A Computerized Test Setup for the Determination of the In-Plane and Out-of-Plane Shear Modulus in Orthotropic Specimens

1991 ◽  
pp. 149-155
Author(s):  
D. Van Hemelrijck ◽  
L. Schillemans ◽  
F. De Roey ◽  
I. Daerden ◽  
F. Boulpaep ◽  
...  
Keyword(s):  
Shear Modulus ◽  
Plane Shear ◽  
Test Setup ◽  
Out Of Plane

scholarly journals Comparison of Theoretical and Laboratory Out-of-Plane Shear Stiffness Values of Cross Laminated Timber Panels

Buildings ◽  
2018 ◽  
Vol 8 (10) ◽  
pp. 146 ◽  
Author(s):  
Jan Niederwestberg ◽  
Jianhui Zhou ◽  
Ying-Hei Chui
Keyword(s):  
Shear Modulus ◽  
Cross Section ◽  
Single Layer ◽  
Beam Theory ◽  
Shear Stiffness ◽  
Plane Shear ◽  
Shear Moduli ◽  
Cross Laminated Timber ◽  
Highly Sensitive ◽  
Out Of Plane

The lay-up of cross laminated timber (CLT) leads to significant differences in properties over its cross-section. Particularly the out-of-plane shear behavior of CLT is affected by the changes in shear moduli over the cross-section. Results from laboratory shear tests are used to evaluate the shear stiffness of 3- and 5-layer CLT panels in their major and minor strength direction. The results are compared to calculated shear stiffness values on evaluated single-layer properties as well as commonly used property ratios using the Timoshenko beam theory and the shear analogy method. Differences between the two calculation approaches are pointed out. The shear stiffness is highly sensitive to the ratio of the shear modulus parallel to the grain to the shear modulus perpendicular to the grain. The stiffness values determined from two test measurements are compared with the calculated results. The level of agreement is dependent on the number of layers in CLT and the property axis of the CLT panels.

Identification of the Out-of-Plane Shear Modulus of a 3D Woven Composite

2012 ◽  
Vol 53 (5) ◽  
pp. 719-730 ◽  
Author(s):  
R. Gras ◽  
H. Leclerc ◽  
S. Roux ◽  
S. Otin ◽  
J. Schneider ◽  
...  
Keyword(s):  
Shear Modulus ◽  
Woven Composite ◽  
Plane Shear ◽  
Out Of Plane

scholarly journals Violin varnish induced changes in the vibro-mechanical properties of spruce and maple wood

Holzforschung ◽  
2020 ◽  
Vol 74 (8) ◽  
pp. 765-776 ◽  
Author(s):  
Sarah Louise Lämmlein ◽  
Bart Van Damme ◽  
David Mannes ◽  
Francis Willis Matthew Robert Schwarze ◽  
Ingo Burgert
Keyword(s):  
Shear Modulus ◽  
Mode Shapes ◽  
Rectangular Plates ◽  
Layered Systems ◽  
Plane Shear ◽  
Modal Damping ◽  
Determination Process ◽  
Out Of Plane ◽  
Induced Changes ◽  
Contact Free

AbstractViolin varnishes are known to alter the longitudinal and radial material properties of violin tonewood. Here, the varnish-induced changes in the vibrational and elastic properties of spruce and maple wood were studied by modal analysis of rectangular plates. This contact-free investigation yields the eigenfrequencies and corresponding mode shapes and modal damping ratios of multiple out-of-plane modes. The longitudinal and radial E-modulus and the in-plane shear modulus were determined by an inverse material property determination process. The influence of traditional European varnish materials and different coating build-ups, comprising alcohol-based as well as oil-based varnishes, was studied during their application and for several months during drying and aging of the multi-layered systems. The evolutions of the changes induced by the different varnishes were rather similar and, except for modal damping, less pronounced for maple than for spruce. For the latter, the longitudinal E-modulus was slightly decreased while the shear modulus and radial E-modulus were increased after 18 months. The strong increases in modal damping ratios shortly after applying the coating systems (up to 150%) were reduced over time but remained significant for the time-span studied. However, also small differences between the influence of different coating systems and varnish materials on the amplitude of the induced changes became apparent.

scholarly journals Comparison of Theoretical and Laboratory Out-of-Plane Shear Stiffness Values of Cross Laminated Timber Panels

2018 ◽  
Author(s):  
Jan Niederwestberg ◽  
Jianhui Zhou ◽  
Ying-Hei Chui
Keyword(s):  
Shear Modulus ◽  
Cross Section ◽  
Single Layer ◽  
Beam Theory ◽  
Shear Stiffness ◽  
Plane Shear ◽  
Shear Moduli ◽  
Cross Laminated Timber ◽  
Highly Sensitive ◽  
Out Of Plane

The lay-up of cross laminated timber (CLT) leads to significant differences in properties over its cross-section. Particularly the out-of-plane shear behavior of CLT is effected by the changes in shear moduli over the cross-section. Results from laboratory shear tests are used to evaluate the shear stiffness of 3- and 5-layer CLT panels in their major and minor strength direction. The results are compared to calculated shear stiffness values on evaluated single-layer properties as well as commonly used property ratios using the Timoshenko beam theory and the shear analogy method. Differences between the two calculation approaches are pointed out. The shear stiffness is highly sensitive to the ratio of the shear modulus parallel to the grain to the shear modulus perpendicular to the grain. The stiffness values determined from two test measurements are compared with the calculated results. The level of agreement is dependent on the number of layers in CLT and the property axis of the CLT panels.

scholarly journals A Review of the Methods for Predicting the Effective In-Plane Shear Modulus of Cross-Laminated Timber (CLT)

2021 ◽  
Vol 2021 ◽  
pp. 1-15
Author(s):  
Mehsam Tanzim Khan ◽  
Ying Hei Chui ◽  
Dongsheng Huang
Keyword(s):  
Shear Modulus ◽  
Structural Members ◽  
Current Standard ◽  
Load Bearing Capacity ◽  
Plane Shear ◽  
Cross Laminated Timber ◽  
High Rise ◽  
Out Of Plane ◽  
Alternative Material ◽  
Almost All

Cross-laminated timber (CLT) is a type of engineered wood product that offers both high in-plane and out-of-plane load-bearing capacity. It is slowly becoming an alternative material for building high-rise structures. However, there is no current standard or regulation for determining the shear modulus of CLT under in-plane loading condition, which is a very important property for its use as structural members. Few methods have been proposed over the last decade to determine the in-plane shear modulus of CLT. Almost all of the methods proposed until now have their strengths and weaknesses. In this paper, some of the prominent methods for determining the in-plane shear modulus of CLT are described and analysed. The descriptions along with the critical discussions will facilitate a better understanding and might pave the way to further enhancements of the method(s) to determine the in-plane shear modulus of CLT.

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