scholarly journals Reinforcing Method for Shearing Force at the Joint of Steel-Concrete Composite Beam with Pre-Shearing Stress.

1998 ◽  
pp. 63-72
Author(s):  
Suguru Tokumitsu ◽  
Takehiro Yamasaki ◽  
Takashi Idemitsu
Keyword(s):  
Composite Beam ◽  
Shearing Stress ◽  
Shearing Force

The viscosity of a suspension of spheres

1960 ◽  
Vol 7 (2) ◽  
pp. 230-236 ◽  
Author(s):  
A. D. Maude
Keyword(s):  
Shear Flow ◽  
The Other ◽  
Shearing Stress ◽  
Shearing Force ◽  
Velocity Change ◽  
Perturbation Field ◽  
Plane Normal ◽  
Perturbation Velocity ◽  
The Mean

It is shown that in Stokes's flow the perturbation field, due to the addition of one more sphere to a shear flow of a fluid containing a number of non-interacting spheres, has the property that the total additional shearing force, acting on any plane normal to the direction of velocity change, is zero. However, the perturbation velocity, integrated over such a plane, takes a constant value, positive if the plane lies on one side of the sphere and negative if it lies on the other side. It follows that the effect of all the spheres is not to alter the shearing stress at all, but to reduce the mean shear by a factor 1 – 2·5c, where c is the concentration. This suggests that Einstein's viscosity law should be altered to η = η0/(1 – 2·5c) when c is not small.

Bonding strength of a carbon nanofiber array to its substrate

2006 ◽  
Vol 21 (11) ◽  
pp. 2922-2926 ◽  
Author(s):  
Yi Zhang ◽  
Ephraim Suhir ◽  
Yuan Xu ◽  
Claire Gu
Keyword(s):  
Bonding Strength ◽  
Carbon Nanofiber ◽  
Copper Substrate ◽  
Applied Force ◽  
Stress Model ◽  
Shearing Stress ◽  
Shearing Force ◽  
Interface Failure ◽  
Interfacial Shearing Stress

The bonding strength of a carbon nanofiber array (CNFA) grown on a copper substrate is evaluated based on the measured shearing force-at-failure and the developed analytical stress model that enables one to determine the magnitude and the distribution of the interfacial shearing stress causing the measured (given) shearing force. The experiment is conducted using specially designed test specimens. A table version of the Instron tester is used to measure the applied force and the corresponding displacement in shear. The maximum predicted shear-off stress is about 300 psi (0.211 kgf/m2), and was determined, based on the developed stress model, as a product of the measured 5 kgf/m force at the interface failure and the computed parameter k = 0.0422 m–1 of the interfacial shearing stress.

Determination of the transverse shear stress in layered composites

2020 ◽  
Vol 86 (2) ◽  
pp. 44-53
Author(s):  
Yu. I. Dudarkov ◽  
M. V. Limonin
Keyword(s):  
Shear Stress ◽  
Transverse Shear ◽  
Composite Beam ◽  
Layered Composite ◽  
Equivalent Model ◽  
Shear Stresses ◽  
Transverse Shear Stress ◽  
Layered Composites ◽  
Laminate Composites ◽  
Transverse Shear Stresses

An engineering approach to estimation of the transverse shear stresses in layered composites is developed. The technique is based on the well-known D. I. Zhuravsky equation for shear stresses in an isotropic beam upon transverse bending. In general, application of this equation to a composite beam is incorrect due to the heterogeneity of the composite structure. According to the proposed method, at the first stage of its implementation, a transition to the equivalent model of a homogeneous beam is made, for which the Zhuravsky formula is valid. The transition is carried out by changing the shape of the cross section of the beam, provided that the bending stiffness and generalized elastic modulus remain the same. The calculated shear stresses in the equivalent beam are then converted to the stress values in the original composite beam from the equilibrium condition. The main equations and definitions of the method as well as the analytical equation for estimation of the transverse shear stress in a composite beam are presented. The method is verified by comparing the analytical solution and the results of the numerical solution of the problem by finite element method (FEM). It is shown that laminate stacking sequence has a significant impact both on the character and on the value of the transverse shear stress distribution. The limits of the applicability of the developed technique attributed to the conditions of the validity of the hypothesis of straight normal are considered. It is noted that under this hypothesis the shear stresses do not depend on the layer shear modulus, which explains the absence of this parameter in the obtained equation. The classical theory of laminate composites is based on the similar assumptions, which gives ground to use this equation for an approximate estimation of the transverse shear stresses in in a layered composite package.

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