Machine Element and System Design | Failure Theories by Pavan | Learn Smarter
K12 Students

Academics

AI-Powered learning for Grades 8–12, aligned with major Indian and international curricula.

Academics

Grades

Grade 8 Grade 9 Grade 10 Grade 11 Grade 12

Curriculum

CBSE ICSE IB
Professionals

Professional Courses

Industry-relevant training in Business, Technology, and Design to help professionals and graduates upskill for real-world careers.

Professional Courses
Games

Interactive Games

Fun, engaging games to boost memory, math fluency, typing speed, and English skills—perfect for learners of all ages.

games
Typing
Memory
Math
English Adventures
Knowledge
Failure Theories

Failure theories are essential in predicting whether materials or structures will fail under various loads. This chapter covers static failure theories, such as maximum normal stress and shear stress theories, as well as fatigue failure theories that address cyclic stress applications. It emphasizes the importance of effectively applying a factor of safety and understanding stress concentration factors in design processes.

Sections

  • 1

    Introduction To Failure Theories

    This section introduces various failure theories that predict when machine components will fail under different loads.

    Learning Practice

  • 2

    Static Failure Theories

    This section explores static failure theories that predict the failure of materials and structures under static or gradually applied loads.

    Learning Practice

  • 2.1

    Maximum Normal Stress Theory (Rankine Theory)

    The Maximum Normal Stress Theory, also known as Rankine Theory, predicts failure based on the maximum principal stress in materials, making it particularly suitable for brittle materials.

    Learning Practice

  • 2.2

    Maximum Shear Stress Theory (Tresca Theory)

    The Maximum Shear Stress Theory, also known as Tresca Theory, predicts failure in ductile materials by evaluating shear stress under applied loads.

    Learning Practice

  • 2.3

    Distortion Energy Theory (Von Mises Theory)

    The Distortion Energy Theory, also known as von Mises Theory, predicts failure in ductile materials based on the total strain energy due to distortion.

    Learning Practice

  • 2.4

    Von Mises Stress

    The von Mises Stress theory predicts failure in ductile materials by comparing induced stresses to yield strength.

    Learning Practice

  • 2.5

    Factor Of Safety (Fos)

    The Factor of Safety (FoS) is a key design metric that ensures a structure's material strength exceeds the applied loads.

    Learning Practice

  • 3

    Stress Concentration Factors (Scf)

    Stress concentration factors quantify localized stress increases in materials due to discontinuities.

    Learning Practice

  • 4

    Fatigue Failure Theories

    This section explores fatigue failure theories that predict material failure under cyclic stresses, highlighting key terms and criteria.

    Learning Practice

  • 4.1

    Key Terms

    This section introduces key terms and theories related to failure mechanisms in machine components under various load conditions.

    Learning Practice

  • 4.2

    Failure Criteria

    This section explores various failure theories used in engineering to predict when materials or structures might fail under different loads.

    Learning Practice

  • 5

    Applications

    This section discusses the various applications of failure theories in engineering design, especially for components subjected to different types of loads.

    Learning Practice

References

Module III_ Failure Theories.pdf

Class Notes

Memorization

What we have learnt

  • Failure occurs when materia...
  • Static failure theories hel...
  • Fatigue theories highlight ...

Final Test

Revision Tests