Distortional hardening cyclic plasticity: Experiments and modeling

René Marek, Slavomír Parma, Heidi P. Feigenbaum

Research output: Chapter in Book/Report/Conference proceedingChapter

2 Scopus citations


When the associative flow rule is used, the yield surface (YS) shape is related to the direction of plastic strain accumulation. In this case, accurate modeling of the YS shape and its changes is critical to predicting the strains seen during cyclic plastic loading. There are numerous experimental examples of the shape of the YS changing such that a sharp apex develops roughly in the direction of loading and flattening develops in the opposite direction as anisotropy develops in the material. The growth of this type of uneven distortion of the YS has been seen in a wide variety of metals under various load conditions and is often called directional distortional hardening (DDH). In this chapter, we review the literature on DDH and YS shape change and present a new segmented model for DDH. We calibrated this model and used it to simulate a directionally distorted yield surface and cyclic plastic loading. By directly comparing results with and without YS distortion, we are able to infer the role that DDH has in predicting the behavior of metals in cyclic plastic loading.

Original languageEnglish (US)
Title of host publicationCyclic Plasticity of Metals
Subtitle of host publicationModeling Fundamentals and Applications
Number of pages51
ISBN (Electronic)9780128192931
ISBN (Print)9780128192948
StatePublished - Jan 1 2021
Externally publishedYes


  • Anisotropy
  • Directional distortion
  • Directional distortional hardening
  • Distortion
  • Segmented yield function
  • Yield surface shape

ASJC Scopus subject areas

  • General Engineering


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