Girty, G. 2002. Strain Machine, A Macromedia Director 8.5 Application for Introducing the Concepts of Simple and Pure Shear. In: Bobyarchick, A. 2002. Visualisation, Teaching and Learning in Structural Geology. Journal of the Virtual Explorer, 9, 31-38.
Strain Machine
A Macromedia Director 8.5 Application for Introducing
the Concepts of Simple and Pure Shear

 
Figure 1. The four components of deformation.  Select an item and the click on the Play button.


Figure 2. To distort the crinoid column by plane strain pure shear click on the Distort button.  R and RÍ are two material lines that are shortened and lengthened during the distortion.


Figure 3. Select a type of strain and then click on the Play button.

 

 
Figure 4. To distort the crinoid column by plane strain simple shear click on the Distort button.  R and RÍ are two material lines that prior to progressive simple shear were perpendicular. Following distortion, the change in angle between R and RÍ is 24o.

Figure 5. A Flash 5 animation illustrating the key elements in the derivation of the transformation equation for two dimensional simple shear.  Select sequentially the items in the Show Geometrical Element drop-down list.  To see the equations for the geometrical elements identified in the resulting animation, select the item from the Show Equation For drop-down list.

Figure 6. A Flash 5 animation  illustrating the key elements in the derivation of the transformation equation for two dimensional pure shear. Select sequentially the items in the Show Geometrical Elements drop-down list.  To see the equations for the geometrical elements identified in the resulting animation, select the item from the Show Equation For drop-down list.

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