Design Contents |

Preliminary Matters

Design Methodology

..brain storming

..evaluation matrix

..QFD

Statistical Considerations

..variability in materials

..variability in dimensions

..variability in loading

..preferred sizes

Tolerances

Design Factor

Introduction to Failure

Failure Theories

Application of von Mises

..criterion in 2 D

Stress Concentration

..and notch sensitivity

Failure Under Combined Loading

..combined bending and torsion

Failure Under Cyclic Loading

..fatigue

..fracture mechanics

Instability - Buckling

Concentrically Loaded Strut

..slender columns

..Euler formula

..effective length

..short and intermediate columns

Eccentrically Loaded Strut

.. theory

Shock Loading

..deflection

..stress

DESIGN FOR SHOCK LOAD - DEFLECTION AND STRESS GENERATED |

**2. Comparison Between Slowly and Suddenly Applied Load**

**3. Worked Example**

Assume a mass of 2kg travelling at 0.5 m/s hits the free end of a 3m long steel cantilever beam which has a cross section 50mm deep (in the direction that the load is travelling) by 60mm wide. Assume E for steel is 200GPa.

Determine the maximum dynamic deflection and stress and what the equivalent drop height is.

The maximum deflection = v (m L

To determine the equivalent drop height - use the equation of constant acceleration:

(0.5)^{2} = 2 x 9.81 x s

s = (0.5)^{2}/2 x 9.81 = 12.7mm

David J Grieve, 1st March 2005.

**Contact the Author:**

Please contact me for comments and / or corrections or to purchase the book, at: davejgrieve@aol.com