An experimental study of the interfacial fracture behavior of Titanium/CFRP adhesive joints under mode I and mode II fatigue

2020 ◽  
Vol 136 ◽  
pp. 105586 ◽  
Author(s):  
Lucas Adamos ◽  
Panayiotis Tsokanas ◽  
Theodoros Loutas
Keyword(s):  
Experimental Study ◽  
Fracture Behavior ◽  
Interfacial Fracture ◽  
Adhesive Joints ◽  
Mode I ◽  
Mode Ii

An experimental study on interfacial fracture toughness of 3-D printed ABS/CF-PLA composite under mode I, II, and mixed-mode loading

2019 ◽  
pp. 089270571987486 ◽  
Author(s):  
Abdul Samad Khan ◽  
Aaqib Ali ◽  
Ghulam Hussain ◽  
Muhammad Ilyas
Keyword(s):  
Fracture Toughness ◽  
Mixed Mode ◽  
Interfacial Fracture ◽  
Mode I ◽  
Mode Ii ◽  
Interfacial Fracture Toughness ◽  
Fused Deposition ◽  
Specimen Test ◽  
Nozzle Temperature ◽  
Printing Speed

Multimaterial structures made using fused deposition modeling (FDM) offer an attractive prospect for enhancing their mechanical properties and functionality. In this study, the interfacial fracture toughness of a unidirectional hybrid composite fabricated by FDM was studied through mechanical testing. The composite structure comprises acrylonitrile butadiene styrene and carbon fiber-reinforced polylactic acid. Since, de-adhesion or bond failure at the interface can occur under a combination of the different fracture modes, therefore, interfacial fracture toughness, in terms of the critical energy release rate, was characterized using double cantilever beam specimen test for mode I, end-notched flexural specimen test for mode II, and mixed-mode bending specimen test for mixed-mode I/II. Effects of varying process parameters, like printing speed and nozzle temperature, on the interfacial fracture toughness in mode I and II were also investigated. It was found that increasing the nozzle temperature and printing speed enhance the fracture toughness, both in mode I and II, but the effect of increasing nozzle temperature on mode II fracture toughness was quite significant.

scholarly journals Fracture Behavior of Carbon-Epoxy under Different Loading

2020 ◽  
Vol 9 (3) ◽  
pp. 1145-1149
Keyword(s):  
Fracture Surface ◽  
Strain Energy ◽  
Fracture Behavior ◽  
Strain Energy Release Rate ◽  
Strain Energy Release ◽  
Mode I ◽  
Mode Ii ◽  
New Materials ◽  
The Common ◽  
Mode Ii Loading

Delamination is the common failures of composite material attributed to various reasons, most importantly the potential stiffness degradation leading to small flaws and subsequently theypropagate, and it becomes essential to characterize the new materials for interlaminar fracture. For the present study Carbon /epoxy system of IM7/8552 was investigated under mode I and mode II loading. Material was formed into unidirectional laminates with Teflon inserts at its mid length. The specimens were machined according to ASTM standards, Tests were executed on a quasi-static Intron 8225, with load control at 5 mm/ min and 2 m/min for the mode -I and mode-II respectively. The strain energy release rate was found to be GIC=0.266 kJ/m2 and GIIC=0.687 kJ/m2 . Fiberbridging was prominently absent in the DCB samples Examination of the fracture surface by SEM at SAIF, in IIT{M) and the nature of the fracture surface revealed the typical failure mechanism pertaining to mode-I and mode-II failuremechanisms

On Approximately Realizing and Characterizing Pure Mode-I Interface Fracture Between Bonded Dissimilar Materials

2011 ◽  
Vol 78 (3) ◽  
Author(s):  
Zhenyu Ouyang ◽  
Gefu Ji ◽  
Guoqiang Li
Keyword(s):  
Mixed Mode ◽  
Dissimilar Materials ◽  
Interfacial Fracture ◽  
Interface Fracture ◽  
Mode I ◽  
Mode Ii ◽  
Pure Mode ◽  
J Integral ◽  
Mode I Fracture ◽  
Fracture Behaviors

Bimaterial systems in which two dissimilar materials are adhesively joined by a thin adhesive interlayer have been widely used in a variety of modern industries and engineering structures. It is well known that interfacial fracture is the most common failure mode for these bimaterial systems. Particularly, the interface fracture is a mixed mode in nature mode-I (pure peel) and mode-II (pure shear) due to the disrupted symmetry by the bimaterial configuration. Obviously, characterizing individual fracture modes, especially mode-I fracture, is essential in understanding and modeling the complex mixed mode fracture problems. Meanwhile, the J-integral is a highly preferred means to characterize the interfacial fracture behaviors of a bimaterial system because it cannot only capture more accurate toughness value, but also facilitate an experimental characterization of interfacial traction-separation laws (cohesive laws). Motivated by these important issues, a novel idea is proposed in the present work to realize and characterize the pure mode-I nonlinear interface fracture between bonded dissimilar materials. First, a nearly pure mode-I fracture test can be simply realized for a wide range of bimaterial systems by almost eliminating the mode-II component based on a special and simple configuration obtained in this work. Then, the concise forms of the J-integral are derived and used to characterize the interfacial fracture behaviors associated with classical and shear deformation beam theories. The proposed approach may be considered as a promising candidate for the future standard mode-I test method of bimaterial systems due to its obvious accuracy, simplicity, and applicability, as demonstrated by the numerical and experimental results.

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