Banner for LabNotes
From Lab Notes
Contact Information
Forest Products Laboratory
One Gifford Pinchot Drive
Madison, WI 53726-2398
Phone: (608) 231-9200
Fax: (608) 231-9592


You are here: FPL Home  / Information Products & Services  / Publications

Requested Product

Title: Method for quantifying percentage wood failure in block-shear specimens by a laser scanning profilometer

Source: Journal of ASTM international. Vol. 2, no. 8 (Sept. 2005): pages [1]-10.

Author(s)Scott, C. T.; Hernandez, R.; Frihart, C.; Gleisner, R.; Tice, T.

Publication Year: 2005  View PDF »

Category: Journal Articles

Abstract: A new method for quantifying percentage wood failure of an adhesively bonded block-shear specimen has been developed. This method incorporates a laser displacement gage with an automated two-axis positioning system that functions as a highly sensitive profilometer. The failed specimen is continuously scanned across its width to obtain a surface failure profile. The laser is then moved incrementally along the length of the specimen and repeatedly scanned to obtain a three-dimensional digital profile of the surface. This digital profile can then be reconstructed and analyzed with appropriate software. Special algorithms are used to quantify percentage wood failure and degree of wood failure (depth of wood failure) and to recognize various surface anomalies, such as bondline voids (air bubbles). This paper presents exploratory data on several different types of wood failure and correlates these measurements to visual inspections of experienced observers. The device is very sensitive to most observed failures, particularly those with deep wood failure. However, shallow failures close to the bondline can be problematic. The algorithms allow a 'roughness' tolerance to be specified to characterize these surfaces. This new method will be useful for automating measurement of wood failure in block-shear specimens with good precision and repeatability.

Keywords: Shear, adhesion, adhesives, profilometer, surface roughness, laser scanning profilometer, adhesives, strength, bonding, failures in wood, bond strength

File size: 171 kb(s)

This publication is also viewable on Treesearch:  view
RITS Product ID: 12134
Current FPL Scientist associated with this product
Frihart, Charles R.
Research Chemist

Additional items that might interest you
View the video celebrating FPL's 100 years of public service in 2010, from the producers of the Greatest Good....view

Research Highlights from FPL....view

Termite Eradication: A search for the Holy Grail.... view

Moisture Management in Residential Construction Series videos...view

Wood Floor Systems in Residential Construction Series videos....view
- FPL's Mission and Strategic Plan -

FPL's mission is to identify and conduct innovative wood and fiber utilization research that contributes to conservation and productivity of the forest resource, thereby sustaining forests, the economy, and quality of life. ... ..more »

- FPL Research Emphasis Areas -
Advanced Composites

As an integral part of the FPL mission, we improve the long-term sustainability of our Nation's forests by creating valuable composite products from biobased materials ... ..more »

Advanced Structures

The FPL has been in the forefront of wood-frame housing research since 1910 and has long been recognized as a world leader in such housing-related areas as engineered wood ... ..more »

Forest Biorefinery

We all know the compelling reasons that the United States needs to reduce its dependence on fossil fuels. Historically, the greatest increases in energy demand have been for transportation fuels ... ..more »


A leader in wood products research for over a century, the FPL is positioning itself to become the lead Federal research facility for the application of nanotechnology in forest products ... more »

Woody Biomass Utilization

Forests in the United States contain a substantial amount of small-diameter, overstocked, and underutilized material.FPL research projects are exploring the potential of the small-diameter ... ..more »