Do Ductile Materials Fail Due to Shear or Tensile Stress?

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SUMMARY

Ductile materials primarily fail due to shear stress rather than tensile stress. This conclusion is supported by the understanding that ductile materials exhibit significant plastic deformation before failure, leading to shear failure mechanisms. In contrast, brittle materials, such as concrete, fail under tensile stress, typically fracturing at a 45-degree angle under axial loading. This distinction is crucial for material selection and structural design in engineering applications.

PREREQUISITES
  • Understanding of material properties, specifically ductility and brittleness.
  • Knowledge of stress types, including shear and tensile stress.
  • Familiarity with failure modes in materials science.
  • Basic principles of axial loading in structural engineering.
NEXT STEPS
  • Research the mechanics of shear failure in ductile materials.
  • Study the differences between ductile and brittle fracture mechanisms.
  • Explore the implications of material selection in structural engineering.
  • Learn about stress-strain curves and their relevance to material failure.
USEFUL FOR

Engineers, materials scientists, and students studying mechanical properties of materials will benefit from this discussion, particularly those interested in the failure mechanisms of ductile and brittle materials in structural applications.

Dell
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in general, do ductile matreials fail due to shear or tensile stress

i think that my lecturer said that brittle materials (such as concrete) will fail due to a low maximum shearing stress therefore breaking at 45 degrees in axial loading, and ductile materials have low tensile stress leaving a flat 180 degree break, but i read somewhere that it is the opposite, could someone clear this up for me
 
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You misremembered what your lecturer said, or that person was wrong. Ductile materials fail in shear.
 

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