A normalized damage variable for ductile metals based on toughness performance

作者：He, Min; Li, Fuguo^*; Ali, Nazakat

来源：Materials Science and Engineering A-Structural Materials Properties Microstructure and Processing, 2011, 528(3): 832-837.

DOI：10.1016/j.msea.2010.09.076

• Damage variable
• Plastic deformation
• Toughness indicator
• Repeated loading-unloading tensile tests
• Elastic modulus

The normalized damage function based on elastic modulus is proposed to evaluate damage for ductile metals under a unified criterion. An equivalent half-sine model is employed to illustrate plastic stress-strain relationship. Toughness indicator is introduced to describe the toughness character in metals. An exponential rule is employed to calculate toughness indicator, and the parameter of toughness indicator is formulated by conventional mechanical properties of metals. Repeated loading-unloading tensile tests are conducted on stainless steel and aluminium alloy. The good correlation coefficient and dispersion are presented between the experimental values and predicted values of damage variable (within 12%). The damage function with toughness indicator can be applied to predict the effective elastic modulus.

• 出版日期2011-1-25
• 单位徐州工程学院; 西北工业大学