Abstract Focusing on the size effect which appears during the process of micro scale stamping, a new fracture criterion was derived from the constitutive equation based on strain gradient. Then, the stamping process of thin sheet was studied to obtain the relationship between the forming depth and strain. As a result, the limit of forming depth could be predicted accurately. Finally, a series of micro stamping experiments were conducted, which shows that the new fracture criterion is available.
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Received: 30 March 2010
Published: 27 January 2011
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