Development of a Method to Predict Fatigue Failure Life of Junction Block Bracket Using CAE

Kouji Ohta; Yasushi Sugiyama; Hitoshi Kawabe; Yoshihiro Kohtake; Masashi Narita; Tomohiro Keishi; Mikio Kaji

doi:10.4271/2001-01-1099

2001-03-05

Development of a Method to Predict Fatigue Failure Life of Junction Block Bracket Using CAE 2001-01-1099

With the rapid advances in electronic control within automobiles, the junction block (J/B), primarily used for electrical transmission and electrical wiring, has begun to house electronic control units. It is evolving into an active component with smart functions that also controls vehicle devices, at the core of the wiring harness.

We have developed a method using CAE to predict the fatigue failure life of J/B brackets for use as a design-assist tool in the early stage of J/B development.

Failure of J/B brackets starts with the repetitive stress generated in the brackets during resonance. This stress is maximum at primary natural vibration which is the lowest frequency during resonance.

By accurately estimating the above-mentioned stresses using CAE, we established a method to determine the number of vibrations at which fatigue failure of the J/B bracket would occur (fatigue failure life) from the fatigue failure life characteristics of the material.

It is expected that the man-hours required to perform conventional evaluation tests will be greatly reduced by utilizing this method.

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Development of a Method to Predict Fatigue Failure Life of Junction Block Bracket Using CAE 2001-01-1099

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