The standard outlines test methods for evaluating the performance of printed boards, including:
Do not pay for it yet. If you outsource your assembly to a CM, Most high-reliability CMs (like Benchmark, Jabil, Flex, or reputable regional shops) already own a corporate license for the entire IPC library. They can: ipc-9704 pdf
The IPC/JEDEC-9704A guideline identifies specific high-risk moments where strain gage testing is critical: The Ultimate Guide to IPC-9704 PDF: Understanding Printed
You should characterize any process that involves mechanical loading or board flexure: Using IPC/JEDEC-9704 & 9702 Standards for Strain Gauge What is IPC-9704