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Strain theory is a sociological and criminological theory developed in 1939 by Robert K. Merton. [1] The theory states that society puts pressure on individuals to achieve socially accepted goals (such as the American Dream), even though they lack the means to do so.
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.
Agnew recognized that strain theory, originally put forward by Robert King Merton, was limited in terms of fully conceptualizing the range of possible sources of strain in society, especially among youth. According to Merton, innovation occurs when society emphasizes socially desirable and approved goals but at the same time provides inadequate ...
Compatibility conditions are mathematical conditions that determine whether a particular deformation will leave a body in a compatible state. [2] In the context of infinitesimal strain theory, these conditions are equivalent to stating that the displacements in a body can be obtained by integrating the strains.
Robert Merton’s Strain Theory dictates that deviance in lower economic classes oftentimes is characterized by retreatism deviance. [13] Merton claims that homelessness and addiction in lower classes is a result of individuals rebelling against both work and the desire for economic progress.
The external body forces appear as the independent ("right-hand side") term in the differential equations, while the concentrated forces appear as boundary conditions. The basic stress analysis problem is therefore a boundary-value problem. Stress analysis for elastic structures is based on the theory of elasticity and infinitesimal strain theory.
Strain theory can refer to; In chemistry: Baeyer strain theory; In social sciences: Strain theory (sociology), the theory that social structures within society may pressure citizens to commit crime; Value-added theory, the assumption that certain conditions are needed for the development of a social movement
The concept of strain is used to evaluate how much a given displacement differs locally from a rigid body displacement. [1] [8] [9] One of such strains for large deformations is the Lagrangian finite strain tensor, also called the Green-Lagrangian strain tensor or Green–St-Venant strain tensor, defined as