フレキシブルプリント配線板の耐折信頼性の向上に係わる粘弾性特性の影響 : ひずみ-熱エネルギー変換による耐折寿命の改善

概要

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The mechanical reliability of flexible printed circuits (FPC) was studied with an attention to the mechanical properties, especially viscoelastic characteristics, of reinforcing and adhesive material. The bending fatigue test was carried out with employing IPC bending test machine and various specimen which contain different mechanical properties. The main results were as follows. (1) Mechanical properties of reinforcing material (super engineering plastics) had an important role on the FPC bending fatigue life. The high toughness of reinforcing material which were high elastic modulus and ductility caused improvement of FPC fatigue life. (2) The two mechanisms in the effect of viscoelasticity of adhesive material on the bending life of FPC were clarified. The fatigue life of FPC could be improved by controlling higher either the storage modulus G' or the loss modulus G" of adhesive material. (3) The new concept in FPC design was indicated in order to improve the mechanical reliability of FPC. Namely, the improvement of mechanical properties and the transformation between strain and heat energy were considered in FPC design.
一般社団法人日本機械学会の論文
1999-01-25