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Stress-strain relationship of common wire nails under reversed cyclic oloading
Nailed timber joints are known to play an important role in the performance of light timber frame structures under extreme loading conditions such as those caused by hurricanes and earthquakes. Numerical modeling of nailed joints response to these loading conditions requires knowledge of the load-displacement or stress-strain property of nails under reversed cyclic load. As part of an overall program of work to validate a finite element nailed joint model, a new test method was developed and a modified constitutive material model was adopted to characterize the through-zero cyclic stress-strain behaviour of nails of different diameters. Four nail diameters ranging from 2.78 to 4.08 mm were evaluated using the proposed cyclic test and the conventional monotonic tension test methods. It is noted that the new model provides an excellent representation of the cyclic response of the nails. A comparison with monotonic test data reveals that yield stress under cyclic loading is higher than the monotonic test response, but the ultimate strength appears unaffected. Under cyclic loading, Bauschinger and strain-softening effects are evident. Elastic moduli are similar for the four nails tested. Yield stress and strain reduce with increase in nail diameter. The area enclosed by a hysteresis loop increases with increasing nail size.
Stress-strain relationship of common wire nails under reversed cyclic oloading
Nailed timber joints are known to play an important role in the performance of light timber frame structures under extreme loading conditions such as those caused by hurricanes and earthquakes. Numerical modeling of nailed joints response to these loading conditions requires knowledge of the load-displacement or stress-strain property of nails under reversed cyclic load. As part of an overall program of work to validate a finite element nailed joint model, a new test method was developed and a modified constitutive material model was adopted to characterize the through-zero cyclic stress-strain behaviour of nails of different diameters. Four nail diameters ranging from 2.78 to 4.08 mm were evaluated using the proposed cyclic test and the conventional monotonic tension test methods. It is noted that the new model provides an excellent representation of the cyclic response of the nails. A comparison with monotonic test data reveals that yield stress under cyclic loading is higher than the monotonic test response, but the ultimate strength appears unaffected. Under cyclic loading, Bauschinger and strain-softening effects are evident. Elastic moduli are similar for the four nails tested. Yield stress and strain reduce with increase in nail diameter. The area enclosed by a hysteresis loop increases with increasing nail size.
Stress-strain relationship of common wire nails under reversed cyclic oloading
Spannungs-Dehnungsverhältnis von gewöhnlichen Drahtnägeln unter reversibler zyklischer Beanspruchung
Chui, Y.H. (author) / Ni, C. (author)
Journal of Testing and Evaluation ; 26 ; 420-425
1998
6 Seiten, 8 Bilder, 1 Tabelle, 25 Quellen
Article (Journal)
English
Bauingenieurwesen , Holz , Verbinden (Fügen) , mechanische Eigenschaft , Spannungs-Dehnungs-Diagramm , zyklische Belastung , Schwingbeanspruchung , dynamische Belastung , Zugfestigkeit , Bauschinger-Effekt , mechanische Hysterese , Elastizitätsmodul , Dehngrenze , Biegebeanspruchung , Finite-Elemente-Methode , statische Berechnung , mathematisches Modell , Baustahl , Dauerfestigkeit , Bruchlebensdauer , Nagel
Stress-Strain Relationship of Common Wire Nails Under Reversed Cyclic Loading
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