While a direct, legally "free" full download of the recent 2022 textbook Elements of Classical Plasticity Theory by Andreas Öchsner is generally restricted by copyright, you can access several legitimate alternatives and previews. Official & Legal Resources
If you are looking for free foundational material on classical plasticity theory, consider these open-access academic sources: Elements of Classical Plasticity Theory free eb...
: Hosts older but foundational texts for free borrowing, such as Alexander Mendelson's Plasticity: Theory and Application and L.M. Kachanov's Foundations of the Theory of Plasticity. While a direct, legally "free" full download of
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: The official publisher offers the eBook for purchase . You may have free access if you are affiliated with a university or library that has a SpringerLink subscription.