Wood Handbook, Wood as an Engineering Material

Table 5–5b. Mechanical properties of some woods imported into the United States other than Canadian imports (inch–pound)a Static ...

Chapter 5 Mechanical Properties of Wood Table 5–5b. Mechanical properties of some woods imported into the United States other th ...

Table 5–5b. Mechanical properties of some woods imported into the United States other than Canadian imports (inch–pound)a—con. S ...

reevaluated to reflect these changes, the appropriateness of the data should be reviewed when used for critical applica- tions s ...

properties presented in other tables are referenced in the selected bibliography at the end of this chapter. Common names of spe ...

associated with the knot. The influence of knots depends on their size, location, shape, and soundness; attendant local slope of ...

are exceptions, where knots may be objectionable only in that they cause nonuniform wear or nonuniform stress distri- butions at ...

design, from the way the wood was removed from the log, or because of grain irregularities that occurred while the tree was grow ...

to fiber direction, plotted against angle to the fiber direction q. The plot is for a range of values of Q/P and n. The term slo ...

that the spiral grain slope on the flat-grained surface of Figure 5–5D is 1 in 12 and the diagonal-grain slope is 1 in The comb ...

normal wood, intermediate stages of compression wood can be detected by transmitting light through thin cross sections; however, ...

to 0.9, 0.5 to 0.95, and 0.45 to 0.75, respectively. Changes in shear strength resulting from increases in juvenile wood content ...

maple trees are also a source of mineral streaks. The streaks are caused by oxidation and other chemical changes in the wood. Bi ...

increase while wood is dried to very low moisture con- tent levels, for most species some properties may reach a maximum value a ...

below 100 °C (212 °F), the immediate effect is essentially reversible; that is, the property will return to the value at the ori ...

have been used to adjust some lumber properties for the re- versible effects of temperature. Irreversible Effects In addition to ...

degradation (Green and others 2005). It should be noted that most in-service exposures at 66 °C (150 °F) or 82 °C (180 °F) would ...

Creep and Relaxation When initially loaded, a wood member deforms elastically. If the load is maintained, additional time-depend ...

exponential function of time to failure, as illustrated in Figure 5–22. This relationship is a composite of results of studies o ...

failure in about 106 cycles at 40 Hz, a temperature rise of 15 °C (27 °F) has been reported for parallel-to-grain compression fa ...