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Related Concept Videos

Bending of Members Made of Several Materials01:08

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...
143
Members Made of Elastoplastic Material01:19

Members Made of Elastoplastic Material

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The behavior of elastoplastic materials under bending stresses, particularly in structural members with rectangular cross-sections, is crucial for predicting material responses and understanding failure modes. Initially, when a bending moment is applied, the stress distribution across the section follows Hooke's Law and is linear and elastic. This distribution means the stress increases from the neutral axis to the maximum at the outer fibers, up to the elastic limit.
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Strength of Cement01:20

Strength of Cement

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Strength tests for cement are not performed directly on neat cement paste due to difficulty in obtaining consistent, reliable specimens. Instead, cement is typically tested in the form of cement-sand mortar.
For compressive strength tests, ASTM C 109-05 standards prescribe a cement-sand mix ratio of 1:2.75 and a water/cement ratio of 0.485 for making 2-inch cubes. These cubes are mixed, cast, and cured in saturated lime water at 23°C until testing. Flexural strength testing, outlined in...
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Hooke's Law

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Hooke's law, a pivotal principle in material science, establishes that the strain a material undergoes is directly proportional to the applied stress, defined by a factor called the modulus of elasticity or Young's modulus.
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Behavior of Concrete Under Compressive Load01:23

Behavior of Concrete Under Compressive Load

149
Concrete exhibits specific behaviors under different compressive loads. Understanding this is crucial for understanding its structural integrity. When concrete undergoes uniaxial compression, it tends to develop cracks that run parallel to the direction of the force. These parallel cracks stem from localized tensile stresses that occur perpendicular to the compression direction. Additionally, angled cracks may appear due to the formation of shear planes.
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Temperature Dependent Deformation01:12

Temperature Dependent Deformation

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In a nonhomogeneous rod made up of steel and brass, restrained at both ends and subjected to a temperature change, several steps are involved in calculating the stress and compressive load. Due to the problem's static indeterminacy, one end support is disconnected, allowing the rod to experience the temperature change freely. Next, an unknown force is applied at the free end, triggering deformations in the rod's steel and brass portions. These deformations are then calculated and added...
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Material Performance Evaluation for Customized Orthoses: Compression, Flexural, and Tensile Tests Combined with

Daniela Trindade1,2,3, Rachel Habiba1,4, Cristiana Fernandes1

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Summary

Custom 3D-printed orthoses offer improved patient quality of life. Polycarbonate, polylactic acid, and ULTEM™ 1010 show superior performance for durable ankle-foot orthoses fabrication.

Keywords:
additive manufacturingankle–foot orthosiscustomized orthosesmechanical propertiespolymeric materialsstatic conditions

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Area of Science:

  • Biomaterials Engineering
  • Orthotics and Prosthetics
  • Additive Manufacturing

Background:

  • Customized orthoses significantly improve patient quality of life.
  • Additive manufacturing (AM), particularly fused deposition modeling (FDM), offers enhanced precision, speed, and comfort in orthotic fabrication.

Purpose of the Study:

  • To evaluate the mechanical performance of nine polymeric materials for 3D-printed orthoses.
  • To compare material performance based on printing direction (horizontal vs. vertical).
  • To identify optimal materials for fabricating durable and high-performing orthoses.

Main Methods:

  • Mechanical testing (compressive, flexural, tensile) of nine polymers printed via FDM.
  • Comparative analysis of material properties based on printing orientation.
  • Finite element modeling (FEM) of an ankle-foot orthosis (AFO) under static load.

Main Results:

  • Polycarbonate (PC), polylactic acid (PLA), and ULTEM™ 1010 demonstrated superior mechanical properties.
  • These materials exhibited minimal performance variation between horizontal and vertical printing directions.
  • FEM simulations indicated favorable deformation, strain, and stress distribution for ULTEM™ 1010.

Conclusions:

  • PC, PLA, and ULTEM™ 1010 are highly suitable for 3D-printed orthoses due to their mechanical strength and directional consistency.
  • ULTEM™ 1010 is identified as a prime candidate for advanced orthotic fabrication, offering enhanced performance and durability.
  • This study provides valuable data for optimizing material selection in custom orthotic device design.