Accession Number : ADA335036

Title :   Finite Element Analysis of the Double Lap Joint with an Elastic-Plastic Adhesive

Descriptive Note : Technical rept

Corporate Author : AERONAUTICAL AND MARITIME RESEARCH LAB MELBOURNE (AUSTRALIA)

Personal Author(s) : Pickthall, C. ; Heller, M. ; Rose, L.

PDF Url : ADA335036

Report Date : MAY 1997

Pagination or Media Count : 32

Abstract : For an effective adhesively bonded reinforcement of a (typically cracked) plate, sufficient load must be transferred by the adhesive into the reinforcement to prevent the underlying damage from growing. Under severe load, the adhesive may yield plastically. Notwithstanding possible adhesive failure, this may be beneficial to the reinforcement by reducing the peak stress adjacent to the crack. In this paper, characterisation of this stress reduction compared to the (non-yielding) elastic case, was sought by examining the influences of configurational parameters including plate, adhesive and reinforcement moduli, and adhesive yield stress. Finite element (FE) analyses were conducted for a two-dimensional section through a double-sided (symmetric) lap joint, representative of a typical repair. Stress reductions in the reinforcement of the order of 25% were found. The adhesive yield was shown to be dominated by shear stress, and thus the adhesive behaved essentially one-dimensionally. The linear increase in plastic zone length with applied load, as predicted by the Hart-Smith one-dimensional theory, was rn good agreement with the FE results. However the observed load transfer length was 6-18% longer than predicted.

Descriptors :   *FINITE ELEMENT ANALYSIS, *ADHESIVE BONDING, STRESSES, PEAK VALUES, ELASTIC PROPERTIES, FAILURE, REDUCTION, REPAIR, LENGTH, SHEAR STRESSES, YIELD, PLASTIC PROPERTIES, TRANSFER, ADHESIVES.

Subject Categories : Numerical Mathematics
      Couplers, Fasteners, and Joints

Distribution Statement : APPROVED FOR PUBLIC RELEASE