Material Analysis
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Utilization of LCP Orientation-Direction Mechanical Property Differences
Problem Phenomenon
【Problem Phenomenon】The longitudinal tensile strength of the same LCP specimen can be about 3 times the transverse, and the dispersion of test data causes misjudgment
Cause Analysis
LCP molecular chain flow orientation makes longitudinal strength significantly higher than transverse; test values differ greatly with different sampling directions; the MEMS textbook records that longitudinal strength can be 3 times the transverse
Solution
Mark the direction in test sampling and unify the orientation benchmark; in design, arrange the flow direction according to the stress direction to utilize the high longitudinal strength; for verification, conservatively take the low transverse value; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
LCP performance data must carry direction; design verification uses the conservative transverse value; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a troubleshooting reference for subsequent similar problems
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