legal framework.

Sign in / Sign up

Export Citation Format

Share Document