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Sumitomo Electric Industries, Limited

Sumitomo Wiring Systems, Limited

Kouji Ohuchi

Takuya Inoue

Yuki Kawakita

Hitoshi Kawabe

Hisayoshi Onoue

Masaru Furusyo

Mikio Kaji

Hiroshi Kawauchi

Diameters and the number of respective wires are inputted, and a diameter of a virtual wire formed by converting a wire bundle to a model through a predetermined arithmetic expression derived from rule of thumb, and based upon this, a flexure life estimating process of the virtual wire is carried out. It is possible to easily estimate the flexure life and also to estimate the flexure life and obtain the results immediately after an application subject and a wire harness to be placed have been designed; thus, it becomes possible to shorten the developing period.

Flexure life estimating method, wire harness designing method and program thereof

A master curve indicating correlation between a bending life and a distortional change quantity of a wire is previously acquired. The master curve is acquired by repetitively bending a single wire and analyzing (CAE analysis with a computer or the like) a distortional change quantity (&Dgr;&egr;) of the surface of its insulating layer while actually measuring the bending life. Then, the distortional change quantity (&Dgr;&egr;) of the surface of the insulating layer of the wire or the like regarded as the object for predicting the bending life is calculated (CAE analysis or the like). The bending life of the wire or the like is predicted by collating the calculated distortional change quantity (&Dgr;&egr;) of the wire or the like serving as the prediction object with the aforementioned master curve. The bending life can be correctly predicted regardless of product conditions of the wire or the like.

Method of predicting bending life of electric wire or electric wire bundle

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Osaka, Japan

Kouji Ohuchi