# Using tikz how to draw a wedge?

I'm working on to create illustrations for my class on Mechanics of Materials & Theory of Elasticity!

I am trying to create a wedge and put arrows on plane to show the stresses acting.

Appreciate the help.

CODE: I found the code for a cube! Don't know where to start!

• You may want to have a look to the tikz-mec library. Commented Sep 24, 2014 at 9:02
• Since not everyone here is a mechanical engineer, it would probably help to add a picture of what you want to achieve, and also an example of what you have tried so far. Commented Sep 24, 2014 at 9:04
• Show us the code you found. :) Commented Sep 24, 2014 at 10:45

No nice code, but something for you to start with. This code is just a rough write up (could need some more time) of the graphic you have supplied. It's not mathematically correct and is just a draw from point a to b-solution. There are other ways to do this much more precisely and more sophisticated.

If you want more control over the figure i suggest you make use of \coordinates and heavy use of the calc-library. You can find every information you need about this in the pgfmanual. There are also many examples that will help you getting together everything you need.

\documentclass[tikz, border=5mm]{standalone}
\usetikzlibrary{calc}
\begin{document}
\begin{tikzpicture}[>=latex, font=\scriptsize]
\newcommand{\y}{1.5}
\newcommand{\yy}{\y/2}

% triangles
\draw (0,0,0) -- (4,0,0) -- (0,2,0) -- cycle;
\draw (0,0,\y) -- (4,0,\y) -- (0,2,\y) -- cycle;

% connectors of triangles
\draw (0,0,0) -- (0,0,\y);
\draw (4,0,0) -- (4,0,\y);
\draw (0,2,0) -- (0,2,\y);

% arrows
\draw [dashed, ->] (0,1,\yy) -- (0,.5,\yy) node [below] {{$\tau_{xy}$}};
\draw [->] (0,.75,\yy) -- ++(-.5,0,0) node [left] {$\sigma_x$};

\draw [dashed, ->] (3,0,\yy) -- (1,0,\yy) node [below] {$\tau_{xy}$};
\draw [->] (2,0,\yy) -- (2,-.5,\yy) node [below] {$\sigma_y$};

\draw [->] ($(4,0,\yy)!.5!(0,2,\yy)$) -- ($(4,0,\yy)!.75!(0,2,\yy)$) node [above left] {$\tau_n$} ;
\draw [->] ($(4,0,\yy)!.5!(0,2,\yy)$) -- ++(63:1cm) node [above] {$\sigma_n$};
\draw [dotted] ($(4,0,\yy)!.5!(0,2,\yy)$) -- ++(1,0,0);

% theta angles
\draw ($(4,0,\yy)!.5!(0,2,\yy)$) +(.5,0,0) arc (0:63:.5cm) node [midway, below left=-.1cm] {$\theta$};
\draw (0,2,\y) +(-90:.5cm) arc (-90:-27:.5cm) node [midway, above left=-.1cm]     {$\theta$};

% t-label
\draw [dotted] (4,0,0) -- (4.5,-.25,0);
\draw [dotted] (4,0,\y) -- (4.5,-.25,\y);
\draw [<->] (4.25,-.12,0) -- (4.25,-.12,\y) node [midway, below right] {$t$};
\end{tikzpicture}
\end{document}


Rendered image: