quammstah
Mechanical
- Dec 15, 2017
- 2
Hello All,
I'm having a minor issue with Mathcad, and I was just using my resources to see if anyone could help me out.
Essentially, I'm generating shear and moment diagrams with the help of step functions, using a singularity function type approach. I can make those functions easy enough, and plot those shear and moment diagrams easily, as well as finding stresses at a point along the x axis.
However, when I attempt to the shear stress equation into a plot-able format, I get errors, and am unable to do so, using the proper tau sign. I would like to be able to do this, so in the future, when I have stresses along changing areas, I can see the greatest stresses with regards to area changes.
The funny thing is that I am able to plot these by just using V(x)/A(x). When I do this outside the plot, I receive the large matrix with all the function values at every point, and as I stated before I can plot those. The only thing is it's not very clean or concise, and I would rather be able to use the tau symbol. But when I set τ=V(x)/A(x) I get an error, and am unable to. Does anyone know how to fix this? In the same regard, I'd rather be able to put σ instead of "MC/I" for my formal reports.
Basically I set my constants such as total length, length to a point load, length to a distributed load, etc.
then:
A(x)=2m^2 (for here I set this, so I can figure out if everything's working before I attempt it on variable areas)
x:=0m, 0.005*L, L <------ Sets my "x" lengths
S(x,z):=if(x≥z,1,0) <------ Sets my step functions
V(x):=R1*S(x,0 m)- w*S(x,a)(x-a)+R2*S(x-b)-F*S(x-a) <-------Essentially is my singularity function for the beam
If I do: V(x)/A(x)= I receive a matrix
If I do: τ:=V(x)/A(x) I receive the error "the variable [x for the shear] is undefined."
Thank you for your help!
I'm having a minor issue with Mathcad, and I was just using my resources to see if anyone could help me out.
Essentially, I'm generating shear and moment diagrams with the help of step functions, using a singularity function type approach. I can make those functions easy enough, and plot those shear and moment diagrams easily, as well as finding stresses at a point along the x axis.
However, when I attempt to the shear stress equation into a plot-able format, I get errors, and am unable to do so, using the proper tau sign. I would like to be able to do this, so in the future, when I have stresses along changing areas, I can see the greatest stresses with regards to area changes.
The funny thing is that I am able to plot these by just using V(x)/A(x). When I do this outside the plot, I receive the large matrix with all the function values at every point, and as I stated before I can plot those. The only thing is it's not very clean or concise, and I would rather be able to use the tau symbol. But when I set τ=V(x)/A(x) I get an error, and am unable to. Does anyone know how to fix this? In the same regard, I'd rather be able to put σ instead of "MC/I" for my formal reports.
Basically I set my constants such as total length, length to a point load, length to a distributed load, etc.
then:
A(x)=2m^2 (for here I set this, so I can figure out if everything's working before I attempt it on variable areas)
x:=0m, 0.005*L, L <------ Sets my "x" lengths
S(x,z):=if(x≥z,1,0) <------ Sets my step functions
V(x):=R1*S(x,0 m)- w*S(x,a)(x-a)+R2*S(x-b)-F*S(x-a) <-------Essentially is my singularity function for the beam
If I do: V(x)/A(x)= I receive a matrix
If I do: τ:=V(x)/A(x) I receive the error "the variable [x for the shear] is undefined."
Thank you for your help!
