作者: Hiroshima Yoshiyuki , Nakamura Naoki , Matsui Akiko , Abe Mitsunori , Kitagawa Takahiro
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摘要: A recording medium a program for process, the process includes: calculating an amount of distortion in via printed circuit board based on expression using coefficient m, Δe={(L×α×Δt×E)/(D×T)}×m, where Δe is distortion, L length via, α thermal expansion base material, Δt temperature change environment, E Young's modulus, D diameter and T thickness plating via; lifetime expression, M=N/(n×365), M n frequency change, N number cycles satisfying Nx=C/Δe.