Fatigue Crack Growth for Typical CV Siderail Hole-making Processes Applied to Heat-treated Steel (MET1123) and Ultra High Strength Low Alloy Steel (120XF)

Format:

Conference/Event

Author/Creator:

Fleming, Sean, author.

Conference Name:

SAE 2009 Commercial Vehicle Engineering Congress & Exhibition (2009-10-06 : Rosemont, Illinois, United States)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 2009

Summary:

In order to provide the best siderail chassis value to the global commercial vehicle (CV) market two key aspects were investigated in this study:For acceptance in the global CV industry it was key to collaborate with recognized research and testing facilities for the respective areas of evaluation.This study was divided into 2 phases: Material evaluation and fatigue crack growth.The material evaluation phase determined monotonic properties such as strength, impact and % elongation. As part of the material evaluation the low cycle fatigue (LCF) properties were also evaluated. The heat-treated steel (MET1123) has an industry strength requirement for yield and ultimate of 120ksi (838mpa) and 130ksi (910mpa) respectively and this was met. The ultra high strength steel (120XF) is a new grade, currently in the development phase and these respective properties were slightly less than the MET1123, although very close to the industry standard. The LCF results of the MET1123 and 120XF were comparable.The next phase of the study was the fatigue crack growth. The holes were cut with: a hydraulic Punch press, CO2 laser, numerically-controlled (NC) drill and O2 Plasma torch. The coupons used were extracted from actual siderails and the holes were processed in the same fashion as the holes cut into a typical production siderail. The specimens were configured into SAE keyhole coupons. The threshold stress intensity, Kth, and crack growth rates were most favorable for the punch press. The HT (MET1123) steel outperformed the HSLA (120XF) for threshold, crack growth rates and fracture toughness for all processes

Notes:

Vendor supplied data

Publisher Number:

2009-01-2863

Access Restriction:

Restricted for use by site license