Coupling resonance mechanism of interfacial fatigue stratification of adhesive and/or welding butt joint structures excited by horizontal shear waves

2021 ◽  
pp. 2150096
Author(s):  
Feng Guo ◽  
Jiu Hui Wu
Keyword(s):  
Resonance Frequency ◽  
Integral Transformation ◽  
Shear Waves ◽  
Excitation Amplitude ◽  
Butt Joint ◽  
Horizontal Shear ◽  
Resonance Mechanism ◽  
Interface Shear ◽  
Interface Shear Stress ◽  
Transformation Methods

Coupling resonance mechanism of interfacial fatigue stratification of adhesive and/or welding butt joint symmetric and/or antisymmetric structures excited by horizontal shear waves are investigated by forced propagation analytical solutions derived by plane wave perturbation methods, integral transformation methods and global matrix methods. The influence of materials on the coupled resonance frequency is analyzed and discussed by the analytical methods. Coupling resonance of interface shear stress is a structure inherent property. Even a very small excitation amplitude at the coupling resonance frequency can result in interface shear delamination. The coupling resonance frequency decreases with the increase of interlayer thickness or shear wave velocity difference between substrate and interlayer. The results could be applied to layered and/or anti-layered structural design.

Coupling resonance effect of interface delamination of laminates excited by horizontal shear wave sources on the surface

2021 ◽  
pp. 2150296
Author(s):  
Feng Guo ◽  
Jiu Hui Wu
Keyword(s):  
Shear Stress ◽  
Shear Wave ◽  
Integral Transformation ◽  
Resonance Effect ◽  
Horizontal Shear ◽  
Interface Shear ◽  
Interface Shear Stress ◽  
Interface Delamination ◽  
Resonance Frequencies ◽  
Transformation Methods

Coupling resonance effect of interface delamination of laminates excited by horizontal shear wave sources on the surface is studied by analytical methods based on forced propagation solutions deduced by surface perturbation methods, integral transformation methods and global-matrix methods. The influence of excitation sources on the interface shear stress is investigated. It is found that coupling resonance frequencies of interface shear stress are intrinsic properties of structures and are independent of excitation sources, at which even a very small perturbation can also lead to the interface stratification. The results provide the theoretical basis for layered and/or anti-layered design of laminates.

scholarly journals Experimental Behavior of Steel-Concrete Composite Girders with UHPC-Grout Strip Shear Connection

Buildings ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 182
Author(s):  
Zhi-Qi He ◽  
Changxue Ou ◽  
Fei Tian ◽  
Zhao Liu
Keyword(s):  
High Performance ◽  
High Performance Concrete ◽  
Fatigue Testing ◽  
Ultimate Capacity ◽  
Horizontal Shear ◽  
Interface Failure ◽  
Interface Shear ◽  
Composite Action ◽  
Shear Connection ◽  
Push Out

This paper develops a new type of shear connection for steel-concrete composite bridges using Ultra-High Performance Concrete (UHPC) as the connection grout. The UHPC-grout strip shear connection is fabricated by preforming a roughened slot in the concrete deck slab, welding an embossed steel rib longitudinally to the upper flange of the steel girder, and casting the strip void between the slot and the steel rib with UHPC grout. The structural performance of the new connection was validated by two sets of experimental tests, including push-out testing of shear connectors and static and fatigue testing of composite beams. The results of push-out testing indicate that the UHPC-grout strip shear connection exhibits a significant improvement of ductility, ultimate capacity, and fatigue performance. The interface shear strength of the UHPC-grout strip connection is beyond 15 MPa, which is about three times that of the strip connection using traditional cementitious grouts. The ultimate capacity of the connection is dominated by the interface failure between the embossed steel and the UHPC grout. The results of composite-beam testing indicate that full composite action is developed between the precast decks and the steel beams, and the composite action remained intact after testing for two million load cycles. Finally, the trail design of a prototype bridge shows that this new connection has the potential to meet the requirements for horizontal shear.

