RILEM Draft Recommendation ‘Determination of the modulus of elasticity of prestressing steel strands’

The difficulties inherent in the direct determination of loads on off-shore structures which are exposed simultaneously to wind and waves make it desirable to model each situation in the laboratory It is shown here that scaling of the loads and the waves is possible by using waves which are generated by blowing air over the surface of a laboratory channel, and by choosing a model material with an appropriate modulus of elasticity Wind-generated waves such as those measured m the wind water tunnel of Colorado State University have a dimensionless spectrum (Hidy and Plate (1965)) that is identical in shape to that found off the coast of Florida under hurricane conditions (Collins (1966)) Furthermore, it has been shown that hydro-elastic modeling is quite feasible (LeMehaute (1966)) These two results are combined to give modeling criteria for off-shore structures if direct wind forces are disregarded.

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The Determination of Young's Modulus of Elasticity and Density in Iron-Cobalt and Iron-Nickel Alloys

Journal of the Japan Institute of Metals and Materials ◽

10.2320/jinstmet1937.6.8_401 ◽

1942 ◽

Vol 6 (8) ◽

pp. 401-404

Author(s):

Mikio Yamamoto

Keyword(s):

Young’S Modulus ◽

Modulus Of Elasticity ◽

Nickel Alloys ◽

Young's Modulus ◽

Iron Cobalt ◽

Young’S Modulus Of Elasticity ◽

Iron Nickel ◽

Iron Nickel Alloys

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Pre-grading of spruce logs containing frozen and unfrozen water by means of frequency-based nondestructive testing (NDT)

Holzforschung ◽

10.1515/hf-2014-0016 ◽

2016 ◽

Vol 70 (1) ◽

pp. 79-85 ◽

Cited By ~ 5

Author(s):

Julia K. Denzler ◽

Andreas Weidenhiller

Keyword(s):

Nondestructive Testing ◽

Moisture Content ◽

Industrial Application ◽

Modulus Of Elasticity ◽

Dynamic Modulus ◽

The State ◽

Temperature Measurements ◽

Unfrozen Water ◽

State Of Matter

AbstractThe possibility for pre-grading of logs throughout the year has been evaluated based on dynamic modulus of elasticity (MOEdynor simplifiedEdyn) by means of frequency-based nondestructive testing (NDTfreq). The challenge is thatEdynis variable in the frozen, partly frozen, and unfrozen states of logs (state of matter). In the unfrozen state, NDTfreqis reliable if the moisture content does not fall below fiber saturation. The state of the matter was tested via temperature measurements of air and log by means of an infrared technique and sensors, and information was evaluated from NDTfreq. The temperature measurements proved to be inefficient for industrial application because of unreliable data and long measurement times, whereas the NDTfreqmeasurements allowed the determination of meaningful damping factors. A sufficient level of predictability for more than 60% of the measurements was found. The log measurements in the partly frozen state are inconclusive becauseEdyndata fluctuate in the presence of both liquid and frozen water. For the completely frozen logs, a correction is introduced as a precaution that avoids an overestimation ofEdynin the unfrozen state.

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