Study of the properties of anaerobic adhesives cured in cylindrical joints

Corigliano

Barone

et al. 2022

Metals

This scientific study aims to validate the applicability of a micromechanical model for predicting the static shear strength of hybrid interfaces that are pressure-reinforced and bonded with anaerobic adhesives. To identify the parameters for the micromechanical model, a systematic experimental test plan involving high-strength steel butt specimens bonded with anaerobic adhesive in a finite thickness was performed. The experimental investigation was based on torque tests, which provided the shear strength of two anaerobic adhesives subjected to different values of contact pressure, ranging from 0 up to 1000 MPa. Based on the intrinsic high-pressure properties of the finite-layer adhesives, the formerly developed micromechanical model of hybrid interfaces satisfactorily predicted the macroscopic strength of tightened-bonded joints taken from the literature.

Section: Test Bench and Test Proceduresmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Predicting the Macroscopic Shear Strength of Tightened-Bonded Joints from the Intrinsic High-Pressure Properties of Anaerobic Adhesives

Corigliano

Barone

et al. 2022

Metals

“…In addition, different anaerobic adhesives will be examined in order to assess if their response has the same trend with contact pressure. 1Top adherend (2) Bottom adherend 3Top crosshead (4) Bottom crosshead (5) Clamp (6) Encoder frame 7Encoder rotor (8) Centering bushing (9) Bolt-nut fastener…”

Section: Cohesive-friction Modelmentioning

confidence: 99%

“…The work aims to assess if the combination of a cohesive law with a pure friction law is able to describe the response of an hybrid interface up to complete failure: in particular, to put to test a simple response linearly dependent by the contact pressure, summing up to a constant term. Anaerobic adhesives are a simple and effective solution to improve the performances of friction joints, where the coupling forces are provided by mechanical clamping [1][2][3][4][5][6] . According to the literature [7][8][9][10] , the static shear strength of hybrid friction bonded joints is the result of two contributions: the strength of the adhesive and the friction between the interfaces of the joint.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation and Model Validation of the Shear Strength of Hybrid Interfaces up to Complete Failure

The Journal of Adhesion

Dragoni

2015

The paper experimentally investigates hybrid interfaces pressure-reinforced and bonded with anaerobic adhesive. While their static strength has been deeply investigated, their behavior up to complete failure lacks of a constitutive model. This work aims to assess the applicability of a simple model involving a cohesive law and a pure friction law, in order to describe the interface behavior up to complete failure under different contact pressure levels. A systematic experimental campaign investigates the shear strength of cylindrical specimens butt-bonded and pressure reinforced over an annular surface. The tests involve two anaerobic adhesives and four pressure levels. The experimental torque-rotation curves confirm that the strain energy up to complete failure is given by a cohesive term and a pure friction term, both of them linearly dependent upon the contact pressure.

“…Sekercioglu et al [6]- [8] investigate the effect of interference fit, bonding clearances, surface roughness, adherent and temperature on the static and dynamic strength of adhesively bonded cylindrical components. Aronovich et al [9] review the properties of anaerobic adhesive materials during testing and their applications in cylindrical coaxial joints. Mengel et al [10] show that hydrostatic pressure on adhesive during the curing process significantly increases the strength of the joint.…”

mentioning

confidence: 99%

Experimental Assessment of a Micro-Mechanical Model for the Static Strength of Hybrid Friction-Bonded Interfaces

The Journal of Adhesion

Dragoni

2013

Anaerobic adhesives are thermosetting acrylic polymers commonly used to improve the performance of most metal joints. Researches on the static strength of hybrid joints, available in the technical litera-ture, show scanty and contradictory results that do not explain the effect of anaerobic adhesive on the hybrid joint behaviour. An early study by one of the authors of the present study formulates a micro-mechanical model describing the shear power of anaerobic adhesives as a function of the intimate properties of adherends and adhesive at the interface. According to the micro-mechanical model, the high local pressure acting on the thin film of adhesive trapped between the crests of the mating surfaces improves the film shear strength upon the adhesive’s shear strength at zero pressure. The present work aims to assess this micro-mechanical model through a systematic experimental campaign. The tests are conducted on simple tubular specimens and consider three vari-ables over two levels: adhesive-type (weak and strong anaerobic), pressure level during polymerization (0.5 and 134MPa), and pressure level during failure test (0.5 and 134MPa). The results confirm the proposed micro-mechanical model, and highlight that shear strength slightly differs by applying pressure before or after polymerization