Write a main function and the following functions to compute the stress and stra

Question

Write a main function and the following functions to compute the stress and strain in a steel rod of diameter D(inches) and length L (inches) subject to the compression loads P of 10,000 to 1,000,000 poundsin increments of 1000,000 pounds. The modulus of elasticity E for steel is 30 X 106.

- A function to commpute the stress from the formulas:

where A = D2 / 4.0

- A function to commpute the strain from the formulas:

- A function to output the stress and strain at different loads of P.

The function should call each other as shown in the structure chart

Explanation / Answer

So, I'm not sure what the increments were supposed to be, I'm assuming increments of 10000 but I declared it seperately on line 22 to make it easy to change.

I also wasn't sure how the program should take input for D and L, so I used cin.

Stress is called by print, as is strain, and print is called in main. If that structure isn't quite right it shouldn't be hard to pass a increment by reference and call them in main, but that really is poor code structure, Spagetti code, it's called.

To have a function "strain()" alter both "e" and "deltaL" I passed "deltaL" by reference to allow it to be changed in the function and returned strain. You might want to make stress and strain inline, to improve proformance, but it's a small enough program effeciency isn't really an issue.

#include<iostream> // for cout/cin
#include<iomanip> // for setprecision()


float stress(float weight, float diam)
{
    float pi = 3.1415926535897932384626;
    return ((weight*4.0)/(pi*diam*diam)); //f=p/pi*D*D/4.0
}

float strain(float stress, float len, float & deltaL)
{
    float modOfElasSteel = 30000000;

    deltaL = (stress*len/modOfElasSteel); // DeltaL = f*L1/E
   
    return (stress/modOfElasSteel); // e = f/E
}

void print(float diam, float len)
{
    int increment = 10000, lbound=10000, ubound=1000000;
    float deltaL = 0;
   
    std::cout << std::setprecision(2); // apply some structure to the table
    std::cout << "lbs applied:        stress:        strain:        deltaL:" << std::endl;
    for (int weight = lbound; weight <= ubound; weight += increment)
    {
        std::cout << weight << " lbs    |    " << stress(weight, diam) << " psi    |" << strain(stress(weight, diam), len, deltaL)
            << "    |    " << deltaL << " in" << std::endl;
    }
}

int main()
{
    float diam, len;
    std::cout << "I can calculate the stess, strain, and change in len of a steel rod." << std::endl;
    std::cout << "Diameter of the rod(in):";
    std::cin >> diam;
    std::cout << "Length of the rod(in):";
    std::cin >> len;

    print(diam, len);

    return 0;
}

Related Questions

Navigate

• Browse (All)
• Browse W
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.