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Related Concept Videos

Design Consideration01:22

Design Consideration

639
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...
639
Unsymmetric Loading of Thin-Walled Members01:23

Unsymmetric Loading of Thin-Walled Members

493
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.
The concept of the shear center is crucial in countering the...
493
Design of Prismatic Beams for Bending01:23

Design of Prismatic Beams for Bending

677
The design of prismatic beams, structural elements with a uniform cross-section, focuses on ensuring safety and structural integrity under load. The design process begins by determining the allowable stress, either from material properties tables, or by dividing the material's ultimate strength by a safety factor. This safety factor is essential for accommodating uncertainties, and varies depending on the material—timber, steel, or concrete—with each having unique strength and...
677
Yield Criteria for Ductile Materials under Plane Stress01:25

Yield Criteria for Ductile Materials under Plane Stress

733
In designing structural elements and machine parts using ductile materials, it is crucial to ensure that these components withstand applied stresses without yielding. Yielding is initially determined through a tensile test, which evaluates the material's response to uniaxial stress. However, tensile stress is insufficient when components face biaxial or plane stress conditions This condition requires advanced criteria to predict failure.
The Maximum Shearing Stress Criterion, also known as...
733
Design Example: Distributing Reinforcements in Concrete Sections01:22

Design Example: Distributing Reinforcements in Concrete Sections

343
The topic explores the practical aspects of adjusting steel reinforcements within a concrete beam section to meet specific design requirements. When designing a reinforced concrete beam, it is essential to distribute the steel reinforcements properly to ensure structural integrity and efficiency. The example provided details a scenario where a beam requires a total steel cross-section of 4 square inches. The engineer identifies that the available steel bars have a nominal diameter of 1.693...
343
Plastic Deformations of Members with a Single Plane of Symmetry01:21

Plastic Deformations of Members with a Single Plane of Symmetry

453
When a structural member undergoes plastic deformation due to bending, it is crucial to understand the position of the neutral axis and the stress distribution. This member, characterized by a single plane of symmetry, exhibits a uniform stress distribution, with negative stress above the neutral axis and positive stress below. Notably, the neutral axis does not align with the centroid of the cross-section. This misalignment is typical in cases where the cross-section is not rectangular or...
453

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Structural Design and Manufacturing of a Cruiser Class Solar Vehicle
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Structural Design Strategies for Improved Small Overlap Crashworthiness Performance.

Becky C Mueller1, Andrew S Brethwaite1, David S Zuby1

  • 1Insurance Institute for Highway Safety.

Stapp Car Crash Journal
|July 21, 2015
PubMed
Summary
This summary is machine-generated.

Automakers redesigned vehicles to improve performance in the Insurance Institute for Highway Safety (IIHS) small overlap frontal crash test. Structural modifications reduced occupant intrusion but sometimes increased injury risk due to restraint system limitations.

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Area of Science:

  • Automotive Engineering
  • Crash Safety
  • Biomechanics

Background:

  • The Insurance Institute for Highway Safety (IIHS) introduced a 64 km/h small overlap frontal crash test in 2012.
  • Thirteen automakers have since redesigned vehicle models to enhance performance in this specific test.

Purpose of the Study:

  • To analyze vehicle modifications implemented to improve small overlap frontal crash test results.
  • To evaluate the impact of these structural changes on crash dummy response and vehicle restraint system effectiveness.

Main Methods:

  • Comparison of vehicle structural performance and occupant compartment intrusion before and after design modifications in eight models.
  • Analysis of crash test data from 36 redesigned models to correlate design strategies with structural performance.
  • Examination of vehicle kinematics, dummy movement, and restraint system behavior in response to design changes.

Main Results:

  • Occupant compartment intrusion reductions varied from 6 cm to 45 cm, with more extensive modifications yielding greater reductions.
  • Strategies included occupant compartment reinforcement, energy-absorbing fender structures, and engagement structures.
  • Designs incorporating engagement structures showed better barrier glance-off and lower delta-V but increased dummy lateral motion.
  • Heavy occupant compartment reinforcement led to higher vehicle accelerations and delta-V.
  • In some cases, restraint systems did not adequately compensate for structural changes, potentially increasing injury risk.

Conclusions:

  • Various combinations of structural modifications effectively reduce occupant compartment intrusion and improve dummy kinematics in the IIHS small overlap test.
  • These improvements were achieved with only modest increases in vehicle weight.
  • The effectiveness of design strategies depends on their integration with restraint system performance to manage trade-offs in crash dynamics.