Rowell, Roger M. Department of Biological Systems Engineering, University of Wisconsin, Madison, Wisconsin.
- Heating in the presence of moisture
- Heating in the presence of moisture and compression
- Heating dry wood
- Heating dry wood followed by compression
- Links to Primary Literature
- Additional Readings
It has long been known that heating wood will change its properties. In ancient Africa, natives hardened wood spears by placing a sharpened straight wood stick in the bottom of glowing coals and then pounded the burned end with a rock, repeating this process many times until the end was sharp and hard. The Vikings burned the outside of their ships to make them water-resistant and flame-retardant. In the early part of the twentieth century, it was found that drying wood at high temperature increased dimensional stability (resistance to swelling and shrinkage) and reduced hygroscopicity (ability to take up and retain moisture). Later, it was found that high-temperature drying also increased resistance to microbiological attack. At the same time, the increase in stability and durability increased brittleness and loss in some strength properties, including impact toughness (resistance against breaking after a sharp blow is applied), modulus of rupture (maximum surface stress in a bent beam at the instant of failure), and work to failure (the energy needed to cause fracture). The treatments usually caused a darkening of the wood, and the wood had a tendency to crack and split.
The content above is only an excerpt.
for your institution. Subscribe
To learn more about subscribing to AccessScience, or to request a no-risk trial of this award-winning scientific reference for your institution, fill in your information and a member of our Sales Team will contact you as soon as possible.
to your librarian. Recommend
Let your librarian know about the award-winning gateway to the most trustworthy and accurate scientific information.
AccessScience provides the most accurate and trustworthy scientific information available.
Recognized as an award-winning gateway to scientific knowledge, AccessScience is an amazing online resource that contains high-quality reference material written specifically for students. Contributors include more than 9000 highly qualified scientists and 43 Nobel Prize winners.
MORE THAN 8500 articles and Research Reviews covering all major scientific disciplines and encompassing the McGraw-Hill Encyclopedia of Science & Technology and McGraw-Hill Yearbook of Science & Technology
115,000-PLUS definitions from the McGraw-Hill Dictionary of Scientific and Technical Terms
3000 biographies of notable scientific figures
MORE THAN 19,000 downloadable images and animations illustrating key topics
ENGAGING VIDEOS highlighting the life and work of award-winning scientists
SUGGESTIONS FOR FURTHER STUDY and additional readings to guide students to deeper understanding and research
LINKS TO CITABLE LITERATURE help students expand their knowledge using primary sources of information