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Saturday, May 9, 2020 | History

4 edition of Nondestructive methods for detecting defects in softwood logs found in the catalog.

Nondestructive methods for detecting defects in softwood logs

Nondestructive methods for detecting defects in softwood logs

  • 72 Want to read
  • 17 Currently reading

Published by U.S. Dept. of Agriculture, Forest Service, Forest Products Laboratory in Madison, Wis .
Written in English

    Subjects:
  • Nondestructive testing,
  • Wood -- Defects

  • Edition Notes

    Other titlesDetecting defects in softwood logs
    StatementKristin C. Schad, Daniel L. Schmoldt, Robert J. Ross
    SeriesResearch paper FPL -- RP-546, Research paper FPL -- 546
    ContributionsSchmoldt, Daniel L. 1953-, Ross, Robert J., Forest Products Laboratory (U.S.)
    The Physical Object
    FormatMicroform
    Pagination13 p.
    Number of Pages13
    ID Numbers
    Open LibraryOL13622536M
    OCLC/WorldCa37465868

    An object detection method of ground-penetrating radar (GPR) signals using empirical mode decomposition (EMD) and dynamic time warping (DTW) is proposed in this study. Two groups of timber specimens were examined. The first group comprised of Douglas fir (Pseudotsuga menziesii) timber sections prepared in the laboratory with inserts of known internal : Xi Wu, Christopher Adam Senalik, James Wacker, Xiping Wang, Guanghui Li. All of the four NDT methods detect defects in slightly different directions and based on different physical principles. The four methods are therefore supplements to each other in inspection of different parts of the disposal canister. Jäppinen, Tarja. / Non-destructive evaluation of the spent nuclear fuel disposal canisters. Baltica X Author: Ari Koskinen, Tarja Jäppinen.

    A novel feature-based tracking approach to the detection, localization, and 3-D reconstruction of internal defects in hardwood logs using computer tomography. Pattern Anal. Appl. 9 (2–3): Crossref, Cited by: Non-destructive evaluation (NDE) is defined by Pellerin and Ross [] as: “The science of identifying the physical and mechanical properties of a piece of material without altering its end-use capabilities and then using this information to make decisions regarding appropriate applications”.NDE is a critical feature of numerous industries and has a long history of ensuring product quality Cited by: 2.

    Categories: External vs. Internal Softwood vs. Hardwood CT/X-ray, MRI, Ultrasound, Microwave, Laser Scanning Detection methods on hardwood and softwood very different Most research groups focus on internal Various systems over a few decades Large and accurate data Problems and difficulties External defect detection is relatively new Data.   Brdicko () describes a method for the detection and measurement of radial checks on the outer surface of pine logs that were killed by the mountain pine beetle. He concludes that with a six-view X-ray scanner it is possible to detect and characterize larger checks and to use the information for a value-based optimization of lumber recovery.


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Nondestructive methods for detecting defects in softwood logs Download PDF EPUB FB2

Nondestructive methods for detecting defects in softwood logs. Res. Pap. FPL–RP– Madison, WI: U.S. Department of Agriculture, Forest Service, Forest Products Laboratory.

13 p. A limited number of free copies of this publication are available to the public from the Forest Products Laboratory, One Gifford Pinchot Drive, Madison, WI Cited by: Nondestructive methods for detecting defects in softwood logs. [Kristin C Schad; Daniel L Schmoldt; Robert J Ross; Forest Products Laboratory (U.S.)] -- Wood degradation and defects, such as voids and knots, affect the quality and processing time of lumber.

The ability to detect internal defects in the log can save mills time and processing costs. Nondestructive methods for detecting defects in softwood logs (OCoLC) Material Type: Document, Government publication, National government publication, Internet resource: Document Type: Internet Resource, Computer File: All Authors / Contributors: Kristin C Schad; Daniel L Schmoldt; Robert J Ross; Forest Products Laboratory (U.S.).

The principles of the stress wave timing method for decay detection in standing timber have been provided by Wang et al. In field applications, this nondestructive testing procedure is also referred to as single‐path stress wave timing by: 1.

Nondestructive methods for detecting defects in softwood logs. Research Paper FPL-RP, Forest Products Laboratory, Forest Service, United States Department of Cited by: 1.

In order to detect defects and to increase the lifetime of timber structures nondestructive methods are developed to monitor and assess their condition. Timber and wood can be characterized nondestructively and in many cases contactless with diverse methods.

