Fatigue Strength Of FRP/metal Adhesive Joints Under Low Temperature
Author(s)
T. Hattori
Abstract
Fatigue strength of FRP/metal adhesive joints
under low temperature
T. Hattori
Department of Mechanical and System Engineering, Gifu University,
1-1, Yanagido, Gifu, Japan
Abstract
In this paper we developed the fatigue strength and fatigue life evaluation
methods of FRP/Metal adhesive joints under low temperatures. Firstly we
present fatigue strength and delamination propagation rate evaluation methods
using two stress singularity parameters H and λ which express stress
distributions at bonding edge or delamination edges as follows.
τ(r) = H/rλ
Here τ(r) is stress (MPa), r is the distance (mm) from the singular point (bonding
edge or delamination edge), H is the intensity of stress singularity, and λ is the
order of stress singularity. Then the delamination propagation rates of the double
lap joints under mechanical cyclic loadings at room temperature were measured.
Using the relationship between the measured delamination propagation rates and
the analyzed range of stress singularity intensity values we estimated the fatigue
strength of embedded adhesive joints. We can confirm that these estimated
results coincided well with the experimental results. Then we performed fatigue
tests under LN2 temperatures, and we present thermal effect evaluation methods
of fatigue strength and delamination propagation rate by separating the residual
stress effect and pure temperature effect independently.
Keywords: adhesive joints, FRP, fatigue strength, stress singularity parameters,
thermal stress, delamination propagation rate.
1 Introduction
Fiber reinforced plastics (FRP) have high strength, high rigidity and excellent
thermal isolation characteristics so they are used for cryogenic structures such as
superconducting magnets. In these cases the FRP structures are ordinary
adhesively jointed with metal structures. In these FRP/Metal adhesive joints high
Keywords
adhesive joints, FRP, fatigue strength, stress singularity parameters,
thermal stress, delamination propagation rate.
Related Book
Other papers in this volume
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