Problem with integral

[ptc-4705295]

Hi,

I have problem with MathCAD Integral. The following are my equations and graph.

According to equation, if xx = 2.9m, the answer is 10kN-m. However, the result is 0.

If anyone know how to solve this issue, please help me to solve this problem.

Thank you.

[AlanStevens]

It's the step changes that the integration routine doesn't like. One workaround is to do the integration piecewise:

Alan

[ptc-4705295]

Thanks you very for your help Alan. My problem solve.

[wayne]

David,Allen is, as is normal, correct.
For more complicated functions, numerical integration with large vertical steps is difficult. You can study the problem by currpting the data a little to replace the vertical line transition with a sloping one. It introduces some error, but on the other hand assuming an infinite slope step is probably not correct either. Anyway for what its worth, see attached.