This is the most contentious point in engineering education forums. Unlike textbooks by Timoshenko or Beer & Johnston, John Wiley & Sons (the publisher) has never released an official, printed Instructor’s Solutions Manual for Holzapfel’s text.
I understand you're looking for a solution manual for by Gerhard A. Holzapfel . Nonlinear Solid Mechanics Holzapfel Solution Manual
While official solution manuals are often restricted to course instructors, many universities and academic platforms offer supplemental "Problem Sets" and "Lecture Notes" that mirror the exercises in Holzapfel’s book. Engaging with academic forums and ResearchGate can also connect you with researchers who have implemented these models numerically. This is the most contentious point in engineering
: Study materials and partial exercise solutions are sometimes shared on Course Hero by university students. Course Hero numerical implementation Nonlinear Solid Mechanics Holzapfel Solution Manual