Abstract
This study aimed to reveal the interface behavior of iron-based shape memory alloy (Fe-SMA) strips bonded to metallic substrates in order to ensure the integrity of such joints. A series of single lap-shear tests was performed on Fe-SMA-to-steel adhesively bonded joints. The test results reveal that the bond strength can reach over 70% of the tensile strength of the Fe-SMA and the cohesive failure mode can be realized. It is identified that three energy dissipation mechanisms occurred during the debonding process, indicating that the experimentally obtained bond-slip relations represent more than the energy dissipation by the failure of the adhesive.
Highlights
The interface failure of adhesively bonded iron-based shape memory alloy strips (Fe-SMA) joints is crucial to be examined in order to ensure the structural integrity
It is identified that three energy dissipation mechanisms occurred during the debonding process, indicating that the experimentally obtained bond-slip relations represent more than the energy dissipation by the failure of the adhesive
This paper presents an experimental study on the interface failure behavior of Fe-SMA-to-steel adhesively bonded joints
Summary
The interface failure of adhesively bonded iron-based shape memory alloy strips (Fe-SMA) joints is crucial to be examined in order to ensure the structural integrity. A recent cost analysis revealed that even though the current price of Fe-SMA material is higher than that of normal modulus (NM) CFRPs, the end costs of both strengthening solutions are comparable [6] This is mainly attributed to the relatively high cost of the mechanical clamping systems that are required for prestressed CFRP applications [6]. Single lap-shear tests have been typically employed to study the interface behavior of reinforcements, normally CFRP strips, externally bonded to steel structures and mode II bond-slip relations have been obtained based on the experimental measurements for the fracture analysis of the debonding process [16]. Particular emphasis is placed on the effect of nonlinear behavior of the Fe-SMA on the debonding process and the obtained bond-slip relations This test campaign was carried out as a first step towards the development of a prestresssed bonded Fe-SMA solution for vast metallic structures
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