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Related Concept Videos

Design Consideration01:22

Design Consideration

461
Designing a structure involves a series of considerations, primarily the material's ultimate strength, calculated through tests that measure changes under increased force until the material reaches its breaking point or limit. The ultimate load, where the material breaks, is divided by its original cross-sectional area, resulting in the ultimate normal stress or strength. The ultimate shearing stress is another significant factor taken into account.
The factor of safety is another key...
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Statically Indeterminate Problem Solving01:16

Statically Indeterminate Problem Solving

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Statically indeterminate problems are those where statics alone can not determine the internal forces or reactions. Consider a structure comprising two cylindrical rods made of steel and brass. These rods are joined at point B and restrained by rigid supports at points A and C. Now, the reactions at points A and C and the deflection at point B are to be determined. This rod structure is classified as statically indeterminate as the structure has more supports than are necessary for maintaining...
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Applications of Stress01:04

Applications of Stress

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Consider a structure made of a boom and a rod designed to support a load. These two components are connected by a pin and stabilized by brackets and pins. The boom and the rod are detached from their supports to assess the different stresses imposed on this structure, and a free-body diagram is drawn. Then, all the forces applied, including the load acting on the structure, are identified. The reaction forces exerted on both the boom and the rod are computed using the equilibrium equations.
The...
533
Design of Transmission Shafts - Stress Analysis01:15

Design of Transmission Shafts - Stress Analysis

644
Designing a transmission shaft requires a thorough understanding of the stresses induced by bending moments and torques, especially in systems where power is transferred through gears. These forces create force-couple systems at the centers of the shaft's cross-sections, leading to both transverse and torsional loading. Although shearing stresses from transverse loads are typically smaller than those from torques and are often overlooked, the significant normal stresses from these loads...
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Shear and Bending Moment Diagram: Problem Solving01:24

Shear and Bending Moment Diagram: Problem Solving

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When analyzing a beam supporting concentrated loads and a distributed load, drawing the shear and bending moment diagrams is essential. These diagrams help understand the internal forces and moments acting on the beam, which is crucial for designing safe and efficient structures. Follow these steps to create the shear and bending moment diagrams:
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Internal Loadings in Structural Members: Problem Solving01:28

Internal Loadings in Structural Members: Problem Solving

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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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Developing and evaluating a finite element model for predicting the two-posts rollover protective structure nonlinear

Farzaneh Khorsandi1, Paul D Ayers1, Timothy J Truster2

  • 1Department of Biosystems Engineering and Soil Science, University of Tennessee, Knoxville, TN, USA.

Biosystems Engineering
|July 28, 2020
PubMed
Summary
This summary is machine-generated.

This study validates nonlinear finite element (FE) models for predicting Rollover Protective Structures (ROPS) performance under static tests. The FE models accurately predicted ROPS force-deflection curves, crucial for ensuring operator safety.

Keywords:
Finite element analysisROPSStandard testVirtual test

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Area of Science:

  • Agricultural Engineering
  • Mechanical Engineering
  • Computational Mechanics

Background:

  • Rollover Protective Structures (ROPS) are critical safety devices for tractor operators.
  • Standardized static tests (SAE J2194) evaluate ROPS energy absorption and deformation resistance.
  • Accurate prediction of ROPS performance is essential for design and safety validation.

Purpose of the Study:

  • To apply nonlinear finite element (FE) techniques to predict ROPS force-deflection curves.
  • To validate FE models against experimental data for specific tractor ROPS models.
  • To compare the accuracy of different material modeling approaches in FE analysis.

Main Methods:

  • Simulation of SAE J2194 static tests using nonlinear FE analysis.
  • Modeling of two rear-mount two-post ROPS for Allis Chalmers 5040 and Long 460 tractors.
  • Development and validation of FE models using experimental stress-strain data and comparing with Ramberg-Osgood models.

Main Results:

  • The recommended FE model (ASTM, C3D10M, 0.01) predicted ROPS performance deflection (RPD) with less than 10% average error.
  • FE models showed higher accuracy in predicting ROPS behavior under rear load conditions compared to side loads.
  • FE models based on measured stress-strain curves outperformed those using the Ramberg-Osgood material model.

Conclusions:

  • Nonlinear FE analysis is a viable tool for predicting ROPS force-deflection characteristics.
  • FE models incorporating experimentally derived material properties offer superior accuracy for ROPS performance prediction.
  • The study provides a validated approach for optimizing ROPS design and ensuring operator safety.