Analysis of fatigue cracks in center cracked panels and cold-worked fastener holes

Conference · Fri Jan 01 04:00:00 EST 1982 · Am. Soc. Mech. Eng., (Pap.); (United States)

OSTI ID:5473520

Nakagaki, M; Atluri, S N

This paper presents a quasi-static elastic-plastic finite element analysis of fatigue growth of cracks in center cracked panels and near cold-worked fastener holes. In this analysis, singular finite elements, within which are embedded the HRR singularities for strains/stresses, are used. Crack growth is simulated by the translation of these elements, in the direction of crack-growth, in a Lagrangean finite element mesh. To simulate a coldworking process, uniform radial loads are applied incrementally at the hole surface so that the radius of the elastic-plastic boundary is several times the hole radius. The applied loads are removed incrementally, to complete the cold-working process. Several cases of cracks, with variation of the ratio of crack length to the residual compressive zone due to cold working, are studied under different spectra of loading. In each case, crack-closure and opening stresses are numerically obtained. From these extensive studies, certain conclusions on the crack growth retardation effects due to cold working, that are germane in a rational fatigue life evaluation, are presented.

• Research Organization: Naval Research Labs., Washington, DC
• OSTI ID: 5473520
• Report Number(s): CONF-820601-
• Conference Information: Journal Name: Am. Soc. Mech. Eng., (Pap.); (United States) Journal Volume: 82-PVP-24
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
420100* -- Engineering-- General Engineering-- (-1987)
COLD WORKING
COMPRESSION
COMPUTERIZED SIMULATION
CRACK PROPAGATION
DYNAMIC LOADS
ELASTICITY
FABRICATION
FASTENERS
FATIGUE
FINITE ELEMENT METHOD
FRACTURE MECHANICS
FUNCTIONS
HOLES
LAGRANGIAN FUNCTION
MATERIALS WORKING
MECHANICAL PROPERTIES
MECHANICS
MESH GENERATION
NUMERICAL SOLUTION
PLASTICITY
SERVICE LIFE
SIMULATION
SINGULARITY
SPECTRAL RESPONSE
STRAINS
STRESS ANALYSIS
STRESSES
TENSILE PROPERTIES