Experimental characterization of Mode II fatigue delamination growth onset in composite Joints

2021 ◽  
pp. 002199832110567
Author(s):  
Felipe P Garpelli ◽  
Francis M González Ramírez ◽  
Rita de Cássia M Sales ◽  
Mariano A Arbelo ◽  
Marcos Y Shiino ◽  
...  
Keyword(s):  
Failure Process ◽  
Strain Energy Release ◽  
Fatigue Loading ◽  
Mode Ii ◽  
Adhesive Failure ◽  
Cohesive Failure ◽  
Delamination Growth ◽  
Pull Out ◽  
Composite Joint ◽  
Bonded Composite

In this article, the structural behavior of co-cured composite joint (CC), co-bonded composite joint (CB), and secondary-bonded composite joint (SB) under Mode II fatigue loading was evaluated. Fatigue performance was evaluated in sub-critical strain energy release rate (SERR) associated with Mode II fatigue induced delamination growth onset. Fatigue tests were carried out using the three-point bending End Notched Flexure test setup for different energy ratios. The experimental results are presented in terms of SERR versus number of cycles, and the SERR threshold for no growth is determined (Gth). Fractographic analyses were performed in order to identify the main failure mechanisms related to each joining technology under Mode II. The results indicated an initial cohesive failure followed by an adhesive failure promoted by crack propagation at the interface between the adhesive and the composite adherend on SB and CB samples, through the coalescence of microcracks that promote the adhesive failure process, leading to fiber pull-out from the matrix and cusps formation in the fracture surface. These results explain the low performance behavior observed on SB and CB bonded techniques. It is worth mentioning that the results and behavior observed in this work are valid only for the laminates, adhesives, surface treatment, and environmental conditions tested herein.

scholarly journals Interaction of Mixed Mode Loading on Cyclic Debonding in Adhesively Bonded Composite Joints

1987 ◽  
Vol 109 (1) ◽  
pp. 17-21 ◽  
Author(s):  
S. Mall ◽  
M. A. Rezaizadeh ◽  
R. Gurumurthy
Keyword(s):  
Mixed Mode ◽  
Strain Energy ◽  
Strain Energy Release ◽  
Analytical Investigation ◽  
Mode I ◽  
Adhesively Bonded ◽  
Total Strain Energy ◽  
Composite Joint ◽  
Governing Factor ◽  
Bonded Composite

A combined experimental and analytical investigation of an adhesively bonded composite joint was conducted to characterize the fracture mode dependence of cyclic debonding. The system studied consisted of graphite/epoxy adherends bonded with EC 3445 adhesive. Several types of specimens were tested which provided the cyclic debond growth rate measurements under various load conditions: mode I, mixed mode I and II, and almost mode II. This study showed that the total strain-energy-release rate was the governing factor for cyclic debonding.

Mode II delamination of carbon-glass fiber/epoxy hybrid composite under fatigue loading

2022 ◽  
Vol 154 ◽  
pp. 106574
Author(s):  
Francisco Maciel Monticeli ◽  
Maria Odila Hilário Cioffi ◽  
Herman Jacobus Cornelis Voorwald
Keyword(s):  
Glass Fiber ◽  
Hybrid Composite ◽  
Fatigue Loading ◽  
Mode Ii

scholarly journals Repair Bond Strength of Composite to Zirconia Ceramic Using Two Types of Zirconia Primers

2020 ◽  
Author(s):  
Hoseinali Mahgoli ◽  
Mahnaz Arshad ◽  
Kamran Rasouli ◽  
Ali Akbar Sobati ◽  
Ahmad Reza Shamshiri
Keyword(s):  
Bond Strength ◽  
Shear Bond Strength ◽  
Composite Resin ◽  
Zirconia Ceramic ◽  
Adhesive Failure ◽  
Cohesive Failure ◽  
Simultaneous Application ◽  
All Ceramic ◽  
The Mean

