Beyond yield, deformation is permanent and requires plastic analysis.
Beyond yield, deformation is permanent; stress and strain are no longer proportional. Plastic design uses plastic moment M_p=σy·Z, and collapse occurs when plastic hinges form a mechanism. Strain hardening raises strength with deformation.
A paperclip bent beyond yield stays bent.
Beyond yield, materials deform permanently, and plastic analysis gives the true load capacity of ductile structures and forming processes.
Beyond yield, deformation is permanent and requires plastic analysis.
Beyond yield, materials deform permanently, and plastic analysis gives the true load capacity of ductile structures and forming processes.
Elastic deformation is fully recovered when the load is removed. Plastic deformation is permanent and remains after unloading.
A region of a beam where the moment has reached the plastic moment, and the section can rotate as a hinge, which is used to find collapse loads.
Typical applications include computing the collapse load of a steel frame under overload, estimating the force needed to bend a steel plate in a press and designing a shackle that deforms safely before fracture.
Study "Creep" first (topic 70 of 106 in Engineering Mechanics). It covers the groundwork this topic builds on.
Shape factor Z/S≈1.5 for rectangles. Bauschinger effect. Ductility allows redistribution.
A paperclip bent beyond yield stays bent.
The next topic is "Residual stress", which builds directly on this one.
It is classed as Intermediate in Engineering Mechanics (topic 71 of 106). It is an intermediate topic. Work through the beginner topics in Engineering Mechanics first.
Want to practise? Open the interactive course for quick checks, quizzes, simulations and progress tracking.