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Related Concept Videos

Distributed Loads01:19

Distributed Loads

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Distributed loads are a common type of load that engineers and scientists encounter in various practical situations. Distributed loads often refer to a type of load spread over a surface or a structure and can be modeled as continuous force per unit area.
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When a rod is made of different materials or has various cross-sections, it must be divided into parts that meet the necessary conditions for determining the deformation. These parts are each characterized by their internal force, cross-sectional area, length, and modulus of elasticity. These parameters are then used to compute the deformation of the entire rod.
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Impact Loading01:19

Impact Loading

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Impact loading occurs when a moving object collides with a stationary structure, such as a rod with a uniform cross-sectional area fixed at one end. Under these conditions, the rod absorbs the kinetic energy from the striking object, leading to deformation and subsequent stress development. As the rod returns to its original position and reaches maximum stress, the absorbed energy, initially manifested as kinetic energy, transforms entirely into strain energy.
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Internal Loadings in Structural Members: Problem Solving01:28

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When designing or analyzing a structural member, it is important to consider the internal loadings developed within the member. These internal loadings include normal force, shear force, and bending moment. Engineers can ensure that the structural member can support the applied external forces by calculating these internal loadings.
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Unsymmetric Loading of Thin-Walled Members01:23

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Thin-walled members with non-symmetrical cross-sections are vital to engineering structures, offering material efficiency and structural integrity. However, unsymmetrical loading on these members leads to complex stress distributions, resulting in simultaneous bending and twisting can cause deformation or structural failure. The interaction between bending and twisting requires detailed analysis to ensure structural resilience.
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Distributed Loads: Problem Solving01:21

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Beams are structural elements commonly employed in engineering applications requiring different load-carrying capacities. The first step in analyzing a beam under a distributed load is to simplify the problem by dividing the load into smaller regions, which allows one to consider each region separately and calculate the magnitude of the equivalent resultant load acting on each portion of the beam. The magnitude of the equivalent resultant load for each region can be determined by calculating...
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Distributed loads alter internal load predictions in the hands and forearm.

Ryan Chhiba1, Daanish M Mulla1,2, Peter J Keir1

  • 1Department of Kinesiology, McMaster University, Hamilton, Ontario, Canada.

Computer Methods in Biomechanics and Biomedical Engineering
|April 20, 2026
PubMed
Summary
This summary is machine-generated.

This study shows how external hand forces affect joint moments and muscle activation. Distributed force models (center of mass and center of pressure) yield lower moments and activation than single point models, improving hand model biofidelity.

Keywords:
Pressure mappingbiomechanical modelingjoint momentsmuscle activity

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Area of Science:

  • Biomechanics
  • Human-Computer Interaction
  • Robotics

Background:

  • Accurate modeling of hand forces is crucial for understanding human movement and designing effective robotic interfaces.
  • Previous models often simplified external force application, potentially limiting biofidelity.

Purpose of the Study:

  • To investigate the influence of distributed external hand forces on joint moments and muscle activation.
  • To compare the biomechanical outputs of different external force input models in OpenSim.

Main Methods:

  • Collected kinematic and force data during multi-finger tasks.
  • Measured surface pressure to develop three force input models in OpenSim: center of mass (CM), center of pressure (CP), and single point force (SP).

Main Results:

  • Center of mass (CM) and center of pressure (CP) models produced equivalent joint moments and muscle activations.
  • Distributed loading (CM and CP) resulted in significantly lower moments and muscle activation compared to the single point force (SP) model.
  • Internal loads were sensitive to the distribution of external forces.

Conclusions:

  • The distribution of external forces significantly impacts internal loads, joint moments, and muscle activation.
  • Distributed force models (CM and CP) offer improved biofidelity in hand modeling compared to simplified single point force models.
  • Complex external force inputs enhance the accuracy of hand biomechanical models.