This paper gives a short overview on some nondestructive methods based on electromagnetic effects: microwave/radar, nuclear magnetic Cited by: 2.

The elm wood samples were tested by the technique of ultrasonic, and the testing results were analyzed by using the statistic software of SPSS. The results showed that the moister content of wood, wood crack, the sizes of holes and numbers of holes have significant influence on propagation parameters and dynamic modulus of elasticity.

If there are holes or cracks in the propagation path, the Cited by: 1. The book describes NDT methods in general, their applications for the evaluation and inspection of aerospace materials or components, the types of information they provide and how such information.

Fig. 3 shows the results of detecting internal defects in the specimen by using the electromagnetic method. As a result of detecting internal defects in the concrete of the specimen by using the electromagnetic method, the styrofoam, the wood and the PVC pipe could not be detected, and the sheath tube appeared to be similar to the steel bar.

Abstract. This paper presents an original problem of knot detection in 3D X-ray Computer Tomography images of wood stems. This image type is very different from classical medical images and presents specific geometric by: Ultrasonic detection of defects in wood D.

Makow* Pulsed ultrasound with water coupling has been used to detect knots, rot, shakes and pitch in samples of wood. This paper discusses the characteristic echo patterns which are obtained. The technique may find use in the lumber and wood by: 2.

One important method that should not be underestimated is visual testing of rails (VT). Another important inspection method for the evaluation of internal rail defects is ultrasonic testing (UT).

Lastly the eddy current testing (ET) method is used for the detection of surface defects. Nondestructive testing methods permit inspection of the detection, by ultrasonic testing, of internal defects in it.

Lee 37 (6) used the ultrasonic technique to test the structural safety of the damaged roof of an 18th-century mansion. Jensen (7). This paper is concerned with the detection of internal defects in hardwood logs.

Because the commercial value of hardwood lumber is directly related to the quantity, type, and location of defects in the wood, sawing strategies are typically chosen in an attempt to minimize the defects Cited by: 9.

This paper provides a review on the use of acoustics to measure stiffness of standing trees, stems, and logs. An outline is given of the properties of wood and how these are related to stiffness and acoustic velocity throughout the tree.

Factors are described that influence the speed of sound in wood, including the different types of acoustic waves which propagate in tree stems and by: The deterioration of concrete structures in the last few decades calls for effective methods for condition evaluation and maintenance. This resulted in development of several nondestructive testing (NDT) techniques for monitoring civil infrastructures.

NDT methods have been used for more than three decades for monitoring concrete structures; now it has been recognized that NDT plays an Cited by: Nondestructive techniques have also found application in the evaluation of existing wood buildings and built-up components and in the periodic inspection of other essential facilities and structures such as wood utility poles, cooling towers.

dock piling and piers, scaffold planks, and mine timbers. Nondestructive testing (NDT) is a wide group of analysis techniques used in science and technology industry to evaluate the properties of a material, component or system without causing damage.

The terms nondestructive examination (NDE), nondestructive inspection (NDI), and nondestructive evaluation (NDE) are also commonly used to describe this technology. Canadian Journal of Forest Research,49(12):Bhandarkar SM, Faust TD, Tang M.

CATALOG: a system for detection and rendering of internal log defects using computer tomography. Machine Vision Nondestructive methods for detecting defects in softwood logs. USDA For. Serv. Res. Pap. FPL-RP Crossref, Author: Denis Belley, Isabelle Duchesne, Steve Vallerand, Julie Barrette, Michel Beaudoin.

For concrete bridge decks, this method is most appropriate to provide rapid defect (especially delamination) detection.

A comparison of different nondestructive evaluation techniques by Popovics () found the infrared imaging and impact-echo methods to be the most suitable techniques to evaluate delamination.

While this suggests the pulse-echo scanning method is the most promising technique for the detection of defects, it is also evident that the nature of the defects themselves is not immediately obvious from visual inspection of the output from this technique and training would be required to enhance an operator’s ability to interpret results.Liquid penetrant testing is a non-destructive method used to detect surface breaking defects in any nonporous material.

The surface of the part under evaluation is coated with a penetrant in which a visible or fluorescent dye is dissolved.

The penetrant is pulled into surface defects by capillary action.defects. The nondestructive (indirect) methods such as ultrasound or stress wave analysis can play a role in minimizing the errors. References 1. Kasal, B., Semi-destructive method for in-situ evaluation of compressive strength of wood structural members, Forest Products Journal, (in print) 2.

ASTM. Annual Book of ASTM Standards, Section 4.