Prediction of Deep Drawing Ratio for DP800 Steel by Using Modified-Mohr-Coulomb Damage Criteria

Abstract

The demand for low-cost production in vehicle manufacturing while complying with the safety and environmental regulations is an enormous challenge. To comply with these challenges, sheet metal forming industries now extensively use advanced high-strength steels (AHSSs) in their products. However, due to excellent strength levels of AHSSs, problems arising in their forming stage, such as large spring-back and fracture, hinder the manufacturing process. At this stage, implementing finite element analysis (FEA) in the design processes greatly improves manufacturing processes since it allows determining possible forming errors before the actual forming process. In this study, the formability of DP800 steel has been investigated by carrying out deep drawing experiments. For that, a series of circular sheet metals, whose diameters were incrementally increased, have been deep drawn to a cup shape to determine the limiting drawing ratio (LDR). Additionally, Modified Mohr-Coulomb damage model has been utilised to predict the LDR in FEA. It has been found that the LDR of DP800 is 2.13 and the implemented damage model can successfully predict the LDR within only 2.35% error.

Keywords

• DP800 steel
• Deep drawing ratio
• Finite element analysis

Modified- Mohr Coulomb Hasar Kriteri Kullanılarak DP800 Çeliğinin Derin Çekme Oranının Tahmini

Abstract

Araç imalatında güvenlik ve çevre düzenlemelerine uyum sağlarken düşük maliyetli üretim talebi muazzam bir zorluktur. Bu zorluklara uyum sağlamak için, sac metal şekillendirme endüstrileri artık ürünlerinde yaygın olarak gelişmiş yüksek dayanımlı çelikler (AHSS'ler) kullanmaktadır. Ancak, AHSS'lerin mükemmel dayanım seviyeleri nedeniyle, büyük geri yaylanma ve kırılma gibi şekillendirme aşamalarında ortaya çıkan sorunlar üretim sürecini engellemektedir. Bu aşamada, tasarım süreçlerinde sonlu elemanlar analizinin (FEA) uygulanması, gerçek şekillendirme sürecinden önce olası şekillendirme hatalarının belirlenmesine olanak tanıdığı için üretim süreçlerini büyük ölçüde iyileştirmektedir. Bu çalışmada, derin çekme deneyleri gerçekleştirilerek DP800 çeliğinin şekillendirilebilirliği araştırılmıştır. Bunun için, çapları kademeli olarak artırılan bir dizi dairesel sac metal, derin çekme oranını (LDR) belirlemek için bardak formunda derin çekilmiştir. Ek olarak, Değiştirilmiş Mohr-Coulomb hasar modeli, FEA'daki LDR'yi tahmin etmek için kullanılmıştır. DP800'ün LDR'sinin 2.13 olduğu ve uygulanan hasar modelinin LDR'yi sadece %2.35 hata payıyla başarılı bir şekilde tahmin edebildiği bulunmuştur.

Keywords

• DP800 Çeliği
• Derin çekme oranı
• Sonlu elemanlar analizi

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