2 edition of Evaluating shrinkage of wood propellers in a high-temperature environment found in the catalog.
Evaluating shrinkage of wood propellers in a high-temperature environment
Minimizing wood shrinkage is a priority for many wood products in use, particularly engineered products manufactured to close tolerances, such as wood propellers for unmanned surveillance aircraft used in military operations. Those currently in service in the Middle East are experiencing performance problems as a consequence of wood shrinking during long-term storage at low equilibrium moisture content conditions prior to installation. To evaluate the extent of shrinkage, seven sugar maple (Acer saccharum) veneer propellers were dried from 11% to 3% moisture content in a controlled environment of 150°F (65°C) for 3 days. Two of these wood propellers were encased in polyethylene bags. Results showed 5 to 20 times more shrinkage for the thickness of the propeller hub and the hub face perpendicular to the propeller blades (across the grain), respectively, compared with the hub face parallel to the blades (along the grain). Two hubs, coated with aluminum oxide paint, showed dimensional changes similar to those observed for uncoated hubs. For the two wood propellers encased in polyethylene bags, moisture loss was slowed during the course of the experiment by roughly 46%. Wrapping the wood propellers prior to shipping would slow moisture desorption, thereby minimizing shrinkage during short-term storage. Processing the propellers at a lower equilibrium moisture content would minimize shrinkage during long-term storage.
|Statement||Richard Bergman, Robert J. Ross.|
|Series||Research note FPL -- 0309|
|Contributions||Ross, Robert J., Forest Products Laboratory (U.S.)|
|LC Classifications||SD433 .B47 2008|
|The Physical Object|
|Pagination||7 p. :|
|LC Control Number||2008412900|
high-temperature water, as indicated by the triangular points in Fig. 2. The influence of grain-boundary Cr content on IG cracking is not affected by P segregation (⬃10 at%). These results are consistent with the crack-growth-rate tests of Andresen and Briant (14), who found that grain-boundary P (and N) enrichment did. This paper investigates the effects of thermal treatment of birch with respect to colour and strength. Birch wood was treated at °C and °C for 0 h, 1 h, 3 h and 10 h. In bending-strength Cited by:
Wood pulp consumption in paper doubled between and ; in the same period, paper stock consumption increased only 34 percent, while consumption of other fibrous materials declined slightly. Thus, the use of wood pulp grew at three times the rate of paper stock. This book also looks ahead to future developments and "best practices" for the future. If you're charged with making or evaluating transportation security decisions, you'll find the tools you need to succeed -- and prosper -- with the Total Security Management approach. McGraw-Hill is interested in reviewing manuscript for publication.
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Bergman, Richard; Ross, Robert J. Evaluating shrinkage of wood propellers in a high-temperature environment. Research Note FPL-RN Madison, WI: U.S. Department of Agriculture, Forest Service, Forest Products Laboratory.
7 p. A limited number of free copies of this publication are available to the. Evaluating shrinkage of wood propellers in a high-temperature environment 7 p. (OCoLC) Online version: Bergman, Richard (Richard D.).
Evaluating shrinkage of wood propellers in a high-temperature environment. Madison, WI: Forest Products Laboratory,  (OCoLC) Material Type. Evaluating shrinkage of wood propellers in a high-temperature environment 7 p.
(OCoLC) Material Type: Document, Government publication, National government publication, Internet resource: Document Type: Internet Resource, Computer File: All Authors / Contributors: Richard Bergman; Robert J Ross; Forest Products Laboratory (U.S.).
Rick's major research objectives include: 1) developing life-cycle assessment (LCA) data and conducting comparative LCAs for wood products and bioenergy systems and 2). Evaluating shrinkage of wood propellers in a high-temperature environment by: Bergman, Richard Published: () Experimental evaluation of the creep behavior of wood I-joists with web openings exposed to various humidity conditions / by: Runyen, Richard W.
Published: (). Robert Jon Ross. US Forest Service Book. Jun ; Distributions of MOE and MOR in Eight Mill-Run Lumber Populations (Four Mills at Two Times) Evaluating Shrinkage of Wood Propellers in a.
High-temperature dielectric properties of candidate space-shuttle thermal-protection-system and antenna-window materials (NASA technical note) [Gilreath, Melvin C] on *FREE* shipping on qualifying offers. High-temperature dielectric properties of candidate space-shuttle thermal-protection-system and antenna-window materials (NASA technical note)Author: Melvin C Gilreath.