  Objectives: This study aimed to assess the effect of application of two types of zirconia primers on repair bond strength of composite to zirconia ceramic. Materials and Methods: In this in vitro, experimental study, 60 zirconia blocks were divided into five groups and subjected to the application of Z-Prime Plus (ZPP), Monobond Plus (MBP), Porcelain Bonding Resin (PBR), ZPP followed by PBR (ZPP+PBR) and MBP followed by PBR (MBP+PBR). They were then bonded to Z100 composite. The samples were then immersed in water at 37°C for 24 hours, thermocycled for 1000 cycles between 5-55°C and subjected to shear bond strength (SBS) test. The mode of failure was determined under a stereomicroscope and a scanning electron microscope (SEM). Results: The mean bond strength was the highest in ZPP+PBR group followed by MBP+PBR, ZPP, PBR and MBP group (22.29±8.86, 15.75±2.81, 12.02±3.24, 3.60±2.92 and 2.92±1.78 MPa, respectively). The effects of type of zirconia primer and use/no use of PBR on SBS were significant (P<0.05). The frequency of adhesive failure in MBP and PBR groups was significantly higher than that in MBP+PBR and ZPP+PBR groups (P<0.05). The cohesive failure was significantly more frequent in ZPP+PBR group than in ZPP, MBP and PBR groups (P<0.05). Conclusion: Simultaneous application of zirconia primer and PBR is the most efficient technique for repair of all-ceramic zirconia restorations with composite resin.

The Competition between Adhesive and Cohesive Fracture at Amicro-Patterned Polymer-Metal Interface

2013 ◽  
Vol 577-578 ◽  
pp. 225-228 ◽  
Author(s):  
Olaf van der Sluis ◽  
Joris J.C. Remmers ◽  
M.A.C. Thurlings ◽  
B.J. Welling ◽  
Sander P.M. Noijen
Keyword(s):  
Crack Deflection ◽  
Surface Roughening ◽  
Adhesive Failure ◽  
Cohesive Failure ◽  
Metal Interface ◽  
Cohesive Fracture ◽  
Micro Patterning ◽  
Polymer Metal ◽  
Metal Interfaces ◽  
Point Bend

It is Common Practice for Polymer-Metal Interfaces, Frequently Encountered in Microelec-Tronic Devices, to Improve Adhesion by Surface Roughening or Micro-Patterning. the Competitionbetween Adhesive Fracture and Cohesive Fracture in the Vicinity of a Patterned Interface, i.e., Inter-Face Crack Deflection, is One of these Key Mechanisms that Contribute Significantly to the Macroscopicadhesion. in this Paper, these Fracture Phenomena are Described Simultaneously by Cohesive Zoneelements with an Exponential Traction-Separation Law (TSL) for the Adhesive Failure and an Initiallyrigid, Exponentially Decaying, TSL for the Cohesive Failure. it is Demonstrated that the Conditions Atwhich Crack Kinking Occurs are Dominated by Fracture Strength Values as Opposed to the Commonlyused Fracture Toughness Values. Experimental Verification is Performed by Means of Four Point Bend-Ing Tests on Specifically Designed Micro-Patterned Polymer-Metal Samples.

Effects of Fatigue Damage on Bond Behavior between Corroded Rebar and Concrete

2019 ◽  
Author(s):  
Yunpeng Zhang ◽  
Weiping Zhang ◽  
You Hu
Keyword(s):  
Bond Strength ◽  
Fatigue Damage ◽  
Current Method ◽  
Fatigue Loading ◽  
Repeated Loading ◽  
Relative Slip ◽  
Pull Out ◽  
Bond Degradation ◽  
Impressed Current ◽  
Different Levels

Bond degradation due to rebar corrosion and fatigue loading may affect the serviceability and even safety of reinforced concrete (RC) bridges. 15 specimens confined with stirrups were cast for eccentric pull-out tests, and 12 of them were corroded with the target mass loss of 0.03 by the impressed current method. Monotonic pull-out tests were conducted on three corroded and three uncorroded specimens. Wavy descending branch was found in bond stress-slip test curves of uncorroded specimens attributed to stirrup confinement, however it disappeared in those curves of the corroded specimens due to the corrosion loss of rebar transverse ribs. Based on the tested monotonic bond strength, the other nine corroded specimens of different fatigue damages were obtained through repeated loading with different levels and cycles before undergoing monotonic pull-out tests. It is observed that the relative slip increases with a gradually decreasing rate as the loading cycles increase. The monotonic tests of specimens with fatigue damage show that the bond strength increases to a certain value and then decreases with the increase of fatigue loading cycles. Moreover, the higher the loading level is, the fewer cycles are needed to reach the maximum bond strength. In addition, the peak slip corresponding to bond strength decreases with the increase of fatigue loading cycles.

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