# bending stress

## Solution to Problem 510 | Flexure Formula

## Solution to Problem 509 | Flexure Formula

**Problem 509**

A section used in aircraft is constructed of tubes connected by thin webs as shown in Fig. P-509. Each tube has a cross-sectional area of 0.20 in^{2}. If the average stress in the tubes is no to exceed 10 ksi, determine the total uniformly distributed load that can be supported in a simple span 12 ft long. Neglect the effect of the webs.

## Solution to Problem 508 | Flexure Formula

**Problem 508**

Determine the minimum height h of the beam shown in Fig. P-508 if the flexural stress is not to exceed 20 MPa.

## Solution to Problem 507 | Flexure Formula

**Problem 507**

In a laboratory test of a beam loaded by end couples, the fibers at layer AB in Fig. P-507 are found to increase 60 × 10^{-3} mm whereas those at CD decrease 100 × 10^{-3} mm in the 200-mm-gage length. Using E = 70 GPa, determine the flexural stress in the top and bottom fibers.

## Solution to Problem 506 | Flexure Formula

**Problem 506**

A flat steel bar, 1 inch wide by ¼ inch thick and 40 inches long, is bent by couples applied at the ends so that the midpoint deflection is 1.0 inch. Compute the stress in the bar and the magnitude of the couples. Use E = 29 × 10^{6} psi.

## Solution to Problem 505 | Flexure Formula

**Problem 505**

A high strength steel band saw, 20 mm wide by 0.80 mm thick, runs over pulleys 600 mm in diameter. What maximum flexural stress is developed? What minimum diameter pulleys can be used without exceeding a flexural stress of 400 MPa? Assume E = 200 GPa.

## Solution to Problem 504 | Flexure Formula

**Problem 504**

A simply supported beam, 2 in wide by 4 in high and 12 ft long is subjected to a concentrated load of 2000 lb at a point 3 ft from one of the supports. Determine the maximum fiber stress and the stress in a fiber located 0.5 in from the top of the beam at midspan.

## Solution to Problem 503 | Flexure Formula

**Problem 503**

A cantilever beam, 50 mm wide by 150 mm high and 6 m long, carries a load that varies uniformly from zero at the free end to 1000 N/m at the wall. (a) Compute the magnitude and location of the maximum flexural stress. (b) Determine the type and magnitude of the stress in a fiber 20 mm from the top of the beam at a section 2 m from the free end.

## Flexure Formula

**Flexure Formula**

Stresses caused by the bending moment are known as flexural or bending stresses. Consider a beam to be loaded as shown.

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