Finite element analysis for the initiation of lamellar tearing in welded joints

Conference · Tue Jan 01 00:00:00 EST 1980

OSTI ID:5271740

Krieg, R D; Thomas, R K

A numerical procedure using the finite element method is presented for predicting the initiation of lamellar tearing in fillet welded T-joints commonly employed in large structures. Starting with a prescribed geometry, the welding process is approximated by a known time-dependent volumetric heat source which simulates the arc heating and deposition of liquid metal. The transient nonlinear thermal and stress problems are then solved using finite element computer codes. Results of the elastic-plastic stress analysis are presented showing a predicted region of incipient lamellar tearing based on a ductile fracture theory which qualitatively agrees with the size and location of tears typically observed in photomicrographs. Additional insight into post failure crack length and stability is presented based on a simplified linear elastic fracture mechanics approach. Although the analysis procedure shows signs of promise, several weak points in the model are pointed out which must be improved before lamellar tearing can be quantified in an approach of this general type.

• Research Organization: Sandia National Labs., Albuquerque, NM (USA)
• DOE Contract Number: AC04-76DP00789
• OSTI ID: 5271740
• Report Number(s): SAND-79-1891C; CONF-800804-10; TRN: 80-010543
• Resource Relation: Conference: ASME century 2 emerging technology conference, San Francisco, CA, USA, 10 Aug 1980
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
WELDED JOINTS
FRACTURES
RUPTURES
DUCTILITY
ELASTICITY
FINITE ELEMENT METHOD
MATHEMATICAL MODELS
PLASTICITY
SHEAR
STRESS ANALYSIS
STRESSES
THERMAL CONDUCTIVITY
FAILURES
JOINTS
MECHANICAL PROPERTIES
NUMERICAL SOLUTION
PHYSICAL PROPERTIES
TENSILE PROPERTIES
THERMODYNAMIC PROPERTIES
360103* - Metals & Alloys- Mechanical Properties
360104 - Metals & Alloys- Physical Properties