Double Integral trouble (MathCAD program freezing)

[Mattman]

I have been trying to solve an indefinite integral using MathCAD 14.0 and freezing the program. I am trying to take the integral and double integral of moment-curvature equations in the form of Ax/(B+Cx+Dx²+Ex³+Fx⁴). Is a different program popular with any of the members for this type of problem? If I had the general solution, I could work out the A,B,C,D,E, and F values for each beam separately. Thanks in advance for any help!

 

[Deleted member 4993]

I have been trying to solve an indefinite integral using MathCAD 14.0 and freezing the program. I am trying to take the integral and double integral of moment-curvature equations in the form of Ax/(B+Cx+Dx²+Ex³+Fx⁴). Is a different program popular with any of the members for this type of problem? If I had the general solution, I could work out the A,B,C,D,E, and F values for each beam separately. Thanks in advance for any help!

Did you try partial fraction?

What are your thoughts?

Please share your work with us ...even if you know it is wrong

If you are stuck at the beginning tell us and we'll start with the definitions.

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[Mattman]

Thanks, splitting it up into partial fractions is a good idea. Ultimately this needs to be a program, but the partial fractions would certainly make it easier for the software to run.

 

[Deleted member 4993]

I have been trying to solve an indefinite integral using MathCAD 14.0 and freezing the program. I am trying to take the integral and double integral of moment-curvature equations in the form of Ax/(B+Cx+Dx²+Ex³+Fx⁴). Is a different program popular with any of the members for this type of problem? If I had the general solution, I could work out the A,B,C,D,E, and F values for each beam separately. Thanks in advance for any help!

B+Cx+Dx²+Ex³+Fx⁴ = F(x⁴ + E₁x³ + D₁x² + C₁x + B₁) = F (x -x₁)(x - x₂)(x - x₃)(x - x₄)

Now equate the coefficients of the same exponents of x and solve for x₁, x₂, x₃ and x₄.

Depending on the magnitudes and signs of B, C, D, E and F, you may get some of those roots (x_i) to be imaginary.