Sunday, July 14, 2013


By Julie Rahm
(Would you put your relationship in the hands of a division sign? :-) Okay. It's not a perfect subject match for the blog today...a fan sent it to me...may you smile as I did.) On to the blog...

When an elastic material is deformed due to an external force, it experiences internal forces that oppose the deformation and restore it to its original state if the external force is no longer applied.
The elasticity of material can be described on a stress-strain curve. This mathematical curve shows the relation between stress (restorative internal force) and strain (deformation). For most metals or crystalline materials, the curve is linear for small deformations.  However, for larger stresses beyond the elastic limit, the relation is no longer linear. For even higher stresses, some materials exhibit plastic behavior. That is, they deform irreversibly and do not return to their original shape after stress is no longer applied.
An elastic modulus, or modulus of elasticity, is the mathematical description of an object or substance's tendency to be deformed elastically (non-permanently) when a force is applied. The elastic modulus of an object is defined as the slope of its stress–strain curve in the elastic deformation region. Therefore, a stiffer material will have a higher elastic modulus.
Specifying how stress and strain are to be measured allows for many types of elastic moduli definitions. The three primary ones are Young’s modulus, the bulk modulus, and the shear modulus.
Young's modulus describes the tendency of an object to deform along an axis when opposing forces are applied along that axis. Young’s modulus is defined as the ratio of tensile stress to tensile strain.
Extending Young’s modulus to three dimensions gives you the bulk modulus. The bulk modulus describes volumetric elasticity, or the tendency of an object to deform in all directions when uniformly loaded in all directions. The bulk modulus is defined as volumetric stress over volumetric strain, and is the inverse of compressibility.
The shear modulus or modulus of rigidity describes an object's tendency to shear when acted upon by opposing forces. The shear modulus is defined as shear stress over shear strain. Interestingly, the shear modulus is part of the derivation of viscosity.
Are you still with me? Don’t turn the page! I have led you into the world of mechanical engineering to tell you relationships must be elastic in order to endure. There is stress in every relationship. When stress is applied to a relationship, the relationship deforms, as during arguments or separation. The elastic moduli of the relationship must be large enough to withstand sheering. Then, after the stress is removed, the relationship will not be deformed and return to its original condition.
One technique that I find most helpful to aid relationship elasticity is realizing that deformation is usually temporary. Babies grow up and take care of themselves. Teenagers move out. And, bosses get promoted or retire! As another example, most financial stresses are temporary and can be removed by using a brain-ful approach.  Identify the actual problem. Then, separate your thinking from the collective consciousness’ thoughts and fears.
So, I encourage you to think “elastics”. And then, visit me online at

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