A finite element formulation and adaptive solution approach for large-scale thermomechanical problems with complex contact conditions

Conference · Wed Mar 31 00:00:00 EST 1993

OSTI ID:10184496

Engelmann, B E; Whirley, R G; Raboin, P J

Traditional thermal stress analysis is based on an uncoupled approach in which the thermal problem is solved on a fixed geometry, and the resulting temperatures are then used to load a mechanical problem. In contrast, a fully coupled thermomechanical analysis solves the thermal problem on the deforming geometry and incorporates thermal loads into the mechanical problem. Thermal contact, in which heat flow paths depend on the mechanical deformations of adjacent surfaces, is a major component of many fully coupled thermomechanical analyses. This paper describes the development of a Lagrangian finite element thermomechanical contact methodology. The paper focuses on the formulation and implementation of thermal contact in two dimensions. The proposed approach accommodates arbitrarily large relative motions of contact surfaces, fully unstructured meshes, pressure-dependent contact resistance, conduction across small gaps, and approximate models for convection and radiation. The proposed thermal contact formulation has been implemented in the Lawrence Livermore National Laboratory public code PALM2D and has been used to solve a diverse set of thermomechanical problems. Examples frustrating the performance of this code on large deformation thermomechanical problems are presented and discussed.

• Research Organization: Lawrence Livermore National Lab., CA (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 10184496
• Report Number(s): UCRL-JC-112596; CONF-930785-3; ON: DE93019605
• Resource Relation: Conference: 8. international conference on numerical methods in laminar and turbulent flow,Swansea (United Kingdom),18-23 Jul 1993; Other Information: PBD: 31 Mar 1993
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
99 GENERAL AND MISCELLANEOUS//MATHEMATICS, COMPUTING, AND INFORMATION SCIENCE
THERMAL ANALYSIS
P CODES
STRESS ANALYSIS
DEFORMATION
FINITE ELEMENT METHOD
HEAT FLOW
MESH GENERATION
CONVECTION
INTERFACES
CONSERVATION LAWS
LINEAR MOMENTUM
ENERGY
THERMODYNAMICS
420400
661300
990200
HEAT TRANSFER AND FLUID FLOW
OTHER ASPECTS OF PHYSICAL SCIENCE
MATHEMATICS AND COMPUTERS