塑性と加工
Online ISSN : 1882-0166
Print ISSN : 0038-1586
ISSN-L : 0038-1586
論文
異方損傷モデルによる冷間鍛造における延性破壊の予測手法の提案
渡邊 敦夫早川 邦夫藤川 真一郎志賀 則幸
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ジャーナル 認証あり

2019 年 60 巻 703 号 p. 221-227

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抄録

Product defects have been predicted by numerical simulations in cold forging. Various ductile fracture prediction equations have been proposed, some of which have already been implemented in commercial finite element codes. However, there are still some cases where the fractured region of actual products cannot be predicted using the existing ductile fracture prediction equations. In the present paper, a new equation for predicting ductile fracture was proposed, which can improve the prediction accuracy of ductile fracture was proposed. The proposed equation was expressed as a second-rank symmetric tensor, which is a product of the stress tensor and strain increment tensor. The effectiveness of the proposed equation was confirmed in a uniaxial tension test of a notched round bar. Next, the proposed equation was applied to the cold forging of a hollow shaft. As a result, the calculated most-damaged region was corresponded to the actual fractured region of the product.

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© 2019 一般社団法人 日本塑性加工学会
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