Interface Shear Stress of Concrete Beams Strengthened with FRP in Salt Water

2012 ◽  
Vol 446-449 ◽  
pp. 3499-3502
Author(s):  
Chen Zhao ◽  
Pei Yan Huang ◽  
Zhong Song Chen
Keyword(s):  
Shear Stress ◽  
Concrete Beam ◽  
Salt Water ◽  
Interfacial Shear Stress ◽  
Interfacial Properties ◽  
Interfacial Shear ◽  
Interface Shear ◽  
Interface Shear Stress ◽  
Bond Slip ◽  
Relationship Model

Based on existing methods and results of other research, the bond-slip relationship model is given and the distrubition of shear stress of concrete beam strengthened by FRP in salt water is derived. Through a specific example to analyze the distribution of interfacial shear stress, and the different effects caused by different aggressive environment on the interfacial properties. The results show that: 1) Interfacial shear stress will sharply reduce with increasing distance from the end; 2) Different environments have different effects on the interface properties of FRP strengthened beams. Salt water erosion influnce the interfacial properties of FRP strengthened beams significantly.

Modeling matrix fracture in fiber-reinforced ceramic-matrix composites with different fiber preforms

2019 ◽  
Vol 90 (7-8) ◽  
pp. 909-924 ◽  
Author(s):  
Longbiao Li
Keyword(s):  
Elastic Modulus ◽  
Ceramic Matrix Composites ◽  
Interface Debonding ◽  
Matrix Composites ◽  
Multiple Fracture ◽  
Fiber Volume ◽  
Interface Shear ◽  
Interface Shear Stress ◽  
The Matrix ◽  
Fiber Preforms

In this paper, the stress-dependent matrix multiple fracture in silicon carbide fiber-reinforced ceramic-matrix composites with different fiber preforms is investigated. The critical matrix strain energy criterion is used to determine the matrix multiple fracture considering the interface debonding. The effects of the fiber radius, fiber elastic modulus, matrix elastic modulus, fiber volume, interface shear stress, and interface debonded energy on the matrix multiple fracture and the interface debonding are analyzed. The experimental matrix multiple cracking and interface debonding of minicomposite, unidirectional, and two-dimensional woven SiC/SiC composites with different fiber volumes and interphases are predicted. The matrix cracking density increases with the increasing of the fiber volume, fiber elastic modulus, interface shear stress, and interface debonded energy, and the decreasing of the fiber radius and matrix elastic modulus.

Cut-off frequencies of circumferential horizontal shear waves in various functionally graded cylinder shells

Ultrasonics ◽  
2018 ◽  
Vol 84 ◽  
pp. 180-186 ◽  
Author(s):  
Xiaoqin Shen ◽  
Dawei Ren ◽  
Xiaoshan Cao ◽  
Ji Wang
Keyword(s):  
Shear Waves ◽  
Functionally Graded ◽  
Horizontal Shear

Diffraction of horizontal shear waves by a moving interface crack

1984 ◽  
Vol 54 (1-2) ◽  
pp. 23-34 ◽  
Author(s):  
Y. Nishida ◽  
Y. Shindo ◽  
A. Atsumi
Keyword(s):  
Interface Crack ◽  
Shear Waves ◽  
Horizontal Shear ◽  
Moving Interface

scholarly journals Standing interface stresses as a predictor of walking interface stresses in the trans-tibial prosthesis

2001 ◽  
Vol 25 (1) ◽  
pp. 34-40 ◽  
Author(s):  
S. G. Zachariah ◽  
J. E. Sanders
Keyword(s):  
Sagittal Plane ◽  
Weight Bearing ◽  
Bending Moment ◽  
Full Weight Bearing ◽  
Shear Stresses ◽  
Equal Weight ◽  
Interface Shear ◽  
Interface Shear Stress ◽  
Lateral Region ◽  
Interface Pressures

Interface pressures and shear stresses within the socket, in standing and walking, were measured for two unilateral, male, trans-tibial amputee subjects, during two sessions each. The ratios of equal weight-bearing standing stresses to peak walking stresses showed regional variation, ranging from 0.24:1 for pressure over the anterior region to 1.01:1 for resultant interface shear stress over the lateral region. Interface stresses in standing were only moderate predictors of peak walking stresses. The best correlation coefficient between standing in full weight-bearing and peak walking stress was 0.88 for pressure over the lateral region. As the amputees progressed from minimal to full weight-bearing in standing, and then to walking, the interface stresses increased in a nonlinear fashion, consistent with the assumption that the anterior tibia provides much resistance to the bending moment in the sagittal plane during walking.

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