Title
Comparison of membrane punching experiments with biaxial tension/shear testing for characterization of fracture of uncracked bodies
Author
Walters, C.L.
TNO Bouw en Ondergrond
Publication year
2010
Abstract
A high strength steel (DP780was characterized for fracture with the Modified Mohr Coulomb (MMCaccumulated damage approach. Two different methods were used for the characterization and are compared in this paper. The first method, which is representative of procedures used in the sheet metal forming industry, features specimens being membrane loaded by a hemispherical punch. The state of stress at fracture is changed through the shape of the specimen. In the second method, the specimen features a lofted cutout geometry in the center. All of the specimens are the same shape, and the state of stress is changed by applying different combinations of shear and tensile forces to the specimen. Calibration of the MMC fracture locus was first done with both types of specimens, and then data points were removed to explore the importance of the various conditions in achieving an accurate calibration. The data from both methods agreed well with the MMC fracture theory when all data points were used, thus validating the applicability of the MMC criterion to this material. Removal of all data other than the punch experiments revealed that the punch experiments alone are capable of giving an approximate characterization of the MMC fracture surface. However, it is shown that only a single data point (pure shearis necessary in combination with punching tests to determine a very good calibration parameters for the MMC.
Subject
Building Engineering & Civil Engineering
SD - Structural Dynamics
TS - Technical Sciences
High Tech Maritime and Offshore Systems
Marine
Industrial Innovation
Advanced High Strength Steel (AHSS butterfly test
Biaxial fracture testing
Damage mechanics
DP780
Failure modeling
Punch testing
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TNO identifier
466470
Source
18th European Conference on Fracture: Fracture of Materials and Structures from Micro to Macro Scale, ECF 2010, 30 August 2010 through 3 September 2010, Dresden
Document type
conference paper