# stress: Stress Box In geophys: Geophysics, Continuum Mechanics, Gravity Modeling

## Description

Display interactive Stress Box illustrating normal and shear stress on an arbitrary plane given a stress tensor.

## Usage

 ```1 2``` ```stress(PPs = matrix(ncol = 4, nrow = 3), Rview = c(-130, -50), xscale = 100, Stensor = matrix(ncol = 3, nrow = 3)) ```

## Arguments

 `PPs` 3Points in 3 by 4 matrix `Rview` Viewing matrix `xscale` arbitrary scale `Stensor` stress tensor

## Details

Interactive program to examine stress. To change the plane orientation, click on one of the points and then on a new position along the axis selected.

If a stress tensor is provided, then a second graphics device is required to show the Mohr's circle.

## Value

Graphical Side effects

## Note

Uses RPMG for interaction.

## Author(s)

Jonathan M. Lees<jonathan.lees@unc.edu>

 ``` 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27``` ```## Not run: ##### no stress tensor provided => no mohr's circle stress() ######################### run program with a stress tensor Stensor = matrix(c( 15, 0, 0, 0, 10, 0, 0, 0, 5), ncol=3) stress(Stensor=Stensor) P1 = c(0.2, 1, 1, 0) P2 = c(1, 0.1, 1, 0) P3 = c(1, 1, 0.4, 0) S = stressSETUP(P1, P2, P3, xscale=30 ) stress(PPs = S\$PPs, Rview =S\$Rview, xscale = S\$xscale, Stensor=Stensor ) ## End(Not run) ```