You may find previews or outdated 1999 drafts. The industry currently uses IPC-9704A (confirmed 2022). Any link to an old version is useless for certification audits.
The standard mandates the use of or three-element 0/45/90 degree rosettes . Placement is not random; gages must be mounted on the opposite side of the board from the component (mirror placement) or adjacent to the high-risk component. ipc-9704 pdf
: Mounting the PCB into a chassis or attaching heavy heat sinks. You may find previews or outdated 1999 drafts
Page 18. IPC/JEDEC 9704. • Recommended strain gages. • Gage placement and attachment. • Measurement equipment. • Data analysis. R. electronics.org IPC/JEDEC-9704 Standard Only | electronics.org ipc-9704 pdf
Let me give you the direct facts: