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Related Concept Videos

Bending of Members Made of Several Materials01:11

Bending of Members Made of Several Materials

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In analyzing a structural member composed of two different materials with identical cross-sectional areas, it is crucial to understand how their distinct elastic properties affect the member's response under load. The analysis involves assessing stress and strain distributions using the transformed section concept, which accounts for variations in material properties.
Hooke's Law determines stress in each material, stating that stress is proportional to strain but varies due to each material's...
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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.
To illustrate this, let's consider a beam OC of 5 kN, inclined at an angle of 53.13° with the horizontal and supported at both ends. Determine the internal...
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Unsymmetric Loading of Thin-Walled Members: Problem Solving01:07

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The shear center of a channel section with uniform thickness, height, and width, is determined by computing the shear force in the member and calculating the moments of inertia of the sections.
To compute the shear forces, find the shear flow at a specific distance from the endpoint using the vertical shear and the moment of inertia values. The total shear force on the flange is calculated by integrating the shear flow from one end of the flange to the other.
Next, calculate the moments of...
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Mechanical Characteristics of Steel01:18

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The mechanical characteristics of steel are assessed through various tests that evaluate its strength, toughness, and flexibility. These tests include tension, torsion, impact, bending, and hardness assessments, each providing crucial information about steel's suitability for specific applications.
The tension test is fundamental for determining tensile strength. In this test, a steel specimen is stretched using a gripping device until it breaks. The data collected during this test are used...
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Bending of Material: Problem Solving01:09

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In this lesson, determine the ratio of the maximum bending moments applied to two metal pipes, given that both pipes can withstand a maximum stress of 100 MPa. Both pipes have an outer radius of 1.8 cm. Pipe A has an inner radius of 1.5 cm, and Pipe B has an inner radius of 1 cm. The ratio of the maximum bending moment applied to two metallic pipes, each with a different inner and outer radius, is determined by considering their dimensions. The inner radius of the first pipe is 1.5 cm, and for...
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Joints, also known as articulations, are classified based on their structural characteristics, i.e., based on whether the articulating surfaces of the adjacent bones are directly connected by fibrous connective tissue or cartilage, or whether the articulating surfaces contact each other within a fluid-filled joint cavity. These differences serve to divide the joints of the body into three structural classifications.
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Related Experiment Video

Updated: Dec 3, 2025

Artificial Thermal Ageing of Polyester Reinforced and Polyvinyl Chloride Coated Technical Fabric
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Functional Investigation on Automotive Interior Materials Based on Variable Knitted Structural Parameters.

Mao Siyao1,2, Su Liu1,2, Zhang Peihua1,2

  • 1College of Textiles, Donghua University, 2999 North Renmin Road, Songjiang District, Shanghai 201620, China.

Polymers
|October 29, 2020
PubMed
Summary

Researchers developed high-performance automotive textiles using weft-knitted fabrics. Textured polyamide yarn (DTPA) fabrics outperformed polyester (DTPE) fabrics, offering superior comfort and durability for automotive interiors.

Keywords:
automotive interiorfuzzy comprehensive evaluationmechanical propertiespolymersweft-knitted structures

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Area of Science:

  • Materials Science
  • Textile Engineering
  • Automotive Engineering

Background:

  • Technical textiles are crucial for various industries, with automotive applications rapidly expanding.
  • Weft-knitted fabrics are increasingly preferred for automotive interiors due to their extensibility, elasticity, and comfort.
  • Developing high-performance automotive fabrics requires balancing comfort and durability.

Purpose of the Study:

  • To engineer an automotive fabric with enhanced comfort and durability.
  • To investigate the impact of different weft-knitted structures and materials on fabric properties.
  • To identify an optimal fabric structure for automotive interior applications.

Main Methods:

  • Fabrication of sixteen weft-knitted fabric types using computerized flat knitting.
  • Utilizing two yarn materials: draw textured polyester (DTPE) and textured polyamide (DTPA).
  • Evaluation of durability (tensile/tear strength, abrasion resistance) and comfort (air permeability) using standardized tests and fuzzy comprehensive evaluation.

Main Results:

  • Textured polyamide yarn (DTPA) fabrics demonstrated superior overall performance compared to draw textured polyester (DTPE) fabrics.
  • Specific knit structures, including tuck stitches and weft-insert yarns, were found to enhance air permeability, strength, and dimensional stability.
  • An optimal weft-knitted fabric structure was identified for automotive interior use.

Conclusions:

  • DTPA fabrics offer a promising foundation for developing advanced automotive interior textiles.
  • Knit structure design is a key factor in optimizing fabric performance for specific applications.
  • The study provides valuable insights for the development of high-performance technical textiles in the automotive sector.