Browse Publications Technical Papers 2019-01-1086
2019-04-02

Tooling Effects on Edge Stretchability of AHSS in Mechanical Punching 2019-01-1086

Edge stretchability reduction induced by mechanical trimming is a critical issue in advanced high strength steel applications. In this study, the tooling effects on the trimmed edge damage were evaluated by the specially designed in-plane hole expansion test with the consideration of three punch geometries (flat, conical, and rooftop), three cutting clearances (6%, 14%, and 20%) and two materials grades (DP980 and DP1180). Two distinct fracture initiation modes were identified with different testing configurations, and the occurrence of each fracture mode depends on the tooling configurations and materials grades. Digital Image Correlations (DIC) measurements indicate the materials are subject to different deformation modes and the various stress conditions, which result in different fracture initiation locations. Based on the comparison of hole expansion ratios (HER), the rooftop punch produced the mostly damaged hole with the lowest HER, and failure mode was dominated by edge fracture.

SAE MOBILUS

Subscribers can view annotate, and download all of SAE's content. Learn More »

Access SAE MOBILUS »

Members save up to 18% off list price.
Login to see discount.
Special Offer: Download multiple Technical Papers each year? TechSelect is a cost-effective subscription option to select and download 12-100 full-text Technical Papers per year. Find more information here.
We also recommend:
TECHNICAL PAPER

Estimation of Cutting Parameters in Two-Stage Piercing to Reduce Edge Strain Hardening

2019-01-1092

View Details

TECHNICAL PAPER

Numerical Investigation of Optimal Rooftop Punch Shape for Force Reduction and Dimensional Accuracy Control

2019-01-1091

View Details

TECHNICAL PAPER

Prediction of Ductile Fracture Propagation of High Strength Steels in Automotive Structures

2019-01-1097

View Details

X