Characteristics of shear damage for 60Sn-40Pb solder material

Technical Report · Wed Dec 31 04:00:00 EST 1997

DOI:https://doi.org/10.2172/674974· OSTI ID:674974

Fang, H E ^[1]; Chow, C L; Wei, Y ^[2]

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1. Sandia National Labs., Albuquerque, NM (United States)
2. Univ. of Michigan, Dearborn, MI (United States). Dept. of Mechanical Engineering

This paper presents an investigation of the development of a continuum damage model capable of accurately analyzing shear damage in 60Sn-40Pb solder material. Based on the theory of damage mechanics, an internal state variable known as the damage variable is introduced to characterize material degradation caused by the change of material microstructures under load. A damage surface in stress space is proposed to quantify damage initiation and its successive expanding surfaces to represent damage hardening. With the aid of irreversible thermodynamics, the damage-coupled constitutive equations and the damage evolution equations are established. A failure criterion is proposed based on the accumulation of overall damage in the material. The damage model is implemented in a general purpose finite element program ABAQUS through its user-defined material subroutine UMAT. The program is applied to predict shear deformation in a notched specimen. The predicted failure mode and maximum load agree well with those measured experimentally. The effect of finite element meshing on the numerical results is also examined and discussed.

• Research Organization: Sandia National Labs., Albuquerque, NM (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: AC04-94AL85000
• OSTI ID: 674974
• Report Number(s): SAND--97-2929C; CONF-981009--; ON: DE98007162; BR: DP0101031
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
42 ENGINEERING
DEFORMATION
EXPERIMENTAL DATA
FINITE ELEMENT METHOD
HARDENING
LEAD ALLOYS
MATHEMATICAL MODELS
MICROSTRUCTURE
NOTCHES
TIN ALLOYS
VERIFICATION