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Figure 2: Weight (W), the frictional force (F r), and the normal force (F n) acting on a block.Weight is the product of mass (m) and the acceleration of gravity (g).In the case of an object resting upon a flat table (unlike on an incline as in Figures 1 and 2), the normal force on the object is equal but in opposite direction to the gravitational force applied on the object (or the weight of ...
In mechanics, strain is defined as relative deformation, compared to a reference position configuration. Different equivalent choices may be made for the expression of a strain field depending on whether it is defined with respect to the initial or the final configuration of the body and on whether the metric tensor or its dual is considered.
An alternative definition of the plasticity index has been given by Mikic. [32] Yield occurs when the pressure is greater than the uniaxial yield stress. Since the yield stress is proportional to the indentation hardness σ 0 {\displaystyle \sigma _{0}} , Mikic defined the plasticity index for elastic-plastic contact to be
The Weissenberg number (Wi) is a dimensionless number used in the study of viscoelastic flows. It is named after Karl Weissenberg.The dimensionless number compares the elastic forces to the viscous forces.
The definition of strain rate was first introduced in 1867 by American metallurgist Jade LeCocq, who defined it as "the rate at which strain occurs. It is the time rate of change of strain." In physics the strain rate is generally defined as the derivative of the strain with respect to time. Its precise definition depends on how strain is measured.
Bob Stoup and Juli Hall, both 86, fell in love when they were in high school, but they simply couldn't make things work. Luckily, fate brought them back together 60 years later. Julie explains ...
The strain hardening exponent (also called the strain hardening index), usually denoted , is a measured parameter that quantifies the ability of a material to become stronger due to strain hardening. Strain hardening (work hardening) is the process by which a material's load-bearing capacity increases during plastic (permanent) strain , or ...
Her high school sweetheart became one of the world's biggest heartthrobs. "It was so fun seeing him. When he saw me, I got a 'Lindseyyyyy' in his deep rumbly voice and a huge hug!" Aaron recalled.