You do need a patched PDF. Here are safe, legal alternatives:
Theory of Elasticity and Plasticity by H. Jane Helena is a textbook published in 2017 by PHI Learning Private Limited You do need a patched PDF
H. Jane Helena is an Associate Professor at Anna University, specializing in structural and steel-concrete composite engineering. Her book is designed for undergraduate and postgraduate engineering students in civil, mechanical, and aeronautical fields. You do need a patched PDF
If you need this material for your studies, here are the safest and most reliable sources: THEORY OF ELASTICITY AND PLASTICITY - Google Books You do need a patched PDF