External Restraint
External Restraint - Related Videos
01:28
Pig Handling and Restraint
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2026
All animal procedures described here must be conducted in accordance with institutional animal ethics guidelines and approved by IACUC. All procedures must follow the principles of the 3Rs—Replacement, Reduction, and Refinement—and must be performed by trained personnel. Acclimation and Positive Reinforcement Training Pigs are social animals that respond best to calm, low-stress handling techniques. Acclimation and positive reinforcement training are important refinement strategies recommended...
15:57
Rodent Handling and Restraint Techniques
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2015
Source: Kay Stewart, RVT, RLATG, CMAR; Valerie A. Schroeder, RVT, RLATG. University of Notre Dame, IN It has been demonstrated that even minimal handling of mice and rats is stressful to the animals. Handling for cage changing and other noninvasive procedures causes an increase in heart rate, blood pressure, and other physiological parameters, such as serum corticosterone levels. Fluctuations can continue for up to several hours. The methods of restraint required for injections and blood...
01:43
Rabbit Handling and Manual Restraint
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2026
All animal procedures described here must be conducted in accordance with institutional animal ethics guidelines and approved by IACUC. All procedures must follow the principles of the 3Rs—Replacement, Reduction, and Refinement—and must be performed by trained personnel. Rabbits possess powerful hindlimb musculature and are susceptible to spinal injury if they struggle or kick while inadequately supported. Because rabbits vary in temperament and may struggle during restraint, handlers should...
14:10
Manual Restraint and Common Compound Administration Routes in Mice and Rats
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Cited by 95 •
2012
Working safely and humanely with research rodents requires a core competency in handling and restraint methods. This article will present the basic principles required to safely handle and effectively administer compounds to mice and rats.
01:20
Externalities
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2025
Externalities are unintended side effects of economic activities that impact third parties who are not directly involved in the market transaction. They can have positive or negative effects that can influence society and the environment in various ways. Positive Externalities Positive externalities occur when a market activity produces benefits for others without those beneficiaries having to pay for it. Examples include: Education: When individuals receive an education, society benefits...
FAQs
Reaction forces are determined by combining the restraint conditions with equilibrium requirements. In a free-body diagram, engineers represent each connection or support according to the translation, rotation, or expansion it restricts, then solve for reactions consistent with the allowed movement. Those reactions reveal how the structure carries applied loads and support displacement assessment.
Prevented deformation is a central consequence of restraint. If a component would expand, contract, or shift under loading but the surrounding system limits that movement, the resulting incompatibility produces internal stress. Thermal loading is a particularly important case: a restraint that improves positional control can also raise stress and create damage risk if expansion is not accommodated.
The location and orientation of an external restraint influence more than whether motion is blocked. They affect load distribution, displacement patterns, and stress concentration within the structure. Engineers therefore examine placement when evaluating stability and failure risk, since a poorly positioned connection can transfer loads unevenly even when the overall structure appears adequately supported.
Analysis begins by identifying every connection, support, and surrounding constraint that can limit translation, rotation, or expansion. Engineers then represent those conditions in a free-body diagram, apply the relevant loads, and impose equilibrium. The resulting reactions and predicted movements are checked against intended behavior, with attention to localized stresses and possible failure conditions.
In a finite element model, external restraints are introduced as boundary conditions at selected locations or regions. The model uses those constraints to calculate displacement, load distribution, and internal stress behavior throughout the structure. Accurate placement matters because an overly restrictive or poorly located boundary condition can produce unrealistic reactions and obscure the failure risks being evaluated.
For bridges, frames, pipelines, and machines, restraints provide a way to transfer applied loads into supports or surrounding systems while maintaining the intended configuration. The analytical goal is not simply to prevent movement; it is to predict how restraint changes displacement and load paths. That information supports decisions about stability, structural performance, and damage prevention.