A high temperature psychrometric chart (University of North Dakota. College of Engineering. Bulletin) [Irvin Lavine] on *FREE* shipping on qualifying : Irvin Lavine.
During the high temperature drying runs ( to °C) in this study, the EMCs were estimated to dip as low as 3 to 5% based on the extrapolated low-temperature EMC data to high temperatures (up to °F) established by Simpson and Rosen ().
Figure 2 Cross-section of a typical sawn timber; T = tangential shrinkage, R = radial shrinkage. Wood polymers are modified or re-organized by the exposure to high temperature ranges between and °C for different exposure periods under inert gas medium.
The main advantages of thermal modification are increased hydrophobicity, improved dimensional stability, lowered equilibrium moisture content, homogeneous color, better resistance Cited by: 3. The goal of this chapter is to advise shipowners about corrosion control on ships to extend service life with sound structure integrity.
A ship’s corrosion control includes steel materials, protective coatings, and cathodic protection, which should be considered in all stages of a ship’s : Chao Wei, George Wang, Marcus Cridland, David L.
Olson, Stephen Liu. FRP and FRP in concrete environment based on the acceleration of degradation rate using high temperature. But Robert et al. () stated regarding the use of high temperature as an accelerating factor that high temperature may amplify the reduction of the properties which may lead to conservative prediction of long-term properties.
2,+ construction related standards from all 13 volumes of Section 4 of the Annual Book of ASTM Standards. Subjects include cement, lime, gypsum, concrete and aggregates, road and paving materials, roofing waterproofing, bituminous materials, concret pipe, masonry, thermal insulation, environmental acoustis, building seals and sealants, fire standards, dimension.
PROPERTIES OF COMPOSITE MATERIALS FOR MODELING HIGH TEMPERATURE RESPONSE. Brian Y. Lattimer, Thomas W. Goodrich, Jillian Chodak, and Christopher Cain. Virginia Tech. Department of Mechanical Engineering.
Randolph Hall (MC ) Blacksburg, VA ABSTRACT. Methods are provided for obtaining composite material high temperature File Size: KB. ASTM Building Codes / Construction Combo Collection Edition: VAR $7, Unlimited Users - 1 Loc per C Standard Test Method for Linear Shrinkage of Preformed High-Temperature Thermal Insulation Subjected to Soaking Heat.
D Standard Test Methods for Evaluating Properties of Wood-Base Fiber and Particle Panel Materials. As with compression wood, longitudinal shrinkage in tension wood is both irregular and greater than normal, resulting in warping and machining problems.
F i g u r e • The a b n o r m a l fibers of tension w o o d can leave a w o o l l y surface, as on this c o t t o n w o o d board w h e n it was sawn f r o m t h e log.
Butterworth-Heinemann is an imprint of Elsevier Linacre House, Jordan Hill, Oxford, OX2 8DP 30 Corporate Drive, Burlington, MA First published Second edition. TiC in a molybdenum and nickel matrix is formulated for high-temperature service.
Tensile and compressive strengths, hardness, and oxidation resistance are as high as °C. Critical parts for welding and thermal metalworking tools, valves, seals, and high-temperature gauging equipment are made from grades of this RHM.
Abstract Wettability is a key parameter that affects the petrophysical properties of reservoir rocks. The objective of the present work is to investigate the influence of temperature and pressure on the wettability of reservoir rocks.
An experimenta. High-Temperature Corrosion Environments The Oxidation Resistance of Low-alloy Steels High-temperature Corrosion of Cast Iron vii viii CONTENTS High-alloy Steels Nickel and its Alloys Thermodynamics and Kinetics of Gas-Metal Systems 8.
Effect of Mechanical Factors on Corrosion Mechanisms of Stress-corrosion. The very first paper on self-propagating high-temperature synthesis can be seen here (This document in MS Word97 format, zip-compressed, Kb). The discovery was made during a search for a model of the so-called gasless combustion (iron–aluminum thermite with alumina added as ballast).The heat flow is therefore negative, according to sign convention.
Then, according to Equation (), the system entropy change will also be negative; that is, the system entropy will decrease. The associated heat flow, however, is into the environment, hence positive with respect to the environment (considered as a system).conducted in a high-temperature linear cascade rig for a range of tip clearances (%, %, % and 1%).
Surface temperature history was captured by Infrared Thermography at a range of wall-to-gas TRs. Heat Transfer Coefficient (HTC) distributions were obtained based on a conventional data processing technique.
The profound influence of tip.